lzip/lziprecover
1
0
Fork 0
Code Issues Activity

Adding upstream version 1.19.

Browse source 
Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
Daniel Baumann 2025-02-21 11:27:50 +01:00
parent f46d8ce0c8
commit d7ceba2005
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
31 changed files with 1468 additions and 963 deletions
Download patch file Download diff file Expand all files Collapse all files

121
decoder.h
View file

@ -1,5 +1,5 @@
/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2016 Antonio Diaz Diaz.
Copyright (C) 2009-2017 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
@ -50,7 +50,9 @@ public:
unsigned get_code() const { return code; }
bool finished() { return pos >= stream_pos && !read_block(); }
unsigned long long member_position() const { return partial_member_pos + pos; }
void reset_member_position() { partial_member_pos = -pos; }
void reset_member_position()
{ partial_member_pos = 0; partial_member_pos -= pos; }
uint8_t get_byte()
{
@ -61,15 +63,15 @@ public:
int read_data( uint8_t * const outbuf, const int size )
{
int rest = size;
while( rest > 0 && !finished() )
int sz = 0;
while( sz < size && !finished() )
{
const int rd = std::min( rest, stream_pos - pos );
std::memcpy( outbuf + size - rest, buffer + pos, rd );
const int rd = std::min( size - sz, stream_pos - pos );
std::memcpy( outbuf + sz, buffer + pos, rd );
pos += rd;
rest -= rd;
sz += rd;
}
return size - rest;
return sz;
}
void load()
@ -86,24 +88,23 @@ public:
{ range <<= 8; code = (code << 8) | get_byte(); }
}
int decode( const int num_bits )
unsigned decode( const int num_bits )
{
int symbol = 0;
unsigned symbol = 0;
for( int i = num_bits; i > 0; --i )
{
normalize();
range >>= 1;
// symbol <<= 1;
// if( code >= range ) { code -= range; symbol |= 1; }
const uint32_t mask = 0U - (code < range);
code -= range;
code += range & mask;
symbol = (symbol << 1) + (mask + 1);
const bool bit = ( code >= range );
symbol = ( symbol << 1 ) + bit;
code -= range & ( 0U - bit );
}
return symbol;
}
int decode_bit( Bit_model & bm )
unsigned decode_bit( Bit_model & bm )
{
normalize();
const uint32_t bound = ( range >> bit_model_total_bits ) * bm.probability;
@ -122,18 +123,18 @@ public:
}
}
int decode_tree3( Bit_model bm[] )
unsigned decode_tree3( Bit_model bm[] )
{
int symbol = 1;
unsigned symbol = 1;
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
return symbol & 7;
}
int decode_tree6( Bit_model bm[] )
unsigned decode_tree6( Bit_model bm[] )
{
int symbol = 1;
unsigned symbol = 1;
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
@ -143,49 +144,47 @@ public:
return symbol & 0x3F;
}
int decode_tree8( Bit_model bm[] )
unsigned decode_tree8( Bit_model bm[] )
{
int symbol = 1;
while( symbol < 0x100 )
unsigned symbol = 1;
for( int i = 0; i < 8; ++i )
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
return symbol & 0xFF;
}
int decode_tree_reversed( Bit_model bm[], const int num_bits )
unsigned decode_tree_reversed( Bit_model bm[], const int num_bits )
{
int model = 1;
int symbol = 0;
unsigned model = 1;
unsigned symbol = 0;
for( int i = 0; i < num_bits; ++i )
{
const bool bit = decode_bit( bm[model] );
model <<= 1;
if( bit ) { ++model; symbol |= (1 << i); }
const unsigned bit = decode_bit( bm[model] );
model = ( model << 1 ) + bit;
symbol |= ( bit << i );
}
return symbol;
}
int decode_tree_reversed4( Bit_model bm[] )
unsigned decode_tree_reversed4( Bit_model bm[] )
{
int model = 1;
int symbol = decode_bit( bm[model] );
model = (model << 1) + symbol;
int bit = decode_bit( bm[model] );
model = (model << 1) + bit; symbol |= (bit << 1);
unsigned symbol = decode_bit( bm[1] );
unsigned model = 2 + symbol;
unsigned bit = decode_bit( bm[model] );
model = ( model << 1 ) + bit; symbol |= ( bit << 1 );
bit = decode_bit( bm[model] );
model = (model << 1) + bit; symbol |= (bit << 2);
if( decode_bit( bm[model] ) ) symbol |= 8;
model = ( model << 1 ) + bit; symbol |= ( bit << 2 );
symbol |= ( decode_bit( bm[model] ) << 3 );
return symbol;
}
int decode_matched( Bit_model bm[], int match_byte )
unsigned decode_matched( Bit_model bm[], unsigned match_byte )
{
Bit_model * const bm1 = bm + 0x100;
int symbol = 1;
unsigned symbol = 1;
while( symbol < 0x100 )
{
match_byte <<= 1;
const int match_bit = match_byte & 0x100;
const int bit = decode_bit( bm1[match_bit+symbol] );
const unsigned match_bit = ( match_byte <<= 1 ) & 0x100;
const unsigned bit = decode_bit( bm1[match_bit+symbol] );
symbol = ( symbol << 1 ) | bit;
if( match_bit != bit << 8 )
{
@ -197,7 +196,7 @@ public:
return symbol & 0xFF;
}
int decode_len( Len_model & lm, const int pos_state )
unsigned decode_len( Len_model & lm, const int pos_state )
{
if( decode_bit( lm.choice1 ) == 0 )
return decode_tree3( lm.bm_low[pos_state] );
@ -229,14 +228,15 @@ class LZ_decoder
uint8_t peek_prev() const
{
const unsigned i = ( ( pos > 0 ) ? pos : dictionary_size ) - 1;
return buffer[i];
if( pos > 0 ) return buffer[pos-1];
if( pos_wrapped ) return buffer[dictionary_size-1];
return 0; // prev_byte of first byte
}
uint8_t peek( const unsigned distance ) const
{
unsigned i = pos - distance - 1;
if( pos <= distance ) i += dictionary_size;
const unsigned i = ( ( pos > distance ) ? 0 : dictionary_size ) +
pos - distance - 1;
return buffer[i];
}
@ -248,17 +248,26 @@ class LZ_decoder
void copy_block( const unsigned distance, unsigned len )
{
unsigned i = pos - distance - 1;
bool fast;
if( pos <= distance )
{ i += dictionary_size;
fast = ( len <= dictionary_size - i && len <= i - pos ); }
else
fast = ( len < dictionary_size - pos && len <= pos - i );
if( fast ) // no wrap, no overlap
unsigned lpos = pos, i = lpos - distance - 1;
bool fast, fast2;
if( lpos > distance )
{
fast = ( len < dictionary_size - lpos );
fast2 = ( fast && len <= lpos - i );
}
else
{
i += dictionary_size;
fast = ( len < dictionary_size - i ); // (i == pos) may happen
fast2 = ( fast && len <= i - lpos );
}
if( fast ) // no wrap
{
std::memcpy( buffer + pos, buffer + i, len );
pos += len;
if( fast2 ) // no wrap, no overlap
std::memcpy( buffer + lpos, buffer + i, len );
else
for( ; len > 0; --len ) buffer[lpos++] = buffer[i++];
}
else for( ; len > 0; --len )
{
@ -287,7 +296,7 @@ public:
crc_( 0xFFFFFFFFU ),
outfd( ofd ),
pos_wrapped( false )
{ buffer[dictionary_size-1] = 0; } // prev_byte of first byte
{}
~LZ_decoder() { delete[] buffer; }