axmol/cocos2dx/platform/win32/ZipUtils.cpp

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

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#include <zlib.h>

#include "ZipUtils.h"
#include "ccMacros.h"

namespace cocos2d
{
	int ZipUtils::inflateMemory_(unsigned char *in, unsigned int inLength, unsigned char **out, unsigned int *outLength)
	{
#if 1
		/* ret value */
		int err = Z_OK;

		/* 256k initial decompress buffer */
		int bufferSize = 256 * 1024;
		*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) 
			{
				// memory in iPhone is precious
				// Should buffer factor be 1.5 instead of 2 ?
#define BUFFER_INC_FACTOR (2)
				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;
#else
		return 0;
#endif
	}

	int ZipUtils::inflateMemory(unsigned char *in, unsigned int inLength, unsigned char **out)
	{
#if 1
		unsigned int outLength = 0;
		int err = inflateMemory_(in, inLength, out, &outLength);

		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;
#else
		return 0;
#endif
	}

} // end of namespace cocos2d