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-rw-r--r--decoder.c84
1 files changed, 45 insertions, 39 deletions
diff --git a/decoder.c b/decoder.c
index 20799a3..0d00219 100644
--- a/decoder.c
+++ b/decoder.c
@@ -28,15 +28,18 @@
#include "decoder.h"
-bool Ib_read_block( struct Input_buffer * const ibuf )
+bool Rd_read_block( struct Range_decoder * const rdec )
{
- if( ibuf->at_stream_end ) return false;
- ibuf->stream_pos = readblock( ibuf->infd_, ibuf->buffer, Ib_buffer_size );
- if( ibuf->stream_pos != Ib_buffer_size && errno )
- { show_error( "read error", errno, false ); cleanup_and_fail( 1 ); }
- ibuf->pos = 0;
- ibuf->at_stream_end = ( ibuf->stream_pos < Ib_buffer_size );
- return !Ib_finished( ibuf );
+ if( !rdec->at_stream_end )
+ {
+ rdec->stream_pos = readblock( rdec->infd_, rdec->buffer, Rd_buffer_size );
+ if( rdec->stream_pos != Rd_buffer_size && errno )
+ { show_error( "read error", errno, false ); cleanup_and_fail( 1 ); }
+ rdec->at_stream_end = ( rdec->stream_pos < Rd_buffer_size );
+ rdec->partial_member_pos += rdec->pos;
+ rdec->pos = 0;
+ }
+ return !Rd_finished( rdec );
}
@@ -59,13 +62,15 @@ void LZd_flush_data( struct LZ_decoder * const decoder )
bool LZd_verify_trailer( struct LZ_decoder * const decoder,
struct Pretty_print * const pp )
{
- bool error = false;
File_trailer trailer;
- const int trailer_size = Ft_size( decoder->format_version );
+ const int trailer_size = Ft_versioned_size( decoder->format_version );
+ const long long member_size = LZd_member_position( decoder ) + trailer_size;
+ bool error = false;
+
for( int i = 0; i < trailer_size && !error; ++i )
{
- if( !Rd_finished( &decoder->range_decoder ) )
- trailer[i] = Rd_get_byte( &decoder->range_decoder );
+ if( !Rd_finished( decoder->range_decoder ) )
+ trailer[i] = Rd_get_byte( decoder->range_decoder );
else
{
error = true;
@@ -73,13 +78,13 @@ bool LZd_verify_trailer( struct LZ_decoder * const decoder,
{
Pp_show_msg( pp, 0 );
fprintf( stderr, "trailer truncated at trailer position %d;"
- " some checks may fail.\n", i );
+ " some checks may fail.\n", i );
}
+ for( ; i < trailer_size; ++i ) trailer[i] = 0;
}
}
- if( decoder->format_version == 0 )
- Ft_set_member_size( trailer, LZd_member_position( decoder ) );
- if( !Rd_code_is_zero( &decoder->range_decoder ) )
+ if( decoder->format_version == 0 ) Ft_set_member_size( trailer, member_size );
+ if( !Rd_code_is_zero( decoder->range_decoder ) )
{
error = true;
if( verbosity >= 0 )
@@ -105,18 +110,18 @@ bool LZd_verify_trailer( struct LZ_decoder * const decoder,
if( verbosity >= 0 )
{
Pp_show_msg( pp, 0 );
- fprintf( stderr, "data size mismatch; trailer says %lld, data size is %lld.\n",
- Ft_get_data_size( trailer ), LZd_data_position( decoder ) );
+ fprintf( stderr, "data size mismatch; trailer says %lld, data size is %lld (0x%llX).\n",
+ Ft_get_data_size( trailer ), LZd_data_position( decoder ), LZd_data_position( decoder ) );
}
}
- if( Ft_get_member_size( trailer ) != LZd_member_position( decoder ) )
+ if( Ft_get_member_size( trailer ) != member_size )
{
error = true;
if( verbosity >= 0 )
{
Pp_show_msg( pp, 0 );
- fprintf( stderr, "member size mismatch; trailer says %lld, member size is %lld.\n",
- Ft_get_member_size( trailer ), LZd_member_position( decoder ) );
+ fprintf( stderr, "member size mismatch; trailer says %lld, member size is %lld (0x%llX).\n",
+ Ft_get_member_size( trailer ), member_size, member_size );
}
}
if( !error && verbosity >= 3 )
@@ -137,41 +142,42 @@ int LZd_decode_member( struct LZ_decoder * const decoder,
unsigned int rep2 = 0; // repeated distances
unsigned int rep3 = 0;
State state = 0;
+ Rd_load( decoder->range_decoder );
while( true )
{
- if( Rd_finished( &decoder->range_decoder ) )
+ if( Rd_finished( decoder->range_decoder ) )
{ LZd_flush_data( decoder ); return 2; }
const int pos_state = LZd_data_position( decoder ) & pos_state_mask;
- if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_match[state][pos_state] ) == 0 )
+ if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_match[state][pos_state] ) == 0 )
{
const uint8_t prev_byte = LZd_get_byte( decoder, 0 );
if( St_is_char( state ) )
- LZd_put_byte( decoder, Lid_decode( &decoder->literal_decoder, &decoder->range_decoder, prev_byte ) );
+ LZd_put_byte( decoder, Lid_decode( &decoder->literal_decoder, decoder->range_decoder, prev_byte ) );
else
- LZd_put_byte( decoder, Lid_decode_matched( &decoder->literal_decoder, &decoder->range_decoder, prev_byte,
+ LZd_put_byte( decoder, Lid_decode_matched( &decoder->literal_decoder, decoder->range_decoder, prev_byte,
LZd_get_byte( decoder, rep0 ) ) );
St_set_char( &state );
}
else
{
int len;
- if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_rep[state] ) == 1 )
+ if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep[state] ) == 1 )
{
len = 0;
- if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_rep0[state] ) == 0 )
+ if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep0[state] ) == 0 )
{
- if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_len[state][pos_state] ) == 0 )
+ if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_len[state][pos_state] ) == 0 )
{ len = 1; St_set_short_rep( &state ); }
}
else
{
unsigned int distance;
- if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_rep1[state] ) == 0 )
+ if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep1[state] ) == 0 )
distance = rep1;
else
{
- if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_rep2[state] ) == 0 )
+ if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep2[state] ) == 0 )
distance = rep2;
else { distance = rep3; rep3 = rep2; }
rep2 = rep1;
@@ -181,30 +187,30 @@ int LZd_decode_member( struct LZ_decoder * const decoder,
}
if( len == 0 )
{
- len = min_match_len + Led_decode( &decoder->rep_match_len_decoder, &decoder->range_decoder, pos_state );
+ len = min_match_len + Led_decode( &decoder->rep_match_len_decoder, decoder->range_decoder, pos_state );
St_set_rep( &state );
}
}
else
{
unsigned int rep0_saved = rep0;
- len = min_match_len + Led_decode( &decoder->len_decoder, &decoder->range_decoder, pos_state );
- const int dis_slot = Rd_decode_tree( &decoder->range_decoder, decoder->bm_dis_slot[get_dis_state(len)], dis_slot_bits );
+ len = min_match_len + Led_decode( &decoder->len_decoder, decoder->range_decoder, pos_state );
+ const int dis_slot = Rd_decode_tree( decoder->range_decoder, decoder->bm_dis_slot[get_dis_state(len)], dis_slot_bits );
if( dis_slot < start_dis_model ) rep0 = dis_slot;
else
{
const int direct_bits = ( dis_slot >> 1 ) - 1;
rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
if( dis_slot < end_dis_model )
- rep0 += Rd_decode_tree_reversed( &decoder->range_decoder, decoder->bm_dis + rep0 - dis_slot, direct_bits );
+ rep0 += Rd_decode_tree_reversed( decoder->range_decoder, decoder->bm_dis + rep0 - dis_slot, direct_bits );
else
{
- rep0 += Rd_decode( &decoder->range_decoder, direct_bits - dis_align_bits ) << dis_align_bits;
- rep0 += Rd_decode_tree_reversed( &decoder->range_decoder, decoder->bm_align, dis_align_bits );
- if( rep0 == 0xFFFFFFFF ) // Marker found
+ rep0 += Rd_decode( decoder->range_decoder, direct_bits - dis_align_bits ) << dis_align_bits;
+ rep0 += Rd_decode_tree_reversed( decoder->range_decoder, decoder->bm_align, dis_align_bits );
+ if( rep0 == 0xFFFFFFFFU ) // Marker found
{
rep0 = rep0_saved;
- Rd_normalize( &decoder->range_decoder );
+ Rd_normalize( decoder->range_decoder );
LZd_flush_data( decoder );
if( len == min_match_len ) // End Of Stream marker
{
@@ -212,7 +218,7 @@ int LZd_decode_member( struct LZ_decoder * const decoder,
}
if( len == min_match_len + 1 ) // Sync Flush marker
{
- Rd_reload( &decoder->range_decoder ); continue;
+ Rd_load( decoder->range_decoder ); continue;
}
if( verbosity >= 0 )
{
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-10 16:54:45 +0000