#include "progsint.h"
#include "qcc.h"

#if !defined(NO_ZLIB) && !defined(FTE_TARGET_WEB) && !defined(NACL)
#define AVAIL_ZLIB
#endif

#ifdef AVAIL_ZLIB
#ifdef _WIN32
#define ZEXPORT VARGS
#include <zlib.h>

#ifdef _WIN64
//# pragma comment (lib, "../libs/zlib64.lib") 
#else
//# pragma comment (lib, "../libs/zlib.lib") 
#endif
#else
#include <zlib.h>
#endif
#endif

pbool QC_decodeMethodSupported(int method)
{
	if (method == 0)
		return true;
	if (method == 1)
		return true;
	if (method == 2)
	{
#ifdef AVAIL_ZLIB
		return false;
#endif
	}
	return false;
}

char *QC_decode(progfuncs_t *progfuncs, int complen, int len, int method, const char *info, char *buffer)
{
	int i;
	if (method == 0)	//copy
	{
		if (complen != len) Sys_Error("lengths do not match");
		memcpy(buffer, info, len);		
	}
	else if (method == 1)	//xor encryption
	{
		if (complen != len) Sys_Error("lengths do not match");
		for (i = 0; i < len; i++)
			buffer[i] = info[i] ^ 0xA5;		
	}
#ifdef AVAIL_ZLIB
	else if (method == 2 || method == 8)	//compression (ZLIB)
	{
		z_stream strm = {
			(char*)info,
			complen,
			0,

			buffer,
			len,
			0,

			NULL,
			NULL,

			NULL,
			NULL,
			NULL,

			Z_BINARY,
			0,
			0
		};

		if (method == 8)
			inflateInit2(&strm, -MAX_WBITS);
		else
			inflateInit(&strm);
		if (Z_STREAM_END != inflate(&strm, Z_FINISH))	//decompress it in one go.
			Sys_Error("Failed block decompression\n");
		inflateEnd(&strm);
	}
#endif
	//add your decryption/decompression routine here.
	else
		Sys_Error("Bad file encryption routine\n");


	return buffer;
}

#if !defined(MINIMAL) && !defined(OMIT_QCC)
int QC_encodecrc(int len, char *in)
{
#ifdef AVAIL_ZLIB
	return crc32(0, in, len);
#else
	return 0;
#endif
}
void SafeWrite(int hand, const void *buf, long count);
int SafeSeek(int hand, int ofs, int mode);
//we are allowed to trash our input here.
int QC_encode(progfuncs_t *progfuncs, int len, int method, const char *in, int handle)
{
	if (method == 0) //copy, allows a lame pass-through.
	{		
		SafeWrite(handle, in, len);
		return len;
	}
	/*else if (method == 1)	//xor encryption, not secure. maybe useful for the string table.
	{
		for (i = 0; i < len; i++)
			in[i] = in[i] ^ 0xA5;
		SafeWrite(handle, in, len);
		return len;
	}*/
	else if (method == 2 || method == 8)	//compression (ZLIB)
	{
#ifdef AVAIL_ZLIB
		char out[8192];
		int i=0;

		z_stream strm = {
			(char *)in,
			len,
			0,

			out,
			sizeof(out),
			0,

			NULL,
			NULL,

			NULL,
			NULL,
			NULL,

			Z_BINARY,
			0,
			0
		};

		if (method == 8)
			deflateInit2(&strm, 9, Z_DEFLATED, -MAX_WBITS, 9, Z_DEFAULT_STRATEGY);		//zip deflate compression
		else
			deflateInit(&strm, Z_BEST_COMPRESSION);	//zlib compression
		while(deflate(&strm, Z_FINISH) == Z_OK)
		{
			SafeWrite(handle, out, sizeof(out) - strm.avail_out);	//compress in chunks of 8192. Saves having to allocate a huge-mega-big buffer
			i+=sizeof(out) - strm.avail_out;
			strm.next_out = out;
			strm.avail_out = sizeof(out);
		}
		SafeWrite(handle, out, sizeof(out) - strm.avail_out);
		i+=sizeof(out) - strm.avail_out;
		deflateEnd(&strm);
		return i;
#endif
		Sys_Error("ZLIB compression not supported in this build");
		return 0;
	}
	//add your compression/decryption routine here.
	else
	{
		Sys_Error("Wierd method");
		return 0;
	}
}
#endif

static int QC_ReadRawInt(const unsigned char *blob)
{
	return (blob[0]<<0) | (blob[1]<<8) | (blob[2]<<16) | (blob[3]<<24);
}
static int QC_ReadRawShort(const unsigned char *blob)
{
	return (blob[0]<<0) | (blob[1]<<8);
}
pbool QC_EnumerateFilesFromBlob(const void *blob, size_t blobsize, void (*cb)(const char *name, const void *compdata, size_t compsize, int method, size_t plainsize))
{
	unsigned int cdentries;
	unsigned int cdlen;
	const unsigned char *eocd;
	const unsigned char *cd;
	int nl,el,cl;
	if (blobsize < 22)
		return false;
	eocd = blob;
	eocd += blobsize-22;
	if (QC_ReadRawInt(eocd+0) != 0x06054b50)
		return false;
	if (QC_ReadRawShort(eocd+4) || QC_ReadRawShort(eocd+6) || QC_ReadRawShort(eocd+20) || QC_ReadRawShort(eocd+8) != QC_ReadRawShort(eocd+10))
		return false;
	cd = blob;
	cd += QC_ReadRawInt(eocd+16);
	cdlen = QC_ReadRawInt(eocd+12);
	cdentries = QC_ReadRawInt(eocd+10);
	if (cd+cdlen>=(const unsigned char*)blob+blobsize)
		return false;


	for(; cdentries --> 0; cd += 46 + nl+el+cl)
	{
		if (QC_ReadRawInt(cd+0) != 0x02014b50)
			break;
		nl = QC_ReadRawShort(cd+28);
		el = QC_ReadRawShort(cd+30);
		cl = QC_ReadRawShort(cd+32);

		//1=encrypted
		//2,4=encoder flags
		//8=crc etc info is dodgy
		//10=enhanced deflate
		//20=patchdata
		//40=strong encryption
		//80,100,200,400=unused
		//800=utf-8
		//1000=enh comp
		//2000=masked localheader
		//4000,8000=reserved
		if (QC_ReadRawShort(cd+8) & ~0x80e)
			continue;

		{
			const unsigned char *le = (const unsigned char*)blob + QC_ReadRawInt(cd+42);
			unsigned int csize, usize, method;
			char name[256];

			if (QC_ReadRawInt(le+0) != 0x04034b50)
				continue;
			if (QC_ReadRawShort(le+6) & ~0x80e)	//general purpose flags
				continue;
			method = QC_ReadRawShort(le+8);
			if (method != 0 && method != 8)
				continue;
			if (nl != QC_ReadRawShort(le+26))
				continue;	//name is weird...
			if (el != QC_ReadRawShort(le+28))
				continue;	//name is weird...

			csize = QC_ReadRawInt(le+18);
			usize = QC_ReadRawInt(le+22);
			QC_strlcpy(name, cd+46, (nl+1<sizeof(name))?nl+1:sizeof(name));

			cb(name, le+30+QC_ReadRawShort(le+26)+QC_ReadRawShort(le+28), csize, method, usize);
		}
	}
	return true;
}

char *PDECL filefromprogs(pubprogfuncs_t *ppf, progsnum_t prnum, char *fname, size_t *size, char *buffer)
{
	progfuncs_t *progfuncs = (progfuncs_t*)ppf;
	int num;
	includeddatafile_t *s;
	if (size)
		*size = 0;
	if (!pr_progstate[prnum].progs)
		return NULL;
	if (pr_progstate[prnum].progs->version != PROG_EXTENDEDVERSION)
		return NULL;
	if (!pr_progstate[prnum].progs->secondaryversion != PROG_SECONDARYVERSION16 &&
		!pr_progstate[prnum].progs->secondaryversion != PROG_SECONDARYVERSION32)
		return NULL;

	num = *(int*)((char *)pr_progstate[prnum].progs + pr_progstate[prnum].progs->ofsfiles);
	s = (includeddatafile_t *)((char *)pr_progstate[prnum].progs + pr_progstate[prnum].progs->ofsfiles+4);	
	while(num>0)
	{
		if (!strcmp(s->filename, fname))
		{
			if (size)
				*size = s->size;
			if (!buffer)
				return NULL;
			return QC_decode(progfuncs, s->compsize, s->size, s->compmethod, (char *)pr_progstate[prnum].progs+s->ofs, buffer);
		}

		s++;
		num--;
	}	

	if (size)
		*size = 0;
	return NULL;
}

/*
char *filefromnewprogs(progfuncs_t *progfuncs, char *prname, char *fname, int *size, char *buffer)
{
	int num;
	includeddatafile_t *s;	
	progstate_t progs;
	if (!PR_ReallyLoadProgs(progfuncs, prname, -1, &progs, false))
	{
		if (size)
			*size = 0;
		return NULL;
	}

	if (progs.progs->version < PROG_EXTENDEDVERSION)
		return NULL;
	if (!progs.progs->ofsfiles)
		return NULL;

	num = *(int*)((char *)progs.progs + progs.progs->ofsfiles);
	s = (includeddatafile_t *)((char *)progs.progs + progs.progs->ofsfiles+4);	
	while(num>0)
	{
		if (!strcmp(s->filename, fname))
		{
			if (size)
				*size = s->size;
			if (!buffer)
				return (char *)0xffffffff;
			return QC_decode(progfuncs, s->compsize, s->size, s->compmethod, (char *)progs.progs+s->ofs, buffer);
		}

		s++;
		num--;
	}	

	if (size)
		*size = 0;
	return NULL;
}
*/