| /**********************************************************************
|
| // @@@ START COPYRIGHT @@@
|
| // |
| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| // |
| // @@@ END COPYRIGHT @@@
|
| ********************************************************************/
|
|
|
| #include "Compression.h"
|
|
|
| #include "zlib.h"
|
| #include <stdlib.h>
|
|
|
|
|
| CCompression::CCompression()
|
| {
|
| }
|
|
|
| CCompression::~CCompression()
|
| {
|
| }
|
|
|
|
|
| bool CCompression::compress(unsigned char *input, unsigned long input_size, int level, unsigned char **output, unsigned long& output_size)
|
| {
|
| int ret, flush;
|
| z_stream strm;
|
| strm.zalloc = Z_NULL;
|
| strm.zfree = Z_NULL;
|
| strm.opaque = Z_NULL;
|
| ret = deflateInit(&strm, level);
|
| if (ret != Z_OK)
|
| return ret;
|
|
|
| strm.next_in = input;
|
| strm.avail_in = input_size;
|
| strm.data_type = Z_BINARY;
|
|
|
| output_size = deflateBound(&strm,input_size);
|
| *output = new unsigned char[output_size];
|
| if(!*output)
|
| {
|
| deflateEnd(&strm);
|
| return false;
|
| }
|
|
|
| strm.avail_out = output_size;
|
| strm.next_out = (Bytef*)*output;
|
| flush = Z_FINISH;
|
|
|
| ret = deflate(&strm, flush);
|
| deflateEnd(&strm);
|
| if(ret == Z_STREAM_END) /* have to be Z_STREAM_END */
|
| {
|
| if((output_size-strm.avail_out)>=input_size)
|
| {
|
| return false;
|
| }
|
| output_size-=strm.avail_out;
|
| return true;
|
| }
|
| else
|
| return false;
|
| }
|
|
|
|
|
|
|
| bool CCompression::expand(unsigned char *input, unsigned long input_size, unsigned char **output, unsigned long& output_size, int& error)
|
| {
|
| int ret;
|
| z_stream strm;
|
|
|
| if(!input_size)
|
| {
|
| output_size = 0;
|
| return false;
|
| }
|
|
|
| strm.zalloc = Z_NULL;
|
| strm.zfree = Z_NULL;
|
| strm.opaque = Z_NULL;
|
| strm.avail_in = 0;
|
| strm.next_in = Z_NULL;
|
| ret = inflateInit(&strm);
|
| if (ret != Z_OK)
|
| return ret;
|
|
|
| strm.next_in = input;
|
| strm.avail_in = input_size;
|
| strm.next_out = (Bytef*)*output;
|
| strm.avail_out=output_size;
|
| ret = inflate(&strm, Z_FINISH);
|
|
|
| inflateEnd(&strm);
|
|
|
| if(ret == Z_STREAM_END && strm.avail_out == 0)
|
| {
|
| error=0;
|
| return true;
|
| }
|
|
|
| error=ret;
|
| output_size = 0;
|
| return false;
|
| }
|
|
|
