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-rw-r--r--decoder.c119
1 files changed, 61 insertions, 58 deletions
diff --git a/decoder.c b/decoder.c
index 15ede6c..96d608a 100644
--- a/decoder.c
+++ b/decoder.c
@@ -1,5 +1,5 @@
/* Clzip - LZMA lossless data compressor
- Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
+ Copyright (C) 2010, 2011, 2012, 2013, 2014 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
@@ -62,7 +62,7 @@ int readblock( const int fd, uint8_t * const buf, const int size )
const int n = read( fd, buf + size - rest, rest );
if( n > 0 ) rest -= n;
else if( n == 0 ) break; /* EOF */
- else if( errno != EINTR && errno != EAGAIN ) break;
+ else if( errno != EINTR ) break;
errno = 0;
}
return size - rest;
@@ -80,7 +80,7 @@ int writeblock( const int fd, const uint8_t * const buf, const int size )
{
const int n = write( fd, buf + size - rest, rest );
if( n > 0 ) rest -= n;
- else if( n < 0 && errno != EINTR && errno != EAGAIN ) break;
+ else if( n < 0 && errno != EINTR ) break;
errno = 0;
}
return size - rest;
@@ -102,31 +102,33 @@ bool Rd_read_block( struct Range_decoder * const rdec )
}
-void LZd_flush_data( struct LZ_decoder * const decoder )
+void LZd_flush_data( struct LZ_decoder * const d )
{
- if( decoder->pos > decoder->stream_pos )
+ if( d->pos > d->stream_pos )
{
- const int size = decoder->pos - decoder->stream_pos;
- CRC32_update_buf( &decoder->crc, decoder->buffer + decoder->stream_pos, size );
- if( decoder->outfd >= 0 &&
- writeblock( decoder->outfd, decoder->buffer + decoder->stream_pos, size ) != size )
+ const int size = d->pos - d->stream_pos;
+ CRC32_update_buf( &d->crc, d->buffer + d->stream_pos, size );
+ if( d->outfd >= 0 &&
+ writeblock( d->outfd, d->buffer + d->stream_pos, size ) != size )
{ show_error( "Write error", errno, false ); cleanup_and_fail( 1 ); }
- if( decoder->pos >= decoder->buffer_size )
- { decoder->partial_data_pos += decoder->pos; decoder->pos = 0; }
- decoder->stream_pos = decoder->pos;
+ if( d->pos >= d->buffer_size )
+ { d->partial_data_pos += d->pos; d->pos = 0; }
+ d->stream_pos = d->pos;
}
}
-bool LZd_verify_trailer( struct LZ_decoder * const decoder,
- struct Pretty_print * const pp )
+static bool LZd_verify_trailer( struct LZ_decoder * const d,
+ struct Pretty_print * const pp )
{
File_trailer trailer;
- const unsigned long long member_size =
- Rd_member_position( decoder->rdec ) + Ft_size;
+ const unsigned long long member_size = Rd_member_position( d->rdec ) + Ft_size;
+ unsigned long long trailer_data_size;
+ unsigned long long trailer_member_size;
+ unsigned trailer_crc;
bool error = false;
- int size = Rd_read_data( decoder->rdec, trailer, Ft_size );
+ int size = Rd_read_data( d->rdec, trailer, Ft_size );
if( size < Ft_size )
{
error = true;
@@ -139,60 +141,62 @@ bool LZd_verify_trailer( struct LZ_decoder * const decoder,
while( size < Ft_size ) trailer[size++] = 0;
}
- if( decoder->rdec->code != 0 )
+ if( d->rdec->code != 0 )
{
error = true;
Pp_show_msg( pp, "Range decoder final code is not zero" );
}
- if( Ft_get_data_crc( trailer ) != LZd_crc( decoder ) )
+ trailer_crc = Ft_get_data_crc( trailer );
+ if( trailer_crc != LZd_crc( d ) )
{
error = true;
if( verbosity >= 0 )
{
Pp_show_msg( pp, 0 );
fprintf( stderr, "CRC mismatch; trailer says %08X, data CRC is %08X.\n",
- Ft_get_data_crc( trailer ), LZd_crc( decoder ) );
+ trailer_crc, LZd_crc( d ) );
}
}
- if( Ft_get_data_size( trailer ) != LZd_data_position( decoder ) )
+ trailer_data_size = Ft_get_data_size( trailer );
+ if( trailer_data_size != LZd_data_position( d ) )
{
error = true;
if( verbosity >= 0 )
{
Pp_show_msg( pp, 0 );
fprintf( stderr, "Data size mismatch; trailer says %llu, data size is %llu (0x%llX).\n",
- Ft_get_data_size( trailer ), LZd_data_position( decoder ), LZd_data_position( decoder ) );
+ trailer_data_size, LZd_data_position( d ), LZd_data_position( d ) );
}
}
- if( Ft_get_member_size( trailer ) != member_size )
+ trailer_member_size = Ft_get_member_size( trailer );
+ if( trailer_member_size != member_size )
{
error = true;
if( verbosity >= 0 )
{
Pp_show_msg( pp, 0 );
fprintf( stderr, "Member size mismatch; trailer says %llu, member size is %llu (0x%llX).\n",
- Ft_get_member_size( trailer ), member_size, member_size );
+ trailer_member_size, member_size, member_size );
}
}
- if( !error && verbosity >= 2 && LZd_data_position( decoder ) > 0 && member_size > 0 )
+ if( !error && verbosity >= 2 && LZd_data_position( d ) > 0 && member_size > 0 )
fprintf( stderr, "%6.3f:1, %6.3f bits/byte, %5.2f%% saved. ",
- (double)LZd_data_position( decoder ) / member_size,
- ( 8.0 * member_size ) / LZd_data_position( decoder ),
- 100.0 * ( 1.0 - ( (double)member_size / LZd_data_position( decoder ) ) ) );
+ (double)LZd_data_position( d ) / member_size,
+ ( 8.0 * member_size ) / LZd_data_position( d ),
+ 100.0 * ( 1.0 - ( (double)member_size / LZd_data_position( d ) ) ) );
if( !error && verbosity >= 4 )
fprintf( stderr, "data CRC %08X, data size %9llu, member size %8llu. ",
- Ft_get_data_crc( trailer ),
- Ft_get_data_size( trailer ), Ft_get_member_size( trailer ) );
+ trailer_crc, trailer_data_size, trailer_member_size );
return !error;
}
/* Return value: 0 = OK, 1 = decoder error, 2 = unexpected EOF,
3 = trailer error, 4 = unknown marker found. */
-int LZd_decode_member( struct LZ_decoder * const decoder,
+int LZd_decode_member( struct LZ_decoder * const d,
struct Pretty_print * const pp )
{
- struct Range_decoder * const rdec = decoder->rdec;
+ struct Range_decoder * const rdec = d->rdec;
unsigned rep0 = 0; /* rep[0-3] latest four distances */
unsigned rep1 = 0; /* used for efficient coding of */
unsigned rep2 = 0; /* repeated distances */
@@ -202,37 +206,37 @@ int LZd_decode_member( struct LZ_decoder * const decoder,
Rd_load( rdec );
while( !Rd_finished( rdec ) )
{
- const int pos_state = LZd_data_position( decoder ) & pos_state_mask;
- if( Rd_decode_bit( rdec, &decoder->bm_match[state][pos_state] ) == 0 ) /* 1st bit */
+ const int pos_state = LZd_data_position( d ) & pos_state_mask;
+ if( Rd_decode_bit( rdec, &d->bm_match[state][pos_state] ) == 0 ) /* 1st bit */
{
- const uint8_t prev_byte = LZd_get_prev_byte( decoder );
+ const uint8_t prev_byte = LZd_get_prev_byte( d );
if( St_is_char( state ) )
{
state -= ( state < 4 ) ? state : 3;
- LZd_put_byte( decoder, Rd_decode_tree( rdec,
- decoder->bm_literal[get_lit_state(prev_byte)], 8 ) );
+ LZd_put_byte( d, Rd_decode_tree( rdec,
+ d->bm_literal[get_lit_state(prev_byte)], 8 ) );
}
else
{
state -= ( state < 10 ) ? 3 : 6;
- LZd_put_byte( decoder, Rd_decode_matched( rdec,
- decoder->bm_literal[get_lit_state(prev_byte)],
- LZd_get_byte( decoder, rep0 ) ) );
+ LZd_put_byte( d, Rd_decode_matched( rdec,
+ d->bm_literal[get_lit_state(prev_byte)],
+ LZd_get_byte( d, rep0 ) ) );
}
}
else
{
int len;
- if( Rd_decode_bit( rdec, &decoder->bm_rep[state] ) != 0 ) /* 2nd bit */
+ if( Rd_decode_bit( rdec, &d->bm_rep[state] ) != 0 ) /* 2nd bit */
{
- if( Rd_decode_bit( rdec, &decoder->bm_rep0[state] ) != 0 ) /* 3rd bit */
+ if( Rd_decode_bit( rdec, &d->bm_rep0[state] ) != 0 ) /* 3rd bit */
{
unsigned distance;
- if( Rd_decode_bit( rdec, &decoder->bm_rep1[state] ) == 0 ) /* 4th bit */
+ if( Rd_decode_bit( rdec, &d->bm_rep1[state] ) == 0 ) /* 4th bit */
distance = rep1;
else
{
- if( Rd_decode_bit( rdec, &decoder->bm_rep2[state] ) == 0 ) /* 5th bit */
+ if( Rd_decode_bit( rdec, &d->bm_rep2[state] ) == 0 ) /* 5th bit */
distance = rep2;
else
{ distance = rep3; rep3 = rep2; }
@@ -243,19 +247,19 @@ int LZd_decode_member( struct LZ_decoder * const decoder,
}
else
{
- if( Rd_decode_bit( rdec, &decoder->bm_len[state][pos_state] ) == 0 ) /* 4th bit */
+ if( Rd_decode_bit( rdec, &d->bm_len[state][pos_state] ) == 0 ) /* 4th bit */
{ state = St_set_short_rep( state );
- LZd_put_byte( decoder, LZd_get_byte( decoder, rep0 ) ); continue; }
+ LZd_put_byte( d, LZd_get_byte( d, rep0 ) ); continue; }
}
state = St_set_rep( state );
- len = min_match_len + Rd_decode_len( rdec, &decoder->rep_len_model, pos_state );
+ len = min_match_len + Rd_decode_len( rdec, &d->rep_len_model, pos_state );
}
else
{
int dis_slot;
const unsigned rep0_saved = rep0;
- len = min_match_len + Rd_decode_len( rdec, &decoder->match_len_model, pos_state );
- dis_slot = Rd_decode_tree6( rdec, decoder->bm_dis_slot[get_len_state(len)] );
+ len = min_match_len + Rd_decode_len( rdec, &d->match_len_model, pos_state );
+ dis_slot = Rd_decode_tree6( rdec, d->bm_dis_slot[get_len_state(len)] );
if( dis_slot < start_dis_model ) rep0 = dis_slot;
else
{
@@ -263,19 +267,19 @@ int LZd_decode_member( struct LZ_decoder * const decoder,
rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
if( dis_slot < end_dis_model )
rep0 += Rd_decode_tree_reversed( rdec,
- decoder->bm_dis + rep0 - dis_slot - 1, direct_bits );
+ d->bm_dis + rep0 - dis_slot - 1, direct_bits );
else
{
rep0 += Rd_decode( rdec, direct_bits - dis_align_bits ) << dis_align_bits;
- rep0 += Rd_decode_tree_reversed4( rdec, decoder->bm_align );
+ rep0 += Rd_decode_tree_reversed4( rdec, d->bm_align );
if( rep0 == 0xFFFFFFFFU ) /* Marker found */
{
rep0 = rep0_saved;
Rd_normalize( rdec );
- LZd_flush_data( decoder );
+ LZd_flush_data( d );
if( len == min_match_len ) /* End Of Stream marker */
{
- if( LZd_verify_trailer( decoder, pp ) ) return 0; else return 3;
+ if( LZd_verify_trailer( d, pp ) ) return 0; else return 3;
}
if( len == min_match_len + 1 ) /* Sync Flush marker */
{
@@ -292,13 +296,12 @@ int LZd_decode_member( struct LZ_decoder * const decoder,
}
rep3 = rep2; rep2 = rep1; rep1 = rep0_saved;
state = St_set_match( state );
- if( rep0 >= (unsigned)decoder->dictionary_size ||
- ( rep0 >= (unsigned)decoder->pos && !decoder->partial_data_pos ) )
- { LZd_flush_data( decoder ); return 1; }
+ if( rep0 >= d->dictionary_size || rep0 >= LZd_data_position( d ) )
+ { LZd_flush_data( d ); return 1; }
}
- LZd_copy_block( decoder, rep0, len );
+ LZd_copy_block( d, rep0, len );
}
}
- LZd_flush_data( decoder );
+ LZd_flush_data( d );
return 2;
}