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+/* Clzip - Data compressor based on the LZMA algorithm
+ Copyright (C) 2010, 2011, 2012, 2013 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 3 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
+
+typedef int State;
+
+enum { states = 12 };
+
+static inline bool St_is_char( const State st ) { return st < 7; }
+
+static inline State St_set_char( const State st )
+ {
+ static const State next[states] = { 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 };
+ return next[st];
+ }
+
+static inline State St_set_match( const State st )
+ { return ( ( st < 7 ) ? 7 : 10 ); }
+
+static inline State St_set_rep( const State st )
+ { return ( ( st < 7 ) ? 8 : 11 ); }
+
+static inline State St_set_short_rep( const State st )
+ { return ( ( st < 7 ) ? 9 : 11 ); }
+
+
+enum {
+ min_dictionary_bits = 12,
+ min_dictionary_size = 1 << min_dictionary_bits,
+ max_dictionary_bits = 29,
+ max_dictionary_size = 1 << max_dictionary_bits,
+ literal_context_bits = 3,
+ pos_state_bits = 2,
+ pos_states = 1 << pos_state_bits,
+ pos_state_mask = pos_states - 1,
+
+ dis_slot_bits = 6,
+ start_dis_model = 4,
+ end_dis_model = 14,
+ modeled_distances = 1 << (end_dis_model / 2), /* 128 */
+ dis_align_bits = 4,
+ dis_align_size = 1 << dis_align_bits,
+
+ len_low_bits = 3,
+ len_mid_bits = 3,
+ len_high_bits = 8,
+ len_low_symbols = 1 << len_low_bits,
+ len_mid_symbols = 1 << len_mid_bits,
+ len_high_symbols = 1 << len_high_bits,
+ max_len_symbols = len_low_symbols + len_mid_symbols + len_high_symbols,
+
+ min_match_len = 2, /* must be 2 */
+ max_match_len = min_match_len + max_len_symbols - 1, /* 273 */
+ min_match_len_limit = 5,
+
+ max_dis_states = 4 };
+
+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 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; }
+
+struct Len_model
+ {
+ Bit_model choice1;
+ Bit_model choice2;
+ Bit_model bm_low[pos_states][len_low_symbols];
+ Bit_model bm_mid[pos_states][len_mid_symbols];
+ Bit_model bm_high[len_high_symbols];
+ };
+
+static inline void Lm_init( struct Len_model * const lm )
+ {
+ Bm_init( &lm->choice1 );
+ Bm_init( &lm->choice2 );
+ Bm_array_init( lm->bm_low[0], pos_states * len_low_symbols );
+ Bm_array_init( lm->bm_mid[0], pos_states * len_mid_symbols );
+ Bm_array_init( lm->bm_high, len_high_symbols );
+ }
+
+
+struct Pretty_print
+ {
+ const char * name;
+ const char * stdin_name;
+ int longest_name;
+ int verbosity;
+ bool first_post;
+ };
+
+void Pp_init( struct Pretty_print * const pp, const char * const filenames[],
+ const int num_filenames, const int v );
+
+static inline void Pp_set_name( struct Pretty_print * const pp,
+ const char * const filename )
+ {
+ if( filename && filename[0] && strcmp( filename, "-" ) != 0 )
+ pp->name = filename;
+ else pp->name = pp->stdin_name;
+ 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;
+
+static inline void CRC32_init( void )
+ {
+ unsigned n;
+ for( n = 0; n < 256; ++n )
+ {
+ unsigned c = n;
+ int k;
+ for( k = 0; k < 8; ++k )
+ { if( c & 1 ) c = 0xEDB88320U ^ ( c >> 1 ); else c >>= 1; }
+ crc32[n] = c;
+ }
+ }
+
+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( unsigned value )
+ {
+ int bits = 0;
+ while( value > 0 ) { value >>= 1; ++bits; }
+ return bits;
+ }
+
+
+static const uint8_t magic_string[4] = { 0x4C, 0x5A, 0x49, 0x50 }; /* "LZIP" */
+
+typedef uint8_t File_header[6]; /* 0-3 magic bytes */
+ /* 4 version */
+ /* 5 coded_dict_size */
+enum { Fh_size = 6 };
+
+static inline void Fh_set_magic( File_header data )
+ { memcpy( data, magic_string, 4 ); data[4] = 1; }
+
+static inline bool Fh_verify_magic( const File_header data )
+ { return ( memcmp( data, magic_string, 4 ) == 0 ); }
+
+static inline uint8_t Fh_version( const File_header data )
+ { return data[4]; }
+
+static inline bool Fh_verify_version( const File_header data )
+ { return ( data[4] <= 1 ); }
+
+static inline unsigned Fh_get_dictionary_size( const File_header data )
+ {
+ unsigned sz = ( 1 << ( data[5] & 0x1F ) );
+ if( sz > min_dictionary_size )
+ sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 7 );
+ return sz;
+ }
+
+static inline bool Fh_set_dictionary_size( File_header data, const int sz )
+ {
+ if( sz >= min_dictionary_size && sz <= max_dictionary_size )
+ {
+ data[5] = real_bits( sz - 1 );
+ if( sz > min_dictionary_size )
+ {
+ 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 )
+ { data[5] |= ( i << 5 ); break; }
+ }
+ return true;
+ }
+ return false;
+ }
+
+
+typedef uint8_t File_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 { Ft_size = 20 };
+
+static inline int Ft_versioned_size( const int version )
+ { return ( ( version >= 1 ) ? 20 : 12 ); }
+
+static inline unsigned Ft_get_data_crc( const File_trailer data )
+ {
+ 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, unsigned crc )
+ {
+ int i;
+ for( i = 0; i <= 3; ++i ) { data[i] = (uint8_t)crc; crc >>= 8; }
+ }
+
+static inline unsigned long long Ft_get_data_size( const File_trailer data )
+ {
+ 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, unsigned long long sz )
+ {
+ int i;
+ for( i = 4; i <= 11; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; }
+ }
+
+static inline unsigned long long Ft_get_member_size( const File_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 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; }
+ }
+
+
+/* defined in decoder.c */
+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 internal_error( const char * const msg );