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/* Lzcheck - A test program for the lzlib library
Copyright (C) 2009, 2010 Antonio Diaz Diaz.
This program is free software: you have unlimited permission
to copy, distribute and modify it.
Usage is:
lzcheck filename.txt
This program reads the specified text file and then compresses it,
line by line, to test the flushing mechanism and the member
restart/reset/sync functions.
*/
#define _FILE_OFFSET_BITS 64
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <stdint.h>
#include <unistd.h>
#include "lzlib.h"
#ifndef LLONG_MAX
#define LLONG_MAX 0x7FFFFFFFFFFFFFFFLL
#endif
#ifndef LLONG_MIN
#define LLONG_MIN (-LLONG_MAX - 1LL)
#endif
#ifndef ULLONG_MAX
#define ULLONG_MAX 0xFFFFFFFFFFFFFFFFULL
#endif
const int buffer_size = 32768;
uint8_t in_buffer[buffer_size];
uint8_t mid_buffer[buffer_size];
uint8_t out_buffer[buffer_size];
int main( const int argc, const char * argv[] )
{
if( argc < 2 )
{
std::fprintf( stderr, "Usage: lzcheck filename.txt\n" );
return 1;
}
FILE *file = std::fopen( argv[1], "rb" );
if( !file )
{
std::fprintf( stderr, "Can't open file `%s' for reading\n", argv[1] );
return 1;
}
// std::fprintf( stderr, "lzcheck: testing file `%s'\n", argv[1] );
const int dictionary_size = 1 << 20;
const int match_len_limit = 80;
const long long member_size = LLONG_MAX;
LZ_Encoder * encoder = LZ_compress_open( dictionary_size, match_len_limit,
member_size );
if( !encoder || LZ_compress_errno( encoder ) != LZ_ok )
{
const bool mem_error = ( LZ_compress_errno( encoder ) == LZ_mem_error );
LZ_compress_close( encoder );
if( mem_error )
{
std::fprintf( stderr, "not enough memory.\n" );
return 1;
}
std::fprintf( stderr, "internal error: invalid argument to encoder.\n" );
return 3;
}
LZ_Decoder * decoder = LZ_decompress_open();
if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
{
LZ_decompress_close( decoder );
std::fprintf( stderr, "not enough memory.\n" );
return 1;
}
int retval = 0;
while( retval <= 2 )
{
const int read_size = std::fread( in_buffer, 1, buffer_size / 2, file );
if( read_size <= 0 ) break; // end of file
for( int l = 0, r = 1; r <= read_size; l = r, ++r )
{
while( r < read_size && in_buffer[r-1] != '\n' ) ++r;
const int leading_garbage = (l == 0) ? std::min( r, read_size / 2 ) : 0;
const int in_size = LZ_compress_write( encoder, in_buffer + l, r - l );
if( in_size < r - l ) r = l + in_size;
LZ_compress_sync_flush( encoder );
if( leading_garbage )
std::memset( mid_buffer, in_buffer[0], leading_garbage );
const int mid_size = LZ_compress_read( encoder,
mid_buffer + leading_garbage,
buffer_size - leading_garbage );
if( mid_size < 0 )
{
std::fprintf( stderr, "LZ_compress_read error: %s.\n",
LZ_strerror( LZ_compress_errno( encoder ) ) );
retval = 3; break;
}
LZ_decompress_write( decoder, mid_buffer, mid_size + leading_garbage );
int out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
if( out_size < 0 )
{
if( LZ_decompress_errno( decoder ) == LZ_header_error ||
LZ_decompress_errno( decoder ) == LZ_data_error )
{
LZ_decompress_sync_to_member( decoder ); // remove leading garbage
out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
}
if( out_size < 0 )
{
std::fprintf( stderr, "LZ_decompress_read error: %s.\n",
LZ_strerror( LZ_decompress_errno( decoder ) ) );
retval = 3; break;
}
}
if( out_size != in_size || std::memcmp( in_buffer + l, out_buffer, out_size ) )
{
std::fprintf( stderr, "sync error at pos %d. in_size = %d, out_size = %d\n",
l, in_size, out_size );
for( int i = 0; i < in_size; ++i )
std::fputc( in_buffer[l+i], stderr );
if( in_buffer[l+in_size-1] != '\n' )
std::fputc( '\n', stderr );
for( int i = 0; i < out_size; ++i )
std::fputc( out_buffer[i], stderr );
std::fputc( '\n', stderr );
retval = 1;
}
}
if( retval >= 3 ) break;
if( LZ_compress_finish( encoder ) < 0 ||
LZ_decompress_write( decoder, mid_buffer, LZ_compress_read( encoder, mid_buffer, buffer_size ) ) < 0 ||
LZ_decompress_read( decoder, out_buffer, buffer_size ) != 0 ||
LZ_decompress_reset( decoder ) < 0 ||
LZ_compress_restart_member( encoder, member_size ) < 0 )
{
std::fprintf( stderr, "can't restart member: %s.\n",
LZ_strerror( LZ_decompress_errno( decoder ) ) );
retval = 3; break;
}
const int size = std::min( 100, read_size );
if( LZ_compress_write( encoder, in_buffer, size ) != size ||
LZ_compress_finish( encoder ) < 0 ||
LZ_decompress_write( decoder, mid_buffer, LZ_compress_read( encoder, mid_buffer, buffer_size ) ) < 0 ||
LZ_decompress_read( decoder, out_buffer, 0 ) != 0 ||
LZ_decompress_sync_to_member( decoder ) < 0 ||
LZ_compress_restart_member( encoder, member_size ) < 0 )
{
std::fprintf( stderr, "can't seek to next member: %s.\n",
LZ_strerror( LZ_decompress_errno( decoder ) ) );
retval = 3; break;
}
}
LZ_decompress_close( decoder );
LZ_compress_close( encoder );
std::fclose( file );
return retval;
}
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