From 4b2126b14346d29e15ddd4867930e96c857e168c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 7 Nov 2015 14:46:00 +0100 Subject: Merging upstream version 1.3. Signed-off-by: Daniel Baumann --- bbexample.cc | 210 ----------------------------------------------------------- 1 file changed, 210 deletions(-) delete mode 100644 bbexample.cc (limited to 'bbexample.cc') diff --git a/bbexample.cc b/bbexample.cc deleted file mode 100644 index df91300..0000000 --- a/bbexample.cc +++ /dev/null @@ -1,210 +0,0 @@ -/* Buff to buff example - A test program for the lzlib library - Copyright (C) 2010, 2011 Antonio Diaz Diaz. - - This program is free software: you have unlimited permission - to copy, distribute and modify it. - - Usage is: - bbexample filename - - This program is an example of how buffer-to-buffer - compression/decompression can be implemented using lzlib. -*/ - -#ifndef __cplusplus -#include -#endif -#include -#include -#include -#include -#include - -#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 - - -// Compresses `size' bytes from `data'. Returns the address of a -// malloc'd buffer containing the compressed data and its size in -// `*out_sizep'. -// In case of error, returns 0 and does not modify `*out_sizep'. - -uint8_t * bbcompress( const uint8_t * const data, const int size, - int * const out_sizep ) - { - int dict_size = 8 << 20; // 8 MiB - const int match_len_limit = 36; - const long long member_size = LLONG_MAX; - if( dict_size > size ) dict_size = size; - if( dict_size < LZ_min_dictionary_size() ) - dict_size = LZ_min_dictionary_size(); - struct LZ_Encoder * encoder = - LZ_compress_open( dict_size, match_len_limit, member_size ); - if( !encoder || LZ_compress_errno( encoder ) != LZ_ok ) - { LZ_compress_close( encoder ); return 0; } - - const int delta_size = (size < 256) ? 64 : size / 4; // size may be zero - int new_data_size = delta_size; // initial size - uint8_t * new_data = (uint8_t *)malloc( new_data_size ); - if( !new_data ) - { LZ_compress_close( encoder ); return 0; } - - int new_pos = 0; - int written = 0; - bool error = false; - while( true ) - { - if( LZ_compress_write_size( encoder ) > 0 ) - { - if( written < size ) - { - const int wr = LZ_compress_write( encoder, data + written, - size - written ); - if( wr < 0 ) { error = true; break; } - written += wr; - } - if( written >= size ) LZ_compress_finish( encoder ); - } - const int rd = LZ_compress_read( encoder, new_data + new_pos, - new_data_size - new_pos ); - if( rd < 0 ) { error = true; break; } - new_pos += rd; - if( LZ_compress_finished( encoder ) == 1 ) break; - if( new_pos >= new_data_size ) - { - void * const tmp = realloc( new_data, new_data_size + delta_size ); - if( !tmp ) { error = true; break; } - new_data = (uint8_t *)tmp; - new_data_size += delta_size; - } - } - - if( LZ_compress_close( encoder ) < 0 ) error = true; - if( error ) { free( new_data ); return 0; } - *out_sizep = new_pos; - return new_data; - } - - -// Decompresses `size' bytes from `data'. Returns the address of a -// malloc'd buffer containing the decompressed data and its size in -// `*out_sizep'. -// In case of error, returns 0 and does not modify `*out_sizep'. - -uint8_t * bbdecompress( const uint8_t * const data, const int size, - int * const out_sizep ) - { - struct LZ_Decoder * decoder = LZ_decompress_open(); - if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok ) - { LZ_decompress_close( decoder ); return 0; } - - const int delta_size = size; - int new_data_size = delta_size; // initial size - uint8_t * new_data = (uint8_t *)malloc( new_data_size ); - if( !new_data ) - { LZ_decompress_close( decoder ); return 0; } - - int new_pos = 0; - int written = 0; - bool error = false; - while( true ) - { - if( LZ_decompress_write_size( decoder ) > 0 ) - { - if( written < size ) - { - const int wr = LZ_decompress_write( decoder, data + written, - size - written ); - if( wr < 0 ) { error = true; break; } - written += wr; - } - if( written >= size ) LZ_decompress_finish( decoder ); - } - const int rd = LZ_decompress_read( decoder, new_data + new_pos, - new_data_size - new_pos ); - if( rd < 0 ) { error = true; break; } - new_pos += rd; - if( LZ_decompress_finished( decoder ) == 1 ) break; - if( new_pos >= new_data_size ) - { - void * const tmp = realloc( new_data, new_data_size + delta_size ); - if( !tmp ) { error = true; break; } - new_data = (uint8_t *)tmp; - new_data_size += delta_size; - } - } - - if( LZ_decompress_close( decoder ) < 0 ) error = true; - if( error ) { free( new_data ); return 0; } - *out_sizep = new_pos; - return new_data; - } - - -int main( const int argc, const char * const argv[] ) - { - if( argc < 2 ) - { - fprintf( stderr, "Usage: bbexample filename\n" ); - return 1; - } - - FILE *file = fopen( argv[1], "rb" ); - if( !file ) - { - fprintf( stderr, "bbexample: Can't open file `%s' for reading\n", argv[1] ); - return 1; - } - - const int in_buffer_size = 1 << 20; - uint8_t * const in_buffer = (uint8_t *)malloc( in_buffer_size ); - if( !in_buffer ) - { - fprintf( stderr, "bbexample: Not enough memory.\n" ); - return 1; - } - const int in_size = fread( in_buffer, 1, in_buffer_size, file ); - if( in_size >= in_buffer_size ) - { - fprintf( stderr, "bbexample: Input file `%s' is too big.\n", argv[1] ); - return 1; - } - fclose( file ); - - int mid_size = 0; - uint8_t * const mid_buffer = bbcompress( in_buffer, in_size, &mid_size ); - if( !mid_buffer ) - { - fprintf( stderr, "bbexample: Not enough memory or compress error.\n" ); - return 1; - } - - int out_size = 0; - uint8_t * const out_buffer = bbdecompress( mid_buffer, mid_size, &out_size ); - if( !out_buffer ) - { - fprintf( stderr, "bbexample: Not enough memory or decompress error.\n" ); - return 1; - } - - if( in_size != out_size || - ( out_size > 0 && memcmp( in_buffer, out_buffer, out_size ) ) ) - { - fprintf( stderr, "bbexample: Decompressed data differs from original.\n" ); - return 1; - } - - free( out_buffer ); - free( mid_buffer ); - free( in_buffer ); - return 0; - } -- cgit v1.2.3