/* miniz.c v1.15 - public domain deflate/inflate, zlib-subset, ZIP reading/writing/appending, PNG writing See "unlicense" statement at the end of this file. Rich Geldreich , last updated Oct. 13, 2013 Implements RFC 1950: http://www.ietf.org/rfc/rfc1950.txt and RFC 1951: http://www.ietf.org/rfc/rfc1951.txt Most API's defined in miniz.c are optional. This file has only the non-optional parts (which are all that are needed to write pngs) The original was obtained on 2014-01-15 from https://code.google.com/p/miniz/ * Low-level Deflate/Inflate implementation notes: Compression: Use the "tdefl" API's. The compressor supports raw, static, and dynamic blocks, lazy or greedy parsing, match length filtering, RLE-only, and Huffman-only streams. It performs and compresses approximately as well as zlib. Decompression: Use the "tinfl" API's. The entire decompressor is implemented as a single function coroutine: see tinfl_decompress(). It supports decompression into a 32KB (or larger power of 2) wrapping buffer, or into a memory block large enough to hold the entire file. The low-level tdefl/tinfl API's do not make any use of dynamic memory allocation. * PNG writing: See the tdefl_write_image_to_png_file_in_memory() function, originally written by Alex Evans. Supports 1-4 bytes/pixel images. * This is a header file library, like stb_image.c. To get only a header file, either cut and paste the below header, or create miniz.h, #define MINIZ_HEADER_FILE_ONLY, and then include miniz.c from it. * Important: For best perf. be sure to customize the below macros for your target platform: #define MINIZ_USE_UNALIGNED_LOADS_AND_STORES 1 #define MINIZ_LITTLE_ENDIAN 1 #define MINIZ_HAS_64BIT_REGISTERS 1 * On platforms using glibc, Be sure to "#define _LARGEFILE64_SOURCE 1" before including miniz.c to ensure miniz uses the 64-bit variants: fopen64(), stat64(), etc. Otherwise you won't be able to process large files (i.e. 32-bit stat() fails for me on files > 0x7FFFFFFF bytes). */ #ifndef MINIZ_HEADER_INCLUDED #define MINIZ_HEADER_INCLUDED #include #if defined(_M_IX86) || defined(_M_X64) || defined(__i386__) || defined(__i386) || defined(__i486__) || defined(__i486) || defined(i386) || defined(__ia64__) || defined(__x86_64__) // MINIZ_X86_OR_X64_CPU is only used to help set the below macros. #define MINIZ_X86_OR_X64_CPU 1 #endif #if (__BYTE_ORDER__==__ORDER_LITTLE_ENDIAN__) || MINIZ_X86_OR_X64_CPU // Set MINIZ_LITTLE_ENDIAN to 1 if the processor is little endian. #define MINIZ_LITTLE_ENDIAN 1 #endif #if MINIZ_X86_OR_X64_CPU // Set MINIZ_USE_UNALIGNED_LOADS_AND_STORES to 1 on CPU's that permit efficient integer loads and stores from unaligned addresses. #define MINIZ_USE_UNALIGNED_LOADS_AND_STORES 1 #endif #if defined(_M_X64) || defined(_WIN64) || defined(__MINGW64__) || defined(_LP64) || defined(__LP64__) || defined(__ia64__) || defined(__x86_64__) // Set MINIZ_HAS_64BIT_REGISTERS to 1 if operations on 64-bit integers are reasonably fast (and don't involve compiler generated calls to helper functions). #define MINIZ_HAS_64BIT_REGISTERS 1 #endif #ifdef __cplusplus extern "C" { #endif // ------------------- zlib-style API Definitions. // For more compatibility with zlib, miniz.c uses unsigned long for some parameters/struct members. Beware: mz_ulong can be either 32 or 64-bits! typedef unsigned long mz_ulong; // mz_free() internally uses the MZ_FREE() macro (which by default calls free() unless you've modified the MZ_MALLOC macro) to release a block allocated from the heap. void mz_free(void *p); #define MZ_ADLER32_INIT (1) // mz_adler32() returns the initial adler-32 value to use when called with ptr==NULL. mz_ulong mz_adler32(mz_ulong adler, const unsigned char *ptr, size_t buf_len); #define MZ_CRC32_INIT (0) // mz_crc32() returns the initial CRC-32 value to use when called with ptr==NULL. mz_ulong mz_crc32(mz_ulong crc, const unsigned char *ptr, size_t buf_len); // Compression strategies. enum { MZ_DEFAULT_STRATEGY = 0, MZ_FILTERED = 1, MZ_HUFFMAN_ONLY = 2, MZ_RLE = 3, MZ_FIXED = 4 }; // Method #define MZ_DEFLATED 8 // ------------------- Types and macros typedef unsigned char mz_uint8; typedef signed short mz_int16; typedef unsigned short mz_uint16; typedef unsigned int mz_uint32; typedef unsigned int mz_uint; typedef long long mz_int64; typedef unsigned long long mz_uint64; typedef int mz_bool; #define MZ_FALSE (0) #define MZ_TRUE (1) // An attempt to work around MSVC's spammy "warning C4127: conditional expression is constant" message. #ifdef _MSC_VER #define MZ_MACRO_END while (0, 0) #else #define MZ_MACRO_END while (0) #endif // ------------------- ZIP archive reading/writing // ------------------- Low-level Decompression API Definitions // Decompression flags used by tinfl_decompress(). // TINFL_FLAG_PARSE_ZLIB_HEADER: If set, the input has a valid zlib header and ends with an adler32 checksum (it's a valid zlib stream). Otherwise, the input is a raw deflate stream. // TINFL_FLAG_HAS_MORE_INPUT: If set, there are more input bytes available beyond the end of the supplied input buffer. If clear, the input buffer contains all remaining input. // TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF: If set, the output buffer is large enough to hold the entire decompressed stream. If clear, the output buffer is at least the size of the dictionary (typically 32KB). // TINFL_FLAG_COMPUTE_ADLER32: Force adler-32 checksum computation of the decompressed bytes. enum { TINFL_FLAG_PARSE_ZLIB_HEADER = 1, TINFL_FLAG_HAS_MORE_INPUT = 2, TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF = 4, TINFL_FLAG_COMPUTE_ADLER32 = 8 }; // High level decompression functions: // tinfl_decompress_mem_to_heap() decompresses a block in memory to a heap block allocated via malloc(). // On entry: // pSrc_buf, src_buf_len: Pointer and size of the Deflate or zlib source data to decompress. // On return: // Function returns a pointer to the decompressed data, or NULL on failure. // *pOut_len will be set to the decompressed data's size, which could be larger than src_buf_len on uncompressible data. // The caller must call mz_free() on the returned block when it's no longer needed. void *tinfl_decompress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags); // tinfl_decompress_mem_to_mem() decompresses a block in memory to another block in memory. // Returns TINFL_DECOMPRESS_MEM_TO_MEM_FAILED on failure, or the number of bytes written on success. #define TINFL_DECOMPRESS_MEM_TO_MEM_FAILED ((size_t)(-1)) size_t tinfl_decompress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags); // tinfl_decompress_mem_to_callback() decompresses a block in memory to an internal 32KB buffer, and a user provided callback function will be called to flush the buffer. // Returns 1 on success or 0 on failure. typedef int (*tinfl_put_buf_func_ptr)(const void* pBuf, int len, void *pUser); int tinfl_decompress_mem_to_callback(const void *pIn_buf, size_t *pIn_buf_size, tinfl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags); struct tinfl_decompressor_tag; typedef struct tinfl_decompressor_tag tinfl_decompressor; // Max size of LZ dictionary. #define TINFL_LZ_DICT_SIZE 32768 // Return status. typedef enum { TINFL_STATUS_BAD_PARAM = -3, TINFL_STATUS_ADLER32_MISMATCH = -2, TINFL_STATUS_FAILED = -1, TINFL_STATUS_DONE = 0, TINFL_STATUS_NEEDS_MORE_INPUT = 1, TINFL_STATUS_HAS_MORE_OUTPUT = 2 } tinfl_status; // Initializes the decompressor to its initial state. #define tinfl_init(r) do { (r)->m_state = 0; } MZ_MACRO_END #define tinfl_get_adler32(r) (r)->m_check_adler32 // Main low-level decompressor coroutine function. This is the only function actually needed for decompression. All the other functions are just high-level helpers for improved usability. // This is a universal API, i.e. it can be used as a building block to build any desired higher level decompression API. In the limit case, it can be called once per every byte input or output. tinfl_status tinfl_decompress(tinfl_decompressor *r, const mz_uint8 *pIn_buf_next, size_t *pIn_buf_size, mz_uint8 *pOut_buf_start, mz_uint8 *pOut_buf_next, size_t *pOut_buf_size, const mz_uint32 decomp_flags); // Internal/private bits follow. enum { TINFL_MAX_HUFF_TABLES = 3, TINFL_MAX_HUFF_SYMBOLS_0 = 288, TINFL_MAX_HUFF_SYMBOLS_1 = 32, TINFL_MAX_HUFF_SYMBOLS_2 = 19, TINFL_FAST_LOOKUP_BITS = 10, TINFL_FAST_LOOKUP_SIZE = 1 << TINFL_FAST_LOOKUP_BITS }; typedef struct { mz_uint8 m_code_size[TINFL_MAX_HUFF_SYMBOLS_0]; mz_int16 m_look_up[TINFL_FAST_LOOKUP_SIZE], m_tree[TINFL_MAX_HUFF_SYMBOLS_0 * 2]; } tinfl_huff_table; #if MINIZ_HAS_64BIT_REGISTERS #define TINFL_USE_64BIT_BITBUF 1 #endif #if TINFL_USE_64BIT_BITBUF typedef mz_uint64 tinfl_bit_buf_t; #define TINFL_BITBUF_SIZE (64) #else typedef mz_uint32 tinfl_bit_buf_t; #define TINFL_BITBUF_SIZE (32) #endif struct tinfl_decompressor_tag { mz_uint32 m_state, m_num_bits, m_zhdr0, m_zhdr1, m_z_adler32, m_final, m_type, m_check_adler32, m_dist, m_counter, m_num_extra, m_table_sizes[TINFL_MAX_HUFF_TABLES]; tinfl_bit_buf_t m_bit_buf; size_t m_dist_from_out_buf_start; tinfl_huff_table m_tables[TINFL_MAX_HUFF_TABLES]; mz_uint8 m_raw_header[4], m_len_codes[TINFL_MAX_HUFF_SYMBOLS_0 + TINFL_MAX_HUFF_SYMBOLS_1 + 137]; }; // ------------------- Low-level Compression API Definitions // Set TDEFL_LESS_MEMORY to 1 to use less memory (compression will be slightly slower, and raw/dynamic blocks will be output more frequently). #define TDEFL_LESS_MEMORY 0 // tdefl_init() compression flags logically OR'd together (low 12 bits contain the max. number of probes per dictionary search): // TDEFL_DEFAULT_MAX_PROBES: The compressor defaults to 128 dictionary probes per dictionary search. 0=Huffman only, 1=Huffman+LZ (fastest/crap compression), 4095=Huffman+LZ (slowest/best compression). enum { TDEFL_HUFFMAN_ONLY = 0, TDEFL_DEFAULT_MAX_PROBES = 128, TDEFL_MAX_PROBES_MASK = 0xFFF }; // TDEFL_WRITE_ZLIB_HEADER: If set, the compressor outputs a zlib header before the deflate data, and the Adler-32 of the source data at the end. Otherwise, you'll get raw deflate data. // TDEFL_COMPUTE_ADLER32: Always compute the adler-32 of the input data (even when not writing zlib headers). // TDEFL_GREEDY_PARSING_FLAG: Set to use faster greedy parsing, instead of more efficient lazy parsing. // TDEFL_NONDETERMINISTIC_PARSING_FLAG: Enable to decrease the compressor's initialization time to the minimum, but the output may vary from run to run given the same input (depending on the contents of memory). // TDEFL_RLE_MATCHES: Only look for RLE matches (matches with a distance of 1) // TDEFL_FILTER_MATCHES: Discards matches <= 5 chars if enabled. // TDEFL_FORCE_ALL_STATIC_BLOCKS: Disable usage of optimized Huffman tables. // TDEFL_FORCE_ALL_RAW_BLOCKS: Only use raw (uncompressed) deflate blocks. // The low 12 bits are reserved to control the max # of hash probes per dictionary lookup (see TDEFL_MAX_PROBES_MASK). enum { TDEFL_WRITE_ZLIB_HEADER = 0x01000, TDEFL_COMPUTE_ADLER32 = 0x02000, TDEFL_GREEDY_PARSING_FLAG = 0x04000, TDEFL_NONDETERMINISTIC_PARSING_FLAG = 0x08000, TDEFL_RLE_MATCHES = 0x10000, TDEFL_FILTER_MATCHES = 0x20000, TDEFL_FORCE_ALL_STATIC_BLOCKS = 0x40000, TDEFL_FORCE_ALL_RAW_BLOCKS = 0x80000 }; // High level compression functions: // tdefl_compress_mem_to_heap() compresses a block in memory to a heap block allocated via malloc(). // On entry: // pSrc_buf, src_buf_len: Pointer and size of source block to compress. // flags: The max match finder probes (default is 128) logically OR'd against the above flags. Higher probes are slower but improve compression. // On return: // Function returns a pointer to the compressed data, or NULL on failure. // *pOut_len will be set to the compressed data's size, which could be larger than src_buf_len on uncompressible data. // The caller must free() the returned block when it's no longer needed. void *tdefl_compress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags); // tdefl_compress_mem_to_mem() compresses a block in memory to another block in memory. // Returns 0 on failure. size_t tdefl_compress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags); // Compresses an image to a compressed PNG file in memory. // On entry: // pImage, w, h, and num_chans describe the image to compress. num_chans may be 1, 2, 3, or 4. // The image pitch in bytes per scanline will be w*num_chans. The leftmost pixel on the top scanline is stored first in memory. // level may range from [0,10], use MZ_NO_COMPRESSION, MZ_BEST_SPEED, MZ_BEST_COMPRESSION, etc. or a decent default is MZ_DEFAULT_LEVEL // If flip is true, the image will be flipped on the Y axis (useful for OpenGL apps). // On return: // Function returns a pointer to the compressed data, or NULL on failure. // *pLen_out will be set to the size of the PNG image file. // The caller must mz_free() the returned heap block (which will typically be larger than *pLen_out) when it's no longer needed. void *tdefl_write_image_to_png_file_in_memory_ex(const void *pImage, int w, int h, int num_chans, size_t *pLen_out, mz_uint level, mz_bool flip); void *tdefl_write_image_to_png_file_in_memory(const void *pImage, int w, int h, int num_chans, size_t *pLen_out); // Output stream interface. The compressor uses this interface to write compressed data. It'll typically be called TDEFL_OUT_BUF_SIZE at a time. typedef mz_bool (*tdefl_put_buf_func_ptr)(const void* pBuf, int len, void *pUser); // tdefl_compress_mem_to_output() compresses a block to an output stream. The above helpers use this function internally. mz_bool tdefl_compress_mem_to_output(const void *pBuf, size_t buf_len, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags); enum { TDEFL_MAX_HUFF_TABLES = 3, TDEFL_MAX_HUFF_SYMBOLS_0 = 288, TDEFL_MAX_HUFF_SYMBOLS_1 = 32, TDEFL_MAX_HUFF_SYMBOLS_2 = 19, TDEFL_LZ_DICT_SIZE = 32768, TDEFL_LZ_DICT_SIZE_MASK = TDEFL_LZ_DICT_SIZE - 1, TDEFL_MIN_MATCH_LEN = 3, TDEFL_MAX_MATCH_LEN = 258 }; // TDEFL_OUT_BUF_SIZE MUST be large enough to hold a single entire compressed output block (using static/fixed Huffman codes). #if TDEFL_LESS_MEMORY enum { TDEFL_LZ_CODE_BUF_SIZE = 24 * 1024, TDEFL_OUT_BUF_SIZE = (TDEFL_LZ_CODE_BUF_SIZE * 13 ) / 10, TDEFL_MAX_HUFF_SYMBOLS = 288, TDEFL_LZ_HASH_BITS = 12, TDEFL_LEVEL1_HASH_SIZE_MASK = 4095, TDEFL_LZ_HASH_SHIFT = (TDEFL_LZ_HASH_BITS + 2) / 3, TDEFL_LZ_HASH_SIZE = 1 << TDEFL_LZ_HASH_BITS }; #else enum { TDEFL_LZ_CODE_BUF_SIZE = 64 * 1024, TDEFL_OUT_BUF_SIZE = (TDEFL_LZ_CODE_BUF_SIZE * 13 ) / 10, TDEFL_MAX_HUFF_SYMBOLS = 288, TDEFL_LZ_HASH_BITS = 15, TDEFL_LEVEL1_HASH_SIZE_MASK = 4095, TDEFL_LZ_HASH_SHIFT = (TDEFL_LZ_HASH_BITS + 2) / 3, TDEFL_LZ_HASH_SIZE = 1 << TDEFL_LZ_HASH_BITS }; #endif // The low-level tdefl functions below may be used directly if the above helper functions aren't flexible enough. The low-level functions don't make any heap allocations, unlike the above helper functions. typedef enum { TDEFL_STATUS_BAD_PARAM = -2, TDEFL_STATUS_PUT_BUF_FAILED = -1, TDEFL_STATUS_OKAY = 0, TDEFL_STATUS_DONE = 1, } tdefl_status; // Must map to MZ_NO_FLUSH, MZ_SYNC_FLUSH, etc. enums typedef enum { TDEFL_NO_FLUSH = 0, TDEFL_SYNC_FLUSH = 2, TDEFL_FULL_FLUSH = 3, TDEFL_FINISH = 4 } tdefl_flush; // tdefl's compression state structure. typedef struct { tdefl_put_buf_func_ptr m_pPut_buf_func; void *m_pPut_buf_user; mz_uint m_flags, m_max_probes[2]; int m_greedy_parsing; mz_uint m_adler32, m_lookahead_pos, m_lookahead_size, m_dict_size; mz_uint8 *m_pLZ_code_buf, *m_pLZ_flags, *m_pOutput_buf, *m_pOutput_buf_end; mz_uint m_num_flags_left, m_total_lz_bytes, m_lz_code_buf_dict_pos, m_bits_in, m_bit_buffer; mz_uint m_saved_match_dist, m_saved_match_len, m_saved_lit, m_output_flush_ofs, m_output_flush_remaining, m_finished, m_block_index, m_wants_to_finish; tdefl_status m_prev_return_status; const void *m_pIn_buf; void *m_pOut_buf; size_t *m_pIn_buf_size, *m_pOut_buf_size; tdefl_flush m_flush; const mz_uint8 *m_pSrc; size_t m_src_buf_left, m_out_buf_ofs; mz_uint8 m_dict[TDEFL_LZ_DICT_SIZE + TDEFL_MAX_MATCH_LEN - 1]; mz_uint16 m_huff_count[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS]; mz_uint16 m_huff_codes[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS]; mz_uint8 m_huff_code_sizes[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS]; mz_uint8 m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE]; mz_uint16 m_next[TDEFL_LZ_DICT_SIZE]; mz_uint16 m_hash[TDEFL_LZ_HASH_SIZE]; mz_uint8 m_output_buf[TDEFL_OUT_BUF_SIZE]; } tdefl_compressor; // Initializes the compressor. // There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory. // pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression. // If pBut_buf_func is NULL the user should always call the tdefl_compress() API. // flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.) tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags); // Compresses a block of data, consuming as much of the specified input buffer as possible, and writing as much compressed data to the specified output buffer as possible. tdefl_status tdefl_compress(tdefl_compressor *d, const void *pIn_buf, size_t *pIn_buf_size, void *pOut_buf, size_t *pOut_buf_size, tdefl_flush flush); // tdefl_compress_buffer() is only usable when the tdefl_init() is called with a non-NULL tdefl_put_buf_func_ptr. // tdefl_compress_buffer() always consumes the entire input buffer. tdefl_status tdefl_compress_buffer(tdefl_compressor *d, const void *pIn_buf, size_t in_buf_size, tdefl_flush flush); tdefl_status tdefl_get_prev_return_status(tdefl_compressor *d); mz_uint32 tdefl_get_adler32(tdefl_compressor *d); // Can't use tdefl_create_comp_flags_from_zip_params if MINIZ_NO_ZLIB_APIS isn't defined, because it uses some of its macros. #ifndef MINIZ_NO_ZLIB_APIS // Create tdefl_compress() flags given zlib-style compression parameters. // level may range from [0,10] (where 10 is absolute max compression, but may be much slower on some files) // window_bits may be -15 (raw deflate) or 15 (zlib) // strategy may be either MZ_DEFAULT_STRATEGY, MZ_FILTERED, MZ_HUFFMAN_ONLY, MZ_RLE, or MZ_FIXED mz_uint tdefl_create_comp_flags_from_zip_params(int level, int window_bits, int strategy); #endif // #ifndef MINIZ_NO_ZLIB_APIS #ifdef __cplusplus } #endif #endif // MINIZ_HEADER_INCLUDED // ------------------- End of Header: Implementation follows. (If you only want the header, define MINIZ_HEADER_FILE_ONLY.) #ifndef MINIZ_HEADER_FILE_ONLY typedef unsigned char mz_validate_uint16[sizeof(mz_uint16)==2 ? 1 : -1]; typedef unsigned char mz_validate_uint32[sizeof(mz_uint32)==4 ? 1 : -1]; typedef unsigned char mz_validate_uint64[sizeof(mz_uint64)==8 ? 1 : -1]; #include #include #define MZ_ASSERT(x) assert(x) #ifdef MINIZ_NO_MALLOC #define MZ_MALLOC(x) NULL #define MZ_FREE(x) (void)x, ((void)0) #define MZ_REALLOC(p, x) NULL #else #define MZ_MALLOC(x) malloc(x) #define MZ_FREE(x) free(x) #define MZ_REALLOC(p, x) realloc(p, x) #endif #define MZ_MAX(a,b) (((a)>(b))?(a):(b)) #define MZ_MIN(a,b) (((a)<(b))?(a):(b)) #define MZ_CLEAR_OBJ(obj) memset(&(obj), 0, sizeof(obj)) #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN #define MZ_READ_LE16(p) *((const mz_uint16 *)(p)) #define MZ_READ_LE32(p) *((const mz_uint32 *)(p)) #else #define MZ_READ_LE16(p) ((mz_uint32)(((const mz_uint8 *)(p))[0]) | ((mz_uint32)(((const mz_uint8 *)(p))[1]) << 8U)) #define MZ_READ_LE32(p) ((mz_uint32)(((const mz_uint8 *)(p))[0]) | ((mz_uint32)(((const mz_uint8 *)(p))[1]) << 8U) | ((mz_uint32)(((const mz_uint8 *)(p))[2]) << 16U) | ((mz_uint32)(((const mz_uint8 *)(p))[3]) << 24U)) #endif #ifdef _MSC_VER #define MZ_FORCEINLINE __forceinline #elif defined(__GNUC__) #define MZ_FORCEINLINE inline __attribute__((__always_inline__)) #else #define MZ_FORCEINLINE inline #endif #ifdef __cplusplus extern "C" { #endif // ------------------- zlib-style API's mz_ulong mz_adler32(mz_ulong adler, const unsigned char *ptr, size_t buf_len) { mz_uint32 i, s1 = (mz_uint32)(adler & 0xffff), s2 = (mz_uint32)(adler >> 16); size_t block_len = buf_len % 5552; if (!ptr) return MZ_ADLER32_INIT; while (buf_len) { for (i = 0; i + 7 < block_len; i += 8, ptr += 8) { s1 += ptr[0], s2 += s1; s1 += ptr[1], s2 += s1; s1 += ptr[2], s2 += s1; s1 += ptr[3], s2 += s1; s1 += ptr[4], s2 += s1; s1 += ptr[5], s2 += s1; s1 += ptr[6], s2 += s1; s1 += ptr[7], s2 += s1; } for ( ; i < block_len; ++i) s1 += *ptr++, s2 += s1; s1 %= 65521U, s2 %= 65521U; buf_len -= block_len; block_len = 5552; } return (s2 << 16) + s1; } // Karl Malbrain's compact CRC-32. See "A compact CCITT crc16 and crc32 C implementation that balances processor cache usage against speed": http://www.geocities.com/malbrain/ mz_ulong mz_crc32(mz_ulong crc, const mz_uint8 *ptr, size_t buf_len) { static const mz_uint32 s_crc32[16] = { 0, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c }; mz_uint32 crcu32 = (mz_uint32)crc; if (!ptr) return MZ_CRC32_INIT; crcu32 = ~crcu32; while (buf_len--) { mz_uint8 b = *ptr++; crcu32 = (crcu32 >> 4) ^ s_crc32[(crcu32 & 0xF) ^ (b & 0xF)]; crcu32 = (crcu32 >> 4) ^ s_crc32[(crcu32 & 0xF) ^ (b >> 4)]; } return ~crcu32; } void mz_free(void *p) { MZ_FREE(p); } // ------------------- Low-level Decompression (completely independent from all compression API's) #define TINFL_MEMCPY(d, s, l) memcpy(d, s, l) #define TINFL_MEMSET(p, c, l) memset(p, c, l) #define TINFL_CR_BEGIN switch(r->m_state) { case 0: #define TINFL_CR_RETURN(state_index, result) do { status = result; r->m_state = state_index; goto common_exit; case state_index:; } MZ_MACRO_END #define TINFL_CR_RETURN_FOREVER(state_index, result) do { for ( ; ; ) { TINFL_CR_RETURN(state_index, result); } } MZ_MACRO_END #define TINFL_CR_FINISH } // TODO: If the caller has indicated that there's no more input, and we attempt to read beyond the input buf, then something is wrong with the input because the inflator never // reads ahead more than it needs to. Currently TINFL_GET_BYTE() pads the end of the stream with 0's in this scenario. #define TINFL_GET_BYTE(state_index, c) do { \ if (pIn_buf_cur >= pIn_buf_end) { \ for ( ; ; ) { \ if (decomp_flags & TINFL_FLAG_HAS_MORE_INPUT) { \ TINFL_CR_RETURN(state_index, TINFL_STATUS_NEEDS_MORE_INPUT); \ if (pIn_buf_cur < pIn_buf_end) { \ c = *pIn_buf_cur++; \ break; \ } \ } else { \ c = 0; \ break; \ } \ } \ } else c = *pIn_buf_cur++; } MZ_MACRO_END #define TINFL_NEED_BITS(state_index, n) do { mz_uint c; TINFL_GET_BYTE(state_index, c); bit_buf |= (((tinfl_bit_buf_t)c) << num_bits); num_bits += 8; } while (num_bits < (mz_uint)(n)) #define TINFL_SKIP_BITS(state_index, n) do { if (num_bits < (mz_uint)(n)) { TINFL_NEED_BITS(state_index, n); } bit_buf >>= (n); num_bits -= (n); } MZ_MACRO_END #define TINFL_GET_BITS(state_index, b, n) do { if (num_bits < (mz_uint)(n)) { TINFL_NEED_BITS(state_index, n); } b = bit_buf & ((1 << (n)) - 1); bit_buf >>= (n); num_bits -= (n); } MZ_MACRO_END // TINFL_HUFF_BITBUF_FILL() is only used rarely, when the number of bytes remaining in the input buffer falls below 2. // It reads just enough bytes from the input stream that are needed to decode the next Huffman code (and absolutely no more). It works by trying to fully decode a // Huffman code by using whatever bits are currently present in the bit buffer. If this fails, it reads another byte, and tries again until it succeeds or until the // bit buffer contains >=15 bits (deflate's max. Huffman code size). #define TINFL_HUFF_BITBUF_FILL(state_index, pHuff) \ do { \ temp = (pHuff)->m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]; \ if (temp >= 0) { \ code_len = temp >> 9; \ if ((code_len) && (num_bits >= code_len)) \ break; \ } else if (num_bits > TINFL_FAST_LOOKUP_BITS) { \ code_len = TINFL_FAST_LOOKUP_BITS; \ do { \ temp = (pHuff)->m_tree[~temp + ((bit_buf >> code_len++) & 1)]; \ } while ((temp < 0) && (num_bits >= (code_len + 1))); if (temp >= 0) break; \ } TINFL_GET_BYTE(state_index, c); bit_buf |= (((tinfl_bit_buf_t)c) << num_bits); num_bits += 8; \ } while (num_bits < 15); // TINFL_HUFF_DECODE() decodes the next Huffman coded symbol. It's more complex than you would initially expect because the zlib API expects the decompressor to never read // beyond the final byte of the deflate stream. (In other words, when this macro wants to read another byte from the input, it REALLY needs another byte in order to fully // decode the next Huffman code.) Handling this properly is particularly important on raw deflate (non-zlib) streams, which aren't followed by a byte aligned adler-32. // The slow path is only executed at the very end of the input buffer. #define TINFL_HUFF_DECODE(state_index, sym, pHuff) do { \ int temp; mz_uint code_len, c; \ if (num_bits < 15) { \ if ((pIn_buf_end - pIn_buf_cur) < 2) { \ TINFL_HUFF_BITBUF_FILL(state_index, pHuff); \ } else { \ bit_buf |= (((tinfl_bit_buf_t)pIn_buf_cur[0]) << num_bits) | (((tinfl_bit_buf_t)pIn_buf_cur[1]) << (num_bits + 8)); pIn_buf_cur += 2; num_bits += 16; \ } \ } \ if ((temp = (pHuff)->m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0) \ code_len = temp >> 9, temp &= 511; \ else { \ code_len = TINFL_FAST_LOOKUP_BITS; do { temp = (pHuff)->m_tree[~temp + ((bit_buf >> code_len++) & 1)]; } while (temp < 0); \ } sym = temp; bit_buf >>= code_len; num_bits -= code_len; } MZ_MACRO_END tinfl_status tinfl_decompress(tinfl_decompressor *r, const mz_uint8 *pIn_buf_next, size_t *pIn_buf_size, mz_uint8 *pOut_buf_start, mz_uint8 *pOut_buf_next, size_t *pOut_buf_size, const mz_uint32 decomp_flags) { static const int s_length_base[31] = { 3,4,5,6,7,8,9,10,11,13, 15,17,19,23,27,31,35,43,51,59, 67,83,99,115,131,163,195,227,258,0,0 }; static const int s_length_extra[31]= { 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; static const int s_dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, 257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; static const int s_dist_extra[32] = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; static const mz_uint8 s_length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; static const int s_min_table_sizes[3] = { 257, 1, 4 }; tinfl_status status = TINFL_STATUS_FAILED; mz_uint32 num_bits, dist, counter, num_extra; tinfl_bit_buf_t bit_buf; const mz_uint8 *pIn_buf_cur = pIn_buf_next, *const pIn_buf_end = pIn_buf_next + *pIn_buf_size; mz_uint8 *pOut_buf_cur = pOut_buf_next, *const pOut_buf_end = pOut_buf_next + *pOut_buf_size; size_t out_buf_size_mask = (decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF) ? (size_t)-1 : ((pOut_buf_next - pOut_buf_start) + *pOut_buf_size) - 1, dist_from_out_buf_start; // Ensure the output buffer's size is a power of 2, unless the output buffer is large enough to hold the entire output file (in which case it doesn't matter). if (((out_buf_size_mask + 1) & out_buf_size_mask) || (pOut_buf_next < pOut_buf_start)) { *pIn_buf_size = *pOut_buf_size = 0; return TINFL_STATUS_BAD_PARAM; } num_bits = r->m_num_bits; bit_buf = r->m_bit_buf; dist = r->m_dist; counter = r->m_counter; num_extra = r->m_num_extra; dist_from_out_buf_start = r->m_dist_from_out_buf_start; TINFL_CR_BEGIN bit_buf = num_bits = dist = counter = num_extra = r->m_zhdr0 = r->m_zhdr1 = 0; r->m_z_adler32 = r->m_check_adler32 = 1; if (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER) { TINFL_GET_BYTE(1, r->m_zhdr0); TINFL_GET_BYTE(2, r->m_zhdr1); counter = (((r->m_zhdr0 * 256 + r->m_zhdr1) % 31 != 0) || (r->m_zhdr1 & 32) || ((r->m_zhdr0 & 15) != 8)); if (!(decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF)) counter |= (((1U << (8U + (r->m_zhdr0 >> 4))) > 32768U) || ((out_buf_size_mask + 1) < (size_t)(1U << (8U + (r->m_zhdr0 >> 4))))); if (counter) { TINFL_CR_RETURN_FOREVER(36, TINFL_STATUS_FAILED); } } do { TINFL_GET_BITS(3, r->m_final, 3); r->m_type = r->m_final >> 1; if (r->m_type == 0) { TINFL_SKIP_BITS(5, num_bits & 7); for (counter = 0; counter < 4; ++counter) { if (num_bits) TINFL_GET_BITS(6, r->m_raw_header[counter], 8); else TINFL_GET_BYTE(7, r->m_raw_header[counter]); } if ((counter = (r->m_raw_header[0] | (r->m_raw_header[1] << 8))) != (mz_uint)(0xFFFF ^ (r->m_raw_header[2] | (r->m_raw_header[3] << 8)))) { TINFL_CR_RETURN_FOREVER(39, TINFL_STATUS_FAILED); } while ((counter) && (num_bits)) { TINFL_GET_BITS(51, dist, 8); while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(52, TINFL_STATUS_HAS_MORE_OUTPUT); } *pOut_buf_cur++ = (mz_uint8)dist; counter--; } while (counter) { size_t n; while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(9, TINFL_STATUS_HAS_MORE_OUTPUT); } while (pIn_buf_cur >= pIn_buf_end) { if (decomp_flags & TINFL_FLAG_HAS_MORE_INPUT) { TINFL_CR_RETURN(38, TINFL_STATUS_NEEDS_MORE_INPUT); } else { TINFL_CR_RETURN_FOREVER(40, TINFL_STATUS_FAILED); } } n = MZ_MIN(MZ_MIN((size_t)(pOut_buf_end - pOut_buf_cur), (size_t)(pIn_buf_end - pIn_buf_cur)), counter); TINFL_MEMCPY(pOut_buf_cur, pIn_buf_cur, n); pIn_buf_cur += n; pOut_buf_cur += n; counter -= (mz_uint)n; } } else if (r->m_type == 3) { TINFL_CR_RETURN_FOREVER(10, TINFL_STATUS_FAILED); } else { if (r->m_type == 1) { mz_uint8 *p = r->m_tables[0].m_code_size; mz_uint i; r->m_table_sizes[0] = 288; r->m_table_sizes[1] = 32; TINFL_MEMSET(r->m_tables[1].m_code_size, 5, 32); for ( i = 0; i <= 143; ++i) *p++ = 8; for ( ; i <= 255; ++i) *p++ = 9; for ( ; i <= 279; ++i) *p++ = 7; for ( ; i <= 287; ++i) *p++ = 8; } else { for (counter = 0; counter < 3; counter++) { TINFL_GET_BITS(11, r->m_table_sizes[counter], "\05\05\04"[counter]); r->m_table_sizes[counter] += s_min_table_sizes[counter]; } MZ_CLEAR_OBJ(r->m_tables[2].m_code_size); for (counter = 0; counter < r->m_table_sizes[2]; counter++) { mz_uint s; TINFL_GET_BITS(14, s, 3); r->m_tables[2].m_code_size[s_length_dezigzag[counter]] = (mz_uint8)s; } r->m_table_sizes[2] = 19; } for ( ; (int)r->m_type >= 0; r->m_type--) { int tree_next, tree_cur; tinfl_huff_table *pTable; mz_uint i, j, used_syms, total, sym_index, next_code[17], total_syms[16]; pTable = &r->m_tables[r->m_type]; MZ_CLEAR_OBJ(total_syms); MZ_CLEAR_OBJ(pTable->m_look_up); MZ_CLEAR_OBJ(pTable->m_tree); for (i = 0; i < r->m_table_sizes[r->m_type]; ++i) total_syms[pTable->m_code_size[i]]++; used_syms = 0, total = 0; next_code[0] = next_code[1] = 0; for (i = 1; i <= 15; ++i) { used_syms += total_syms[i]; next_code[i + 1] = (total = ((total + total_syms[i]) << 1)); } if ((65536 != total) && (used_syms > 1)) { TINFL_CR_RETURN_FOREVER(35, TINFL_STATUS_FAILED); } for (tree_next = -1, sym_index = 0; sym_index < r->m_table_sizes[r->m_type]; ++sym_index) { mz_uint rev_code = 0, l, cur_code, code_size = pTable->m_code_size[sym_index]; if (!code_size) continue; cur_code = next_code[code_size]++; for (l = code_size; l > 0; l--, cur_code >>= 1) rev_code = (rev_code << 1) | (cur_code & 1); if (code_size <= TINFL_FAST_LOOKUP_BITS) { mz_int16 k = (mz_int16)((code_size << 9) | sym_index); while (rev_code < TINFL_FAST_LOOKUP_SIZE) { pTable->m_look_up[rev_code] = k; rev_code += (1 << code_size); } continue; } if (0 == (tree_cur = pTable->m_look_up[rev_code & (TINFL_FAST_LOOKUP_SIZE - 1)])) { pTable->m_look_up[rev_code & (TINFL_FAST_LOOKUP_SIZE - 1)] = (mz_int16)tree_next; tree_cur = tree_next; tree_next -= 2; } rev_code >>= (TINFL_FAST_LOOKUP_BITS - 1); for (j = code_size; j > (TINFL_FAST_LOOKUP_BITS + 1); j--) { tree_cur -= ((rev_code >>= 1) & 1); if (!pTable->m_tree[-tree_cur - 1]) { pTable->m_tree[-tree_cur - 1] = (mz_int16)tree_next; tree_cur = tree_next; tree_next -= 2; } else tree_cur = pTable->m_tree[-tree_cur - 1]; } tree_cur -= ((rev_code >>= 1) & 1); pTable->m_tree[-tree_cur - 1] = (mz_int16)sym_index; } if (r->m_type == 2) { for (counter = 0; counter < (r->m_table_sizes[0] + r->m_table_sizes[1]); ) { mz_uint s; TINFL_HUFF_DECODE(16, dist, &r->m_tables[2]); if (dist < 16) { r->m_len_codes[counter++] = (mz_uint8)dist; continue; } if ((dist == 16) && (!counter)) { TINFL_CR_RETURN_FOREVER(17, TINFL_STATUS_FAILED); } num_extra = "\02\03\07"[dist - 16]; TINFL_GET_BITS(18, s, num_extra); s += "\03\03\013"[dist - 16]; TINFL_MEMSET(r->m_len_codes + counter, (dist == 16) ? r->m_len_codes[counter - 1] : 0, s); counter += s; } if ((r->m_table_sizes[0] + r->m_table_sizes[1]) != counter) { TINFL_CR_RETURN_FOREVER(21, TINFL_STATUS_FAILED); } TINFL_MEMCPY(r->m_tables[0].m_code_size, r->m_len_codes, r->m_table_sizes[0]); TINFL_MEMCPY(r->m_tables[1].m_code_size, r->m_len_codes + r->m_table_sizes[0], r->m_table_sizes[1]); } } for ( ; ; ) { mz_uint8 *pSrc; for ( ; ; ) { if (((pIn_buf_end - pIn_buf_cur) < 4) || ((pOut_buf_end - pOut_buf_cur) < 2)) { TINFL_HUFF_DECODE(23, counter, &r->m_tables[0]); if (counter >= 256) break; while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(24, TINFL_STATUS_HAS_MORE_OUTPUT); } *pOut_buf_cur++ = (mz_uint8)counter; } else { int sym2; mz_uint code_len; #if TINFL_USE_64BIT_BITBUF if (num_bits < 30) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE32(pIn_buf_cur)) << num_bits); pIn_buf_cur += 4; num_bits += 32; } #else if (num_bits < 15) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE16(pIn_buf_cur)) << num_bits); pIn_buf_cur += 2; num_bits += 16; } #endif if ((sym2 = r->m_tables[0].m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0) code_len = sym2 >> 9; else { code_len = TINFL_FAST_LOOKUP_BITS; do { sym2 = r->m_tables[0].m_tree[~sym2 + ((bit_buf >> code_len++) & 1)]; } while (sym2 < 0); } counter = sym2; bit_buf >>= code_len; num_bits -= code_len; if (counter & 256) break; #if !TINFL_USE_64BIT_BITBUF if (num_bits < 15) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE16(pIn_buf_cur)) << num_bits); pIn_buf_cur += 2; num_bits += 16; } #endif if ((sym2 = r->m_tables[0].m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0) code_len = sym2 >> 9; else { code_len = TINFL_FAST_LOOKUP_BITS; do { sym2 = r->m_tables[0].m_tree[~sym2 + ((bit_buf >> code_len++) & 1)]; } while (sym2 < 0); } bit_buf >>= code_len; num_bits -= code_len; pOut_buf_cur[0] = (mz_uint8)counter; if (sym2 & 256) { pOut_buf_cur++; counter = sym2; break; } pOut_buf_cur[1] = (mz_uint8)sym2; pOut_buf_cur += 2; } } if ((counter &= 511) == 256) break; num_extra = s_length_extra[counter - 257]; counter = s_length_base[counter - 257]; if (num_extra) { mz_uint extra_bits; TINFL_GET_BITS(25, extra_bits, num_extra); counter += extra_bits; } TINFL_HUFF_DECODE(26, dist, &r->m_tables[1]); num_extra = s_dist_extra[dist]; dist = s_dist_base[dist]; if (num_extra) { mz_uint extra_bits; TINFL_GET_BITS(27, extra_bits, num_extra); dist += extra_bits; } dist_from_out_buf_start = pOut_buf_cur - pOut_buf_start; if ((dist > dist_from_out_buf_start) && (decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF)) { TINFL_CR_RETURN_FOREVER(37, TINFL_STATUS_FAILED); } pSrc = pOut_buf_start + ((dist_from_out_buf_start - dist) & out_buf_size_mask); if ((MZ_MAX(pOut_buf_cur, pSrc) + counter) > pOut_buf_end) { while (counter--) { while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(53, TINFL_STATUS_HAS_MORE_OUTPUT); } *pOut_buf_cur++ = pOut_buf_start[(dist_from_out_buf_start++ - dist) & out_buf_size_mask]; } continue; } #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES else if ((counter >= 9) && (counter <= dist)) { const mz_uint8 *pSrc_end = pSrc + (counter & ~7); do { ((mz_uint32 *)pOut_buf_cur)[0] = ((const mz_uint32 *)pSrc)[0]; ((mz_uint32 *)pOut_buf_cur)[1] = ((const mz_uint32 *)pSrc)[1]; pOut_buf_cur += 8; } while ((pSrc += 8) < pSrc_end); if ((counter &= 7) < 3) { if (counter) { pOut_buf_cur[0] = pSrc[0]; if (counter > 1) pOut_buf_cur[1] = pSrc[1]; pOut_buf_cur += counter; } continue; } } #endif do { pOut_buf_cur[0] = pSrc[0]; pOut_buf_cur[1] = pSrc[1]; pOut_buf_cur[2] = pSrc[2]; pOut_buf_cur += 3; pSrc += 3; } while ((int)(counter -= 3) > 2); if ((int)counter > 0) { pOut_buf_cur[0] = pSrc[0]; if ((int)counter > 1) pOut_buf_cur[1] = pSrc[1]; pOut_buf_cur += counter; } } } } while (!(r->m_final & 1)); if (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER) { TINFL_SKIP_BITS(32, num_bits & 7); for (counter = 0; counter < 4; ++counter) { mz_uint s; if (num_bits) TINFL_GET_BITS(41, s, 8); else TINFL_GET_BYTE(42, s); r->m_z_adler32 = (r->m_z_adler32 << 8) | s; } } TINFL_CR_RETURN_FOREVER(34, TINFL_STATUS_DONE); TINFL_CR_FINISH common_exit: r->m_num_bits = num_bits; r->m_bit_buf = bit_buf; r->m_dist = dist; r->m_counter = counter; r->m_num_extra = num_extra; r->m_dist_from_out_buf_start = dist_from_out_buf_start; *pIn_buf_size = pIn_buf_cur - pIn_buf_next; *pOut_buf_size = pOut_buf_cur - pOut_buf_next; if ((decomp_flags & (TINFL_FLAG_PARSE_ZLIB_HEADER | TINFL_FLAG_COMPUTE_ADLER32)) && (status >= 0)) { const mz_uint8 *ptr = pOut_buf_next; size_t buf_len = *pOut_buf_size; mz_uint32 i, s1 = r->m_check_adler32 & 0xffff, s2 = r->m_check_adler32 >> 16; size_t block_len = buf_len % 5552; while (buf_len) { for (i = 0; i + 7 < block_len; i += 8, ptr += 8) { s1 += ptr[0], s2 += s1; s1 += ptr[1], s2 += s1; s1 += ptr[2], s2 += s1; s1 += ptr[3], s2 += s1; s1 += ptr[4], s2 += s1; s1 += ptr[5], s2 += s1; s1 += ptr[6], s2 += s1; s1 += ptr[7], s2 += s1; } for ( ; i < block_len; ++i) s1 += *ptr++, s2 += s1; s1 %= 65521U, s2 %= 65521U; buf_len -= block_len; block_len = 5552; } r->m_check_adler32 = (s2 << 16) + s1; if ((status == TINFL_STATUS_DONE) && (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER) && (r->m_check_adler32 != r->m_z_adler32)) status = TINFL_STATUS_ADLER32_MISMATCH; } return status; } // Higher level helper functions. void *tinfl_decompress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags) { tinfl_decompressor decomp; void *pBuf = NULL, *pNew_buf; size_t src_buf_ofs = 0, out_buf_capacity = 0; *pOut_len = 0; tinfl_init(&decomp); for ( ; ; ) { size_t src_buf_size = src_buf_len - src_buf_ofs, dst_buf_size = out_buf_capacity - *pOut_len, new_out_buf_capacity; tinfl_status status = tinfl_decompress(&decomp, (const mz_uint8*)pSrc_buf + src_buf_ofs, &src_buf_size, (mz_uint8*)pBuf, pBuf ? (mz_uint8*)pBuf + *pOut_len : NULL, &dst_buf_size, (flags & ~TINFL_FLAG_HAS_MORE_INPUT) | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF); if ((status < 0) || (status == TINFL_STATUS_NEEDS_MORE_INPUT)) { MZ_FREE(pBuf); *pOut_len = 0; return NULL; } src_buf_ofs += src_buf_size; *pOut_len += dst_buf_size; if (status == TINFL_STATUS_DONE) break; new_out_buf_capacity = out_buf_capacity * 2; if (new_out_buf_capacity < 128) new_out_buf_capacity = 128; pNew_buf = MZ_REALLOC(pBuf, new_out_buf_capacity); if (!pNew_buf) { MZ_FREE(pBuf); *pOut_len = 0; return NULL; } pBuf = pNew_buf; out_buf_capacity = new_out_buf_capacity; } return pBuf; } size_t tinfl_decompress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags) { tinfl_decompressor decomp; tinfl_status status; tinfl_init(&decomp); status = tinfl_decompress(&decomp, (const mz_uint8*)pSrc_buf, &src_buf_len, (mz_uint8*)pOut_buf, (mz_uint8*)pOut_buf, &out_buf_len, (flags & ~TINFL_FLAG_HAS_MORE_INPUT) | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF); return (status != TINFL_STATUS_DONE) ? TINFL_DECOMPRESS_MEM_TO_MEM_FAILED : out_buf_len; } int tinfl_decompress_mem_to_callback(const void *pIn_buf, size_t *pIn_buf_size, tinfl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags) { int result = 0; tinfl_decompressor decomp; mz_uint8 *pDict = (mz_uint8*)MZ_MALLOC(TINFL_LZ_DICT_SIZE); size_t in_buf_ofs = 0, dict_ofs = 0; if (!pDict) return TINFL_STATUS_FAILED; tinfl_init(&decomp); for ( ; ; ) { size_t in_buf_size = *pIn_buf_size - in_buf_ofs, dst_buf_size = TINFL_LZ_DICT_SIZE - dict_ofs; tinfl_status status = tinfl_decompress(&decomp, (const mz_uint8*)pIn_buf + in_buf_ofs, &in_buf_size, pDict, pDict + dict_ofs, &dst_buf_size, (flags & ~(TINFL_FLAG_HAS_MORE_INPUT | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF))); in_buf_ofs += in_buf_size; if ((dst_buf_size) && (!(*pPut_buf_func)(pDict + dict_ofs, (int)dst_buf_size, pPut_buf_user))) break; if (status != TINFL_STATUS_HAS_MORE_OUTPUT) { result = (status == TINFL_STATUS_DONE); break; } dict_ofs = (dict_ofs + dst_buf_size) & (TINFL_LZ_DICT_SIZE - 1); } MZ_FREE(pDict); *pIn_buf_size = in_buf_ofs; return result; } // ------------------- Low-level Compression (independent from all decompression API's) // Purposely making these tables static for faster init and thread safety. static const mz_uint16 s_tdefl_len_sym[256] = { 257,258,259,260,261,262,263,264,265,265,266,266,267,267,268,268,269,269,269,269,270,270,270,270,271,271,271,271,272,272,272,272, 273,273,273,273,273,273,273,273,274,274,274,274,274,274,274,274,275,275,275,275,275,275,275,275,276,276,276,276,276,276,276,276, 277,277,277,277,277,277,277,277,277,277,277,277,277,277,277,277,278,278,278,278,278,278,278,278,278,278,278,278,278,278,278,278, 279,279,279,279,279,279,279,279,279,279,279,279,279,279,279,279,280,280,280,280,280,280,280,280,280,280,280,280,280,280,280,280, 281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281, 282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282, 283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283, 284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,285 }; static const mz_uint8 s_tdefl_len_extra[256] = { 0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,0 }; static const mz_uint8 s_tdefl_small_dist_sym[512] = { 0,1,2,3,4,4,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11, 11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13, 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14, 14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14, 14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,16,16,16,16,16,16,16,16,16,16,16,16,16, 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,17,17,17,17,17,17, 17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17, 17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17, 17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17 }; static const mz_uint8 s_tdefl_small_dist_extra[512] = { 0,0,0,0,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5, 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7 }; static const mz_uint8 s_tdefl_large_dist_sym[128] = { 0,0,18,19,20,20,21,21,22,22,22,22,23,23,23,23,24,24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,26,26,26,26, 26,26,26,26,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28, 28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29 }; static const mz_uint8 s_tdefl_large_dist_extra[128] = { 0,0,8,8,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12, 12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13, 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13 }; // Radix sorts tdefl_sym_freq[] array by 16-bit key m_key. Returns ptr to sorted values. typedef struct { mz_uint16 m_key, m_sym_index; } tdefl_sym_freq; static tdefl_sym_freq* tdefl_radix_sort_syms(mz_uint num_syms, tdefl_sym_freq* pSyms0, tdefl_sym_freq* pSyms1) { mz_uint32 total_passes = 2, pass_shift, pass, i, hist[256 * 2]; tdefl_sym_freq* pCur_syms = pSyms0, *pNew_syms = pSyms1; MZ_CLEAR_OBJ(hist); for (i = 0; i < num_syms; i++) { mz_uint freq = pSyms0[i].m_key; hist[freq & 0xFF]++; hist[256 + ((freq >> 8) & 0xFF)]++; } while ((total_passes > 1) && (num_syms == hist[(total_passes - 1) * 256])) total_passes--; for (pass_shift = 0, pass = 0; pass < total_passes; pass++, pass_shift += 8) { const mz_uint32* pHist = &hist[pass << 8]; mz_uint offsets[256], cur_ofs = 0; for (i = 0; i < 256; i++) { offsets[i] = cur_ofs; cur_ofs += pHist[i]; } for (i = 0; i < num_syms; i++) pNew_syms[offsets[(pCur_syms[i].m_key >> pass_shift) & 0xFF]++] = pCur_syms[i]; { tdefl_sym_freq* t = pCur_syms; pCur_syms = pNew_syms; pNew_syms = t; } } return pCur_syms; } // tdefl_calculate_minimum_redundancy() originally written by: Alistair Moffat, alistair@cs.mu.oz.au, Jyrki Katajainen, jyrki@diku.dk, November 1996. static void tdefl_calculate_minimum_redundancy(tdefl_sym_freq *A, int n) { int root, leaf, next, avbl, used, dpth; if (n==0) return; else if (n==1) { A[0].m_key = 1; return; } A[0].m_key += A[1].m_key; root = 0; leaf = 2; for (next=1; next < n-1; next++) { if (leaf>=n || A[root].m_key=n || (root=0; next--) A[next].m_key = A[A[next].m_key].m_key+1; avbl = 1; used = dpth = 0; root = n-2; next = n-1; while (avbl>0) { while (root>=0 && (int)A[root].m_key==dpth) { used++; root--; } while (avbl>used) { A[next--].m_key = (mz_uint16)(dpth); avbl--; } avbl = 2*used; dpth++; used = 0; } } // Limits canonical Huffman code table's max code size. enum { TDEFL_MAX_SUPPORTED_HUFF_CODESIZE = 32 }; static void tdefl_huffman_enforce_max_code_size(int *pNum_codes, int code_list_len, int max_code_size) { int i; mz_uint32 total = 0; if (code_list_len <= 1) return; for (i = max_code_size + 1; i <= TDEFL_MAX_SUPPORTED_HUFF_CODESIZE; i++) pNum_codes[max_code_size] += pNum_codes[i]; for (i = max_code_size; i > 0; i--) total += (((mz_uint32)pNum_codes[i]) << (max_code_size - i)); while (total != (1UL << max_code_size)) { pNum_codes[max_code_size]--; for (i = max_code_size - 1; i > 0; i--) if (pNum_codes[i]) { pNum_codes[i]--; pNum_codes[i + 1] += 2; break; } total--; } } static void tdefl_optimize_huffman_table(tdefl_compressor *d, int table_num, int table_len, int code_size_limit, int static_table) { int i, j, l, num_codes[1 + TDEFL_MAX_SUPPORTED_HUFF_CODESIZE]; mz_uint next_code[TDEFL_MAX_SUPPORTED_HUFF_CODESIZE + 1]; MZ_CLEAR_OBJ(num_codes); if (static_table) { for (i = 0; i < table_len; i++) num_codes[d->m_huff_code_sizes[table_num][i]]++; } else { tdefl_sym_freq syms0[TDEFL_MAX_HUFF_SYMBOLS], syms1[TDEFL_MAX_HUFF_SYMBOLS], *pSyms; int num_used_syms = 0; const mz_uint16 *pSym_count = &d->m_huff_count[table_num][0]; for (i = 0; i < table_len; i++) if (pSym_count[i]) { syms0[num_used_syms].m_key = (mz_uint16)pSym_count[i]; syms0[num_used_syms++].m_sym_index = (mz_uint16)i; } pSyms = tdefl_radix_sort_syms(num_used_syms, syms0, syms1); tdefl_calculate_minimum_redundancy(pSyms, num_used_syms); for (i = 0; i < num_used_syms; i++) num_codes[pSyms[i].m_key]++; tdefl_huffman_enforce_max_code_size(num_codes, num_used_syms, code_size_limit); MZ_CLEAR_OBJ(d->m_huff_code_sizes[table_num]); MZ_CLEAR_OBJ(d->m_huff_codes[table_num]); for (i = 1, j = num_used_syms; i <= code_size_limit; i++) for (l = num_codes[i]; l > 0; l--) d->m_huff_code_sizes[table_num][pSyms[--j].m_sym_index] = (mz_uint8)(i); } next_code[1] = 0; for (j = 0, i = 2; i <= code_size_limit; i++) next_code[i] = j = ((j + num_codes[i - 1]) << 1); for (i = 0; i < table_len; i++) { mz_uint rev_code = 0, code, code_size; if ((code_size = d->m_huff_code_sizes[table_num][i]) == 0) continue; code = next_code[code_size]++; for (l = code_size; l > 0; l--, code >>= 1) rev_code = (rev_code << 1) | (code & 1); d->m_huff_codes[table_num][i] = (mz_uint16)rev_code; } } #define TDEFL_PUT_BITS(b, l) do { \ mz_uint bits = b; mz_uint len = l; MZ_ASSERT(bits <= ((1U << len) - 1U)); \ d->m_bit_buffer |= (bits << d->m_bits_in); d->m_bits_in += len; \ while (d->m_bits_in >= 8) { \ if (d->m_pOutput_buf < d->m_pOutput_buf_end) \ *d->m_pOutput_buf++ = (mz_uint8)(d->m_bit_buffer); \ d->m_bit_buffer >>= 8; \ d->m_bits_in -= 8; \ } \ } MZ_MACRO_END #define TDEFL_RLE_PREV_CODE_SIZE() { if (rle_repeat_count) { \ if (rle_repeat_count < 3) { \ d->m_huff_count[2][prev_code_size] = (mz_uint16)(d->m_huff_count[2][prev_code_size] + rle_repeat_count); \ while (rle_repeat_count--) packed_code_sizes[num_packed_code_sizes++] = prev_code_size; \ } else { \ d->m_huff_count[2][16] = (mz_uint16)(d->m_huff_count[2][16] + 1); packed_code_sizes[num_packed_code_sizes++] = 16; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_repeat_count - 3); \ } rle_repeat_count = 0; } } #define TDEFL_RLE_ZERO_CODE_SIZE() { if (rle_z_count) { \ if (rle_z_count < 3) { \ d->m_huff_count[2][0] = (mz_uint16)(d->m_huff_count[2][0] + rle_z_count); while (rle_z_count--) packed_code_sizes[num_packed_code_sizes++] = 0; \ } else if (rle_z_count <= 10) { \ d->m_huff_count[2][17] = (mz_uint16)(d->m_huff_count[2][17] + 1); packed_code_sizes[num_packed_code_sizes++] = 17; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_z_count - 3); \ } else { \ d->m_huff_count[2][18] = (mz_uint16)(d->m_huff_count[2][18] + 1); packed_code_sizes[num_packed_code_sizes++] = 18; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_z_count - 11); \ } rle_z_count = 0; } } static mz_uint8 s_tdefl_packed_code_size_syms_swizzle[] = { 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 }; static void tdefl_start_dynamic_block(tdefl_compressor *d) { int num_lit_codes, num_dist_codes, num_bit_lengths; mz_uint i, total_code_sizes_to_pack, num_packed_code_sizes, rle_z_count, rle_repeat_count, packed_code_sizes_index; mz_uint8 code_sizes_to_pack[TDEFL_MAX_HUFF_SYMBOLS_0 + TDEFL_MAX_HUFF_SYMBOLS_1], packed_code_sizes[TDEFL_MAX_HUFF_SYMBOLS_0 + TDEFL_MAX_HUFF_SYMBOLS_1], prev_code_size = 0xFF; d->m_huff_count[0][256] = 1; tdefl_optimize_huffman_table(d, 0, TDEFL_MAX_HUFF_SYMBOLS_0, 15, MZ_FALSE); tdefl_optimize_huffman_table(d, 1, TDEFL_MAX_HUFF_SYMBOLS_1, 15, MZ_FALSE); for (num_lit_codes = 286; num_lit_codes > 257; num_lit_codes--) if (d->m_huff_code_sizes[0][num_lit_codes - 1]) break; for (num_dist_codes = 30; num_dist_codes > 1; num_dist_codes--) if (d->m_huff_code_sizes[1][num_dist_codes - 1]) break; memcpy(code_sizes_to_pack, &d->m_huff_code_sizes[0][0], num_lit_codes); memcpy(code_sizes_to_pack + num_lit_codes, &d->m_huff_code_sizes[1][0], num_dist_codes); total_code_sizes_to_pack = num_lit_codes + num_dist_codes; num_packed_code_sizes = 0; rle_z_count = 0; rle_repeat_count = 0; memset(&d->m_huff_count[2][0], 0, sizeof(d->m_huff_count[2][0]) * TDEFL_MAX_HUFF_SYMBOLS_2); for (i = 0; i < total_code_sizes_to_pack; i++) { mz_uint8 code_size = code_sizes_to_pack[i]; if (!code_size) { TDEFL_RLE_PREV_CODE_SIZE(); if (++rle_z_count == 138) { TDEFL_RLE_ZERO_CODE_SIZE(); } } else { TDEFL_RLE_ZERO_CODE_SIZE(); if (code_size != prev_code_size) { TDEFL_RLE_PREV_CODE_SIZE(); d->m_huff_count[2][code_size] = (mz_uint16)(d->m_huff_count[2][code_size] + 1); packed_code_sizes[num_packed_code_sizes++] = code_size; } else if (++rle_repeat_count == 6) { TDEFL_RLE_PREV_CODE_SIZE(); } } prev_code_size = code_size; } if (rle_repeat_count) { TDEFL_RLE_PREV_CODE_SIZE(); } else { TDEFL_RLE_ZERO_CODE_SIZE(); } tdefl_optimize_huffman_table(d, 2, TDEFL_MAX_HUFF_SYMBOLS_2, 7, MZ_FALSE); TDEFL_PUT_BITS(2, 2); TDEFL_PUT_BITS(num_lit_codes - 257, 5); TDEFL_PUT_BITS(num_dist_codes - 1, 5); for (num_bit_lengths = 18; num_bit_lengths >= 0; num_bit_lengths--) if (d->m_huff_code_sizes[2][s_tdefl_packed_code_size_syms_swizzle[num_bit_lengths]]) break; num_bit_lengths = MZ_MAX(4, (num_bit_lengths + 1)); TDEFL_PUT_BITS(num_bit_lengths - 4, 4); for (i = 0; (int)i < num_bit_lengths; i++) TDEFL_PUT_BITS(d->m_huff_code_sizes[2][s_tdefl_packed_code_size_syms_swizzle[i]], 3); for (packed_code_sizes_index = 0; packed_code_sizes_index < num_packed_code_sizes; ) { mz_uint code = packed_code_sizes[packed_code_sizes_index++]; MZ_ASSERT(code < TDEFL_MAX_HUFF_SYMBOLS_2); TDEFL_PUT_BITS(d->m_huff_codes[2][code], d->m_huff_code_sizes[2][code]); if (code >= 16) TDEFL_PUT_BITS(packed_code_sizes[packed_code_sizes_index++], "\02\03\07"[code - 16]); } } static void tdefl_start_static_block(tdefl_compressor *d) { mz_uint i; mz_uint8 *p = &d->m_huff_code_sizes[0][0]; for (i = 0; i <= 143; ++i) *p++ = 8; for ( ; i <= 255; ++i) *p++ = 9; for ( ; i <= 279; ++i) *p++ = 7; for ( ; i <= 287; ++i) *p++ = 8; memset(d->m_huff_code_sizes[1], 5, 32); tdefl_optimize_huffman_table(d, 0, 288, 15, MZ_TRUE); tdefl_optimize_huffman_table(d, 1, 32, 15, MZ_TRUE); TDEFL_PUT_BITS(1, 2); } static const mz_uint mz_bitmasks[17] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF }; #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN && MINIZ_HAS_64BIT_REGISTERS static mz_bool tdefl_compress_lz_codes(tdefl_compressor *d) { mz_uint flags; mz_uint8 *pLZ_codes; mz_uint8 *pOutput_buf = d->m_pOutput_buf; mz_uint8 *pLZ_code_buf_end = d->m_pLZ_code_buf; mz_uint64 bit_buffer = d->m_bit_buffer; mz_uint bits_in = d->m_bits_in; #define TDEFL_PUT_BITS_FAST(b, l) { bit_buffer |= (((mz_uint64)(b)) << bits_in); bits_in += (l); } flags = 1; for (pLZ_codes = d->m_lz_code_buf; pLZ_codes < pLZ_code_buf_end; flags >>= 1) { if (flags == 1) flags = *pLZ_codes++ | 0x100; if (flags & 1) { mz_uint s0, s1, n0, n1, sym, num_extra_bits; mz_uint match_len = pLZ_codes[0], match_dist = *(const mz_uint16 *)(pLZ_codes + 1); pLZ_codes += 3; MZ_ASSERT(d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]); TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][s_tdefl_len_sym[match_len]], d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]); TDEFL_PUT_BITS_FAST(match_len & mz_bitmasks[s_tdefl_len_extra[match_len]], s_tdefl_len_extra[match_len]); // This sequence coaxes MSVC into using cmov's vs. jmp's. s0 = s_tdefl_small_dist_sym[match_dist & 511]; n0 = s_tdefl_small_dist_extra[match_dist & 511]; s1 = s_tdefl_large_dist_sym[match_dist >> 8]; n1 = s_tdefl_large_dist_extra[match_dist >> 8]; sym = (match_dist < 512) ? s0 : s1; num_extra_bits = (match_dist < 512) ? n0 : n1; MZ_ASSERT(d->m_huff_code_sizes[1][sym]); TDEFL_PUT_BITS_FAST(d->m_huff_codes[1][sym], d->m_huff_code_sizes[1][sym]); TDEFL_PUT_BITS_FAST(match_dist & mz_bitmasks[num_extra_bits], num_extra_bits); } else { mz_uint lit = *pLZ_codes++; MZ_ASSERT(d->m_huff_code_sizes[0][lit]); TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]); if (((flags & 2) == 0) && (pLZ_codes < pLZ_code_buf_end)) { flags >>= 1; lit = *pLZ_codes++; MZ_ASSERT(d->m_huff_code_sizes[0][lit]); TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]); if (((flags & 2) == 0) && (pLZ_codes < pLZ_code_buf_end)) { flags >>= 1; lit = *pLZ_codes++; MZ_ASSERT(d->m_huff_code_sizes[0][lit]); TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]); } } } if (pOutput_buf >= d->m_pOutput_buf_end) return MZ_FALSE; *(mz_uint64*)pOutput_buf = bit_buffer; pOutput_buf += (bits_in >> 3); bit_buffer >>= (bits_in & ~7); bits_in &= 7; } #undef TDEFL_PUT_BITS_FAST d->m_pOutput_buf = pOutput_buf; d->m_bits_in = 0; d->m_bit_buffer = 0; while (bits_in) { mz_uint32 n = MZ_MIN(bits_in, 16); TDEFL_PUT_BITS((mz_uint)bit_buffer & mz_bitmasks[n], n); bit_buffer >>= n; bits_in -= n; } TDEFL_PUT_BITS(d->m_huff_codes[0][256], d->m_huff_code_sizes[0][256]); return (d->m_pOutput_buf < d->m_pOutput_buf_end); } #else static mz_bool tdefl_compress_lz_codes(tdefl_compressor *d) { mz_uint flags; mz_uint8 *pLZ_codes; flags = 1; for (pLZ_codes = d->m_lz_code_buf; pLZ_codes < d->m_pLZ_code_buf; flags >>= 1) { if (flags == 1) flags = *pLZ_codes++ | 0x100; if (flags & 1) { mz_uint sym, num_extra_bits; mz_uint match_len = pLZ_codes[0], match_dist = (pLZ_codes[1] | (pLZ_codes[2] << 8)); pLZ_codes += 3; MZ_ASSERT(d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]); TDEFL_PUT_BITS(d->m_huff_codes[0][s_tdefl_len_sym[match_len]], d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]); TDEFL_PUT_BITS(match_len & mz_bitmasks[s_tdefl_len_extra[match_len]], s_tdefl_len_extra[match_len]); if (match_dist < 512) { sym = s_tdefl_small_dist_sym[match_dist]; num_extra_bits = s_tdefl_small_dist_extra[match_dist]; } else { sym = s_tdefl_large_dist_sym[match_dist >> 8]; num_extra_bits = s_tdefl_large_dist_extra[match_dist >> 8]; } MZ_ASSERT(d->m_huff_code_sizes[1][sym]); TDEFL_PUT_BITS(d->m_huff_codes[1][sym], d->m_huff_code_sizes[1][sym]); TDEFL_PUT_BITS(match_dist & mz_bitmasks[num_extra_bits], num_extra_bits); } else { mz_uint lit = *pLZ_codes++; MZ_ASSERT(d->m_huff_code_sizes[0][lit]); TDEFL_PUT_BITS(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]); } } TDEFL_PUT_BITS(d->m_huff_codes[0][256], d->m_huff_code_sizes[0][256]); return (d->m_pOutput_buf < d->m_pOutput_buf_end); } #endif // MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN && MINIZ_HAS_64BIT_REGISTERS static mz_bool tdefl_compress_block(tdefl_compressor *d, mz_bool static_block) { if (static_block) tdefl_start_static_block(d); else tdefl_start_dynamic_block(d); return tdefl_compress_lz_codes(d); } static int tdefl_flush_block(tdefl_compressor *d, int flush) { mz_uint saved_bit_buf, saved_bits_in; mz_uint8 *pSaved_output_buf; mz_bool comp_block_succeeded = MZ_FALSE; int n, use_raw_block = ((d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS) != 0) && (d->m_lookahead_pos - d->m_lz_code_buf_dict_pos) <= d->m_dict_size; mz_uint8 *pOutput_buf_start = ((d->m_pPut_buf_func == NULL) && ((*d->m_pOut_buf_size - d->m_out_buf_ofs) >= TDEFL_OUT_BUF_SIZE)) ? ((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs) : d->m_output_buf; d->m_pOutput_buf = pOutput_buf_start; d->m_pOutput_buf_end = d->m_pOutput_buf + TDEFL_OUT_BUF_SIZE - 16; MZ_ASSERT(!d->m_output_flush_remaining); d->m_output_flush_ofs = 0; d->m_output_flush_remaining = 0; *d->m_pLZ_flags = (mz_uint8)(*d->m_pLZ_flags >> d->m_num_flags_left); d->m_pLZ_code_buf -= (d->m_num_flags_left == 8); if ((d->m_flags & TDEFL_WRITE_ZLIB_HEADER) && (!d->m_block_index)) { TDEFL_PUT_BITS(0x78, 8); TDEFL_PUT_BITS(0x01, 8); } TDEFL_PUT_BITS(flush == TDEFL_FINISH, 1); pSaved_output_buf = d->m_pOutput_buf; saved_bit_buf = d->m_bit_buffer; saved_bits_in = d->m_bits_in; if (!use_raw_block) comp_block_succeeded = tdefl_compress_block(d, (d->m_flags & TDEFL_FORCE_ALL_STATIC_BLOCKS) || (d->m_total_lz_bytes < 48)); // If the block gets expanded, forget the current contents of the output buffer and send a raw block instead. if ( ((use_raw_block) || ((d->m_total_lz_bytes) && ((d->m_pOutput_buf - pSaved_output_buf + 1U) >= d->m_total_lz_bytes))) && ((d->m_lookahead_pos - d->m_lz_code_buf_dict_pos) <= d->m_dict_size) ) { mz_uint i; d->m_pOutput_buf = pSaved_output_buf; d->m_bit_buffer = saved_bit_buf, d->m_bits_in = saved_bits_in; TDEFL_PUT_BITS(0, 2); if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); } for (i = 2; i; --i, d->m_total_lz_bytes ^= 0xFFFF) { TDEFL_PUT_BITS(d->m_total_lz_bytes & 0xFFFF, 16); } for (i = 0; i < d->m_total_lz_bytes; ++i) { TDEFL_PUT_BITS(d->m_dict[(d->m_lz_code_buf_dict_pos + i) & TDEFL_LZ_DICT_SIZE_MASK], 8); } } // Check for the extremely unlikely (if not impossible) case of the compressed block not fitting into the output buffer when using dynamic codes. else if (!comp_block_succeeded) { d->m_pOutput_buf = pSaved_output_buf; d->m_bit_buffer = saved_bit_buf, d->m_bits_in = saved_bits_in; tdefl_compress_block(d, MZ_TRUE); } if (flush) { if (flush == TDEFL_FINISH) { if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); } if (d->m_flags & TDEFL_WRITE_ZLIB_HEADER) { mz_uint i, a = d->m_adler32; for (i = 0; i < 4; i++) { TDEFL_PUT_BITS((a >> 24) & 0xFF, 8); a <<= 8; } } } else { mz_uint i, z = 0; TDEFL_PUT_BITS(0, 3); if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); } for (i = 2; i; --i, z ^= 0xFFFF) { TDEFL_PUT_BITS(z & 0xFFFF, 16); } } } MZ_ASSERT(d->m_pOutput_buf < d->m_pOutput_buf_end); memset(&d->m_huff_count[0][0], 0, sizeof(d->m_huff_count[0][0]) * TDEFL_MAX_HUFF_SYMBOLS_0); memset(&d->m_huff_count[1][0], 0, sizeof(d->m_huff_count[1][0]) * TDEFL_MAX_HUFF_SYMBOLS_1); d->m_pLZ_code_buf = d->m_lz_code_buf + 1; d->m_pLZ_flags = d->m_lz_code_buf; d->m_num_flags_left = 8; d->m_lz_code_buf_dict_pos += d->m_total_lz_bytes; d->m_total_lz_bytes = 0; d->m_block_index++; if ((n = (int)(d->m_pOutput_buf - pOutput_buf_start)) != 0) { if (d->m_pPut_buf_func) { *d->m_pIn_buf_size = d->m_pSrc - (const mz_uint8 *)d->m_pIn_buf; if (!(*d->m_pPut_buf_func)(d->m_output_buf, n, d->m_pPut_buf_user)) return (d->m_prev_return_status = TDEFL_STATUS_PUT_BUF_FAILED); } else if (pOutput_buf_start == d->m_output_buf) { int bytes_to_copy = (int)MZ_MIN((size_t)n, (size_t)(*d->m_pOut_buf_size - d->m_out_buf_ofs)); memcpy((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs, d->m_output_buf, bytes_to_copy); d->m_out_buf_ofs += bytes_to_copy; if ((n -= bytes_to_copy) != 0) { d->m_output_flush_ofs = bytes_to_copy; d->m_output_flush_remaining = n; } } else { d->m_out_buf_ofs += n; } } return d->m_output_flush_remaining; } #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES #define TDEFL_READ_UNALIGNED_WORD(p) *(const mz_uint16*)(p) static MZ_FORCEINLINE void tdefl_find_match(tdefl_compressor *d, mz_uint lookahead_pos, mz_uint max_dist, mz_uint max_match_len, mz_uint *pMatch_dist, mz_uint *pMatch_len) { mz_uint dist, pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK, match_len = *pMatch_len, probe_pos = pos, next_probe_pos, probe_len; mz_uint num_probes_left = d->m_max_probes[match_len >= 32]; const mz_uint16 *s = (const mz_uint16*)(d->m_dict + pos), *p, *q; mz_uint16 c01 = TDEFL_READ_UNALIGNED_WORD(&d->m_dict[pos + match_len - 1]), s01 = TDEFL_READ_UNALIGNED_WORD(s); MZ_ASSERT(max_match_len <= TDEFL_MAX_MATCH_LEN); if (max_match_len <= match_len) return; for ( ; ; ) { for ( ; ; ) { if (--num_probes_left == 0) return; #define TDEFL_PROBE \ next_probe_pos = d->m_next[probe_pos]; \ if ((!next_probe_pos) || ((dist = (mz_uint16)(lookahead_pos - next_probe_pos)) > max_dist)) return; \ probe_pos = next_probe_pos & TDEFL_LZ_DICT_SIZE_MASK; \ if (TDEFL_READ_UNALIGNED_WORD(&d->m_dict[probe_pos + match_len - 1]) == c01) break; TDEFL_PROBE; TDEFL_PROBE; TDEFL_PROBE; } if (!dist) break; q = (const mz_uint16*)(d->m_dict + probe_pos); if (TDEFL_READ_UNALIGNED_WORD(q) != s01) continue; p = s; probe_len = 32; do { } while ( (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (--probe_len > 0) ); if (!probe_len) { *pMatch_dist = dist; *pMatch_len = MZ_MIN(max_match_len, TDEFL_MAX_MATCH_LEN); break; } else if ((probe_len = ((mz_uint)(p - s) * 2) + (mz_uint)(*(const mz_uint8*)p == *(const mz_uint8*)q)) > match_len) { *pMatch_dist = dist; if ((*pMatch_len = match_len = MZ_MIN(max_match_len, probe_len)) == max_match_len) break; c01 = TDEFL_READ_UNALIGNED_WORD(&d->m_dict[pos + match_len - 1]); } } } #else static MZ_FORCEINLINE void tdefl_find_match(tdefl_compressor *d, mz_uint lookahead_pos, mz_uint max_dist, mz_uint max_match_len, mz_uint *pMatch_dist, mz_uint *pMatch_len) { mz_uint dist, pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK, match_len = *pMatch_len, probe_pos = pos, next_probe_pos, probe_len; mz_uint num_probes_left = d->m_max_probes[match_len >= 32]; const mz_uint8 *s = d->m_dict + pos, *p, *q; mz_uint8 c0 = d->m_dict[pos + match_len], c1 = d->m_dict[pos + match_len - 1]; MZ_ASSERT(max_match_len <= TDEFL_MAX_MATCH_LEN); if (max_match_len <= match_len) return; for ( ; ; ) { for ( ; ; ) { if (--num_probes_left == 0) return; #define TDEFL_PROBE \ next_probe_pos = d->m_next[probe_pos]; \ if ((!next_probe_pos) || ((dist = (mz_uint16)(lookahead_pos - next_probe_pos)) > max_dist)) return; \ probe_pos = next_probe_pos & TDEFL_LZ_DICT_SIZE_MASK; \ if ((d->m_dict[probe_pos + match_len] == c0) && (d->m_dict[probe_pos + match_len - 1] == c1)) break; TDEFL_PROBE; TDEFL_PROBE; TDEFL_PROBE; } if (!dist) break; p = s; q = d->m_dict + probe_pos; for (probe_len = 0; probe_len < max_match_len; probe_len++) if (*p++ != *q++) break; if (probe_len > match_len) { *pMatch_dist = dist; if ((*pMatch_len = match_len = probe_len) == max_match_len) return; c0 = d->m_dict[pos + match_len]; c1 = d->m_dict[pos + match_len - 1]; } } } #endif // #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN static mz_bool tdefl_compress_fast(tdefl_compressor *d) { // Faster, minimally featured LZRW1-style match+parse loop with better register utilization. Intended for applications where raw throughput is valued more highly than ratio. mz_uint lookahead_pos = d->m_lookahead_pos, lookahead_size = d->m_lookahead_size, dict_size = d->m_dict_size, total_lz_bytes = d->m_total_lz_bytes, num_flags_left = d->m_num_flags_left; mz_uint8 *pLZ_code_buf = d->m_pLZ_code_buf, *pLZ_flags = d->m_pLZ_flags; mz_uint cur_pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK; while ((d->m_src_buf_left) || ((d->m_flush) && (lookahead_size))) { const mz_uint TDEFL_COMP_FAST_LOOKAHEAD_SIZE = 4096; mz_uint dst_pos = (lookahead_pos + lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK; mz_uint num_bytes_to_process = (mz_uint)MZ_MIN(d->m_src_buf_left, TDEFL_COMP_FAST_LOOKAHEAD_SIZE - lookahead_size); d->m_src_buf_left -= num_bytes_to_process; lookahead_size += num_bytes_to_process; while (num_bytes_to_process) { mz_uint32 n = MZ_MIN(TDEFL_LZ_DICT_SIZE - dst_pos, num_bytes_to_process); memcpy(d->m_dict + dst_pos, d->m_pSrc, n); if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1)) memcpy(d->m_dict + TDEFL_LZ_DICT_SIZE + dst_pos, d->m_pSrc, MZ_MIN(n, (TDEFL_MAX_MATCH_LEN - 1) - dst_pos)); d->m_pSrc += n; dst_pos = (dst_pos + n) & TDEFL_LZ_DICT_SIZE_MASK; num_bytes_to_process -= n; } dict_size = MZ_MIN(TDEFL_LZ_DICT_SIZE - lookahead_size, dict_size); if ((!d->m_flush) && (lookahead_size < TDEFL_COMP_FAST_LOOKAHEAD_SIZE)) break; while (lookahead_size >= 4) { mz_uint cur_match_dist, cur_match_len = 1; mz_uint8 *pCur_dict = d->m_dict + cur_pos; mz_uint first_trigram = (*(const mz_uint32 *)pCur_dict) & 0xFFFFFF; mz_uint hash = (first_trigram ^ (first_trigram >> (24 - (TDEFL_LZ_HASH_BITS - 8)))) & TDEFL_LEVEL1_HASH_SIZE_MASK; mz_uint probe_pos = d->m_hash[hash]; d->m_hash[hash] = (mz_uint16)lookahead_pos; if (((cur_match_dist = (mz_uint16)(lookahead_pos - probe_pos)) <= dict_size) && ((*(const mz_uint32 *)(d->m_dict + (probe_pos &= TDEFL_LZ_DICT_SIZE_MASK)) & 0xFFFFFF) == first_trigram)) { const mz_uint16 *p = (const mz_uint16 *)pCur_dict; const mz_uint16 *q = (const mz_uint16 *)(d->m_dict + probe_pos); mz_uint32 probe_len = 32; do { } while ( (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (--probe_len > 0) ); cur_match_len = ((mz_uint)(p - (const mz_uint16 *)pCur_dict) * 2) + (mz_uint)(*(const mz_uint8 *)p == *(const mz_uint8 *)q); if (!probe_len) cur_match_len = cur_match_dist ? TDEFL_MAX_MATCH_LEN : 0; if ((cur_match_len < TDEFL_MIN_MATCH_LEN) || ((cur_match_len == TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 8U*1024U))) { cur_match_len = 1; *pLZ_code_buf++ = (mz_uint8)first_trigram; *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1); d->m_huff_count[0][(mz_uint8)first_trigram]++; } else { mz_uint32 s0, s1; cur_match_len = MZ_MIN(cur_match_len, lookahead_size); MZ_ASSERT((cur_match_len >= TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 1) && (cur_match_dist <= TDEFL_LZ_DICT_SIZE)); cur_match_dist--; pLZ_code_buf[0] = (mz_uint8)(cur_match_len - TDEFL_MIN_MATCH_LEN); *(mz_uint16 *)(&pLZ_code_buf[1]) = (mz_uint16)cur_match_dist; pLZ_code_buf += 3; *pLZ_flags = (mz_uint8)((*pLZ_flags >> 1) | 0x80); s0 = s_tdefl_small_dist_sym[cur_match_dist & 511]; s1 = s_tdefl_large_dist_sym[cur_match_dist >> 8]; d->m_huff_count[1][(cur_match_dist < 512) ? s0 : s1]++; d->m_huff_count[0][s_tdefl_len_sym[cur_match_len - TDEFL_MIN_MATCH_LEN]]++; } } else { *pLZ_code_buf++ = (mz_uint8)first_trigram; *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1); d->m_huff_count[0][(mz_uint8)first_trigram]++; } if (--num_flags_left == 0) { num_flags_left = 8; pLZ_flags = pLZ_code_buf++; } total_lz_bytes += cur_match_len; lookahead_pos += cur_match_len; dict_size = MZ_MIN(dict_size + cur_match_len, TDEFL_LZ_DICT_SIZE); cur_pos = (cur_pos + cur_match_len) & TDEFL_LZ_DICT_SIZE_MASK; MZ_ASSERT(lookahead_size >= cur_match_len); lookahead_size -= cur_match_len; if (pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8]) { int n; d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size; d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left; if ((n = tdefl_flush_block(d, 0)) != 0) return (n < 0) ? MZ_FALSE : MZ_TRUE; total_lz_bytes = d->m_total_lz_bytes; pLZ_code_buf = d->m_pLZ_code_buf; pLZ_flags = d->m_pLZ_flags; num_flags_left = d->m_num_flags_left; } } while (lookahead_size) { mz_uint8 lit = d->m_dict[cur_pos]; total_lz_bytes++; *pLZ_code_buf++ = lit; *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1); if (--num_flags_left == 0) { num_flags_left = 8; pLZ_flags = pLZ_code_buf++; } d->m_huff_count[0][lit]++; lookahead_pos++; dict_size = MZ_MIN(dict_size + 1, TDEFL_LZ_DICT_SIZE); cur_pos = (cur_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK; lookahead_size--; if (pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8]) { int n; d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size; d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left; if ((n = tdefl_flush_block(d, 0)) != 0) return (n < 0) ? MZ_FALSE : MZ_TRUE; total_lz_bytes = d->m_total_lz_bytes; pLZ_code_buf = d->m_pLZ_code_buf; pLZ_flags = d->m_pLZ_flags; num_flags_left = d->m_num_flags_left; } } } d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size; d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left; return MZ_TRUE; } #endif // MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN static MZ_FORCEINLINE void tdefl_record_literal(tdefl_compressor *d, mz_uint8 lit) { d->m_total_lz_bytes++; *d->m_pLZ_code_buf++ = lit; *d->m_pLZ_flags = (mz_uint8)(*d->m_pLZ_flags >> 1); if (--d->m_num_flags_left == 0) { d->m_num_flags_left = 8; d->m_pLZ_flags = d->m_pLZ_code_buf++; } d->m_huff_count[0][lit]++; } static MZ_FORCEINLINE void tdefl_record_match(tdefl_compressor *d, mz_uint match_len, mz_uint match_dist) { mz_uint32 s0, s1; MZ_ASSERT((match_len >= TDEFL_MIN_MATCH_LEN) && (match_dist >= 1) && (match_dist <= TDEFL_LZ_DICT_SIZE)); d->m_total_lz_bytes += match_len; d->m_pLZ_code_buf[0] = (mz_uint8)(match_len - TDEFL_MIN_MATCH_LEN); match_dist -= 1; d->m_pLZ_code_buf[1] = (mz_uint8)(match_dist & 0xFF); d->m_pLZ_code_buf[2] = (mz_uint8)(match_dist >> 8); d->m_pLZ_code_buf += 3; *d->m_pLZ_flags = (mz_uint8)((*d->m_pLZ_flags >> 1) | 0x80); if (--d->m_num_flags_left == 0) { d->m_num_flags_left = 8; d->m_pLZ_flags = d->m_pLZ_code_buf++; } s0 = s_tdefl_small_dist_sym[match_dist & 511]; s1 = s_tdefl_large_dist_sym[(match_dist >> 8) & 127]; d->m_huff_count[1][(match_dist < 512) ? s0 : s1]++; if (match_len >= TDEFL_MIN_MATCH_LEN) d->m_huff_count[0][s_tdefl_len_sym[match_len - TDEFL_MIN_MATCH_LEN]]++; } static mz_bool tdefl_compress_normal(tdefl_compressor *d) { const mz_uint8 *pSrc = d->m_pSrc; size_t src_buf_left = d->m_src_buf_left; tdefl_flush flush = d->m_flush; while ((src_buf_left) || ((flush) && (d->m_lookahead_size))) { mz_uint len_to_move, cur_match_dist, cur_match_len, cur_pos; // Update dictionary and hash chains. Keeps the lookahead size equal to TDEFL_MAX_MATCH_LEN. if ((d->m_lookahead_size + d->m_dict_size) >= (TDEFL_MIN_MATCH_LEN - 1)) { mz_uint dst_pos = (d->m_lookahead_pos + d->m_lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK, ins_pos = d->m_lookahead_pos + d->m_lookahead_size - 2; mz_uint hash = (d->m_dict[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] << TDEFL_LZ_HASH_SHIFT) ^ d->m_dict[(ins_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK]; mz_uint num_bytes_to_process = (mz_uint)MZ_MIN(src_buf_left, TDEFL_MAX_MATCH_LEN - d->m_lookahead_size); const mz_uint8 *pSrc_end = pSrc + num_bytes_to_process; src_buf_left -= num_bytes_to_process; d->m_lookahead_size += num_bytes_to_process; while (pSrc != pSrc_end) { mz_uint8 c = *pSrc++; d->m_dict[dst_pos] = c; if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1)) d->m_dict[TDEFL_LZ_DICT_SIZE + dst_pos] = c; hash = ((hash << TDEFL_LZ_HASH_SHIFT) ^ c) & (TDEFL_LZ_HASH_SIZE - 1); d->m_next[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] = d->m_hash[hash]; d->m_hash[hash] = (mz_uint16)(ins_pos); dst_pos = (dst_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK; ins_pos++; } } else { while ((src_buf_left) && (d->m_lookahead_size < TDEFL_MAX_MATCH_LEN)) { mz_uint8 c = *pSrc++; mz_uint dst_pos = (d->m_lookahead_pos + d->m_lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK; src_buf_left--; d->m_dict[dst_pos] = c; if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1)) d->m_dict[TDEFL_LZ_DICT_SIZE + dst_pos] = c; if ((++d->m_lookahead_size + d->m_dict_size) >= TDEFL_MIN_MATCH_LEN) { mz_uint ins_pos = d->m_lookahead_pos + (d->m_lookahead_size - 1) - 2; mz_uint hash = ((d->m_dict[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] << (TDEFL_LZ_HASH_SHIFT * 2)) ^ (d->m_dict[(ins_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK] << TDEFL_LZ_HASH_SHIFT) ^ c) & (TDEFL_LZ_HASH_SIZE - 1); d->m_next[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] = d->m_hash[hash]; d->m_hash[hash] = (mz_uint16)(ins_pos); } } } d->m_dict_size = MZ_MIN(TDEFL_LZ_DICT_SIZE - d->m_lookahead_size, d->m_dict_size); if ((!flush) && (d->m_lookahead_size < TDEFL_MAX_MATCH_LEN)) break; // Simple lazy/greedy parsing state machine. len_to_move = 1; cur_match_dist = 0; cur_match_len = d->m_saved_match_len ? d->m_saved_match_len : (TDEFL_MIN_MATCH_LEN - 1); cur_pos = d->m_lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK; if (d->m_flags & (TDEFL_RLE_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS)) { if ((d->m_dict_size) && (!(d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS))) { mz_uint8 c = d->m_dict[(cur_pos - 1) & TDEFL_LZ_DICT_SIZE_MASK]; cur_match_len = 0; while (cur_match_len < d->m_lookahead_size) { if (d->m_dict[cur_pos + cur_match_len] != c) break; cur_match_len++; } if (cur_match_len < TDEFL_MIN_MATCH_LEN) cur_match_len = 0; else cur_match_dist = 1; } } else { tdefl_find_match(d, d->m_lookahead_pos, d->m_dict_size, d->m_lookahead_size, &cur_match_dist, &cur_match_len); } if (((cur_match_len == TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 8U*1024U)) || (cur_pos == cur_match_dist) || ((d->m_flags & TDEFL_FILTER_MATCHES) && (cur_match_len <= 5))) { cur_match_dist = cur_match_len = 0; } if (d->m_saved_match_len) { if (cur_match_len > d->m_saved_match_len) { tdefl_record_literal(d, (mz_uint8)d->m_saved_lit); if (cur_match_len >= 128) { tdefl_record_match(d, cur_match_len, cur_match_dist); d->m_saved_match_len = 0; len_to_move = cur_match_len; } else { d->m_saved_lit = d->m_dict[cur_pos]; d->m_saved_match_dist = cur_match_dist; d->m_saved_match_len = cur_match_len; } } else { tdefl_record_match(d, d->m_saved_match_len, d->m_saved_match_dist); len_to_move = d->m_saved_match_len - 1; d->m_saved_match_len = 0; } } else if (!cur_match_dist) tdefl_record_literal(d, d->m_dict[MZ_MIN(cur_pos, sizeof(d->m_dict) - 1)]); else if ((d->m_greedy_parsing) || (d->m_flags & TDEFL_RLE_MATCHES) || (cur_match_len >= 128)) { tdefl_record_match(d, cur_match_len, cur_match_dist); len_to_move = cur_match_len; } else { d->m_saved_lit = d->m_dict[MZ_MIN(cur_pos, sizeof(d->m_dict) - 1)]; d->m_saved_match_dist = cur_match_dist; d->m_saved_match_len = cur_match_len; } // Move the lookahead forward by len_to_move bytes. d->m_lookahead_pos += len_to_move; MZ_ASSERT(d->m_lookahead_size >= len_to_move); d->m_lookahead_size -= len_to_move; d->m_dict_size = MZ_MIN(d->m_dict_size + len_to_move, TDEFL_LZ_DICT_SIZE); // Check if it's time to flush the current LZ codes to the internal output buffer. if ( (d->m_pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8]) || ( (d->m_total_lz_bytes > 31*1024) && (((((mz_uint)(d->m_pLZ_code_buf - d->m_lz_code_buf) * 115) >> 7) >= d->m_total_lz_bytes) || (d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS))) ) { int n; d->m_pSrc = pSrc; d->m_src_buf_left = src_buf_left; if ((n = tdefl_flush_block(d, 0)) != 0) return (n < 0) ? MZ_FALSE : MZ_TRUE; } } d->m_pSrc = pSrc; d->m_src_buf_left = src_buf_left; return MZ_TRUE; } static tdefl_status tdefl_flush_output_buffer(tdefl_compressor *d) { if (d->m_pIn_buf_size) { *d->m_pIn_buf_size = d->m_pSrc - (const mz_uint8 *)d->m_pIn_buf; } if (d->m_pOut_buf_size) { size_t n = MZ_MIN(*d->m_pOut_buf_size - d->m_out_buf_ofs, d->m_output_flush_remaining); memcpy((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs, d->m_output_buf + d->m_output_flush_ofs, n); d->m_output_flush_ofs += (mz_uint)n; d->m_output_flush_remaining -= (mz_uint)n; d->m_out_buf_ofs += n; *d->m_pOut_buf_size = d->m_out_buf_ofs; } return (d->m_finished && !d->m_output_flush_remaining) ? TDEFL_STATUS_DONE : TDEFL_STATUS_OKAY; } tdefl_status tdefl_compress(tdefl_compressor *d, const void *pIn_buf, size_t *pIn_buf_size, void *pOut_buf, size_t *pOut_buf_size, tdefl_flush flush) { if (!d) { if (pIn_buf_size) *pIn_buf_size = 0; if (pOut_buf_size) *pOut_buf_size = 0; return TDEFL_STATUS_BAD_PARAM; } d->m_pIn_buf = pIn_buf; d->m_pIn_buf_size = pIn_buf_size; d->m_pOut_buf = pOut_buf; d->m_pOut_buf_size = pOut_buf_size; d->m_pSrc = (const mz_uint8 *)(pIn_buf); d->m_src_buf_left = pIn_buf_size ? *pIn_buf_size : 0; d->m_out_buf_ofs = 0; d->m_flush = flush; if ( ((d->m_pPut_buf_func != NULL) == ((pOut_buf != NULL) || (pOut_buf_size != NULL))) || (d->m_prev_return_status != TDEFL_STATUS_OKAY) || (d->m_wants_to_finish && (flush != TDEFL_FINISH)) || (pIn_buf_size && *pIn_buf_size && !pIn_buf) || (pOut_buf_size && *pOut_buf_size && !pOut_buf) ) { if (pIn_buf_size) *pIn_buf_size = 0; if (pOut_buf_size) *pOut_buf_size = 0; return (d->m_prev_return_status = TDEFL_STATUS_BAD_PARAM); } d->m_wants_to_finish |= (flush == TDEFL_FINISH); if ((d->m_output_flush_remaining) || (d->m_finished)) return (d->m_prev_return_status = tdefl_flush_output_buffer(d)); #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN if (((d->m_flags & TDEFL_MAX_PROBES_MASK) == 1) && ((d->m_flags & TDEFL_GREEDY_PARSING_FLAG) != 0) && ((d->m_flags & (TDEFL_FILTER_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS | TDEFL_RLE_MATCHES)) == 0)) { if (!tdefl_compress_fast(d)) return d->m_prev_return_status; } else #endif // #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN { if (!tdefl_compress_normal(d)) return d->m_prev_return_status; } if ((d->m_flags & (TDEFL_WRITE_ZLIB_HEADER | TDEFL_COMPUTE_ADLER32)) && (pIn_buf)) d->m_adler32 = (mz_uint32)mz_adler32(d->m_adler32, (const mz_uint8 *)pIn_buf, d->m_pSrc - (const mz_uint8 *)pIn_buf); if ((flush) && (!d->m_lookahead_size) && (!d->m_src_buf_left) && (!d->m_output_flush_remaining)) { if (tdefl_flush_block(d, flush) < 0) return d->m_prev_return_status; d->m_finished = (flush == TDEFL_FINISH); if (flush == TDEFL_FULL_FLUSH) { MZ_CLEAR_OBJ(d->m_hash); MZ_CLEAR_OBJ(d->m_next); d->m_dict_size = 0; } } return (d->m_prev_return_status = tdefl_flush_output_buffer(d)); } tdefl_status tdefl_compress_buffer(tdefl_compressor *d, const void *pIn_buf, size_t in_buf_size, tdefl_flush flush) { MZ_ASSERT(d->m_pPut_buf_func); return tdefl_compress(d, pIn_buf, &in_buf_size, NULL, NULL, flush); } tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags) { d->m_pPut_buf_func = pPut_buf_func; d->m_pPut_buf_user = pPut_buf_user; d->m_flags = (mz_uint)(flags); d->m_max_probes[0] = 1 + ((flags & 0xFFF) + 2) / 3; d->m_greedy_parsing = (flags & TDEFL_GREEDY_PARSING_FLAG) != 0; d->m_max_probes[1] = 1 + (((flags & 0xFFF) >> 2) + 2) / 3; if (!(flags & TDEFL_NONDETERMINISTIC_PARSING_FLAG)) MZ_CLEAR_OBJ(d->m_hash); d->m_lookahead_pos = d->m_lookahead_size = d->m_dict_size = d->m_total_lz_bytes = d->m_lz_code_buf_dict_pos = d->m_bits_in = 0; d->m_output_flush_ofs = d->m_output_flush_remaining = d->m_finished = d->m_block_index = d->m_bit_buffer = d->m_wants_to_finish = 0; d->m_pLZ_code_buf = d->m_lz_code_buf + 1; d->m_pLZ_flags = d->m_lz_code_buf; d->m_num_flags_left = 8; d->m_pOutput_buf = d->m_output_buf; d->m_pOutput_buf_end = d->m_output_buf; d->m_prev_return_status = TDEFL_STATUS_OKAY; d->m_saved_match_dist = d->m_saved_match_len = d->m_saved_lit = 0; d->m_adler32 = 1; d->m_pIn_buf = NULL; d->m_pOut_buf = NULL; d->m_pIn_buf_size = NULL; d->m_pOut_buf_size = NULL; d->m_flush = TDEFL_NO_FLUSH; d->m_pSrc = NULL; d->m_src_buf_left = 0; d->m_out_buf_ofs = 0; memset(&d->m_huff_count[0][0], 0, sizeof(d->m_huff_count[0][0]) * TDEFL_MAX_HUFF_SYMBOLS_0); memset(&d->m_huff_count[1][0], 0, sizeof(d->m_huff_count[1][0]) * TDEFL_MAX_HUFF_SYMBOLS_1); return TDEFL_STATUS_OKAY; } tdefl_status tdefl_get_prev_return_status(tdefl_compressor *d) { return d->m_prev_return_status; } mz_uint32 tdefl_get_adler32(tdefl_compressor *d) { return d->m_adler32; } mz_bool tdefl_compress_mem_to_output(const void *pBuf, size_t buf_len, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags) { tdefl_compressor *pComp; mz_bool succeeded; if (((buf_len) && (!pBuf)) || (!pPut_buf_func)) return MZ_FALSE; pComp = (tdefl_compressor*)MZ_MALLOC(sizeof(tdefl_compressor)); if (!pComp) return MZ_FALSE; succeeded = (tdefl_init(pComp, pPut_buf_func, pPut_buf_user, flags) == TDEFL_STATUS_OKAY); succeeded = succeeded && (tdefl_compress_buffer(pComp, pBuf, buf_len, TDEFL_FINISH) == TDEFL_STATUS_DONE); MZ_FREE(pComp); return succeeded; } typedef struct { size_t m_size, m_capacity; mz_uint8 *m_pBuf; mz_bool m_expandable; } tdefl_output_buffer; static mz_bool tdefl_output_buffer_putter(const void *pBuf, int len, void *pUser) { tdefl_output_buffer *p = (tdefl_output_buffer *)pUser; size_t new_size = p->m_size + len; if (new_size > p->m_capacity) { size_t new_capacity = p->m_capacity; mz_uint8 *pNew_buf; if (!p->m_expandable) return MZ_FALSE; do { new_capacity = MZ_MAX(128U, new_capacity << 1U); } while (new_size > new_capacity); pNew_buf = (mz_uint8*)MZ_REALLOC(p->m_pBuf, new_capacity); if (!pNew_buf) return MZ_FALSE; p->m_pBuf = pNew_buf; p->m_capacity = new_capacity; } memcpy((mz_uint8*)p->m_pBuf + p->m_size, pBuf, len); p->m_size = new_size; return MZ_TRUE; } void *tdefl_compress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags) { tdefl_output_buffer out_buf; MZ_CLEAR_OBJ(out_buf); if (!pOut_len) return MZ_FALSE; else *pOut_len = 0; out_buf.m_expandable = MZ_TRUE; if (!tdefl_compress_mem_to_output(pSrc_buf, src_buf_len, tdefl_output_buffer_putter, &out_buf, flags)) return NULL; *pOut_len = out_buf.m_size; return out_buf.m_pBuf; } size_t tdefl_compress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags) { tdefl_output_buffer out_buf; MZ_CLEAR_OBJ(out_buf); if (!pOut_buf) return 0; out_buf.m_pBuf = (mz_uint8*)pOut_buf; out_buf.m_capacity = out_buf_len; if (!tdefl_compress_mem_to_output(pSrc_buf, src_buf_len, tdefl_output_buffer_putter, &out_buf, flags)) return 0; return out_buf.m_size; } #ifdef _MSC_VER #pragma warning (push) #pragma warning (disable:4204) // nonstandard extension used : non-constant aggregate initializer (also supported by GNU C and C99, so no big deal) #endif // Simple PNG writer function by Alex Evans, 2011. Released into the public domain: https://gist.github.com/908299, more context at // http://altdevblogaday.org/2011/04/06/a-smaller-jpg-encoder/. // This is actually a modification of Alex's original code so PNG files generated by this function pass pngcheck. void *tdefl_write_image_to_png_file_in_memory_ex(const void *pImage, int w, int h, int num_chans, size_t *pLen_out, mz_uint level, mz_bool flip) { // Using a local copy of this array here in case MINIZ_NO_ZLIB_APIS was defined. static const mz_uint s_tdefl_png_num_probes[11] = { 0, 1, 6, 32, 16, 32, 128, 256, 512, 768, 1500 }; tdefl_compressor *pComp = (tdefl_compressor *)MZ_MALLOC(sizeof(tdefl_compressor)); tdefl_output_buffer out_buf; int i, bpl = w * num_chans, y, z; mz_uint32 c; *pLen_out = 0; if (!pComp) return NULL; MZ_CLEAR_OBJ(out_buf); out_buf.m_expandable = MZ_TRUE; out_buf.m_capacity = 57+MZ_MAX(64, (1+bpl)*h); if (NULL == (out_buf.m_pBuf = (mz_uint8*)MZ_MALLOC(out_buf.m_capacity))) { MZ_FREE(pComp); return NULL; } // write dummy header for (z = 41; z; --z) tdefl_output_buffer_putter(&z, 1, &out_buf); // compress image data tdefl_init(pComp, tdefl_output_buffer_putter, &out_buf, s_tdefl_png_num_probes[MZ_MIN(10, level)] | TDEFL_WRITE_ZLIB_HEADER); for (y = 0; y < h; ++y) { tdefl_compress_buffer(pComp, &z, 1, TDEFL_NO_FLUSH); tdefl_compress_buffer(pComp, (mz_uint8*)pImage + (flip ? (h - 1 - y) : y) * bpl, bpl, TDEFL_NO_FLUSH); } if (tdefl_compress_buffer(pComp, NULL, 0, TDEFL_FINISH) != TDEFL_STATUS_DONE) { MZ_FREE(pComp); MZ_FREE(out_buf.m_pBuf); return NULL; } // write real header *pLen_out = out_buf.m_size-41; { static const mz_uint8 chans[] = {0x00, 0x00, 0x04, 0x02, 0x06}; mz_uint8 pnghdr[41]={0x89,0x50,0x4e,0x47,0x0d,0x0a,0x1a,0x0a,0x00,0x00,0x00,0x0d,0x49,0x48,0x44,0x52, 0,0,(mz_uint8)(w>>8),(mz_uint8)w,0,0,(mz_uint8)(h>>8),(mz_uint8)h,8,chans[num_chans],0,0,0,0,0,0,0, (mz_uint8)(*pLen_out>>24),(mz_uint8)(*pLen_out>>16),(mz_uint8)(*pLen_out>>8),(mz_uint8)*pLen_out,0x49,0x44,0x41,0x54}; c=(mz_uint32)mz_crc32(MZ_CRC32_INIT,pnghdr+12,17); for (i=0; i<4; ++i, c<<=8) ((mz_uint8*)(pnghdr+29))[i]=(mz_uint8)(c>>24); memcpy(out_buf.m_pBuf, pnghdr, 41); } // write footer (IDAT CRC-32, followed by IEND chunk) if (!tdefl_output_buffer_putter("\0\0\0\0\0\0\0\0\x49\x45\x4e\x44\xae\x42\x60\x82", 16, &out_buf)) { *pLen_out = 0; MZ_FREE(pComp); MZ_FREE(out_buf.m_pBuf); return NULL; } c = (mz_uint32)mz_crc32(MZ_CRC32_INIT,out_buf.m_pBuf+41-4, *pLen_out+4); for (i=0; i<4; ++i, c<<=8) (out_buf.m_pBuf+out_buf.m_size-16)[i] = (mz_uint8)(c >> 24); // compute final size of file, grab compressed data buffer and return *pLen_out += 57; MZ_FREE(pComp); return out_buf.m_pBuf; } void *tdefl_write_image_to_png_file_in_memory(const void *pImage, int w, int h, int num_chans, size_t *pLen_out) { // Level 6 corresponds to TDEFL_DEFAULT_MAX_PROBES or MZ_DEFAULT_LEVEL (but we can't depend on MZ_DEFAULT_LEVEL being available in case the zlib API's where #defined out) return tdefl_write_image_to_png_file_in_memory_ex(pImage, w, h, num_chans, pLen_out, 6, MZ_FALSE); } #ifdef _MSC_VER #pragma warning (pop) #endif // ------------------- .ZIP archive reading // ------------------- .ZIP archive writing #ifdef __cplusplus } #endif #endif // MINIZ_HEADER_FILE_ONLY /* This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means. In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. For more information, please refer to */