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148 cycrow 1 
// XLib.cpp : Defines the functions for the static library.
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//
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#include "pch.h"
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#include "framework.h"
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unsigned char* UnPCKFile(const char* file, size_t* len, bool nocrypt)
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{
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	FileIO File(file);
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	if (!File.startRead()) return NULL;
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	size_t size;
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	unsigned char* data = File.readAll(&size);
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	if (data) {
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		unsigned char* unData = UnPCKData(data, size, len, nocrypt);
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		delete data;
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		return unData;
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	}
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	return NULL;
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}
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unsigned char* UnPCKData(unsigned char* data, size_t datasize, size_t* len) { return UnPCKData(data, datasize, len, IsDataPCK(data, datasize)); }
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unsigned char* UnPCKData(unsigned char* data, size_t datasize, size_t* len, bool nocrypt)
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{
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	bool isPCK = IsDataPCK(data, datasize);
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	unsigned char* newData = data;
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	unsigned char* tempData = NULL;
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	if (nocrypt)
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	{
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		tempData = new unsigned char[datasize];
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		newData = tempData;
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		memcpy(newData, data, datasize);
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		unsigned char magic = newData[0] ^ 0xC8;
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		for (size_t i = 1; i < datasize; i++)
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			newData[i] ^= magic;
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		++newData;
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		--datasize;
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	}
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	// create data buffer
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	size_t* uncomprLenSize = (size_t*)(newData + (datasize - 4));
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	unsigned long uncomprLen = (unsigned long)*uncomprLenSize;
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	if (uncomprLen > (datasize * 100))
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	{
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		if (tempData) delete[]tempData;
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		*len = 0;
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		return NULL;
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	}
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	unsigned char* uncompr = new unsigned char[uncomprLen + 1];
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	if (!uncompr) {
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		if (tempData) delete[]tempData;
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		return NULL;
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	}
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	memset(uncompr, 0, sizeof(uncompr));
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	// find header size
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	unsigned char* buf = newData + PCKHEADERSIZE;
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	//	buf = data + (6 + sizeof(time_t));
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	char flag = newData[3];
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	if (flag & GZ_FLAG_EXTRA)
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	{
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		size_t xlen = *((short int*)(buf));
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		buf += xlen;
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	}
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	if (flag & GZ_FLAG_FILENAME)
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	{
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		char* origname = (char*)(buf);
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		buf += strlen(origname) + 1;
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	}
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	if (flag & GZ_FLAG_COMMENT)
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	{
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		char* comment = (char*)(buf);
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		buf += strlen(comment) + 1;
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	}
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	if (flag & GZ_FLAG_HCRC)
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		buf += 2;
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	long bufSize = (long)(datasize - (buf - newData) - 8);
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	int err = uncompress2(uncompr, &uncomprLen, buf, bufSize);
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	if (err != Z_OK)
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	{
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		if (tempData) delete[]tempData;
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		delete uncompr;
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		*len = 0;
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		return NULL;
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	}
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	*len = uncomprLen;
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	uncompr[uncomprLen] = '\0';
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	if (tempData) delete[]tempData;
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	return uncompr;
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}
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bool IsDataPCK(const unsigned char* data, size_t size)
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{
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	if (size >= 3)
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	{
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		unsigned char magic = data[0] ^ 0xC8;
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		return ((data[1] ^ magic) == 0x1F && (data[2] ^ magic) == 0x8B);
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	}
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	else
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		return false;
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}