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 "CCFileUtils.h"

namespace cocos2d
{
    // 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;
        
        int fileLen = 0;
        compressed = CCFileUtils::sharedFileUtils()->getFileData(path, "rb", (unsigned long *)(&fileLen));
         // int fileLen  = CCFileUtils::sharedFileUtils()->ccLoadFileIntoMemory( path, &compressed );

         if( fileLen < 0 ) 
         {
             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;
    }

} // end of namespace cocos2d