lzip/lzlib
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Adding upstream version 1.1.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
Daniel Baumann 2025-02-20 16:49:35 +01:00
parent f0061db313
commit 8d95be3bd8
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
23 changed files with 710 additions and 380 deletions
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36
decoder.cc
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@ -1,5 +1,5 @@
/* Lzlib - A compression library for lzip files
Copyright (C) 2009, 2010 Antonio Diaz Diaz.
Copyright (C) 2009, 2010, 2011 Antonio Diaz Diaz.
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -38,7 +38,9 @@
#include "decoder.h"
const CRC32 Lzlib_namespace::crc32;
namespace Lzlib {
const CRC32 crc32;
// Seeks a member header and updates `get'.
// Returns true if it finds a valid header.
@ -98,7 +100,11 @@ bool LZ_decoder::verify_trailer()
{
if( !range_decoder.finished() )
trailer.data[i] = range_decoder.get_byte();
else { error = true; for( ; i < trailer_size; ++i ) trailer.data[i] = 0; }
else
{
error = true;
for( ; i < trailer_size; ++i ) trailer.data[i] = 0;
}
}
if( member_version == 0 ) trailer.member_size( member_size );
if( !range_decoder.code_is_zero() ) error = true;
@ -132,7 +138,7 @@ int LZ_decoder::decode_member()
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_byte( 0 );
const uint8_t prev_byte = get_prev_byte();
if( state.is_char() )
put_byte( literal_decoder.decode( range_decoder, prev_byte ) );
else
@ -146,12 +152,7 @@ int LZ_decoder::decode_member()
if( range_decoder.decode_bit( bm_rep[state()] ) == 1 )
{
len = 0;
if( range_decoder.decode_bit( bm_rep0[state()] ) == 0 )
{
if( range_decoder.decode_bit( bm_len[state()][pos_state] ) == 0 )
{ len = 1; state.set_short_rep(); }
}
else
if( range_decoder.decode_bit( bm_rep0[state()] ) == 1 )
{
unsigned int distance;
if( range_decoder.decode_bit( bm_rep1[state()] ) == 0 )
@ -166,15 +167,20 @@ int LZ_decoder::decode_member()
rep1 = rep0;
rep0 = distance;
}
else
{
if( range_decoder.decode_bit( bm_len[state()][pos_state] ) == 0 )
{ state.set_short_rep(); len = 1; }
}
if( len == 0 )
{
len = min_match_len + rep_match_len_decoder.decode( range_decoder, pos_state );
state.set_rep();
len = min_match_len + rep_match_len_decoder.decode( range_decoder, pos_state );
}
}
else
{
unsigned int rep0_saved = rep0;
const unsigned int 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 );
if( dis_slot < start_dis_model ) rep0 = dis_slot;
@ -207,11 +213,13 @@ int LZ_decoder::decode_member()
}
return 4;
}
if( rep0 >= (unsigned int)dictionary_size ) return 1;
}
}
rep3 = rep2; rep2 = rep1; rep1 = rep0_saved;
state.set_match();
if( rep0 >= (unsigned int)dictionary_size ||
( rep0 >= (unsigned int)put && !partial_data_pos ) )
return 1;
}
copy_block( rep0, len );
}
@ -277,3 +285,5 @@ int Circular_buffer::write_data( const uint8_t * const in_buffer, const int in_s
}
return size;
}
} // end namespace Lzlib