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/* utility to extract the .SHR installer data files of early ID software
shareware games
Copyright (C) 2007 Hans de Goede <j.w.r.degoede@hhs.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <libdynamite.h>
struct cookie_s {
char *in_buffer;
int in_buffer_remaining;
int in_buffer_index;
int in_buffer_size;
FILE* out_file;
};
size_t reader(void* buffer, size_t size, void* cookie)
{
struct cookie_s *c = cookie;
if (size > c->in_buffer_remaining)
size = c->in_buffer_remaining;
memcpy (buffer, c->in_buffer + c->in_buffer_index, size);
c->in_buffer_index += size;
c->in_buffer_remaining -= size;
return size;
}
size_t writer(void* buffer, size_t size, void* cookie)
{
struct cookie_s *c = cookie;
return fwrite(buffer, 1, size, c->out_file);
}
int main(int argc, char *argv[])
{
struct cookie_s cookie;
FILE *in_file;
char filename[16];
unsigned char buf[4];
int i, compressed_size;
if (argc != 2) {
fprintf(stderr, "%s: Usage: %s <filename.CHR> %d\n", argv[0], argv[0], argc);
return 1;
}
in_file = fopen(argv[1], "r");
if (!in_file) {
fprintf(stderr, "error opening: %s", argv[1]);
perror(NULL);
return 1;
}
/* skip first 0x3A bytes header */
if (fseek(in_file, 0x3A, SEEK_CUR)) {
perror("error skipping initial file header");
return 1;
}
cookie.in_buffer = malloc(65536);
if (!cookie.in_buffer) {
fprintf(stderr, "Error: out of memory\n");
return 1;
}
cookie.in_buffer_size = 65536;
while (1)
{
/* get the name of the file */
if (fread(filename, 1, sizeof(filename), in_file) != sizeof(filename)) {
if (feof(in_file)) {
free(cookie.in_buffer);
fclose(in_file);
return 0; /* done */
}
perror("error getting output filename from file");
return 1;
}
/* verify the filename and convert to lower case */
for (i = 0 ; i < sizeof(filename); i++) {
if (filename[i] == 0)
break; /* done */
if (!isprint(filename[i])) {
fprintf(stderr, "error invalid output filename\n");
return 1;
}
filename[i] = tolower(filename[i]);
}
if (i == sizeof(filename)) {
fprintf(stderr, "error too long output filename\n");
return 1;
}
/* seek to compressed size */
if (fseek(in_file, 0x88 - sizeof(filename), SEEK_CUR)) {
perror("error skipping file header before file size");
return 1;
}
if (fread(buf, 1, 4, in_file) != 4) {
perror("error reading file size");
return 1;
}
compressed_size = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
if (compressed_size > cookie.in_buffer_size) {
cookie.in_buffer = realloc(cookie.in_buffer, compressed_size);
if (!cookie.in_buffer) {
fprintf(stderr, "Error: out of memory\n");
return 1;
}
cookie.in_buffer_size = compressed_size;
}
/* seek to begin of compressed data */
if (fseek(in_file, 0x1C, SEEK_CUR)) {
perror("error skipping file header before file size");
return 1;
}
/* read compressed data */
if (fread(cookie.in_buffer, 1, compressed_size, in_file) !=
compressed_size) {
perror("error reading compressed data");
return 1;
}
cookie.in_buffer_index = 0;
cookie.in_buffer_remaining = compressed_size;
cookie.out_file = fopen(filename, "w");
if (!cookie.out_file) {
fprintf(stderr, "Error creating: %s for writing", filename);
perror(NULL);
return 1;
}
printf("decompressing: %s, compressed size: %d\n", filename,
compressed_size);
if ((i = dynamite_explode(reader, writer, &cookie))) {
fprintf(stderr, "Error: %d while decompressing\n", i);
return i;
}
fclose(cookie.out_file);
}
/* never reached */
return 0;
}
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