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authorDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 13:46:00 +0000
committerDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 13:46:00 +0000
commit4b2126b14346d29e15ddd4867930e96c857e168c (patch)
tree5d7d29e06e931313b47e55c2baf16914efdd62e5 /bbexample.cc
parentAdding debian version 1.2-1. (diff)
downloadlzlib-4b2126b14346d29e15ddd4867930e96c857e168c.tar.xz
lzlib-4b2126b14346d29e15ddd4867930e96c857e168c.zip
Merging upstream version 1.3.
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Diffstat (limited to 'bbexample.cc')
-rw-r--r--bbexample.cc210
1 files changed, 0 insertions, 210 deletions
diff --git a/bbexample.cc b/bbexample.cc
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-/* 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 <stdbool.h>
-#endif
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#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
-
-
-// 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;
- }