summaryrefslogtreecommitdiffstats
path: root/lzip.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2017-05-09 06:25:01 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2017-05-09 06:25:01 +0000
commitc90b625fd88ff9eb14e1107fd52f833bbe871813 (patch)
tree0f85968e5cefb482ad0e474190a22209b11bec83 /lzip.h
parentInitial commit. (diff)
downloadpdlzip-c90b625fd88ff9eb14e1107fd52f833bbe871813.zip
pdlzip-c90b625fd88ff9eb14e1107fd52f833bbe871813.tar.xz
Adding upstream version 1.8.upstream/1.8
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lzip.h')
-rw-r--r--lzip.h246
1 files changed, 246 insertions, 0 deletions
diff --git a/lzip.h b/lzip.h
new file mode 100644
index 0000000..631599d
--- /dev/null
+++ b/lzip.h
@@ -0,0 +1,246 @@
+/* Pdlzip - LZMA lossless data compressor
+ Copyright (C) 2010-2017 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:
+
+ 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.
+
+ 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
+
+typedef int State;
+
+enum {
+ min_dictionary_bits = 12,
+ min_dictionary_size = 1 << min_dictionary_bits,
+ max_dictionary_bits = 29,
+ max_dictionary_size = 1 << max_dictionary_bits,
+ max_dictionary_bits_c = 27, /* kDicLogSizeMaxCompress */
+ max_dictionary_size_c = 1 << max_dictionary_bits_c,
+ literal_context_bits = 3,
+ literal_pos_state_bits = 0, /* not used */
+ pos_state_bits = 2,
+
+ 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 };
+
+
+struct Pretty_print
+ {
+ const char * 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, const int verbosity )
+ {
+ unsigned stdin_name_len;
+ int i;
+ pp->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 )
+ {
+ 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_buf( uint32_t * const crc,
+ const uint8_t * const buffer,
+ const int size )
+ {
+ int i;
+ uint32_t c = *crc;
+ for( i = 0; i < size; ++i )
+ c = crc32[(c^buffer[i])&0xFF] ^ ( c >> 8 );
+ *crc = c;
+ }
+
+
+static inline bool isvalid_ds( const unsigned dictionary_size )
+ { return ( dictionary_size >= min_dictionary_size &&
+ dictionary_size <= max_dictionary_size ); }
+
+
+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 ); }
+
+/* detect truncated header */
+static inline bool Fh_verify_prefix( const File_header data, const int size )
+ {
+ int i; for( i = 0; i < size && i < 4; ++i )
+ if( data[i] != magic_string[i] ) return false;
+ return ( size > 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 unsigned sz )
+ {
+ if( !isvalid_ds( sz ) ) return false;
+ data[5] = real_bits( sz - 1 );
+ if( sz > min_dictionary_size )
+ {
+ const unsigned base_size = 1 << data[5];
+ const unsigned fraction = base_size / 16;
+ unsigned i;
+ for( i = 7; i >= 1; --i )
+ if( base_size - ( i * fraction ) >= sz )
+ { data[5] |= ( i << 5 ); break; }
+ }
+ return true;
+ }
+
+
+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 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; } }
+
+
+static const char * const trailing_msg = "Trailing data not allowed.";
+
+/* defined in main.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 */
+extern int verbosity;
+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
+#define SZ_ERROR_WRITE 9