axmol/cocos2dx/support/zip_support/ZipUtils.cpp

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

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

#include "ZipUtils.h"
#include "ccMacros.h"
#include "platform/CCFileUtils.h"

NS_CC_BEGIN

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

int ZipUtils::ccInflateMemoryWithHint(unsigned char *in, unsigned int inLength, unsigned char **out, unsigned int *outLength, unsigned int outLenghtHint)
{
    /* ret value */
    int err = Z_OK;

    int bufferSize = outLenghtHint;
    *out = new unsigned char[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 = inLength;
    d_stream.next_out = *out;
    d_stream.avail_out = 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) 
        {
            delete [] *out;
            *out = new unsigned char[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 = bufferSize;
            bufferSize *= BUFFER_INC_FACTOR;
        }
    }

    *outLength = bufferSize - d_stream.avail_out;
    err = inflateEnd(&d_stream);
    return err;
}

int ZipUtils::ccInflateMemoryWithHint(unsigned char *in, unsigned int inLength, unsigned char **out, unsigned int outLengthHint)
{
    unsigned int outLength = 0;
    int err = ccInflateMemoryWithHint(in, inLength, out, &outLength, outLengthHint);

    if (err != Z_OK || *out == NULL) {
        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!");
        }

        delete[] *out;
        *out = NULL;
        outLength = 0;
    }

    return outLength;
}

int ZipUtils::ccInflateMemory(unsigned char *in, unsigned int inLength, unsigned char **out)
{
    // 256k for hint
    return ccInflateMemoryWithHint(in, inLength, out, 256 * 1024);
}

int ZipUtils::ccInflateGZipFile(const char *path, unsigned char **out)
{
    int len;
    unsigned int offset = 0;

    CCAssert(out, "");
    CCAssert(&*out, "");

    gzFile inFile = gzopen(path, "rb");
    if( inFile == NULL ) {
        CCLOG("cocos2d: ZipUtils: error open gzip file: %s", path);
        return -1;
    }

    /* 512k initial decompress buffer */
    unsigned int bufferSize = 512 * 1024;
    unsigned int totalBufferSize = bufferSize;

    *out = (unsigned char*)malloc( bufferSize );
    if( ! out ) 
    {
        CCLOG("cocos2d: ZipUtils: out of memory");
        return -1;
    }

    for (;;) {
        len = gzread(inFile, *out + offset, bufferSize);
        if (len < 0) 
        {
            CCLOG("cocos2d: ZipUtils: error in gzread");
            free( *out );
            *out = NULL;
            return -1;
        }
        if (len == 0)
        {
            break;
        }

        offset += len;

        // finish reading the file
        if( (unsigned int)len < bufferSize )
        {
            break;
        }

        bufferSize *= BUFFER_INC_FACTOR;
        totalBufferSize += bufferSize;
        unsigned char *tmp = (unsigned char*)realloc(*out, totalBufferSize );

        if( ! tmp ) 
        {
            CCLOG("cocos2d: ZipUtils: out of memory");
            free( *out );
            *out = NULL;
            return -1;
        }

        *out = tmp;
    }

    if (gzclose(inFile) != Z_OK)
    {
        CCLOG("cocos2d: ZipUtils: gzclose failed");
    }

    return offset;
}

int ZipUtils::ccInflateCCZFile(const char *path, unsigned char **out)
{
     CCAssert(out, "");
     CCAssert(&*out, "");

     // load file into memory
     unsigned char* compressed = NULL;
    
     unsigned long fileLen = 0;
     compressed = CCFileUtils::sharedFileUtils()->getFileData(path, "rb", &fileLen);

     if(NULL == compressed || 0 == fileLen) 
     {
         CCLOG("cocos2d: Error loading CCZ compressed file");
         return -1;
     }

     struct CCZHeader *header = (struct CCZHeader*) compressed;

     // verify header
     if( header->sig[0] != 'C' || header->sig[1] != 'C' || header->sig[2] != 'Z' || header->sig[3] != '!' ) 
     {
         CCLOG("cocos2d: Invalid CCZ file");
         delete [] compressed;
         return -1;
     }

     // verify header version
     unsigned int version = CC_SWAP_INT16_BIG_TO_HOST( header->version );
     if( version > 2 ) 
     {
         CCLOG("cocos2d: Unsupported CCZ header format");
         delete [] compressed;
         return -1;
     }

     // verify compression format
     if( CC_SWAP_INT16_BIG_TO_HOST(header->compression_type) != CCZ_COMPRESSION_ZLIB ) 
     {
         CCLOG("cocos2d: CCZ Unsupported compression method");
         delete [] compressed;
         return -1;
     }

     unsigned int len = CC_SWAP_INT32_BIG_TO_HOST( header->len );

     *out = (unsigned char*)malloc( len );
     if(! *out )
     {
         CCLOG("cocos2d: CCZ: Failed to allocate memory for texture");
         delete [] compressed;
         return -1;
     }


     unsigned long destlen = len;
     unsigned long source = (unsigned long) compressed + sizeof(*header);
     int ret = uncompress(*out, &destlen, (Bytef*)source, fileLen - sizeof(*header) );

     delete [] compressed;

     if( ret != Z_OK )
     {
         CCLOG("cocos2d: CCZ: Failed to uncompress data");
         free( *out );
         *out = NULL;
         return -1;
     }

     return len;
}

NS_CC_END