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/*
* Dump mozilla style lz4json files.
*
* Copyright (c) 2014 Intel Corporation
* Author: Andi Kleen
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* File format reference:
https://dxr.mozilla.org/mozilla-central/source/toolkit/components/lz4/lz4.js
*/
#include <errno.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <endian.h>
#include "lz4.h"
int main(int ac, char **av)
{
while (*++av) {
int fd = open(*av, O_RDONLY);
if (fd < 0) {
perror(*av);
continue;
}
struct stat st;
if (fstat(fd, &st) < 0) {
perror(*av);
exit(1);
}
if (st.st_size < 12) {
fprintf(stderr, "%s: file too short\n", *av);
exit(1);
}
char *map = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (map == (char *)-1) {
perror(*av);
exit(1);
}
if (memcmp(map, "mozLz40", 8)) {
fprintf(stderr, "%s: not a mozLZ4a file\n", *av);
exit(1);
}
size_t outsz = htole32(*(uint32_t *) (map + 8));
char *out = malloc(outsz);
if (!out) {
fprintf(stderr, "Cannot allocate memory\n");
exit(1);
}
if (LZ4_decompress_safe_partial(map + 12, out, st.st_size - 12, outsz, outsz) < 0) {
fprintf(stderr, "%s: decompression error\n", *av);
exit(1);
}
ssize_t decsz = write(1, out, outsz);
if (decsz < 0 || decsz != outsz) {
if (decsz >= 0)
errno = EIO;
perror("write");
exit(1);
}
free(out);
munmap(map, st.st_size);
close(fd);
}
return 0;
}
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