diff options
Diffstat (limited to 'lzip.h')
| -rw-r--r-- | lzip.h | 139 |
1 files changed, 37 insertions, 102 deletions
@@ -1,36 +1,31 @@ -/* Pdlzip - LZMA lossless data compressor - Copyright (C) 2010-2019 Antonio Diaz Diaz. +/* Pdlzip - LZMA lossless data compressor + Copyright (C) 2010-2024 Antonio Diaz Diaz. - This program is free software. Redistribution and use in source and - binary forms, with or without modification, are permitted provided - that the following conditions are met: + This program is free software. Redistribution and use in source and + binary forms, with or without modification, are permitted provided + that the following conditions are met: - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions, and the following disclaimer. - 2. Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in the - documentation and/or other materials provided with the distribution. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions, and the following disclaimer in the + documentation and/or other materials provided with the distribution. - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef max #define max(x,y) ((x) >= (y) ? (x) : (y)) #endif -#ifndef min - #define min(x,y) ((x) <= (y) ? (x) : (y)) -#endif - -void * resize_buffer( void * buf, const unsigned min_size ); typedef int State; enum { min_dictionary_bits = 12, - min_dictionary_size = 1 << min_dictionary_bits, + min_dictionary_size = 1 << min_dictionary_bits, /* >= modeled_distances */ max_dictionary_bits = 29, max_dictionary_size = 1 << max_dictionary_bits, max_dictionary_bits_c = 27, /* kDicLogSizeMaxCompress */ @@ -52,65 +47,6 @@ enum { min_match_len_limit = 5 }; -/* defined in main.c */ -extern int verbosity; - -struct Pretty_print /* requires global var 'int verbosity' */ - { - const char * name; - char * padded_name; - const char * stdin_name; - unsigned longest_name; - bool first_post; - }; - -static inline void Pp_init( struct Pretty_print * const pp, - const char * const filenames[], - const int num_filenames ) - { - unsigned stdin_name_len; - int i; - pp->name = 0; - pp->padded_name = 0; - pp->stdin_name = "(stdin)"; - pp->longest_name = 0; - pp->first_post = false; - - if( verbosity <= 0 ) return; - stdin_name_len = strlen( pp->stdin_name ); - for( i = 0; i < num_filenames; ++i ) - { - const char * const s = filenames[i]; - const unsigned len = (strcmp( s, "-" ) == 0) ? stdin_name_len : strlen( s ); - if( pp->longest_name < len ) pp->longest_name = len; - } - if( pp->longest_name == 0 ) pp->longest_name = stdin_name_len; - } - -static inline void Pp_set_name( struct Pretty_print * const pp, - const char * const filename ) - { - unsigned name_len, padded_name_len, i = 0; - - if( filename && filename[0] && strcmp( filename, "-" ) != 0 ) - pp->name = filename; - else pp->name = pp->stdin_name; - name_len = strlen( pp->name ); - padded_name_len = max( name_len, pp->longest_name ) + 4; - pp->padded_name = resize_buffer( pp->padded_name, padded_name_len + 1 ); - while( i < 2 ) pp->padded_name[i++] = ' '; - while( i < name_len + 2 ) { pp->padded_name[i] = pp->name[i-2]; ++i; } - pp->padded_name[i++] = ':'; - while( i < padded_name_len ) pp->padded_name[i++] = ' '; - pp->padded_name[i] = 0; - pp->first_post = true; - } - -static inline void Pp_reset( struct Pretty_print * const pp ) - { if( pp->name && pp->name[0] ) pp->first_post = true; } -void Pp_show_msg( struct Pretty_print * const pp, const char * const msg ); - - typedef uint32_t CRC32[256]; /* Table of CRCs of all 8-bit messages. */ extern CRC32 crc32; @@ -128,6 +64,7 @@ static inline void CRC32_init( void ) } } +/* about as fast as it is possible without messing with endianness */ static inline void CRC32_update_buf( uint32_t * const crc, const uint8_t * const buffer, const int size ) @@ -141,8 +78,8 @@ static inline void CRC32_update_buf( uint32_t * const crc, static inline bool isvalid_ds( const unsigned dictionary_size ) - { return ( dictionary_size >= min_dictionary_size && - dictionary_size <= max_dictionary_size ); } + { return dictionary_size >= min_dictionary_size && + dictionary_size <= max_dictionary_size; } static inline int real_bits( unsigned value ) @@ -155,43 +92,43 @@ static inline int real_bits( unsigned value ) static const uint8_t lzip_magic[4] = { 0x4C, 0x5A, 0x49, 0x50 }; /* "LZIP" */ -typedef uint8_t Lzip_header[6]; /* 0-3 magic bytes */ - /* 4 version */ - /* 5 coded_dict_size */ enum { Lh_size = 6 }; +typedef uint8_t Lzip_header[Lh_size]; /* 0-3 magic bytes */ + /* 4 version */ + /* 5 coded dictionary size */ static inline void Lh_set_magic( Lzip_header data ) { memcpy( data, lzip_magic, 4 ); data[4] = 1; } -static inline bool Lh_verify_magic( const Lzip_header data ) - { return ( memcmp( data, lzip_magic, 4 ) == 0 ); } +static inline bool Lh_check_magic( const Lzip_header data ) + { return memcmp( data, lzip_magic, 4 ) == 0; } /* detect (truncated) header */ -static inline bool Lh_verify_prefix( const Lzip_header data, const int sz ) +static inline bool Lh_check_prefix( const Lzip_header data, const int sz ) { int i; for( i = 0; i < sz && i < 4; ++i ) if( data[i] != lzip_magic[i] ) return false; - return ( sz > 0 ); + return sz > 0; } /* detect corrupt header */ -static inline bool Lh_verify_corrupt( const Lzip_header data ) +static inline bool Lh_check_corrupt( const Lzip_header data ) { int matches = 0; int i; for( i = 0; i < 4; ++i ) if( data[i] == lzip_magic[i] ) ++matches; - return ( matches > 1 && matches < 4 ); + return matches > 1 && matches < 4; } static inline uint8_t Lh_version( const Lzip_header data ) { return data[4]; } -static inline bool Lh_verify_version( const Lzip_header data ) - { return ( data[4] == 1 ); } +static inline bool Lh_check_version( const Lzip_header data ) + { return data[4] == 1; } static inline unsigned Lh_get_dictionary_size( const Lzip_header data ) { - unsigned sz = ( 1 << ( data[5] & 0x1F ) ); + unsigned sz = 1 << ( data[5] & 0x1F ); if( sz > min_dictionary_size ) sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 7 ); return sz; @@ -208,17 +145,17 @@ static inline bool Lh_set_dictionary_size( Lzip_header data, const unsigned sz ) unsigned i; for( i = 7; i >= 1; --i ) if( base_size - ( i * fraction ) >= sz ) - { data[5] |= ( i << 5 ); break; } + { data[5] |= i << 5; break; } } return true; } -typedef uint8_t Lzip_trailer[20]; +enum { Lt_size = 20 }; +typedef uint8_t Lzip_trailer[Lt_size]; /* 0-3 CRC32 of the uncompressed data */ /* 4-11 size of the uncompressed data */ /* 12-19 member size including header and trailer */ -enum { Lt_size = 20 }; static inline unsigned Lt_get_data_crc( const Lzip_trailer data ) { @@ -251,19 +188,17 @@ static inline void Lt_set_member_size( Lzip_trailer data, unsigned long long sz { int i; for( i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } } +static inline void set_retval( int * retval, const int new_val ) + { if( *retval < new_val ) *retval = new_val; } + static const char * const trailing_msg = "Trailing data not allowed."; +static const char * const mem_msg = "Not enough memory."; /* defined in main.c */ +extern int verbosity; int readblock( const int fd, uint8_t * const buf, const int size ); int writeblock( const int fd, const uint8_t * const buf, const int size ); -/* defined in main.c */ -void cleanup_and_fail( const int retval ); -void show_error( const char * const msg, const int errcode, const bool help ); -void show_file_error( const char * const filename, const char * const msg, - const int errcode ); -void internal_error( const char * const msg ); - #define SZ_OK 0 #define SZ_ERROR_READ 8 |