lzip/lzlib
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Adding upstream version 1.0.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
Daniel Baumann 2025-02-20 16:23:41 +01:00
parent fefe46d70f
commit f0061db313
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
14 changed files with 508 additions and 366 deletions
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162
decoder.cc
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@ -38,71 +38,11 @@
#include "decoder.h"
const CRC32 crc32;
// Copies up to `out_size' bytes to `out_buffer' and updates `get'.
// Returns the number of bytes copied.
int Circular_buffer::read_data( uint8_t * const out_buffer, const int out_size ) throw()
{
if( out_size < 0 ) return 0;
int size = 0;
if( get > put )
{
size = std::min( buffer_size - get, out_size );
if( size > 0 )
{
std::memcpy( out_buffer, buffer + get, size );
get += size;
if( get >= buffer_size ) get = 0;
}
}
if( get < put )
{
const int size2 = std::min( put - get, out_size - size );
if( size2 > 0 )
{
std::memcpy( out_buffer + size, buffer + get, size2 );
get += size2;
size += size2;
}
}
return size;
}
// Copies up to `in_size' bytes from `in_buffer' and updates `put'.
// Returns the number of bytes copied.
int Circular_buffer::write_data( const uint8_t * const in_buffer, const int in_size ) throw()
{
if( in_size < 0 ) return 0;
int size = 0;
if( put >= get )
{
size = std::min( buffer_size - put - (get == 0), in_size );
if( size > 0 )
{
std::memcpy( buffer + put, in_buffer, size );
put += size;
if( put >= buffer_size ) put = 0;
}
}
if( put < get )
{
const int size2 = std::min( get - put - 1, in_size - size );
if( size2 > 0 )
{
std::memcpy( buffer + put, in_buffer + size, size2 );
put += size2;
size += size2;
}
}
return size;
}
const CRC32 Lzlib_namespace::crc32;
// Seeks a member header and updates `get'.
// Returns true if it finds a valid header.
bool Input_buffer::find_header() throw()
bool Range_decoder::find_header() throw()
{
while( get != put )
{
@ -110,10 +50,10 @@ bool Input_buffer::find_header() throw()
{
int g = get;
File_header header;
for( unsigned int i = 0; i < sizeof header; ++i )
for( int i = 0; i < File_header::size; ++i )
{
if( g == put ) return false; // not enough data
((uint8_t *)&header)[i] = buffer[g];
header.data[i] = buffer[g];
if( ++g >= buffer_size ) g = 0;
}
if( header.verify() ) return true;
@ -127,36 +67,44 @@ bool Input_buffer::find_header() throw()
// Returns true, fills `header', and updates `get' if `get' points to a
// valid header.
// Else returns false and leaves `get' unmodified.
bool Input_buffer::read_header( File_header & header ) throw()
bool Range_decoder::read_header( File_header & header ) throw()
{
int g = get;
for( unsigned int i = 0; i < sizeof header; ++i )
for( int i = 0; i < File_header::size; ++i )
{
if( g == put ) return false; // not enough data
((uint8_t *)&header)[i] = buffer[g];
header.data[i] = buffer[g];
if( ++g >= buffer_size ) g = 0;
}
if( header.verify() ) { get = g; return true; }
if( header.verify() )
{
get = g;
member_pos = File_header::size;
reload_pending = true;
return true;
}
return false;
}
bool LZ_decoder::verify_trailer()
{
bool error = false;
File_trailer trailer;
const int trailer_size = trailer.size( format_version );
const int trailer_size = File_trailer::size( member_version );
const long long member_size = range_decoder.member_position() + trailer_size;
bool error = false;
for( int i = 0; i < trailer_size && !error; ++i )
{
if( !range_decoder.finished() )
((uint8_t *)&trailer)[i] = range_decoder.get_byte();
else error = true;
trailer.data[i] = range_decoder.get_byte();
else { error = true; for( ; i < trailer_size; ++i ) trailer.data[i] = 0; }
}
if( format_version == 0 ) trailer.member_size( member_position() );
if( member_version == 0 ) trailer.member_size( member_size );
if( !range_decoder.code_is_zero() ) error = true;
if( trailer.data_crc() != crc() ) error = true;
if( trailer.data_size() != data_position() ) error = true;
if( trailer.member_size() != member_position() ) error = true;
if( trailer.member_size() != member_size ) error = true;
return !error;
}
@ -169,7 +117,7 @@ int LZ_decoder::decode_member()
if( !range_decoder.try_reload() ) return 0;
if( verify_trailer_pending )
{
if( range_decoder.available_bytes() < File_trailer::size( format_version ) &&
if( range_decoder.available_bytes() < File_trailer::size( member_version ) &&
!range_decoder.at_stream_end() )
return 0;
verify_trailer_pending = false;
@ -240,13 +188,13 @@ int LZ_decoder::decode_member()
{
rep0 += range_decoder.decode( direct_bits - dis_align_bits ) << dis_align_bits;
rep0 += range_decoder.decode_tree_reversed( bm_align, dis_align_bits );
if( rep0 == 0xFFFFFFFF ) // Marker found
if( rep0 == 0xFFFFFFFFU ) // Marker found
{
rep0 = rep0_saved;
range_decoder.normalize();
if( len == min_match_len ) // End Of Stream marker
{
if( range_decoder.available_bytes() < File_trailer::size( format_version ) &&
if( range_decoder.available_bytes() < File_trailer::size( member_version ) &&
!range_decoder.at_stream_end() )
{ verify_trailer_pending = true; return 0; }
member_finished_ = true;
@ -269,3 +217,63 @@ int LZ_decoder::decode_member()
}
}
}
// Copies up to `out_size' bytes to `out_buffer' and updates `get'.
// Returns the number of bytes copied.
int Circular_buffer::read_data( uint8_t * const out_buffer, const int out_size ) throw()
{
if( out_size < 0 ) return 0;
int size = 0;
if( get > put )
{
size = std::min( buffer_size - get, out_size );
if( size > 0 )
{
std::memcpy( out_buffer, buffer + get, size );
get += size;
if( get >= buffer_size ) get = 0;
}
}
if( get < put )
{
const int size2 = std::min( put - get, out_size - size );
if( size2 > 0 )
{
std::memcpy( out_buffer + size, buffer + get, size2 );
get += size2;
size += size2;
}
}
return size;
}
// Copies up to `in_size' bytes from `in_buffer' and updates `put'.
// Returns the number of bytes copied.
int Circular_buffer::write_data( const uint8_t * const in_buffer, const int in_size ) throw()
{
if( in_size < 0 ) return 0;
int size = 0;
if( put >= get )
{
size = std::min( buffer_size - put - (get == 0), in_size );
if( size > 0 )
{
std::memcpy( buffer + put, in_buffer, size );
put += size;
if( put >= buffer_size ) put = 0;
}
}
if( put < get )
{
const int size2 = std::min( get - put - 1, in_size - size );
if( size2 > 0 )
{
std::memcpy( buffer + put, in_buffer + size, size2 );
put += size2;
size += size2;
}
}
return size;
}