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

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The above copyright notice and this permission notice shall be included in
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****************************************************************************/
#include <zlib.h>
#include <assert.h>
#include <stdlib.h>

#include "ZipUtils.h"
#include "ccMacros.h"
#include "platform/CCFileUtils.h"
#include "unzip.h"
#include <map>

NS_CC_BEGIN

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

// 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;
}

// --------------------- ZipFile ---------------------
// from unzip.cpp
#define UNZ_MAXFILENAMEINZIP 256

struct ZipEntryInfo
{
    unz_file_pos pos;
    uLong uncompressed_size;
};

class ZipFilePrivate
{
public:
    unzFile zipFile;

    // std::unordered_map is faster if available on the platform
    typedef std::map<std::string, struct ZipEntryInfo> FileListContainer;
    FileListContainer fileList;
};

ZipFile::ZipFile(const std::string &zipFile, const std::string &filter)
    : m_data(new ZipFilePrivate)
{
    m_data->zipFile = unzOpen(zipFile.c_str());
    if (m_data->zipFile)
    {
        setFilter(filter);
    }
}

ZipFile::~ZipFile()
{
    if (m_data && m_data->zipFile)
    {
        unzClose(m_data->zipFile);
    }
    CC_SAFE_DELETE(m_data);
}

bool ZipFile::setFilter(const std::string &filter)
{
    bool ret = false;
    do
    {
        CC_BREAK_IF(!m_data);
        CC_BREAK_IF(!m_data->zipFile);

        // clear existing file list
        m_data->fileList.clear();

        // UNZ_MAXFILENAMEINZIP + 1 - it is done so in unzLocateFile
        char szCurrentFileName[UNZ_MAXFILENAMEINZIP + 1];
        unz_file_info64 fileInfo;

        // go through all files and store position information about the required files
        int err = unzGoToFirstFile64(m_data->zipFile, &fileInfo,
                szCurrentFileName, sizeof(szCurrentFileName) - 1);
        while (err == UNZ_OK)
        {
            unz_file_pos posInfo;
            int posErr = unzGetFilePos(m_data->zipFile, &posInfo);
            if (posErr == UNZ_OK)
            {
                std::string currentFileName = szCurrentFileName;
                // cache info about filtered files only (like 'assets/')
                if (filter.empty()
                    || currentFileName.substr(0, filter.length()) == filter)
                {
                    ZipEntryInfo entry;
                    entry.pos = posInfo;
                    entry.uncompressed_size = (uLong)fileInfo.uncompressed_size;
                    m_data->fileList[currentFileName] = entry;
                }
            }
            // next file - also get the information about it
            err = unzGoToNextFile64(m_data->zipFile, &fileInfo,
                    szCurrentFileName, sizeof(szCurrentFileName) - 1);
        }
        ret = true;

    } while(false);

    return ret;
}

bool ZipFile::fileExists(const std::string &fileName) const
{
    bool ret = false;
    do
    {
        CC_BREAK_IF(!m_data);

        ret = m_data->fileList.find(fileName) != m_data->fileList.end();
    } while(false);

    return ret;
}

unsigned char *ZipFile::getFileData(const std::string &fileName, unsigned long *pSize)
{
    unsigned char * pBuffer = NULL;
    if (pSize)
    {
        *pSize = 0;
    }

    do
    {
        CC_BREAK_IF(!m_data->zipFile);
        CC_BREAK_IF(fileName.empty());

        ZipFilePrivate::FileListContainer::const_iterator it = m_data->fileList.find(fileName);
        CC_BREAK_IF(it ==  m_data->fileList.end());

        ZipEntryInfo fileInfo = it->second;

        int nRet = unzGoToFilePos(m_data->zipFile, &fileInfo.pos);
        CC_BREAK_IF(UNZ_OK != nRet);

        nRet = unzOpenCurrentFile(m_data->zipFile);
        CC_BREAK_IF(UNZ_OK != nRet);

        pBuffer = new unsigned char[fileInfo.uncompressed_size];
        int nSize = 0;
        nSize = unzReadCurrentFile(m_data->zipFile, pBuffer, fileInfo.uncompressed_size);
        CCAssert(nSize == 0 || nSize == (int)fileInfo.uncompressed_size, "the file size is wrong");

        if (pSize)
        {
            *pSize = fileInfo.uncompressed_size;
        }
        unzCloseCurrentFile(m_data->zipFile);
    } while (0);

    return pBuffer;
}

NS_CC_END