ref: 30670c674ee6ae1f468e1ac29b66e0480a113ede
dir: /Engine/src/filesystem.c/
//
// filesystem.c
// Duke3D
//
// Created by fabien sanglard on 12-12-19.
// Copyright (c) 2012 fabien sanglard. All rights reserved.
//
#include "filesystem.h"
#include "platform.h"
#include "cache.h"
#include "fixedPoint_math.h"
#include "../../Game/src/global.h"
char game_dir[512];
uint8_t toupperlookup[256] =
{
0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
0x60,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x7b,0x7c,0x7d,0x7e,0x7f,
0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,
0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,
0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf,
0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,
0xd0,0xd1,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdd,0xde,0xdf,
0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,
0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff,
};
int32_t numgroupfiles = 0; // number of GRP files actually used.
int32_t gnumfiles[MAXGROUPFILES]; // number of files on grp
int32_t groupfil[MAXGROUPFILES] = {-1,-1,-1,-1}; // grp file handles
int32_t groupfilpos[MAXGROUPFILES];
uint8_t *gfilelist[MAXGROUPFILES]; // name list + size list of all the files in grp
int32_t *gfileoffs[MAXGROUPFILES]; // offset of the files
uint8_t *groupfil_memory[MAXGROUPFILES]; // addresses of raw GRP files in memory
int32_t groupefil_crc32[MAXGROUPFILES];
uint8_t filegrp[MAXOPENFILES];
int32_t filepos[MAXOPENFILES];
int32_t filehan[MAXOPENFILES] =
{
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
};
int32_t initgroupfile(const char *filename)
{
uint8_t buf[16];
int32_t i, j, k;
printf("Loading %s ...\n", filename);
if (numgroupfiles >= MAXGROUPFILES) return(-1);
groupfil_memory[numgroupfiles] = NULL; // addresses of raw GRP files in memory
groupefil_crc32[numgroupfiles] = 0;
groupfil[numgroupfiles] = open(filename,O_BINARY|O_RDWR,S_IREAD);
if (groupfil[numgroupfiles] >= 0)
{
groupfilpos[numgroupfiles] = 0;
read(groupfil[numgroupfiles],buf,16);
if ((buf[0] != 'K') || (buf[1] != 'e') || (buf[2] != 'n') ||
(buf[3] != 'S') || (buf[4] != 'i') || (buf[5] != 'l') ||
(buf[6] != 'v') || (buf[7] != 'e') || (buf[8] != 'r') ||
(buf[9] != 'm') || (buf[10] != 'a') || (buf[11] != 'n'))
{
close(groupfil[numgroupfiles]);
groupfil[numgroupfiles] = -1;
return(-1);
}
//FCS: The ".grp" file format is just a collection of a lot of files stored into 1 big one.
//I tried to make the format as simple as possible: The first 12 bytes contains my name,
//"KenSilverman". The next 4 bytes is the number of files that were compacted into the
//group file. Then for each file, there is a 16 byte structure, where the first 12
//bytes are the filename, and the last 4 bytes are the file's size. The rest of the
//group file is just the raw data packed one after the other in the same order as the list
//of files. - ken
gnumfiles[numgroupfiles] = BUILDSWAP_INTEL32(*((int32_t *)&buf[12]));
if ((gfilelist[numgroupfiles] = (uint8_t *)kmalloc(gnumfiles[numgroupfiles]<<4)) == 0)
{ Error(EXIT_FAILURE, "Not enough memory for file grouping system\n"); }
if ((gfileoffs[numgroupfiles] = (int32_t *)kmalloc((gnumfiles[numgroupfiles]+1)<<2)) == 0)
{ Error(EXIT_FAILURE, "Not enough memory for file grouping system\n"); }
// load index (name+size)
read(groupfil[numgroupfiles],gfilelist[numgroupfiles],gnumfiles[numgroupfiles]<<4);
j = 0;
for(i=0;i<gnumfiles[numgroupfiles];i++)
{
k = BUILDSWAP_INTEL32(*((int32_t *)&gfilelist[numgroupfiles][(i<<4)+12])); // get size
gfilelist[numgroupfiles][(i<<4)+12] = 0;
gfileoffs[numgroupfiles][i] = j; // absolute offset list of all files. 0 for 1st file
j += k;
}
gfileoffs[numgroupfiles][gnumfiles[numgroupfiles]] = j;
}
else
{
printf("Unable to find GRP file %s.\n",filename);
//Let user see the message
getchar();
exit(0);
}
// Compute CRC32 of thw whole grp and implicitely caches the GRP in memory through windows
lseek(groupfil[numgroupfiles], 0, SEEK_SET);
i = 1000000; // FIX_00086: grp loaded by smaller sucessive chunks to avoid overloading low ram computers
groupfil_memory[numgroupfiles] = malloc(i);
while((j=read(groupfil[numgroupfiles], groupfil_memory[numgroupfiles], i)))
{
groupefil_crc32[numgroupfiles] = crc32_update((uint8_t *)groupfil_memory[numgroupfiles], j, groupefil_crc32[numgroupfiles]);
}
free(groupfil_memory[numgroupfiles]);
groupfil_memory[numgroupfiles] = 0;
numgroupfiles++;
return(groupfil[numgroupfiles-1]);
}
void uninitgroupfile(void)
{
int32_t i;
for(i=numgroupfiles-1;i>=0;i--)
if (groupfil[i] != -1)
{
kfree(gfilelist[i]);
kfree(gfileoffs[i]);
close(groupfil[i]);
groupfil[i] = -1;
}
}
void crc32_table_gen(unsigned int* crc32_table) /* build CRC32 table */
{
unsigned int crc, poly;
int i, j;
poly = 0xEDB88320L;
for (i = 0; i < 256; i++)
{
crc = i;
for (j = 8; j > 0; j--)
{
if (crc & 1)
crc = (crc >> 1) ^ poly;
else
crc >>= 1;
}
crc32_table[i] = crc;
}
}
unsigned int crc32(uint8_t *buf, unsigned int length)
{
unsigned int initial_crc;
initial_crc = 0;
return(crc32_update(buf, length, initial_crc));
}
unsigned int crc32_update(uint8_t *buf, unsigned int length, unsigned int crc_to_update)
{
unsigned int crc32_table[256];
crc32_table_gen(crc32_table);
crc_to_update ^= 0xFFFFFFFF;
while (length--)
crc_to_update = crc32_table[(crc_to_update ^ *buf++) & 0xFF] ^ (crc_to_update >> 8);
return crc_to_update ^ 0xFFFFFFFF;
}
/*
* 16 12 5
* this is the CCITT CRC 16 polynomial X + X + X + 1.
* This is 0x1021 when x is 2, but the way the algorithm works
* we use 0x8408 (the reverse of the bit pattern). The high
* bit is always assumed to be set, thus we only use 16 bits to
* represent the 17 bit value.
*/
#define POLY 0x8408 /* 1021H bit reversed */
uint16_t crc16(uint8_t *data_p, uint16_t length)
{
uint8_t i;
unsigned int data;
unsigned int crc = 0xffff;
if (length == 0)
return (~crc);
do
{
for (i=0, data=(unsigned int)0xff & *data_p++;
i < 8;
i++, data >>= 1)
{
if ((crc & 0x0001) ^ (data & 0x0001))
crc = (crc >> 1) ^ POLY;
else crc >>= 1;
}
} while (--length);
crc = ~crc;
data = crc;
crc = (crc << 8) | (data >> 8 & 0xff);
return (crc);
}
int32_t kopen4load(const char *filename, int readfromGRP)
{ // FIX_00072: all files are now 1st searched in Duke's root folder and then in the GRP.
int32_t i, j, k, fil, newhandle;
uint8_t bad;
uint8_t *gfileptr;
newhandle = MAXOPENFILES-1;
while (filehan[newhandle] != -1)
{
newhandle--;
if (newhandle < 0)
{
Error(EXIT_FAILURE, "Too Many files open!\n");
}
}
if(!readfromGRP)
if ((fil = open(filename,O_BINARY|O_RDONLY)) != -1)
{
filegrp[newhandle] = 255;
filehan[newhandle] = fil;
filepos[newhandle] = 0;
printf("Reading external %s \n", filename);
return(newhandle);
}
for(k=numgroupfiles-1;k>=0;k--)
{
if (groupfil[k] != -1)
{
for(i=gnumfiles[k]-1;i>=0;i--)
{
gfileptr = (uint8_t *)&gfilelist[k][i<<4];
bad = 0;
for(j=0;j<13;j++)
{
if (!filename[j]) break;
if (toupperlookup[(int) filename[j]] != toupperlookup[(int) gfileptr[j]])
{ bad = 1; break; }
}
if (bad) continue;
filegrp[newhandle] = (uint8_t ) k;
filehan[newhandle] = i;
filepos[newhandle] = 0;
return(newhandle);
}
}
}
return(-1);
}
int32_t kread(int32_t handle, void *buffer, int32_t leng)
{
int32_t i, filenum, groupnum;
filenum = filehan[handle];
groupnum = filegrp[handle];
if (groupnum == 255) // Reading external
{
return(read(filenum,buffer,leng));
}
if (groupfil[groupnum] != -1)
{
i = gfileoffs[groupnum][filenum]+filepos[handle];
if (i != groupfilpos[groupnum])
{
lseek(groupfil[groupnum],i+((gnumfiles[groupnum]+1)<<4),SEEK_SET);
groupfilpos[groupnum] = i;
}
leng = min(leng,(gfileoffs[groupnum][filenum+1]-gfileoffs[groupnum][filenum])-filepos[handle]);
leng = read(groupfil[groupnum],buffer,leng);
filepos[handle] += leng;
groupfilpos[groupnum] += leng;
return(leng);
}
return(0);
}
int kread16(int32_t handle, short *buffer)
{
if (kread(handle, buffer, 2) != 2)
return(0);
*buffer = BUILDSWAP_INTEL16(*buffer);
return(1);
}
int kread32(int32_t handle, int32_t *buffer)
{
if (kread(handle, buffer, 4) != 4)
return(0);
*buffer = BUILDSWAP_INTEL32(*buffer);
return(1);
}
int kread8(int32_t handle, uint8_t *buffer)
{
if (kread(handle, buffer, 1) != 1)
return(0);
return(1);
}
int32_t klseek(int32_t handle, int32_t offset, int32_t whence)
{
int32_t i, groupnum;
groupnum = filegrp[handle];
if (groupnum == 255) return((int32_t )lseek(filehan[handle],offset,whence));
if (groupfil[groupnum] != -1)
{
switch(whence)
{
case SEEK_SET: filepos[handle] = offset; break;
case SEEK_END: i = filehan[handle];
filepos[handle] = (gfileoffs[groupnum][i+1]-gfileoffs[groupnum][i])+offset;
break;
case SEEK_CUR: filepos[handle] += offset; break;
}
return(filepos[handle]);
}
return(-1);
}
#ifdef __APPLE__
int32_t filelength(int32_t fd)
{
struct stat stats;
fstat(fd, &stats);
return (int32_t )stats.st_size;
}
#endif
int32_t kfilelength(int32_t handle)
{
int32_t i, groupnum;
groupnum = filegrp[handle];
if (groupnum == 255) return(filelength(filehan[handle]));
i = filehan[handle];
return(gfileoffs[groupnum][i+1]-gfileoffs[groupnum][i]);
}
void kclose(int32_t handle)
{
if (handle < 0) return;
if (filegrp[handle] == 255) close(filehan[handle]);
filehan[handle] = -1;
}
/* Internal LZW variables */
#define LZWSIZE 16384 /* Watch out for shorts! */
static uint8_t *lzwbuf1, *lzwbuf4, *lzwbuf5;
static uint8_t lzwbuflock[5];
static short *lzwbuf2, *lzwbuf3;
void kdfread(void *buffer, size_t dasizeof, size_t count, int32_t fil)
{
size_t i, j;
int32_t k, kgoal;
short leng;
uint8_t *ptr;
lzwbuflock[0] = lzwbuflock[1] = lzwbuflock[2] = lzwbuflock[3] = lzwbuflock[4] = 200;
if (lzwbuf1 == NULL) allocache(&lzwbuf1,LZWSIZE+(LZWSIZE>>4),&lzwbuflock[0]);
if (lzwbuf2 == NULL) allocache(&lzwbuf2,(LZWSIZE+(LZWSIZE>>4))*2,&lzwbuflock[1]);
if (lzwbuf3 == NULL) allocache(&lzwbuf3,(LZWSIZE+(LZWSIZE>>4))*2,&lzwbuflock[2]);
if (lzwbuf4 == NULL) allocache(&lzwbuf4,LZWSIZE,&lzwbuflock[3]);
if (lzwbuf5 == NULL) allocache(&lzwbuf5,LZWSIZE+(LZWSIZE>>4),&lzwbuflock[4]);
if (dasizeof > LZWSIZE) { count *= dasizeof; dasizeof = 1; }
ptr = (uint8_t *)buffer;
kread(fil,&leng,2); kread(fil,lzwbuf5,(int32_t )leng);
k = 0;
kgoal = uncompress(lzwbuf5,leng,lzwbuf4);
copybufbyte(lzwbuf4,ptr,(int32_t )dasizeof);
k += (int32_t )dasizeof;
for(i=1;i<count;i++)
{
if (k >= kgoal)
{
kread(fil,&leng,2); kread(fil,lzwbuf5,(int32_t )leng);
k = 0; kgoal = uncompress(lzwbuf5,(int32_t )leng,lzwbuf4);
}
for(j=0;j<dasizeof;j++) ptr[j+dasizeof] = (uint8_t ) ((ptr[j]+lzwbuf4[j+k])&255);
k += dasizeof;
ptr += dasizeof;
}
lzwbuflock[0] = lzwbuflock[1] = lzwbuflock[2] = lzwbuflock[3] = lzwbuflock[4] = 1;
}
void dfread(void *buffer, size_t dasizeof, size_t count, FILE *fil)
{
size_t i, j;
int32_t k, kgoal;
short leng;
uint8_t *ptr;
lzwbuflock[0] = lzwbuflock[1] = lzwbuflock[2] = lzwbuflock[3] = lzwbuflock[4] = 200;
if (lzwbuf1 == NULL) allocache((int32_t *)&lzwbuf1,LZWSIZE+(LZWSIZE>>4),&lzwbuflock[0]);
if (lzwbuf2 == NULL) allocache((int32_t *)&lzwbuf2,(LZWSIZE+(LZWSIZE>>4))*2,&lzwbuflock[1]);
if (lzwbuf3 == NULL) allocache((int32_t *)&lzwbuf3,(LZWSIZE+(LZWSIZE>>4))*2,&lzwbuflock[2]);
if (lzwbuf4 == NULL) allocache((int32_t *)&lzwbuf4,LZWSIZE,&lzwbuflock[3]);
if (lzwbuf5 == NULL) allocache((int32_t *)&lzwbuf5,LZWSIZE+(LZWSIZE>>4),&lzwbuflock[4]);
if (dasizeof > LZWSIZE) {
count *= dasizeof;
dasizeof = 1;
}
ptr = (uint8_t *)buffer;
fread(&leng,2,1,fil);
fread(lzwbuf5,(int32_t )leng,1,fil);
k = 0;
kgoal = uncompress(lzwbuf5,(int32_t )leng,lzwbuf4);
copybufbyte(lzwbuf4,ptr,(int32_t )dasizeof);
k += (int32_t )dasizeof;
for(i=1;i<count;i++)
{
if (k >= kgoal)
{
fread(&leng,2,1,fil); fread(lzwbuf5,(int32_t )leng,1,fil);
k = 0; kgoal = uncompress(lzwbuf5,(int32_t )leng,lzwbuf4);
}
for(j=0;j<dasizeof;j++) ptr[j+dasizeof] = (uint8_t ) ((ptr[j]+lzwbuf4[j+k])&255);
k += dasizeof;
ptr += dasizeof;
}
lzwbuflock[0] = lzwbuflock[1] = lzwbuflock[2] = lzwbuflock[3] = lzwbuflock[4] = 1;
}
void dfwrite(void *buffer, size_t dasizeof, size_t count, FILE *fil)
{
size_t i, j, k;
short leng;
uint8_t *ptr;
lzwbuflock[0] = lzwbuflock[1] = lzwbuflock[2] = lzwbuflock[3] = lzwbuflock[4] = 200;
if (lzwbuf1 == NULL) allocache(&lzwbuf1,LZWSIZE+(LZWSIZE>>4),&lzwbuflock[0]);
if (lzwbuf2 == NULL) allocache(&lzwbuf2,(LZWSIZE+(LZWSIZE>>4))*2,&lzwbuflock[1]);
if (lzwbuf3 == NULL) allocache(&lzwbuf3,(LZWSIZE+(LZWSIZE>>4))*2,&lzwbuflock[2]);
if (lzwbuf4 == NULL) allocache(&lzwbuf4,LZWSIZE,&lzwbuflock[3]);
if (lzwbuf5 == NULL) allocache(&lzwbuf5,LZWSIZE+(LZWSIZE>>4),&lzwbuflock[4]);
if (dasizeof > LZWSIZE) { count *= dasizeof; dasizeof = 1; }
ptr = (uint8_t *)buffer;
copybufbyte(ptr,lzwbuf4,(int32_t )dasizeof);
k = dasizeof;
if (k > LZWSIZE-dasizeof)
{
leng = (short)compress(lzwbuf4,k,lzwbuf5); k = 0;
fwrite(&leng,2,1,fil); fwrite(lzwbuf5,(int32_t )leng,1,fil);
}
for(i=1;i<count;i++)
{
for(j=0;j<dasizeof;j++) lzwbuf4[j+k] = (uint8_t ) ((ptr[j+dasizeof]-ptr[j])&255);
k += dasizeof;
if (k > LZWSIZE-dasizeof)
{
leng = (short)compress(lzwbuf4,k,lzwbuf5); k = 0;
fwrite(&leng,2,1,fil); fwrite(lzwbuf5,(int32_t )leng,1,fil);
}
ptr += dasizeof;
}
if (k > 0)
{
leng = (short)compress(lzwbuf4,k,lzwbuf5);
fwrite(&leng,2,1,fil); fwrite(lzwbuf5,(int32_t )leng,1,fil);
}
lzwbuflock[0] = lzwbuflock[1] = lzwbuflock[2] = lzwbuflock[3] = lzwbuflock[4] = 1;
}
int32_t compress(uint8_t *lzwinbuf, int32_t uncompleng, uint8_t *lzwoutbuf)
{
int32_t i, addr, newaddr, addrcnt, zx, *longptr;
int32_t bytecnt1, bitcnt, numbits, oneupnumbits;
short *shortptr;
for(i=255;i>=0;i--) { lzwbuf1[i] = (uint8_t ) i; lzwbuf3[i] = (short) ((i+1)&255); }
clearbuf((void *) FP_OFF(lzwbuf2),256>>1,0xffffffff);
clearbuf((void *) FP_OFF(lzwoutbuf),((uncompleng+15)+3)>>2,0L);
addrcnt = 256; bytecnt1 = 0; bitcnt = (4<<3);
numbits = 8; oneupnumbits = (1<<8);
do
{
addr = lzwinbuf[bytecnt1];
do
{
bytecnt1++;
if (bytecnt1 == uncompleng) break;
if (lzwbuf2[addr] < 0) {lzwbuf2[addr] = (short) addrcnt; break;}
newaddr = lzwbuf2[addr];
while (lzwbuf1[newaddr] != lzwinbuf[bytecnt1])
{
zx = lzwbuf3[newaddr];
if (zx < 0) {lzwbuf3[newaddr] = (short) addrcnt; break;}
newaddr = zx;
}
if (lzwbuf3[newaddr] == addrcnt) break;
addr = newaddr;
} while (addr >= 0);
lzwbuf1[addrcnt] = lzwinbuf[bytecnt1];
lzwbuf2[addrcnt] = -1;
lzwbuf3[addrcnt] = -1;
longptr = (int32_t *)&lzwoutbuf[bitcnt>>3];
longptr[0] |= (addr<<(bitcnt&7));
bitcnt += numbits;
if ((addr&((oneupnumbits>>1)-1)) > ((addrcnt-1)&((oneupnumbits>>1)-1)))
bitcnt--;
addrcnt++;
if (addrcnt > oneupnumbits) { numbits++; oneupnumbits <<= 1; }
} while ((bytecnt1 < uncompleng) && (bitcnt < (uncompleng<<3)));
longptr = (int32_t *)&lzwoutbuf[bitcnt>>3];
longptr[0] |= (addr<<(bitcnt&7));
bitcnt += numbits;
if ((addr&((oneupnumbits>>1)-1)) > ((addrcnt-1)&((oneupnumbits>>1)-1)))
bitcnt--;
shortptr = (short *)lzwoutbuf;
shortptr[0] = (short)uncompleng;
if (((bitcnt+7)>>3) < uncompleng)
{
shortptr[1] = (short)addrcnt;
return((bitcnt+7)>>3);
}
shortptr[1] = (short)0;
for(i=0;i<uncompleng;i++) lzwoutbuf[i+4] = lzwinbuf[i];
return(uncompleng+4);
}
int32_t uncompress(uint8_t *lzwinbuf, int32_t compleng, uint8_t *lzwoutbuf)
{
int32_t strtot, currstr, numbits, oneupnumbits;
int32_t i, dat, leng, bitcnt, outbytecnt, *longptr;
short *shortptr;
shortptr = (short *)lzwinbuf;
strtot = (int32_t )shortptr[1];
if (strtot == 0)
{
copybuf((void *)(FP_OFF(lzwinbuf)+4),(void *)(FP_OFF(lzwoutbuf)),((compleng-4)+3)>>2);
return((int32_t )shortptr[0]); /* uncompleng */
}
for(i=255;i>=0;i--) { lzwbuf2[i] = (short) i; lzwbuf3[i] = (short) i; }
currstr = 256; bitcnt = (4<<3); outbytecnt = 0;
numbits = 8; oneupnumbits = (1<<8);
do
{
longptr = (int32_t *)&lzwinbuf[bitcnt>>3];
dat = ((longptr[0]>>(bitcnt&7)) & (oneupnumbits-1));
bitcnt += numbits;
if ((dat&((oneupnumbits>>1)-1)) > ((currstr-1)&((oneupnumbits>>1)-1)))
{ dat &= ((oneupnumbits>>1)-1); bitcnt--; }
lzwbuf3[currstr] = (short) dat;
for(leng=0;dat>=256;leng++,dat=lzwbuf3[dat])
lzwbuf1[leng] = (uint8_t ) lzwbuf2[dat];
lzwoutbuf[outbytecnt++] = (uint8_t ) dat;
for(i=leng-1;i>=0;i--) lzwoutbuf[outbytecnt++] = lzwbuf1[i];
lzwbuf2[currstr-1] = (short) dat; lzwbuf2[currstr] = (short) dat;
currstr++;
if (currstr > oneupnumbits) { numbits++; oneupnumbits <<= 1; }
} while (currstr < strtot);
return((int32_t )shortptr[0]); /* uncompleng */
}
int SafeFileExists ( const char * _filename );
int32_t TCkopen4load(const char *filename, int readfromGRP)
{
char fullfilename[512];
int32_t result = 0;
if(game_dir[0] != '\0' && !readfromGRP)
{
sprintf(fullfilename, "%s\\%s", game_dir, filename);
if (!SafeFileExists(fullfilename)) // try root
sprintf(fullfilename, "%s", filename);
}
else
{
sprintf(fullfilename, "%s", filename);
}
result = kopen4load(fullfilename, readfromGRP);
return result;
}
void setGameDir(char* gameDir){
if (gameDir == NULL)
return;
strncpy(game_dir,gameDir,sizeof(game_dir));
}
char* getGameDir(void){
return game_dir;
}