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#include <u.h>
#include <libc.h>
#include <bio.h>
#include <flate.h>
#include "zip.h"
enum
{
HeadAlloc = 64,
};
static void zip(Biobuf *bout, char *file, int stdout);
static void zipDir(Biobuf *bout, int fd, ZipHead *zh, int stdout);
static int crcread(void *fd, void *buf, int n);
static int zwrite(void *bout, void *buf, int n);
static void put4(Biobuf *b, ulong v);
static void put2(Biobuf *b, int v);
static void put1(Biobuf *b, int v);
static void header(Biobuf *bout, ZipHead *zh);
static void trailer(Biobuf *bout, ZipHead *zh, vlong off);
static void putCDir(Biobuf *bout);
static void error(char*, ...);
#pragma varargck argpos error 1
static Biobuf bout;
static ulong crc;
static ulong *crctab;
static int debug;
static int eof;
static int level;
static int nzheads;
static ulong totr;
static ulong totw;
static int verbose;
static int zhalloc;
static ZipHead *zheads;
static jmp_buf zjmp;
void
usage(void)
{
fprint(2, "usage: zip [-vD] [-1-9] [-f zipfile] file ...\n");
exits("usage");
}
void
main(int argc, char *argv[])
{
char *zfile;
int i, fd, err;
zfile = nil;
level = 6;
ARGBEGIN{
case 'D':
debug++;
break;
case 'f':
zfile = ARGF();
if(zfile == nil)
usage();
break;
case 'v':
verbose++;
break;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
level = ARGC() - '0';
break;
default:
usage();
break;
}ARGEND
if(argc == 0)
usage();
crctab = mkcrctab(ZCrcPoly);
err = deflateinit();
if(err != FlateOk)
sysfatal("deflateinit failed: %s", flateerr(err));
if(zfile == nil)
fd = 1;
else{
fd = create(zfile, OWRITE, 0664);
if(fd < 0)
sysfatal("can't create %s: %r", zfile);
}
Binit(&bout, fd, OWRITE);
if(setjmp(zjmp)){
if(zfile != nil){
fprint(2, "zip: removing output file %s\n", zfile);
remove(zfile);
}
exits("errors");
}
for(i = 0; i < argc; i++)
zip(&bout, argv[i], zfile == nil);
putCDir(&bout);
exits(nil);
}
static void
zip(Biobuf *bout, char *file, int stdout)
{
Tm *t;
ZipHead *zh;
Dir *dir;
vlong off;
int fd, err;
fd = open(file, OREAD);
if(fd < 0)
error("can't open %s: %r", file);
dir = dirfstat(fd);
if(dir == nil)
error("can't stat %s: %r", file);
/*
* create the header
*/
if(nzheads >= zhalloc){
zhalloc += HeadAlloc;
zheads = realloc(zheads, zhalloc * sizeof(ZipHead));
if(zheads == nil)
error("out of memory");
}
zh = &zheads[nzheads++];
zh->madeos = ZDos;
zh->madevers = (2 * 10) + 0;
zh->extos = ZDos;
zh->extvers = (2 * 10) + 0;
t = localtime(dir->mtime);
zh->modtime = (t->hour<<11) | (t->min<<5) | (t->sec>>1);
zh->moddate = ((t->year-80)<<9) | ((t->mon+1)<<5) | t->mday;
zh->flags = 0;
zh->crc = 0;
zh->csize = 0;
zh->uncsize = 0;
zh->file = strdup(file);
if(zh->file == nil)
error("out of memory");
zh->iattr = 0;
zh->eattr = ZDArch;
if((dir->mode & 0700) == 0)
zh->eattr |= ZDROnly;
zh->off = Boffset(bout);
if(dir->mode & DMDIR){
zh->eattr |= ZDDir;
zh->meth = 0;
zipDir(bout, fd, zh, stdout);
}else{
zh->meth = 8;
if(stdout)
zh->flags |= ZTrailInfo;
off = Boffset(bout);
header(bout, zh);
crc = 0;
eof = 0;
totr = 0;
totw = 0;
err = deflate(bout, zwrite, (void*)fd, crcread, level, debug);
if(err != FlateOk)
error("deflate failed: %s: %r", flateerr(err));
zh->csize = totw;
zh->uncsize = totr;
zh->crc = crc;
trailer(bout, zh, off);
}
close(fd);
free(dir);
}
static void
zipDir(Biobuf *bout, int fd, ZipHead *zh, int stdout)
{
Dir *dirs;
char *file, *pfile;
int i, nf, nd;
nf = strlen(zh->file) + 1;
if(strcmp(zh->file, ".") == 0){
nzheads--;
free(zh->file);
pfile = "";
nf = 1;
}else{
nf++;
pfile = malloc(nf);
if(pfile == nil)
error("out of memory");
snprint(pfile, nf, "%s/", zh->file);
free(zh->file);
zh->file = pfile;
header(bout, zh);
}
nf += 256; /* plenty of room */
file = malloc(nf);
if(file == nil)
error("out of memory");
while((nd = dirread(fd, &dirs)) > 0){
for(i = 0; i < nd; i++){
snprint(file, nf, "%s%s", pfile, dirs[i].name);
zip(bout, file, stdout);
}
free(dirs);
}
}
static void
header(Biobuf *bout, ZipHead *zh)
{
int flen;
if(verbose)
fprint(2, "adding %s\n", zh->file);
put4(bout, ZHeader);
put1(bout, zh->extvers);
put1(bout, zh->extos);
put2(bout, zh->flags);
put2(bout, zh->meth);
put2(bout, zh->modtime);
put2(bout, zh->moddate);
put4(bout, zh->crc);
put4(bout, zh->csize);
put4(bout, zh->uncsize);
flen = strlen(zh->file);
put2(bout, flen);
put2(bout, 0);
if(Bwrite(bout, zh->file, flen) != flen)
error("write error");
}
static void
trailer(Biobuf *bout, ZipHead *zh, vlong off)
{
vlong coff;
coff = -1;
if(!(zh->flags & ZTrailInfo)){
coff = Boffset(bout);
if(Bseek(bout, off + ZHeadCrc, 0) < 0)
error("can't seek in archive");
}
put4(bout, zh->crc);
put4(bout, zh->csize);
put4(bout, zh->uncsize);
if(!(zh->flags & ZTrailInfo)){
if(Bseek(bout, coff, 0) < 0)
error("can't seek in archive");
}
}
static void
cheader(Biobuf *bout, ZipHead *zh)
{
int flen;
put4(bout, ZCHeader);
put1(bout, zh->madevers);
put1(bout, zh->madeos);
put1(bout, zh->extvers);
put1(bout, zh->extos);
put2(bout, zh->flags & ~ZTrailInfo);
put2(bout, zh->meth);
put2(bout, zh->modtime);
put2(bout, zh->moddate);
put4(bout, zh->crc);
put4(bout, zh->csize);
put4(bout, zh->uncsize);
flen = strlen(zh->file);
put2(bout, flen);
put2(bout, 0);
put2(bout, 0);
put2(bout, 0);
put2(bout, zh->iattr);
put4(bout, zh->eattr);
put4(bout, zh->off);
if(Bwrite(bout, zh->file, flen) != flen)
error("write error");
}
static void
putCDir(Biobuf *bout)
{
vlong hoff, ecoff;
int i;
hoff = Boffset(bout);
for(i = 0; i < nzheads; i++)
cheader(bout, &zheads[i]);
ecoff = Boffset(bout);
if(nzheads >= (1 << 16))
error("too many entries in zip file: max %d", (1 << 16) - 1);
put4(bout, ZECHeader);
put2(bout, 0);
put2(bout, 0);
put2(bout, nzheads);
put2(bout, nzheads);
put4(bout, ecoff - hoff);
put4(bout, hoff);
put2(bout, 0);
}
static int
crcread(void *fd, void *buf, int n)
{
int nr, m;
nr = 0;
for(; !eof && n > 0; n -= m){
m = read((int)(uintptr)fd, (char*)buf+nr, n);
if(m <= 0){
eof = 1;
if(m < 0)
{
fprint(2, "input error %r\n");
return -1;
}
break;
}
nr += m;
}
crc = blockcrc(crctab, crc, buf, nr);
totr += nr;
return nr;
}
static int
zwrite(void *bout, void *buf, int n)
{
if(n != Bwrite(bout, buf, n)){
eof = 1;
return -1;
}
totw += n;
return n;
}
static void
put4(Biobuf *b, ulong v)
{
int i;
for(i = 0; i < 4; i++){
if(Bputc(b, v) < 0)
error("write error");
v >>= 8;
}
}
static void
put2(Biobuf *b, int v)
{
int i;
for(i = 0; i < 2; i++){
if(Bputc(b, v) < 0)
error("write error");
v >>= 8;
}
}
static void
put1(Biobuf *b, int v)
{
if(Bputc(b, v)< 0)
error("unexpected eof reading file information");
}
static void
error(char *fmt, ...)
{
va_list arg;
fprint(2, "zip: ");
va_start(arg, fmt);
vfprint(2, fmt, arg);
va_end(arg);
fprint(2, "\n");
longjmp(zjmp, 1);
}