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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdarg.h>
#include <fcntl.h>
#include <termios.h>
#include <zlib.h> // for adler32()
static int verbose = 0;
/*
* Android File Archive format:
*
* magic[5]: 'A' 'F' 'A' 'R' '\n'
* version[4]: 0x00 0x00 0x00 0x01
* for each file:
* file magic[4]: 'F' 'I' 'L' 'E'
* namelen[4]: Length of file name, including NUL byte (big-endian)
* name[*]: NUL-terminated file name
* datalen[4]: Length of file (big-endian)
* data[*]: Unencoded file data
* adler32[4]: adler32 of the unencoded file data (big-endian)
* file end magic[4]: 'f' 'i' 'l' 'e'
* end magic[4]: 'E' 'N' 'D' 0x00
*
* This format is about as simple as possible; it was designed to
* make it easier to transfer multiple files over an stdin/stdout
* pipe to another process, so word-alignment wasn't necessary.
*/
static void
die(const char *why, ...)
{
va_list ap;
va_start(ap, why);
fprintf(stderr, "error: ");
vfprintf(stderr, why, ap);
fprintf(stderr, "\n");
va_end(ap);
exit(1);
}
static void
write_big_endian(size_t v)
{
putchar((v >> 24) & 0xff);
putchar((v >> 16) & 0xff);
putchar((v >> 8) & 0xff);
putchar( v & 0xff);
}
static void
_eject(struct stat *s, char *out, int olen, char *data, size_t datasize)
{
unsigned long adler;
/* File magic.
*/
printf("FILE");
/* Name length includes the NUL byte.
*/
write_big_endian(olen + 1);
/* File name and terminating NUL.
*/
printf("%s", out);
putchar('\0');
/* File length.
*/
write_big_endian(datasize);
/* File data.
*/
if (fwrite(data, 1, datasize, stdout) != datasize) {
die("Error writing file data");
}
/* Checksum.
*/
adler = adler32(0, NULL, 0);
adler = adler32(adler, (unsigned char *)data, datasize);
write_big_endian(adler);
/* File end magic.
*/
printf("file");
}
static void _archive(char *in, int ilen);
static void
_archive_dir(char *in, int ilen)
{
int t;
DIR *d;
struct dirent *de;
if (verbose) {
fprintf(stderr, "_archive_dir('%s', %d)\n", in, ilen);
}
d = opendir(in);
if (d == 0) {
die("cannot open directory '%s'", in);
}
while ((de = readdir(d)) != 0) {
/* xxx: feature? maybe some dotfiles are okay */
if (strcmp(de->d_name, ".") == 0 ||
strcmp(de->d_name, "..") == 0)
{
continue;
}
t = strlen(de->d_name);
in[ilen] = '/';
memcpy(in + ilen + 1, de->d_name, t + 1);
_archive(in, ilen + t + 1);
in[ilen] = '\0';
}
}
static void
_archive(char *in, int ilen)
{
struct stat s;
if (verbose) {
fprintf(stderr, "_archive('%s', %d)\n", in, ilen);
}
if (lstat(in, &s)) {
die("could not stat '%s'\n", in);
}
if (S_ISREG(s.st_mode)) {
char *tmp;
int fd;
fd = open(in, O_RDONLY);
if (fd < 0) {
die("cannot open '%s' for read", in);
}
tmp = (char*) malloc(s.st_size);
if (tmp == 0) {
die("cannot allocate %d bytes", s.st_size);
}
if (read(fd, tmp, s.st_size) != s.st_size) {
die("cannot read %d bytes", s.st_size);
}
_eject(&s, in, ilen, tmp, s.st_size);
free(tmp);
close(fd);
} else if (S_ISDIR(s.st_mode)) {
_archive_dir(in, ilen);
} else {
/* We don't handle links, etc. */
die("Unknown '%s' (mode %d)?\n", in, s.st_mode);
}
}
void archive(const char *start)
{
char in[8192];
strcpy(in, start);
_archive_dir(in, strlen(in));
}
int
main(int argc, char *argv[])
{
struct termios old_termios;
if (argc == 1) {
die("usage: %s <dir-list>", argv[0]);
}
argc--;
argv++;
/* Force stdout into raw mode.
*/
struct termios s;
if (tcgetattr(1, &s) < 0) {
die("Could not get termios for stdout");
}
old_termios = s;
cfmakeraw(&s);
if (tcsetattr(1, TCSANOW, &s) < 0) {
die("Could not set termios for stdout");
}
/* Print format magic and version.
*/
printf("AFAR\n");
write_big_endian(1);
while (argc-- > 0) {
archive(*argv++);
}
/* Print end magic.
*/
printf("END");
putchar('\0');
/* Restore stdout.
*/
if (tcsetattr(1, TCSANOW, &old_termios) < 0) {
die("Could not restore termios for stdout");
}
return 0;
}
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