gecko-dev/config/asdecode.cpp
2003-09-29 06:04:02 +00:00

155 lines
4.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the AppleSingle decoder.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Patrick Beard <beard@netscape.com> (Original author)
* Brian Ryner <bryner@brianryner.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <stdlib.h>
#define EXIT_IF_FALSE(x) \
do { \
if (!(x)) { \
printf("Assertion failure: %s\n" \
" at %s line %d\n", \
#x, __FILE__, __LINE__); \
exit(1); \
} \
} while (0)
// decodes a file into data and resource forks.
static int read_int(FILE* f)
{
int result;
EXIT_IF_FALSE(fread(&result, sizeof(result), 1, f) == 1);
return result;
}
static void copy_range(FILE* input, size_t offset, size_t length,
const char* output_name)
{
FILE* output = fopen(output_name, "wb");
EXIT_IF_FALSE(output != NULL);
fseek(input, offset, SEEK_SET);
while (length != 0) {
char buffer[4096];
size_t amount = (length > sizeof(buffer) ? sizeof(buffer) : length);
EXIT_IF_FALSE(fread(buffer, 1, amount, input) == amount);
fwrite(buffer, 1, amount, output);
length -= amount;
}
fclose(output);
}
int main(int argc, char** argv)
{
if (argc < 3) {
printf("usage: %s input output\n", argv[0]);
exit(1);
}
FILE* input = fopen(argv[1], "rb");
if (input == NULL) {
printf("%s: can't open file `%s'\n", argv[0], argv[1]);
exit(2);
}
struct header {
int magic_number;
int version_number;
char filler[16];
} header;
EXIT_IF_FALSE(fread(&header, sizeof(header), 1, input) == 1);
EXIT_IF_FALSE(header.magic_number == 0x00051600);
EXIT_IF_FALSE(header.version_number <= 0x00020000);
// printf("sizeof(header) == %d\n", sizeof(header));
short entry_count;
EXIT_IF_FALSE(fread(&entry_count, sizeof(entry_count), 1, input) == 1);
struct entry {
unsigned int id;
unsigned int offset;
unsigned int length;
};
entry* entries = new entry[entry_count];
EXIT_IF_FALSE(fread(entries, sizeof(entry), entry_count, input) == entry_count);
entry* data_entry = NULL;
entry* rez_entry = NULL;
for (int i = 0; i < entry_count; i++) {
entry& entry = entries[i];
switch (entry.id) {
case 1:
// data fork.
data_entry = &entry;
break;
case 2:
rez_entry = &entry;
break;
}
}
const char* data_name = argv[2];
if (data_entry && data_entry->length) {
copy_range(input, data_entry->offset, data_entry->length, data_name);
} else {
// always create the data fork, even if the file doesn't have one.
FILE* tmp = fopen(data_name, "wb");
EXIT_IF_FALSE(tmp);
fclose(tmp);
}
if (rez_entry && rez_entry->length) {
char rez_name[512];
strcpy(rez_name, data_name);
strcat(rez_name, "/rsrc");
copy_range(input, rez_entry->offset, rez_entry->length, rez_name);
}
delete[] entries;
fclose(input);
return 0;
}