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-rw-r--r--decoder.cc90
1 files changed, 47 insertions, 43 deletions
diff --git a/decoder.cc b/decoder.cc
index fdb4ff9..5e26504 100644
--- a/decoder.cc
+++ b/decoder.cc
@@ -1,5 +1,5 @@
/* Lziprecover - Data recovery tool for lzipped files
- Copyright (C) 2009, 2010, 2011, 2012 Antonio Diaz Diaz.
+ Copyright (C) 2009, 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
@@ -34,19 +34,19 @@
const CRC32 crc32;
-void Pretty_print::operator()( const char * const msg ) const
+void Pretty_print::operator()( const char * const msg, FILE * const f ) const
{
if( verbosity_ >= 0 )
{
if( first_post )
{
first_post = false;
- std::fprintf( stderr, " %s: ", name_.c_str() );
- for( unsigned int i = 0; i < longest_name - name_.size(); ++i )
- std::fprintf( stderr, " " );
- if( !msg ) std::fflush( stderr );
+ std::fprintf( f, " %s: ", name_.c_str() );
+ for( unsigned i = 0; i < longest_name - name_.size(); ++i )
+ std::fprintf( f, " " );
+ if( !msg ) std::fflush( f );
}
- if( msg ) std::fprintf( stderr, "%s.\n", msg );
+ if( msg ) std::fprintf( f, "%s.\n", msg );
}
}
@@ -60,13 +60,13 @@ int readblock( const int fd, uint8_t * const buf, const int size )
errno = 0;
while( rest > 0 )
{
- errno = 0;
const int n = read( fd, buf + size - rest, rest );
if( n > 0 ) rest -= n;
- else if( n == 0 ) break;
+ else if( n == 0 ) break; // EOF
else if( errno != EINTR && errno != EAGAIN ) break;
+ errno = 0;
}
- return ( rest > 0 ) ? size - rest : size;
+ return size - rest;
}
@@ -79,12 +79,12 @@ int writeblock( const int fd, const uint8_t * const buf, const int size )
errno = 0;
while( rest > 0 )
{
- errno = 0;
const int n = write( fd, buf + size - rest, rest );
if( n > 0 ) rest -= n;
else if( n < 0 && errno != EINTR && errno != EAGAIN ) break;
+ errno = 0;
}
- return ( rest > 0 ) ? size - rest : size;
+ return size - rest;
}
@@ -110,9 +110,10 @@ void LZ_decoder::flush_data()
crc32.update( crc_, buffer + stream_pos, size );
if( outfd >= 0 )
{
- const long long i = std::max( 0LL, outskip - stream_position() );
+ const unsigned long long sp = stream_position();
+ const long long i = positive_diff( outskip, sp );
const long long s =
- std::min( outend - stream_position(), (long long)size ) - i;
+ std::min( positive_diff( outend, sp ), (unsigned long long)size ) - i;
if( s > 0 && writeblock( outfd, buffer + stream_pos + i, s ) != s )
throw Error( "Write error" );
}
@@ -126,10 +127,11 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
{
File_trailer trailer;
const int trailer_size = File_trailer::size( member_version );
- const long long member_size = range_decoder.member_position() + trailer_size;
+ const unsigned long long member_size =
+ range_decoder.member_position() + trailer_size;
bool error = false;
- const int size = range_decoder.read( trailer.data, trailer_size );
+ int size = range_decoder.read_data( trailer.data, trailer_size );
if( size < trailer_size )
{
error = true;
@@ -139,9 +141,11 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
std::fprintf( stderr, "Trailer truncated at trailer position %d;"
" some checks may fail.\n", size );
}
- for( int i = size; i < trailer_size; ++i ) trailer.data[i] = 0;
+ while( size < trailer_size ) trailer.data[size++] = 0;
}
+
if( member_version == 0 ) trailer.member_size( member_size );
+
if( !range_decoder.code_is_zero() )
{
error = true;
@@ -154,7 +158,7 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
{
pp();
std::fprintf( stderr, "CRC mismatch; trailer says %08X, data CRC is %08X.\n",
- (unsigned int)trailer.data_crc(), (unsigned int)crc() );
+ trailer.data_crc(), crc() );
}
}
if( trailer.data_size() != data_position() )
@@ -163,7 +167,7 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
if( pp.verbosity() >= 0 )
{
pp();
- std::fprintf( stderr, "Data size mismatch; trailer says %lld, data size is %lld (0x%llX).\n",
+ std::fprintf( stderr, "Data size mismatch; trailer says %llu, data size is %llu (0x%llX).\n",
trailer.data_size(), data_position(), data_position() );
}
}
@@ -173,7 +177,7 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
if( pp.verbosity() >= 0 )
{
pp();
- std::fprintf( stderr, "Member size mismatch; trailer says %lld, member size is %lld (0x%llX).\n",
+ std::fprintf( stderr, "Member size mismatch; trailer says %llu, member size is %llu (0x%llX).\n",
trailer.member_size(), member_size, member_size );
}
}
@@ -183,9 +187,8 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
( 8.0 * member_size ) / data_position(),
100.0 * ( 1.0 - ( (double)member_size / data_position() ) ) );
if( !error && pp.verbosity() >= 4 )
- std::fprintf( stderr, "data CRC %08X, data size %9lld, member size %8lld. ",
- (unsigned int)trailer.data_crc(), trailer.data_size(),
- trailer.member_size() );
+ std::fprintf( stderr, "data CRC %08X, data size %9llu, member size %8llu. ",
+ trailer.data_crc(), trailer.data_size(), trailer.member_size() );
return !error;
}
@@ -194,6 +197,7 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
// 3 = trailer error, 4 = unknown marker found.
int LZ_decoder::decode_member( const Pretty_print & pp )
{
+ Bit_model bm_literal[1<<literal_context_bits][0x300];
Bit_model bm_match[State::states][pos_states];
Bit_model bm_rep[State::states];
Bit_model bm_rep0[State::states];
@@ -201,32 +205,30 @@ int LZ_decoder::decode_member( const Pretty_print & pp )
Bit_model bm_rep2[State::states];
Bit_model bm_len[State::states][pos_states];
Bit_model bm_dis_slot[max_dis_states][1<<dis_slot_bits];
- Bit_model bm_dis[modeled_distances-end_dis_model+1];
+ Bit_model bm_dis[modeled_distances-end_dis_model];
Bit_model bm_align[dis_align_size];
-
- unsigned int rep0 = 0; // rep[0-3] latest four distances
- unsigned int rep1 = 0; // used for efficient coding of
- unsigned int rep2 = 0; // repeated distances
- unsigned int rep3 = 0;
-
Len_decoder len_decoder;
Len_decoder rep_match_len_decoder;
- Literal_decoder literal_decoder;
+
+ unsigned rep0 = 0; // rep[0-3] latest four distances
+ unsigned rep1 = 0; // used for efficient coding of
+ unsigned rep2 = 0; // repeated distances
+ unsigned rep3 = 0;
+
State state;
range_decoder.load();
- while( true )
+ while( !range_decoder.finished() )
{
- if( range_decoder.finished() ) { flush_data(); return 2; }
const int pos_state = data_position() & pos_state_mask;
if( range_decoder.decode_bit( bm_match[state()][pos_state] ) == 0 )
{
const uint8_t prev_byte = get_prev_byte();
if( state.is_char() )
- put_byte( literal_decoder.decode( range_decoder, prev_byte ) );
+ put_byte( range_decoder.decode_tree( bm_literal[get_lit_state(prev_byte)], 8 ) );
else
- put_byte( literal_decoder.decode_matched( range_decoder, prev_byte,
- get_byte( rep0 ) ) );
+ put_byte( range_decoder.decode_matched( bm_literal[get_lit_state(prev_byte)],
+ get_byte( rep0 ) ) );
state.set_char();
}
else
@@ -237,7 +239,7 @@ int LZ_decoder::decode_member( const Pretty_print & pp )
len = 0;
if( range_decoder.decode_bit( bm_rep0[state()] ) == 1 )
{
- unsigned int distance;
+ unsigned distance;
if( range_decoder.decode_bit( bm_rep1[state()] ) == 0 )
distance = rep1;
else
@@ -263,20 +265,20 @@ int LZ_decoder::decode_member( const Pretty_print & pp )
}
else
{
- const unsigned int rep0_saved = rep0;
+ const unsigned rep0_saved = rep0;
len = min_match_len + len_decoder.decode( range_decoder, pos_state );
- const int dis_slot = range_decoder.decode_tree( bm_dis_slot[get_dis_state(len)], dis_slot_bits );
+ const int dis_slot = range_decoder.decode_tree6( bm_dis_slot[get_dis_state(len)] );
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 += range_decoder.decode_tree_reversed( bm_dis + rep0 - dis_slot, direct_bits );
+ rep0 += range_decoder.decode_tree_reversed( bm_dis + rep0 - dis_slot - 1, direct_bits );
else
{
rep0 += range_decoder.decode( direct_bits - dis_align_bits ) << dis_align_bits;
- rep0 += range_decoder.decode_tree_reversed( bm_align, dis_align_bits );
+ rep0 += range_decoder.decode_tree_reversed4( bm_align );
if( rep0 == 0xFFFFFFFFU ) // Marker found
{
rep0 = rep0_saved;
@@ -301,11 +303,13 @@ int LZ_decoder::decode_member( const Pretty_print & pp )
}
rep3 = rep2; rep2 = rep1; rep1 = rep0_saved;
state.set_match();
- if( rep0 >= (unsigned int)dictionary_size ||
- ( rep0 >= (unsigned int)pos && !partial_data_pos ) )
+ if( rep0 >= (unsigned)dictionary_size ||
+ ( rep0 >= (unsigned)pos && !partial_data_pos ) )
{ flush_data(); return 1; }
}
copy_block( rep0, len );
}
}
+ flush_data();
+ return 2;
}