mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-12-21 10:20:42 +00:00
311 lines
7.1 KiB
C
311 lines
7.1 KiB
C
/*
|
|
* Wad compressor/decompressor by Graue <graue@oceanbase.org>
|
|
* Written January 23, 2007
|
|
*
|
|
* This file is in the public domain; use it without any restrictions.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#ifndef _MSC_VER
|
|
#include <stdint.h>
|
|
#else
|
|
typedef unsigned int uint32_t;
|
|
typedef unsigned char uint8_t;
|
|
typedef unsigned short uint16_t;
|
|
#endif
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include "err.h"
|
|
#include "lzf.h"
|
|
#include "xm.h"
|
|
|
|
/* Note: Define WORDS_BIGENDIAN if that is the case on the target CPU. */
|
|
|
|
#define MINCOMPRESS 1024 // Don't bother compressing lumps smaller than this.
|
|
|
|
#define SWAP16(n) ((((n)&0xff)<<8) | ((n)>>8))
|
|
#define SWAP32(n) \
|
|
( \
|
|
((((n)&0xff) <<24) \
|
|
| ((((n)>>8)&0xff)<<16) \
|
|
| ((((n)>>16)&0xff)<<8) \
|
|
| ((n)>>24) \
|
|
)
|
|
#ifdef WORDS_BIGENDIAN
|
|
#define conv16le SWAP16
|
|
#define conv32le SWAP32
|
|
#else
|
|
#define conv16le(n) (n)
|
|
#define conv32le(n) (n)
|
|
#endif
|
|
#define READFUNC(name, type, conv) \
|
|
static type name(FILE *fp) \
|
|
{ \
|
|
type val; \
|
|
if (fread(&val, sizeof val, 1, fp) < 1) \
|
|
{ \
|
|
if (ferror(fp)) \
|
|
err(1, "error reading input file"); \
|
|
errx(1, "premature end of input file"); \
|
|
} \
|
|
val = conv(val); \
|
|
return val; \
|
|
}
|
|
READFUNC(read32le, uint32_t, conv32le)
|
|
|
|
#define WRITEFUNC(name, type, conv) \
|
|
static void name(FILE *fp, type val) \
|
|
{ \
|
|
val = conv(val); \
|
|
if (fwrite(&val, sizeof (type), 1, fp) < 1) \
|
|
err(1, "error writing output file"); \
|
|
}
|
|
WRITEFUNC(write32le, uint32_t, conv32le)
|
|
|
|
#define ID_IWAD 0x44415749
|
|
#define ID_PWAD 0x44415750
|
|
#define ID_ZWAD 0x4441575a // 'ZWAD' for lzf-compressed wad
|
|
|
|
typedef struct
|
|
{
|
|
char name[8];
|
|
uint32_t len;
|
|
void *data;
|
|
} lump_t;
|
|
|
|
typedef struct
|
|
{
|
|
uint32_t id;
|
|
uint32_t numlumps;
|
|
lump_t *lumps;
|
|
} wad_t;
|
|
|
|
extern char *__progname;
|
|
|
|
static void usage(void)
|
|
{
|
|
fprintf(stderr, "usage: %s [cd] infile outfile\n", __progname);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
#define fileoffset_t long
|
|
#define myseek fseek
|
|
#define mytell ftell
|
|
|
|
static void readlumpdata(lump_t *lump, uint32_t csize, int compressed, FILE *fp)
|
|
{
|
|
uint8_t *cbuf;
|
|
uint8_t *ubuf;
|
|
uint32_t usize;
|
|
unsigned int retval;
|
|
|
|
cbuf = xm(1, csize);
|
|
if (fread(cbuf, csize, 1, fp) < 1)
|
|
err(1, "cannot read lump from input file");
|
|
|
|
if (!compressed)
|
|
{
|
|
lump->len = csize;
|
|
lump->data = cbuf;
|
|
return;
|
|
}
|
|
|
|
usize = conv32le(*(uint32_t *)cbuf);
|
|
if (usize == 0)
|
|
{
|
|
lump->len = csize - 4;
|
|
lump->data = cbuf + 4; // XXX cannot be freed later
|
|
return;
|
|
}
|
|
|
|
ubuf = xm(1, usize);
|
|
retval = lzf_decompress(cbuf + 4, csize - 4, ubuf, usize);
|
|
if (retval == 0)
|
|
{
|
|
if (errno == E2BIG)
|
|
errx(1, "decompressed data bigger than advertised");
|
|
if (errno == EINVAL)
|
|
errx(1, "invalid compressed (lzf) data");
|
|
else
|
|
err(1, "unknown error from lzf");
|
|
}
|
|
else if (retval < usize)
|
|
errx(1, "decompressed data smaller than advertised");
|
|
lump->len = usize;
|
|
lump->data = ubuf;
|
|
free(cbuf);
|
|
return;
|
|
}
|
|
|
|
static wad_t *readwad(const char *fname)
|
|
{
|
|
wad_t *wad;
|
|
FILE *fp;
|
|
int inputcompressed;
|
|
fileoffset_t dirstart;
|
|
uint32_t ix;
|
|
|
|
fp = fopen(fname, "rb");
|
|
if (fp == NULL) err(1, "%s", fname);
|
|
|
|
wad = xm(sizeof *wad, 1);
|
|
|
|
// Read wad id. If it is ZWAD, prepare to read compressed lumps.
|
|
wad->id = read32le(fp);
|
|
inputcompressed = wad->id == ID_ZWAD;
|
|
|
|
// Read number of lumps, and prepare space for that many.
|
|
wad->numlumps = read32le(fp);
|
|
wad->lumps = xm(sizeof wad->lumps[0], wad->numlumps);
|
|
|
|
// Read offset to directory.
|
|
dirstart = (fileoffset_t)read32le(fp);
|
|
|
|
for (ix = 0; ix < wad->numlumps; ix++)
|
|
{
|
|
fileoffset_t lumpofs;
|
|
uint32_t lumpsize; // The compressed size, if it is compressed.
|
|
|
|
if (myseek(fp, dirstart + (16*ix), SEEK_SET) == -1)
|
|
{
|
|
err(1, "cannot seek input file to dir entry %lu",
|
|
(unsigned long)ix);
|
|
}
|
|
lumpofs = (fileoffset_t)read32le(fp);
|
|
lumpsize = read32le(fp);
|
|
if (fread(wad->lumps[ix].name, 1, 8, fp) < 8)
|
|
err(1, "cannot read lump %lu name", (unsigned long)ix);
|
|
|
|
// Don't try to seek to zero-length lumps.
|
|
// Their offset is meaningless.
|
|
if (lumpsize == 0)
|
|
{
|
|
wad->lumps[ix].len = 0;
|
|
continue;
|
|
}
|
|
|
|
if (myseek(fp, lumpofs, SEEK_SET) == -1)
|
|
err(1, "cannot seek to lump %lu", (unsigned long)ix);
|
|
readlumpdata(&wad->lumps[ix], lumpsize, inputcompressed, fp);
|
|
}
|
|
|
|
if (fclose(fp) == EOF)
|
|
warn("error closing input file %s", fname);
|
|
return wad;
|
|
}
|
|
|
|
void writewad(const wad_t *wad, const char *fname, int compress)
|
|
{
|
|
uint32_t *lumpofs; // Each lump's offset in the file.
|
|
uint32_t *disksize; // Each lump's disk size (compressed if applicable).
|
|
uint32_t dirstart;
|
|
uint32_t ix;
|
|
FILE *fp;
|
|
|
|
lumpofs = xm(sizeof lumpofs[0], wad->numlumps);
|
|
disksize = xm(sizeof disksize[0], wad->numlumps);
|
|
|
|
fp = fopen(fname, "wb");
|
|
if (fp == NULL) err(1, "%s", fname);
|
|
|
|
// Write header.
|
|
write32le(fp, compress ? ID_ZWAD : ID_PWAD);
|
|
write32le(fp, wad->numlumps);
|
|
write32le(fp, 0); // Directory table comes later.
|
|
|
|
for (ix = 0; ix < wad->numlumps; ix++)
|
|
{
|
|
uint8_t *cbuf;
|
|
uint32_t csize;
|
|
|
|
lumpofs[ix] = (uint32_t)mytell(fp);
|
|
if (!compress)
|
|
{
|
|
cbuf = wad->lumps[ix].data;
|
|
csize = wad->lumps[ix].len;
|
|
}
|
|
else
|
|
{
|
|
unsigned int retval;
|
|
|
|
csize = wad->lumps[ix].len + 4;
|
|
cbuf = xm(1, csize);
|
|
if (wad->lumps[ix].len < MINCOMPRESS
|
|
|| (retval = lzf_compress(wad->lumps[ix].data,
|
|
wad->lumps[ix].len, cbuf + 4,
|
|
csize - 5)) == 0)
|
|
{
|
|
// Store uncompressed.
|
|
memcpy(cbuf + 4, wad->lumps[ix].data,
|
|
wad->lumps[ix].len);
|
|
*(uint32_t *)cbuf = 0;
|
|
}
|
|
else
|
|
{
|
|
// Compression succeeded.
|
|
// Store uncompressed size, and set compressed
|
|
// size properly.
|
|
*(uint32_t *)cbuf =
|
|
conv32le(wad->lumps[ix].len);
|
|
csize = retval + 4;
|
|
}
|
|
}
|
|
|
|
if (!csize)
|
|
; // inu: 0 length markers aren't to be written
|
|
else if (fwrite(cbuf, csize, 1, fp) < 1)
|
|
{
|
|
err(1, "cannot write lump %lu to %s", (unsigned long)ix,
|
|
fname);
|
|
}
|
|
|
|
if (compress)
|
|
free(cbuf);
|
|
disksize[ix] = csize;
|
|
}
|
|
|
|
dirstart = (uint32_t)mytell(fp);
|
|
if (myseek(fp, 8L, SEEK_SET) == -1)
|
|
err(1, "cannot reseek %s to write directory start", fname);
|
|
write32le(fp, dirstart);
|
|
if (myseek(fp, dirstart, SEEK_SET) == -1)
|
|
err(1, "cannot reseek %s to write actual directory", fname);
|
|
|
|
for (ix = 0; ix < wad->numlumps; ix++)
|
|
{
|
|
// Write the lump's directory entry.
|
|
write32le(fp, lumpofs[ix]);
|
|
write32le(fp, disksize[ix]);
|
|
if (fwrite(wad->lumps[ix].name, 1, 8, fp) < 8)
|
|
{
|
|
err(1, "cannot write lump %lu's name",
|
|
(unsigned long)ix);
|
|
}
|
|
}
|
|
|
|
if (fclose(fp) == EOF)
|
|
warn("error closing output file %s", fname);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
const char *infile, *outfile;
|
|
wad_t *wad;
|
|
int compress;
|
|
|
|
if (argc != 4 || strlen(argv[1]) != 1)
|
|
usage();
|
|
|
|
/* c to compress, d to decompress */
|
|
if (argv[1][0] == 'c') compress = 1;
|
|
else if (argv[1][0] == 'd') compress = 0;
|
|
else usage();
|
|
|
|
infile = argv[2];
|
|
outfile = argv[3];
|
|
|
|
wad = readwad(infile);
|
|
writewad(wad, outfile, compress);
|
|
return 0;
|
|
}
|