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-rw-r--r--lzcheck.cc111
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diff --git a/lzcheck.cc b/lzcheck.cc
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+/* Lzcheck - A test program for the lzlib library
+ Copyright (C) 2009 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.
+*/
+
+#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
+
+
+int main( const int argc, const char * argv[] )
+ {
+ if( argc < 2 )
+ {
+ std::fprintf( stderr, "Usage: lzcheck filename.txt\n" );
+ return 1;
+ }
+
+ FILE *f = std::fopen( argv[1], "rb" );
+ if( !f )
+ {
+ std::fprintf( stderr, "Can't open file `%s' for reading\n", argv[1] );
+ return 1;
+ }
+
+ const int in_buffer_size = 1 << 20;
+ const int mid_buffer_size = 65536;
+ const int out_buffer_size = in_buffer_size;
+ uint8_t in_buffer[in_buffer_size];
+ uint8_t mid_buffer[mid_buffer_size];
+ uint8_t out_buffer[out_buffer_size];
+ const int in_size = std::fread( in_buffer, 1, in_buffer_size, f );
+ if( in_size >= in_buffer_size )
+ {
+ std::fprintf( stderr, "input file `%s' too big.\n", argv[1] );
+ return 1;
+ }
+ std::fclose( f );
+
+ const int dictionary_size = in_buffer_size;
+ const int match_len_limit = 80;
+ const long long member_size = LLONG_MAX;
+ void * 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;
+ }
+
+ void * 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;
+ }
+
+ for( int l = 0, r = 0; r < in_size; l = r )
+ {
+ while( ++r < in_size && in_buffer[r-1] != '\n' ) ;
+ LZ_compress_write( encoder, in_buffer + l, r - l );
+ LZ_compress_sync_flush( encoder );
+ int mid_size = LZ_compress_read( encoder, mid_buffer, mid_buffer_size );
+ LZ_decompress_write( decoder, mid_buffer, mid_size );
+ int out_size = LZ_decompress_read( decoder, out_buffer, out_buffer_size );
+
+ if( out_size != r - l || std::memcmp( in_buffer + l, out_buffer, out_size ) )
+ {
+ std::printf( "sync error at pos %d. in_size = %d, out_size = %d\n",
+ l, r - l, out_size );
+ for( int i = l; i < r; ++i ) std::putchar( in_buffer[i] );
+ if( in_buffer[r-1] != '\n' ) std::putchar( '\n' );
+ for( int i = 0; i < out_size; ++i ) std::putchar( out_buffer[i] );
+ std::putchar( '\n' );
+ }
+ }
+
+ LZ_decompress_close( decoder );
+ LZ_compress_close( encoder );
+ return 0;
+ }