diff options
Diffstat (limited to '')
| -rw-r--r-- | clzip.h | 148 |
1 files changed, 98 insertions, 50 deletions
@@ -1,5 +1,5 @@ /* Lzlib - A compression library for lzip files - Copyright (C) 2009, 2010, 2011, 2012 Antonio Diaz Diaz. + Copyright (C) 2009, 2010, 2011, 2012, 2013 Antonio Diaz Diaz. This library is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -32,39 +32,26 @@ #define min(x,y) ((x) <= (y) ? (x) : (y)) #endif -typedef uint8_t State; +typedef int State; enum { states = 12 }; static inline bool St_is_char( const State st ) { return st < 7; } -static inline void St_set_char( State * const st ) +static inline State St_set_char( const State st ) { - static const uint8_t next[states] = - { 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 }; - *st = next[*st]; + static const State next[states] = { 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 }; + return next[st]; } -static inline void St_set_match( State * const st ) - { - static const uint8_t next[states] = - { 7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10 }; - *st = next[*st]; - } +static inline State St_set_match( const State st ) + { return ( ( st < 7 ) ? 7 : 10 ); } -static inline void St_set_rep( State * const st ) - { - static const uint8_t next[states] = - { 8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11 }; - *st = next[*st]; - } +static inline State St_set_rep( const State st ) + { return ( ( st < 7 ) ? 8 : 11 ); } -static inline void St_set_short_rep( State * const st ) - { - static const uint8_t next[states] = - { 9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11 }; - *st = next[*st]; - } +static inline State St_set_short_rep( const State st ) + { return ( ( st < 7 ) ? 9 : 11 ); } enum { @@ -80,7 +67,7 @@ enum { dis_slot_bits = 6, start_dis_model = 4, end_dis_model = 14, - modeled_distances = 1 << (end_dis_model / 2), + modeled_distances = 1 << (end_dis_model / 2), /* 128 */ dis_align_bits = 4, dis_align_size = 1 << dis_align_bits, @@ -98,34 +85,95 @@ enum { max_dis_states = 4 }; -static inline int get_dis_state( int len ) - { - len -= min_match_len; - if( len >= max_dis_states ) len = max_dis_states - 1; - return len; - } +static inline int get_dis_state( const int len ) + { return min( len - min_match_len, max_dis_states - 1 ); } + +static inline int get_lit_state( const uint8_t prev_byte ) + { return ( prev_byte >> ( 8 - literal_context_bits ) ); } enum { bit_model_move_bits = 5, bit_model_total_bits = 11, bit_model_total = 1 << bit_model_total_bits }; -typedef unsigned int Bit_model; +typedef int Bit_model; static inline void Bm_init( Bit_model * const probability ) { *probability = bit_model_total / 2; } +static inline void Bm_array_init( Bit_model * const p, const int size ) + { int i = 0; while( i < size ) p[i++] = bit_model_total / 2; } + + +/* Table of CRCs of all 8-bit messages. */ +static const uint32_t crc32[256] = + { + 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, + 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, + 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, + 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, + 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, + 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, + 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, + 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, + 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, + 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, + 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, + 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, + 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, + 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, + 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, + 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, + 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, + 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, + 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, + 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, + 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, + 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, + 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, + 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, + 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, + 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, + 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, + 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, + 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, + 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, + 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, + 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, + 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, + 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, + 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, + 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, + 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, + 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, + 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, + 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, + 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, + 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, + 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D }; + + +static inline void CRC32_update_byte( uint32_t * const crc, const uint8_t byte ) + { *crc = crc32[(*crc^byte)&0xFF] ^ ( *crc >> 8 ); } + +static inline void CRC32_update_buf( uint32_t * const crc, + const uint8_t * const buffer, const int size ) + { + int i; + for( i = 0; i < size; ++i ) + *crc = crc32[(*crc^buffer[i])&0xFF] ^ ( *crc >> 8 ); + } + -static inline int real_bits( const unsigned int value ) +static inline int real_bits( unsigned value ) { - int bits = 0, i = 1; - unsigned int mask = 1; - for( ; mask > 0; ++i, mask <<= 1 ) if( value & mask ) bits = i; + int bits = 0; + while( value > 0 ) { value >>= 1; ++bits; } return bits; } -static const uint8_t magic_string[4] = { 'L', 'Z', 'I', 'P' }; +static const uint8_t magic_string[4] = { 0x4C, 0x5A, 0x49, 0x50 }; /* "LZIP" */ typedef uint8_t File_header[6]; /* 0-3 magic bytes */ /* 4 version */ @@ -144,11 +192,11 @@ static inline uint8_t Fh_version( const File_header data ) static inline bool Fh_verify_version( const File_header data ) { return ( data[4] <= 1 ); } -static inline int Fh_get_dictionary_size( const File_header data ) +static inline unsigned Fh_get_dictionary_size( const File_header data ) { - int sz = ( 1 << ( data[5] & 0x1F ) ); - if( sz > min_dictionary_size && sz <= max_dictionary_size ) - sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 0x07 ); + unsigned sz = ( 1 << ( data[5] & 0x1F ) ); + if( sz > min_dictionary_size ) + sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 7 ); return sz; } @@ -189,43 +237,43 @@ enum { Ft_size = 20 }; static inline int Ft_versioned_size( const int version ) { return ( ( version >= 1 ) ? 20 : 12 ); } -static inline uint32_t Ft_get_data_crc( const File_trailer data ) +static inline unsigned Ft_get_data_crc( const File_trailer data ) { - uint32_t tmp = 0; + unsigned tmp = 0; int i; for( i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; } return tmp; } -static inline void Ft_set_data_crc( File_trailer data, uint32_t crc ) +static inline void Ft_set_data_crc( File_trailer data, unsigned crc ) { int i; for( i = 0; i <= 3; ++i ) { data[i] = (uint8_t)crc; crc >>= 8; } } -static inline long long Ft_get_data_size( const File_trailer data ) +static inline unsigned long long Ft_get_data_size( const File_trailer data ) { - long long tmp = 0; + unsigned long long tmp = 0; int i; for( i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; } return tmp; } -static inline void Ft_set_data_size( File_trailer data, long long sz ) +static inline void Ft_set_data_size( File_trailer data, unsigned long long sz ) { int i; for( i = 4; i <= 11; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } } -static inline long long Ft_get_member_size( const File_trailer data ) +static inline unsigned long long Ft_get_member_size( const File_trailer data ) { - long long tmp = 0; + unsigned long long tmp = 0; int i; for( i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; } return tmp; } -static inline void Ft_set_member_size( File_trailer data, long long sz ) +static inline void Ft_set_member_size( File_trailer data, unsigned long long sz ) { int i; for( i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } |