freebsd-dev/usr.bin/mkuzip/mkuzip.c
Maxim Sobolev 0b99ac6313 o Print more info in the verbose mode;
o use zlib(3) function which computes maximum length of the output
  buffer instead of rolling own version;

o allow size of input file to be not multiple of cluster size by applying
  zero padding.
2004-09-10 23:16:05 +00:00

261 lines
5.8 KiB
C

/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <sobomax@FreeBSD.ORG> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Maxim Sobolev
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*
*/
#include <sys/types.h>
#include <sys/endian.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <zlib.h>
#include <err.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define CLSTSIZE 16384
#define DEFAULT_SUFX ".uzip"
#define CLOOP_MAGIC_LEN 128
static char CLOOP_MAGIC_START[] = "#!/bin/sh\n#V2.0 Format\n"
"m=geom_uzip\n(kldstat -n $m 2>&-||kldload $m)>&-&&"
"mount_cd9660 /dev/`mdconfig -af $0`.uzip $1\nexit $?\n";
static char *readblock(int, char *, u_int32_t);
static void usage(void);
static void *safe_malloc(size_t);
static void cleanup(void);
static char *cleanfile = NULL;
int main(int argc, char **argv)
{
char *iname, *oname, *obuf, *ibuf;
uint64_t *toc;
int fdr, fdw, i, opt, verbose, tmp;
struct iovec iov[2];
struct stat sb;
uLongf destlen;
uint64_t offset;
struct cloop_header {
char magic[CLOOP_MAGIC_LEN]; /* cloop magic */
uint32_t blksz; /* block size */
uint32_t nblocks; /* number of blocks */
} hdr;
memset(&hdr, 0, sizeof(hdr));
hdr.blksz = CLSTSIZE;
strcpy(hdr.magic, CLOOP_MAGIC_START);
oname = NULL;
verbose = 0;
while((opt = getopt(argc, argv, "o:s:v")) != -1) {
switch(opt) {
case 'o':
oname = optarg;
break;
case 's':
tmp = atoi(optarg);
if (tmp <= 0) {
errx(1, "invalid cluster size specified: %s",
optarg);
/* Not reached */
}
if (tmp % DEV_BSIZE != 0) {
errx(1, "cluster size should be multiple of %d",
DEV_BSIZE);
/* Not reached */
}
if (compressBound(tmp) > MAXPHYS) {
errx(1, "cluster size is too large");
/* Not reached */
}
hdr.blksz = tmp;
break;
case 'v':
verbose = 1;
break;
default:
usage();
/* Not reached */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usage();
/* Not reached */
}
iname = argv[0];
if (oname == NULL) {
asprintf(&oname, "%s%s", iname, DEFAULT_SUFX);
if (oname == NULL) {
err(1, "can't allocate memory");
/* Not reached */
}
}
obuf = safe_malloc(compressBound(hdr.blksz));
ibuf = safe_malloc(hdr.blksz);
signal(SIGHUP, exit);
signal(SIGINT, exit);
signal(SIGTERM, exit);
signal(SIGXCPU, exit);
signal(SIGXFSZ, exit);
atexit(cleanup);
if (stat(iname, &sb) != 0) {
err(1, "%s", iname);
/* Not reached */
}
hdr.nblocks = sb.st_size / hdr.blksz;
if ((sb.st_size % hdr.blksz) != 0) {
if (verbose != 0)
fprintf(stderr, "file size is not multiple "
"of %d, padding data\n", hdr.blksz);
hdr.nblocks++;
}
toc = safe_malloc((hdr.nblocks + 1) * sizeof(*toc));
fdr = open(iname, O_RDONLY);
if (fdr < 0) {
err(1, "%s", iname);
/* Not reached */
}
fdw = open(oname, O_WRONLY | O_TRUNC | O_CREAT,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fdw < 0) {
err(1, "%s", oname);
/* Not reached */
}
cleanfile = oname;
/* Prepare header that we will write later when we have index ready. */
iov[0].iov_base = (char *)&hdr;
iov[0].iov_len = sizeof(hdr);
iov[1].iov_base = (char *)toc;
iov[1].iov_len = (hdr.nblocks + 1) * sizeof(*toc);
offset = iov[0].iov_len + iov[1].iov_len;
/* Reserve space for header */
lseek(fdw, offset, SEEK_SET);
if (verbose != 0)
fprintf(stderr, "data size %llu bytes, number of clusters "
"%u, index lengh %u bytes\n", sb.st_size,
hdr.nblocks, iov[1].iov_len);
for(i = 0; i == 0 || ibuf != NULL; i++) {
ibuf = readblock(fdr, ibuf, hdr.blksz);
if (ibuf != NULL) {
destlen = compressBound(hdr.blksz);
if (compress2(obuf, &destlen, ibuf, hdr.blksz,
Z_BEST_COMPRESSION) != Z_OK) {
errx(1, "can't compress data: compress2() "
"failed");
/* Not reached */
}
if (verbose != 0)
fprintf(stderr, "cluster #%d, in %u bytes, "
"out %lu bytes\n", i, hdr.blksz, destlen);
} else {
destlen = DEV_BSIZE - (offset % DEV_BSIZE);
memset(obuf, 0, destlen);
if (verbose != 0)
fprintf(stderr, "padding data with %lu bytes so "
"that file size is multiple of %d\n", destlen,
DEV_BSIZE);
}
if (write(fdw, obuf, destlen) < 0) {
err(1, "%s", oname);
/* Not reached */
}
toc[i] = htobe64(offset);
offset += destlen;
}
close(fdr);
if (verbose != 0)
fprintf(stderr, "compressed data to %llu bytes, saved %lld "
"bytes, %.2f%% decrease.\n", offset, (long long)(sb.st_size - offset),
100.0 * (long long)(sb.st_size - offset) / (float)sb.st_size);
/* Convert to big endian */
hdr.blksz = htonl(hdr.blksz);
hdr.nblocks = htonl(hdr.nblocks);
/* Write headers into pre-allocated space */
lseek(fdw, 0, SEEK_SET);
if (writev(fdw, iov, 2) < 0) {
err(1, "%s", oname);
/* Not reached */
}
cleanfile = NULL;
close(fdw);
exit(0);
}
static char *
readblock(int fd, char *ibuf, u_int32_t clstsize)
{
int numread;
bzero(ibuf, clstsize);
numread = read(fd, ibuf, clstsize);
if (numread < 0) {
err(1, "read() failed");
/* Not reached */
}
if (numread == 0) {
return NULL;
}
return ibuf;
}
static void
usage(void)
{
fprintf(stderr, "usage: mkuzip [-v] [-o outfile] [-s cluster_size] infile\n");
exit(1);
}
static void *
safe_malloc(size_t size)
{
void *retval;
retval = malloc(size);
if (retval == NULL) {
err(1, "can't allocate memory");
/* Not reached */
}
return retval;
}
static void
cleanup(void)
{
if (cleanfile != NULL)
unlink(cleanfile);
}