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/*
* Sesse's demolib
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef __linux__
#include <unistd.h>
#else
#include <io.h>
#define strncasecmp strnicmp
#endif
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <endian.h>
#include "demolib_prefs.h"
#include "file.h"
#include "pakfile.h"
#include "../exception.h"
#if DEMOLIB_DATA_PAKFILE
#if __BYTE_ORDER != __LITTLE_ENDIAN
#define fixendianl(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#else
#define fixendianl(x) (x)
#endif
PakFile::PakFile(char *filename)
{
char buf[12];
int err, dirpos, dirsize;
unsigned int i;
#if __linux__
int fd = open("/usr/share/amoeba/demo.dat", O_RDONLY);
#else
int fd = open("demo.dat", O_RDONLY | O_BINARY);
#endif
if (fd == -1) throw new FileNotFoundException("demo.dat wasn't found");
/* first verify that this is indeed a pakfile */
err = read(fd, buf, 12);
if (err != 12 || strncasecmp(buf, "PACK", 4) != 0) {
throw new FatalException("demo.dat is not a valid pakfile");
}
/* seek to the beginning of the directory */
dirpos = fixendianl(*(int *)(buf + 4));
if (lseek(fd, dirpos, SEEK_SET) != dirpos) {
throw new FatalException("demo.dat is truncated");
}
dirsize = fixendianl(*(int *)(buf + 8));
for (i = 0; i < dirsize / sizeof(struct pak_direntry); i++) {
char *ptr;
struct pak_direntry d;
if (read(fd, (char *)(&d), sizeof(d)) != sizeof(d)) {
throw new FatalException("demo.dat is truncated");
}
d.pos = fixendianl(d.pos);
d.size = fixendianl(d.size);
d.filename[55] = 0;
if (strcmp(filename, d.filename) != 0) continue;
ptr = (char *)(malloc(d.size));
if (ptr == NULL) {
throw new FatalException("Out of memory!");
}
if (lseek(fd, d.pos, SEEK_SET) == -1) {
throw new FatalException("pakfile truncated!");
}
unsigned int i = 0;
while (i < d.size) {
int num_bytes = d.size - i;
int err;
if (num_bytes > 4096) num_bytes = 4096;
err = read(fd, ptr + i, num_bytes);
if (err <= 0)
throw new FatalException("Error on read()", strerror(errno));
i += err;
}
this->data = ptr;
this->length = d.size;
close(fd);
return;
}
throw new FileNotFoundException("file not found in demo.dat");
}
PakFile::~PakFile()
{
free(this->data);
}
char *PakFile::get_data()
{
return this->data;
}
int PakFile::data_length()
{
return this->length;
}
#endif /* DEMOLIB_DATA_PAKFILE */
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