mirror of https://github.com/axmolengine/axmol.git
220 lines
8.7 KiB
C++
220 lines
8.7 KiB
C++
/****************************************************************************
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Copyright (c) 2010 cocos2d-x.org
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http://www.cocos2d-x.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#ifndef __SUPPORT_ZIPUTILS_H__
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#define __SUPPORT_ZIPUTILS_H__
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#include <string>
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#include "CCPlatformDefine.h"
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namespace cocos2d
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{
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/* XXX: pragma pack ??? */
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/** @struct CCZHeader
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*/
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struct CCZHeader {
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unsigned char sig[4]; // signature. Should be 'CCZ!' 4 bytes
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unsigned short compression_type; // should 0
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unsigned short version; // should be 2 (although version type==1 is also supported)
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unsigned int reserved; // Reserved for users.
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unsigned int len; // size of the uncompressed file
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};
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enum {
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CCZ_COMPRESSION_ZLIB, // zlib format.
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CCZ_COMPRESSION_BZIP2, // bzip2 format (not supported yet)
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CCZ_COMPRESSION_GZIP, // gzip format (not supported yet)
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CCZ_COMPRESSION_NONE, // plain (not supported yet)
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};
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class CC_DLL ZipUtils
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{
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public:
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/**
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* Inflates either zlib or gzip deflated memory. The inflated memory is
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* expected to be freed by the caller.
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*
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* It will allocate 256k for the destination buffer. If it is not enough it will multiply the previous buffer size per 2, until there is enough memory.
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* @returns the length of the deflated buffer
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*
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@since v0.8.1
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*/
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static int ccInflateMemory(unsigned char *in, unsigned int inLength, unsigned char **out);
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/**
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* Inflates either zlib or gzip deflated memory. The inflated memory is
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* expected to be freed by the caller.
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*
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* outLenghtHint is assumed to be the needed room to allocate the inflated buffer.
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*
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* @returns the length of the deflated buffer
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*
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@since v1.0.0
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*/
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static int ccInflateMemoryWithHint(unsigned char *in, unsigned int inLength, unsigned char **out, unsigned int outLenghtHint);
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/** inflates a GZip file into memory
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*
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* @returns the length of the deflated buffer
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*
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* @since v0.99.5
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*/
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static int ccInflateGZipFile(const char *filename, unsigned char **out);
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/** inflates a CCZ file into memory
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*
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* @returns the length of the deflated buffer
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*
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* @since v0.99.5
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*/
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static int ccInflateCCZFile(const char *filename, unsigned char **out);
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/** Sets the pvr.ccz encryption key parts separately for added
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* security.
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*
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* Example: If the key used to encrypt the pvr.ccz file is
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* 0xaaaaaaaabbbbbbbbccccccccdddddddd you will call this function 4
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* different times, preferably from 4 different source files, as follows
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*
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* ZipUtils::ccSetPvrEncryptionKeyPart(0, 0xaaaaaaaa);
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* ZipUtils::ccSetPvrEncryptionKeyPart(1, 0xbbbbbbbb);
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* ZipUtils::ccSetPvrEncryptionKeyPart(2, 0xcccccccc);
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* ZipUtils::ccSetPvrEncryptionKeyPart(3, 0xdddddddd);
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*
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* Splitting the key into 4 parts and calling the function
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* from 4 different source files increases the difficulty to
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* reverse engineer the encryption key. Be aware that encrpytion
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* is *never* 100% secure and the key code can be cracked by
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* knowledgable persons.
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*
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* IMPORTANT: Be sure to call ccSetPvrEncryptionKey or
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* ccSetPvrEncryptionKeyPart with all of the key parts *before* loading
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* the spritesheet or decryption will fail and the spritesheet
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* will fail to load.
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*
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* @param index part of the key [0..3]
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* @param value value of the key part
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*/
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static void ccSetPvrEncryptionKeyPart(int index, unsigned int value);
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/** Sets the pvr.ccz encryption key.
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*
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* Example: If the key used to encrypt the pvr.ccz file is
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* 0xaaaaaaaabbbbbbbbccccccccdddddddd you will call this function with
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* the key split into 4 parts as follows
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*
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* ZipUtils::ccSetPvrEncryptionKey(0xaaaaaaaa, 0xbbbbbbbb, 0xcccccccc, 0xdddddddd);
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*
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* Note that using this function makes it easier to reverse engineer and
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* discover the complete key because the key parts are present in one
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* function call.
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*
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* IMPORTANT: Be sure to call ccSetPvrEncryptionKey or
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* ccSetPvrEncryptionKeyPart with all of the key parts *before* loading
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* the spritesheet or decryption will fail and the spritesheet
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* will fail to load.
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*
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* @param keyPart1 the key value part 1.
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* @param keyPart2 the key value part 2.
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* @param keyPart3 the key value part 3.
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* @param keyPart4 the key value part 4.
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*/
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static void ccSetPvrEncryptionKey(unsigned int keyPart1, unsigned int keyPart2, unsigned int keyPart3, unsigned int keyPart4);
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private:
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static int ccInflateMemoryWithHint(unsigned char *in, unsigned int inLength, unsigned char **out, unsigned int *outLength,
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unsigned int outLenghtHint);
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static inline void ccDecodeEncodedPvr (unsigned int *data, int len);
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static inline unsigned int ccChecksumPvr(const unsigned int *data, int len);
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static unsigned int s_uEncryptedPvrKeyParts[4];
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static unsigned int s_uEncryptionKey[1024];
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static bool s_bEncryptionKeyIsValid;
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};
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// forward declaration
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class ZipFilePrivate;
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/**
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* Zip file - reader helper class.
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*
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* It will cache the file list of a particular zip file with positions inside an archive,
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* so it would be much faster to read some particular files or to check their existance.
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*
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* @since v2.0.5
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*/
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class ZipFile
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{
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public:
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/**
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* Constructor, open zip file and store file list.
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*
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* @param zipFile Zip file name
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* @param filter The first part of file names, which should be accessible.
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* For example, "assets/". Other files will be missed.
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*
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* @since v2.0.5
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*/
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ZipFile(const std::string &zipFile, const std::string &filter = std::string());
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virtual ~ZipFile();
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/**
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* Regenerate accessible file list based on a new filter string.
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*
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* @param filter New filter string (first part of files names)
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* @return true whenever zip file is open successfully and it is possible to locate
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* at least the first file, false otherwise
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*
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* @since v2.0.5
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*/
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bool setFilter(const std::string &filter);
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/**
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* Check does a file exists or not in zip file
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*
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* @param fileName File to be checked on existance
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* @return true whenever file exists, false otherwise
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*
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* @since v2.0.5
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*/
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bool fileExists(const std::string &fileName) const;
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/**
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* Get resource file data from a zip file.
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* @param fileName File name
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* @param[out] pSize If the file read operation succeeds, it will be the data size, otherwise 0.
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* @return Upon success, a pointer to the data is returned, otherwise NULL.
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* @warning Recall: you are responsible for calling delete[] on any Non-NULL pointer returned.
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*
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* @since v2.0.5
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*/
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unsigned char *getFileData(const std::string &fileName, unsigned long *pSize);
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private:
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/** Internal data like zip file pointer / file list array and so on */
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ZipFilePrivate *_data;
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};
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} // end of namespace cocos2d
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#endif // __SUPPORT_ZIPUTILS_H__
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