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/* Lzcheck - Test program for the lzlib library
Copyright (C) 2009-2015 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 <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "lzlib.h"
#ifndef min
#define min(x,y) ((x) <= (y) ? (x) : (y))
#endif
enum { buffer_size = 32768 };
uint8_t in_buffer[buffer_size];
uint8_t mid_buffer[buffer_size];
uint8_t out_buffer[buffer_size];
int lzcheck( FILE * const file, const int dictionary_size )
{
const int match_len_limit = 16;
const unsigned long long member_size = 0x7FFFFFFFFFFFFFFFULL; /* INT64_MAX */
struct LZ_Encoder * encoder;
struct LZ_Decoder * decoder;
int retval = 0;
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 )
{
fputs( "lzcheck: Not enough memory.\n", stderr );
return 1;
}
fputs( "lzcheck: internal error: Invalid argument to encoder.\n", stderr );
return 3;
}
decoder = LZ_decompress_open();
if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
{
LZ_decompress_close( decoder );
fputs( "lzcheck: Not enough memory.\n", stderr );
return 1;
}
while( retval <= 1 )
{
int i, l, r;
const int read_size = fread( in_buffer, 1, buffer_size, file );
if( read_size <= 0 ) break; /* end of file */
for( l = 0, r = 1; r <= read_size; l = r, ++r )
{
int in_size, mid_size, out_size;
while( r < read_size && in_buffer[r-1] != '\n' ) ++r;
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 );
mid_size = LZ_compress_read( encoder, mid_buffer, buffer_size );
if( mid_size < 0 )
{
fprintf( stderr, "lzcheck: LZ_compress_read error: %s\n",
LZ_strerror( LZ_compress_errno( encoder ) ) );
retval = 3; break;
}
LZ_decompress_write( decoder, mid_buffer, mid_size );
out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
if( out_size < 0 )
{
fprintf( stderr, "lzcheck: LZ_decompress_read error: %s\n",
LZ_strerror( LZ_decompress_errno( decoder ) ) );
retval = 3; break;
}
if( out_size != in_size || memcmp( in_buffer + l, out_buffer, out_size ) )
{
fprintf( stderr, "lzcheck: Sync error at pos %d. in_size = %d, out_size = %d.\n",
l, in_size, out_size );
for( i = 0; i < in_size; ++i )
fputc( in_buffer[l+i], stderr );
if( in_buffer[l+in_size-1] != '\n' )
fputc( '\n', stderr );
for( i = 0; i < out_size; ++i )
fputc( out_buffer[i], stderr );
fputc( '\n', stderr );
retval = 1;
}
}
}
if( retval <= 1 )
{
rewind( file );
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_compress_restart_member( encoder, member_size ) < 0 )
{
fprintf( stderr, "lzcheck: Can't finish member: %s\n",
LZ_strerror( LZ_decompress_errno( decoder ) ) );
retval = 3;
}
}
while( retval <= 1 )
{
int i, l, r, size;
const int read_size = fread( in_buffer, 1, buffer_size / 2, file );
if( read_size <= 0 ) break; /* end of file */
for( l = 0, r = 1; r <= read_size; l = r, ++r )
{
int leading_garbage, in_size, mid_size, out_size;
while( r < read_size && in_buffer[r-1] != '\n' ) ++r;
leading_garbage = (l == 0) ? min( r, read_size / 2 ) : 0;
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 )
memset( mid_buffer, in_buffer[0], leading_garbage );
mid_size = LZ_compress_read( encoder, mid_buffer + leading_garbage,
buffer_size - leading_garbage );
if( mid_size < 0 )
{
fprintf( stderr, "lzcheck: 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 );
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 )
{
fprintf( stderr, "lzcheck: LZ_decompress_read error: %s\n",
LZ_strerror( LZ_decompress_errno( decoder ) ) );
retval = 3; break;
}
}
if( out_size != in_size || memcmp( in_buffer + l, out_buffer, out_size ) )
{
fprintf( stderr, "lzcheck: Sync error at pos %d. in_size = %d, out_size = %d.\n",
l, in_size, out_size );
for( i = 0; i < in_size; ++i )
fputc( in_buffer[l+i], stderr );
if( in_buffer[l+in_size-1] != '\n' )
fputc( '\n', stderr );
for( i = 0; i < out_size; ++i )
fputc( out_buffer[i], stderr );
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 )
{
fprintf( stderr, "lzcheck: Can't restart member: %s\n",
LZ_strerror( LZ_decompress_errno( decoder ) ) );
retval = 3; break;
}
size = 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 )
{
fprintf( stderr, "lzcheck: 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 );
return retval;
}
int main( const int argc, const char * const argv[] )
{
FILE * file;
int retval;
if( argc < 2 )
{
fputs( "Usage: lzcheck filename.txt\n", stderr );
return 1;
}
file = fopen( argv[1], "rb" );
if( !file )
{
fprintf( stderr, "lzcheck: Can't open file '%s' for reading.\n", argv[1] );
return 1;
}
/* fprintf( stderr, "lzcheck: Testing file '%s'\n", argv[1] ); */
retval = lzcheck( file, 65535 );
if( retval == 0 )
{ rewind( file ); retval = lzcheck( file, 1 << 20 ); }
fclose( file );
return retval;
}
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