diff options
Diffstat (limited to 'pdlzip.h')
| -rw-r--r-- | pdlzip.h | 79 |
1 files changed, 40 insertions, 39 deletions
@@ -1,5 +1,5 @@ -/* Pdlzip - A data compressor based on the LZMA algorithm - Copyright (C) 2010 Antonio Diaz Diaz. +/* Pdlzip - Data compressor based on the LZMA algorithm + Copyright (C) 2010, 2011 Antonio Diaz Diaz. This program is free software: you have unlimited permission to copy, distribute and modify it. @@ -69,6 +69,15 @@ static inline void CRC32_update_buf( uint32_t * crc, const uint8_t * const buffe } +static inline int real_bits( const int value ) + { + int bits = 0, i, mask; + for( i = 1, mask = 1; mask > 0; ++i, mask <<= 1 ) + if( value & mask ) bits = i; + return bits; + } + + static const uint8_t magic_string[4] = { 'L', 'Z', 'I', 'P' }; typedef uint8_t File_header[6]; /* 0-3 magic bytes */ @@ -76,52 +85,44 @@ typedef uint8_t File_header[6]; /* 0-3 magic bytes */ /* 5 coded_dict_size */ enum { Fh_size = 6 }; -static inline void Fh_set_magic( File_header header ) +static inline void Fh_set_magic( File_header data ) { - memcpy( header, magic_string, 4 ); - header[4] = 1; + memcpy( data, magic_string, 4 ); + data[4] = 1; } -static inline bool Fh_verify_magic( const File_header header ) +static inline bool Fh_verify_magic( const File_header data ) { - return ( memcmp( header, magic_string, 4 ) == 0 ); + return ( memcmp( data, magic_string, 4 ) == 0 ); } -static inline uint8_t Fh_version( const File_header header ) - { return header[4]; } +static inline uint8_t Fh_version( const File_header data ) + { return data[4]; } -static inline bool Fh_verify_version( const File_header header ) - { return ( header[4] <= 1 ); } - -static inline int Fh_real_bits( const int value ) - { - int bits = 0, i, mask; - for( i = 1, mask = 1; mask > 0; ++i, mask <<= 1 ) - if( value & mask ) bits = i; - return bits; - } +static inline bool Fh_verify_version( const File_header data ) + { return ( data[4] <= 1 ); } -static inline int Fh_get_dictionary_size( const File_header header ) +static inline int Fh_get_dictionary_size( const File_header data ) { - int sz = ( 1 << ( header[5] & 0x1F ) ); + int sz = ( 1 << ( data[5] & 0x1F ) ); if( sz > min_dictionary_size && sz <= max_dictionary_size ) - sz -= ( sz / 16 ) * ( ( header[5] >> 5 ) & 0x07 ); + sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 0x07 ); return sz; } -static inline bool Fh_set_dictionary_size( File_header header, const int sz ) +static inline bool Fh_set_dictionary_size( File_header data, const int sz ) { if( sz >= min_dictionary_size && sz <= max_dictionary_size ) { - header[5] = Fh_real_bits( sz - 1 ); + data[5] = real_bits( sz - 1 ); if( sz > min_dictionary_size ) { - const int base_size = 1 << header[5]; + const int base_size = 1 << data[5]; const int wedge = base_size / 16; int i; for( i = 7; i >= 1; --i ) if( base_size - ( i * wedge ) >= sz ) - { header[5] |= ( i << 5 ); break; } + { data[5] |= ( i << 5 ); break; } } return true; } @@ -139,51 +140,51 @@ 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 trailer ) +static inline uint32_t Ft_get_data_crc( const File_trailer data ) { uint32_t tmp = 0; int i; - for( i = 3; i >= 0; --i ) { tmp <<= 8; tmp += trailer[i]; } + for( i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; } return tmp; } -static inline void Ft_set_data_crc( File_trailer trailer, uint32_t crc ) +static inline void Ft_set_data_crc( File_trailer data, uint32_t crc ) { int i; - for( i = 0; i <= 3; ++i ) { trailer[i] = (uint8_t)crc; crc >>= 8; } + for( i = 0; i <= 3; ++i ) { data[i] = (uint8_t)crc; crc >>= 8; } } -static inline long long Ft_get_data_size( const File_trailer trailer ) +static inline long long Ft_get_data_size( const File_trailer data ) { long long tmp = 0; int i; - for( i = 11; i >= 4; --i ) { tmp <<= 8; tmp += trailer[i]; } + for( i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; } return tmp; } -static inline void Ft_set_data_size( File_trailer trailer, long long sz ) +static inline void Ft_set_data_size( File_trailer data, long long sz ) { int i; - for( i = 4; i <= 11; ++i ) { trailer[i] = (uint8_t)sz; sz >>= 8; } + for( i = 4; i <= 11; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } } -static inline long long Ft_get_member_size( const File_trailer trailer ) +static inline long long Ft_get_member_size( const File_trailer data ) { long long tmp = 0; int i; - for( i = 19; i >= 12; --i ) { tmp <<= 8; tmp += trailer[i]; } + for( i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; } return tmp; } -static inline void Ft_set_member_size( File_trailer trailer, long long sz ) +static inline void Ft_set_member_size( File_trailer data, long long sz ) { int i; - for( i = 12; i <= 19; ++i ) { trailer[i] = (uint8_t)sz; sz >>= 8; } + for( i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } } +/* defined in main.c */ extern int verbosity; -void cleanup_and_fail( const int retval ); void show_error( const char * const msg, const int errcode, const bool help ); void internal_error( const char * const msg ); |