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 Copyright (c) 2010-2012 cocos2d-x.org
 Copyright (c) 2013-2017 Chukong Technologies Inc.

 http://www.cocos2d-x.org
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/

// FIXME: hack, must be included before ziputils
#ifdef MINIZIP_FROM_SYSTEM
#include <minizip/unzip.h>
#else // from our embedded sources
#include "unzip.h"
#endif

#include "ZipUtils.h"

#include <zlib.h>
#include <assert.h>
#include <stdlib.h>

#include <map>

// FIXME: Other platforms should use upstream minizip like mingw-w64  
#ifdef MINIZIP_FROM_SYSTEM
#define unzGoToFirstFile64(A,B,C,D) unzGoToFirstFile2(A,B,C,D, NULL, 0, NULL, 0)
#define unzGoToNextFile64(A,B,C,D) unzGoToNextFile2(A,B,C,D, NULL, 0, NULL, 0)
#endif

// --------------------- ZipUtils ---------------------

// memory in iPhone is precious
// Should buffer factor be 1.5 instead of 2 ?
#define BUFFER_INC_FACTOR (2)

int ZipUtils::inflateMemoryWithHint(unsigned char *in, ssize_t inLength, unsigned char **out, ssize_t *outLength, ssize_t outLengthHint)
{
    /* ret value */
    int err = Z_OK;
    
    ssize_t bufferSize = outLengthHint;
    *out = (unsigned char*)malloc(bufferSize);
    
    z_stream d_stream; /* decompression stream */
    d_stream.zalloc = (alloc_func)0;
    d_stream.zfree = (free_func)0;
    d_stream.opaque = (voidpf)0;
    
    d_stream.next_in  = in;
    d_stream.avail_in = static_cast<unsigned int>(inLength);
    d_stream.next_out = *out;
    d_stream.avail_out = static_cast<unsigned int>(bufferSize);
    
    /* window size to hold 256k */
    if( (err = inflateInit2(&d_stream, 15 + 32)) != Z_OK )
        return err;
    
    for (;;)
    {
        err = inflate(&d_stream, Z_NO_FLUSH);
        
        if (err == Z_STREAM_END)
        {
            break;
        }
        
        switch (err)
        {
            case Z_NEED_DICT:
                err = Z_DATA_ERROR;
            case Z_DATA_ERROR:
            case Z_MEM_ERROR:
                inflateEnd(&d_stream);
                return err;
        }
        
        // not enough memory ?
        if (err != Z_STREAM_END)
        {
            *out = (unsigned char*)realloc(*out, bufferSize * BUFFER_INC_FACTOR);
            
            /* not enough memory, ouch */
            if (! *out )
            {
//                CCLOG("cocos2d: ZipUtils: realloc failed");
                inflateEnd(&d_stream);
                return Z_MEM_ERROR;
            }
            
            d_stream.next_out = *out + bufferSize;
            d_stream.avail_out = static_cast<unsigned int>(bufferSize);
            bufferSize *= BUFFER_INC_FACTOR;
        }
    }
    
    *outLength = bufferSize - d_stream.avail_out;
    err = inflateEnd(&d_stream);
    return err;
}

ssize_t ZipUtils::inflateMemoryWithHint(unsigned char *in, ssize_t inLength, unsigned char **out, ssize_t outLengthHint)
{
    ssize_t outLength = 0;
    int err = inflateMemoryWithHint(in, inLength, out, &outLength, outLengthHint);
    
    if (err != Z_OK || *out == nullptr) {
        if (err == Z_MEM_ERROR)
        {
//            CCLOG("cocos2d: ZipUtils: Out of memory while decompressing map data!");
        } else
            if (err == Z_VERSION_ERROR)
            {
//                CCLOG("cocos2d: ZipUtils: Incompatible zlib version!");
            } else
                if (err == Z_DATA_ERROR)
                {
//                    CCLOG("cocos2d: ZipUtils: Incorrect zlib compressed data!");
                }
                else
                {
//                    CCLOG("cocos2d: ZipUtils: Unknown error while decompressing map data!");
                }

        if(*out) {
            free(*out);
            *out = nullptr;
        }
        outLength = 0;
    }
    
    return outLength;
}

ssize_t ZipUtils::inflateMemory(unsigned char *in, ssize_t inLength, unsigned char **out)
{
    // 256k for hint
    return inflateMemoryWithHint(in, inLength, out, 256 * 1024);
}