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Diffstat (limited to '')
| -rw-r--r-- | lzip.h | 93 |
1 files changed, 93 insertions, 0 deletions
@@ -0,0 +1,93 @@ +/* Xlunzip - Test tool for the lzip_decompress linux module + Copyright (C) 2016-2021 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 + +enum { + min_dictionary_bits = 12, + min_dictionary_size = 1 << min_dictionary_bits, /* >= modeled_distances */ + max_dictionary_bits = 29, + max_dictionary_size = 1 << max_dictionary_bits, + min_member_size = 36 }; + + +struct Pretty_print + { + const char * name; + char * padded_name; + const char * stdin_name; + unsigned longest_name; + bool first_post; + }; + + +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 dictionary size */ +enum { Lh_size = 6 }; + +static inline bool Lh_verify_magic( const Lzip_header data ) + { return ( memcmp( data, lzip_magic, 4 ) == 0 ); } + +static inline bool Lh_verify_version( const Lzip_header data ) + { return ( data[4] == 1 ); } + + +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 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; + } + + +static inline void set_retval( int * retval, const int new_val ) + { if( *retval < new_val ) *retval = new_val; } + +static const char * const mem_msg = "Not enough memory."; + +/* 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_results( struct Pretty_print * const pp, const long in_pos, + const long out_pos, const bool testing ); +void show_file_error( const char * const filename, const char * const msg, + const int errcode ); |