diff options
Diffstat (limited to 'lzip.h')
| -rw-r--r-- | lzip.h | 173 |
1 files changed, 173 insertions, 0 deletions
@@ -0,0 +1,173 @@ +/* Xlunzip - Test tool for the lunzip linux module + Copyright (C) 2016-2018 Antonio Diaz Diaz. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 2 of the License, or + (at your option) any later version. + + 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. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#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 ); + +enum { + min_dictionary_bits = 12, + min_dictionary_size = 1 << min_dictionary_bits, + max_dictionary_bits = 29, + max_dictionary_size = 1 << max_dictionary_bits, + min_member_size = 36 }; + + +/* defined in main.c */ +extern int verbosity; + +struct Pretty_print + { + 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( len > pp->longest_name ) 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 ); + + +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 }; + +static inline bool Lh_verify_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 ) + { + int i; for( i = 0; i < sz && i < 4; ++i ) + if( data[i] != lzip_magic[i] ) return false; + return ( sz > 0 ); + } + +/* detect corrupt header */ +static inline bool Lh_verify_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 ); + } + +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 unsigned Lh_get_dictionary_size( const Lzip_header data ) + { + unsigned sz = ( 1 << ( data[5] & 0x1F ) ); + if( sz > min_dictionary_size ) + sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 7 ); + return sz; + } + + +typedef uint8_t Lzip_trailer[20]; + /* 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 ) + { + unsigned tmp = 0; + int i; for( i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; } + return tmp; + } + +static inline unsigned long long Lt_get_data_size( const Lzip_trailer data ) + { + unsigned long long tmp = 0; + int i; for( i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; } + return tmp; + } + +static inline unsigned long long Lt_get_member_size( const Lzip_trailer data ) + { + unsigned long long tmp = 0; + int i; for( i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; } + return tmp; + } + + +/* defined in in_place.c */ +int decompress_in_place( const int infd, struct Pretty_print * const pp, + const bool testing ); + +/* defined in main.c */ +int convert_retval( const int retval ); +long flush( void * buf, unsigned long size ); +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 ); |