add gzip, bzip2
'
This commit is contained in:
rsc
parent
4314729dde
commit
ff3adf6082
44 changed files with 9880 additions and 2 deletions
740
src/cmd/gzip/unzip.c
Normal file
740
src/cmd/gzip/unzip.c
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@ -0,0 +1,740 @@
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <flate.h>
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#include "zip.h"
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enum
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{
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BufSize = 4096
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};
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static int cheader(Biobuf *bin, ZipHead *zh);
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static int copyout(int ofd, Biobuf *bin, long len);
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static int crcwrite(void *ofd, void *buf, int n);
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static int findCDir(Biobuf *bin, char *file);
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static int get1(Biobuf *b);
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static int get2(Biobuf *b);
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static ulong get4(Biobuf *b);
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static char *getname(Biobuf *b, int len);
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static int header(Biobuf *bin, ZipHead *zh);
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static long msdos2time(int time, int date);
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static int sunzip(Biobuf *bin);
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static int sunztable(Biobuf *bin);
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static void trailer(Biobuf *bin, ZipHead *zh);
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static int unzip(Biobuf *bin, char *file);
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static int unzipEntry(Biobuf *bin, ZipHead *czh);
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static int unztable(Biobuf *bin, char *file);
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static int wantFile(char *file);
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static void *emalloc(ulong);
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static void error(char*, ...);
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/* #pragma varargck argpos error 1 */
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static Biobuf bin;
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static ulong crc;
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static ulong *crctab;
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static int debug;
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static char *delfile;
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static int lower;
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static int nwant;
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static ulong rlen;
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static int settimes;
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static int stdout;
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static int verbose;
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static char **want;
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static int wbad;
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static ulong wlen;
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static jmp_buf zjmp;
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static void
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usage(void)
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{
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fprint(2, "usage: unzip [-tsv] [-f zipfile] [file ...]\n");
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exits("usage");
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}
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void
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main(int argc, char *argv[])
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{
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char *zfile;
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int fd, ok, table, stream;
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table = 0;
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stream = 0;
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zfile = nil;
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ARGBEGIN{
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case 'D':
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debug++;
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break;
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case 'c':
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stdout++;
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break;
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case 'i':
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lower++;
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break;
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case 'f':
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zfile = ARGF();
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if(zfile == nil)
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usage();
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break;
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case 's':
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stream++;
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break;
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case 't':
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table++;
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break;
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case 'T':
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settimes++;
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break;
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case 'v':
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verbose++;
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break;
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default:
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usage();
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break;
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}ARGEND
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nwant = argc;
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want = argv;
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crctab = mkcrctab(ZCrcPoly);
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ok = inflateinit();
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if(ok != FlateOk)
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sysfatal("inflateinit failed: %s\n", flateerr(ok));
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if(zfile == nil){
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Binit(&bin, 0, OREAD);
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zfile = "<stdin>";
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}else{
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fd = open(zfile, OREAD);
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if(fd < 0)
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sysfatal("can't open %s: %r", zfile);
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Binit(&bin, fd, OREAD);
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}
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if(table){
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if(stream)
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ok = sunztable(&bin);
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else
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ok = unztable(&bin, zfile);
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}else{
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if(stream)
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ok = sunzip(&bin);
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else
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ok = unzip(&bin, zfile);
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}
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exits(ok ? nil: "errors");
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}
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/*
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* print the table of contents from the "central directory structure"
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*/
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static int
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unztable(Biobuf *bin, char *file)
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{
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ZipHead zh;
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int entries;
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entries = findCDir(bin, file);
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if(entries < 0)
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return 0;
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if(verbose > 1)
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print("%d items in the archive\n", entries);
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while(entries-- > 0){
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if(setjmp(zjmp)){
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free(zh.file);
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return 0;
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}
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memset(&zh, 0, sizeof(zh));
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if(!cheader(bin, &zh))
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return 1;
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if(wantFile(zh.file)){
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if(verbose)
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print("%-32s %10lud %s", zh.file, zh.uncsize, ctime(msdos2time(zh.modtime, zh.moddate)));
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else
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print("%s\n", zh.file);
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if(verbose > 1){
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print("\tmade by os %d vers %d.%d\n", zh.madeos, zh.madevers/10, zh.madevers % 10);
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print("\textract by os %d vers %d.%d\n", zh.extos, zh.extvers/10, zh.extvers % 10);
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print("\tflags %x\n", zh.flags);
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print("\tmethod %d\n", zh.meth);
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print("\tmod time %d\n", zh.modtime);
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print("\tmod date %d\n", zh.moddate);
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print("\tcrc %lux\n", zh.crc);
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print("\tcompressed size %lud\n", zh.csize);
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print("\tuncompressed size %lud\n", zh.uncsize);
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print("\tinternal attributes %ux\n", zh.iattr);
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print("\texternal attributes %lux\n", zh.eattr);
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print("\tstarts at %ld\n", zh.off);
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}
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}
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free(zh.file);
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zh.file = nil;
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}
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return 1;
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}
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/*
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* print the "local file header" table of contents
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*/
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static int
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sunztable(Biobuf *bin)
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{
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ZipHead zh;
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vlong off;
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ulong hcrc, hcsize, huncsize;
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int ok, err;
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ok = 1;
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for(;;){
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if(setjmp(zjmp)){
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free(zh.file);
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return 0;
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}
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memset(&zh, 0, sizeof(zh));
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if(!header(bin, &zh))
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return ok;
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hcrc = zh.crc;
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hcsize = zh.csize;
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huncsize = zh.uncsize;
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wlen = 0;
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rlen = 0;
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crc = 0;
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wbad = 0;
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if(zh.meth == 0){
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if(!copyout(-1, bin, zh.csize))
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error("reading data for %s failed: %r", zh.file);
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}else if(zh.meth == 8){
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off = Boffset(bin);
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err = inflate((void*)-1, crcwrite, bin, (int(*)(void*))Bgetc);
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if(err != FlateOk)
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error("inflate %s failed: %s", zh.file, flateerr(err));
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rlen = Boffset(bin) - off;
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}else
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error("can't handle compression method %d for %s", zh.meth, zh.file);
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trailer(bin, &zh);
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if(wantFile(zh.file)){
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if(verbose)
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print("%-32s %10lud %s", zh.file, zh.uncsize, ctime(msdos2time(zh.modtime, zh.moddate)));
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else
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print("%s\n", zh.file);
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if(verbose > 1){
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print("\textract by os %d vers %d.%d\n", zh.extos, zh.extvers / 10, zh.extvers % 10);
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print("\tflags %x\n", zh.flags);
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print("\tmethod %d\n", zh.meth);
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print("\tmod time %d\n", zh.modtime);
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print("\tmod date %d\n", zh.moddate);
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print("\tcrc %lux\n", zh.crc);
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print("\tcompressed size %lud\n", zh.csize);
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print("\tuncompressed size %lud\n", zh.uncsize);
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if((zh.flags & ZTrailInfo) && (hcrc || hcsize || huncsize)){
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print("\theader crc %lux\n", zh.crc);
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print("\theader compressed size %lud\n", zh.csize);
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print("\theader uncompressed size %lud\n", zh.uncsize);
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}
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}
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}
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if(zh.crc != crc)
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error("crc mismatch for %s", zh.file);
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if(zh.uncsize != wlen)
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error("output size mismatch for %s", zh.file);
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if(zh.csize != rlen)
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error("input size mismatch for %s", zh.file);
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free(zh.file);
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zh.file = nil;
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}
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return ok;
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}
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/*
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* extract files using the info in the central directory structure
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*/
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static int
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unzip(Biobuf *bin, char *file)
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{
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ZipHead zh;
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vlong off;
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int ok, eok, entries;
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entries = findCDir(bin, file);
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if(entries < 0)
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return 0;
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ok = 1;
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while(entries-- > 0){
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if(setjmp(zjmp)){
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free(zh.file);
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return 0;
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}
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memset(&zh, 0, sizeof(zh));
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if(!cheader(bin, &zh))
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return ok;
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off = Boffset(bin);
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if(wantFile(zh.file)){
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if(Bseek(bin, zh.off, 0) < 0){
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fprint(2, "unzip: can't seek to start of %s, skipping\n", zh.file);
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ok = 0;
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}else{
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eok = unzipEntry(bin, &zh);
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if(eok <= 0){
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fprint(2, "unzip: skipping %s\n", zh.file);
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ok = 0;
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}
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}
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}
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free(zh.file);
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zh.file = nil;
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if(Bseek(bin, off, 0) < 0){
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fprint(2, "unzip: can't seek to start of next entry, terminating extraction\n");
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return 0;
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}
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}
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return ok;
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}
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/*
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* extract files using the info the "local file headers"
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*/
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static int
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sunzip(Biobuf *bin)
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{
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int eok;
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for(;;){
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eok = unzipEntry(bin, nil);
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if(eok == 0)
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return 1;
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if(eok < 0)
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return 0;
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}
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return 1;
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}
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/*
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* extracts a single entry from a zip file
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* czh is the optional corresponding central directory entry
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*/
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static int
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unzipEntry(Biobuf *bin, ZipHead *czh)
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{
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Dir *d;
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ZipHead zh;
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char *p;
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vlong off;
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int fd, isdir, ok, err;
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zh.file = nil;
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if(setjmp(zjmp)){
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delfile = nil;
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free(zh.file);
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return -1;
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}
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memset(&zh, 0, sizeof(zh));
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if(!header(bin, &zh))
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return 0;
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ok = 1;
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isdir = 0;
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fd = -1;
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if(wantFile(zh.file)){
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if(verbose)
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fprint(2, "extracting %s\n", zh.file);
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if(czh != nil && czh->extos == ZDos){
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isdir = czh->eattr & ZDDir;
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if(isdir && zh.uncsize != 0)
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fprint(2, "unzip: ignoring directory data for %s\n", zh.file);
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}
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if(zh.meth == 0 && zh.uncsize == 0){
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p = strchr(zh.file, '\0');
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if(p > zh.file && p[-1] == '/')
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isdir = 1;
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}
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if(stdout){
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if(ok && !isdir)
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fd = 1;
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}else if(isdir){
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fd = create(zh.file, OREAD, DMDIR | 0775);
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if(fd < 0){
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d = dirstat(zh.file);
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if(d == nil || (d->mode & DMDIR) != DMDIR){
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fprint(2, "unzip: can't create directory %s: %r\n", zh.file);
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ok = 0;
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}
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free(d);
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}
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}else if(ok){
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fd = create(zh.file, OWRITE, 0664);
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if(fd < 0){
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fprint(2, "unzip: can't create %s: %r\n", zh.file);
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ok = 0;
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}else
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delfile = zh.file;
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}
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}
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wlen = 0;
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rlen = 0;
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crc = 0;
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wbad = 0;
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if(zh.meth == 0){
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if(!copyout(fd, bin, zh.csize))
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error("copying data for %s failed: %r", zh.file);
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}else if(zh.meth == 8){
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off = Boffset(bin);
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err = inflate((void*)fd, crcwrite, bin, (int(*)(void*))Bgetc);
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if(err != FlateOk)
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error("inflate failed: %s", flateerr(err));
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rlen = Boffset(bin) - off;
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}else
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error("can't handle compression method %d for %s", zh.meth, zh.file);
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trailer(bin, &zh);
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if(zh.crc != crc)
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error("crc mismatch for %s", zh.file);
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if(zh.uncsize != wlen)
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error("output size mismatch for %s", zh.file);
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if(zh.csize != rlen)
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error("input size mismatch for %s", zh.file);
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delfile = nil;
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free(zh.file);
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if(fd >= 0 && !stdout){
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if(settimes){
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d = dirfstat(fd);
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if(d != nil){
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d->mtime = msdos2time(zh.modtime, zh.moddate);
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if(d->mtime)
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dirfwstat(fd, d);
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}
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}
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close(fd);
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}
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return ok;
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}
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static int
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wantFile(char *file)
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{
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int i, n;
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if(nwant == 0)
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return 1;
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for(i = 0; i < nwant; i++){
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if(strcmp(want[i], file) == 0)
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return 1;
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n = strlen(want[i]);
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if(strncmp(want[i], file, n) == 0 && file[n] == '/')
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return 1;
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}
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return 0;
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}
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/*
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* find the start of the central directory
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* returns the number of entries in the directory,
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* or -1 if there was an error
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*/
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static int
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findCDir(Biobuf *bin, char *file)
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{
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vlong ecoff;
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long off, size;
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int entries, zclen, dn, ds, de;
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ecoff = Bseek(bin, -ZECHeadSize, 2);
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if(ecoff < 0){
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fprint(2, "unzip: can't seek to contents of %s; try adding -s\n", file);
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return -1;
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}
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if(setjmp(zjmp))
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return -1;
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if(get4(bin) != ZECHeader){
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fprint(2, "unzip: bad magic number for contents of %s\n", file);
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return -1;
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}
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dn = get2(bin);
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ds = get2(bin);
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de = get2(bin);
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entries = get2(bin);
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size = get4(bin);
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off = get4(bin);
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zclen = get2(bin);
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while(zclen-- > 0)
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get1(bin);
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if(verbose > 1){
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print("table starts at %ld for %ld bytes\n", off, size);
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if(ecoff - size != off)
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print("\ttable should start at %lld-%ld=%lld\n", ecoff, size, ecoff-size);
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if(dn || ds || de != entries)
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print("\tcurrent disk=%d start disk=%d table entries on this disk=%d\n", dn, ds, de);
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}
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if(Bseek(bin, off, 0) != off){
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fprint(2, "unzip: can't seek to start of contents of %s\n", file);
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return -1;
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}
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return entries;
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}
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static int
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cheader(Biobuf *bin, ZipHead *zh)
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||||
{
|
||||
ulong v;
|
||||
int flen, xlen, fclen;
|
||||
|
||||
v = get4(bin);
|
||||
if(v != ZCHeader){
|
||||
if(v == ZECHeader)
|
||||
return 0;
|
||||
error("bad magic number %lux", v);
|
||||
}
|
||||
zh->madevers = get1(bin);
|
||||
zh->madeos = get1(bin);
|
||||
zh->extvers = get1(bin);
|
||||
zh->extos = get1(bin);
|
||||
zh->flags = get2(bin);
|
||||
zh->meth = get2(bin);
|
||||
zh->modtime = get2(bin);
|
||||
zh->moddate = get2(bin);
|
||||
zh->crc = get4(bin);
|
||||
zh->csize = get4(bin);
|
||||
zh->uncsize = get4(bin);
|
||||
flen = get2(bin);
|
||||
xlen = get2(bin);
|
||||
fclen = get2(bin);
|
||||
get2(bin); /* disk number start */
|
||||
zh->iattr = get2(bin);
|
||||
zh->eattr = get4(bin);
|
||||
zh->off = get4(bin);
|
||||
|
||||
zh->file = getname(bin, flen);
|
||||
|
||||
while(xlen-- > 0)
|
||||
get1(bin);
|
||||
|
||||
while(fclen-- > 0)
|
||||
get1(bin);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
header(Biobuf *bin, ZipHead *zh)
|
||||
{
|
||||
ulong v;
|
||||
int flen, xlen;
|
||||
|
||||
v = get4(bin);
|
||||
if(v != ZHeader){
|
||||
if(v == ZCHeader)
|
||||
return 0;
|
||||
error("bad magic number %lux at %lld", v, Boffset(bin)-4);
|
||||
}
|
||||
zh->extvers = get1(bin);
|
||||
zh->extos = get1(bin);
|
||||
zh->flags = get2(bin);
|
||||
zh->meth = get2(bin);
|
||||
zh->modtime = get2(bin);
|
||||
zh->moddate = get2(bin);
|
||||
zh->crc = get4(bin);
|
||||
zh->csize = get4(bin);
|
||||
zh->uncsize = get4(bin);
|
||||
flen = get2(bin);
|
||||
xlen = get2(bin);
|
||||
|
||||
zh->file = getname(bin, flen);
|
||||
|
||||
while(xlen-- > 0)
|
||||
get1(bin);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void
|
||||
trailer(Biobuf *bin, ZipHead *zh)
|
||||
{
|
||||
if(zh->flags & ZTrailInfo){
|
||||
zh->crc = get4(bin);
|
||||
zh->csize = get4(bin);
|
||||
zh->uncsize = get4(bin);
|
||||
}
|
||||
}
|
||||
|
||||
static char*
|
||||
getname(Biobuf *bin, int len)
|
||||
{
|
||||
char *s;
|
||||
int i, c;
|
||||
|
||||
s = emalloc(len + 1);
|
||||
for(i = 0; i < len; i++){
|
||||
c = get1(bin);
|
||||
if(lower)
|
||||
c = tolower(c);
|
||||
s[i] = c;
|
||||
}
|
||||
s[i] = '\0';
|
||||
return s;
|
||||
}
|
||||
|
||||
static int
|
||||
crcwrite(void *out, void *buf, int n)
|
||||
{
|
||||
int fd, nw;
|
||||
|
||||
wlen += n;
|
||||
crc = blockcrc(crctab, crc, buf, n);
|
||||
fd = (int)out;
|
||||
if(fd < 0)
|
||||
return n;
|
||||
nw = write(fd, buf, n);
|
||||
if(nw != n)
|
||||
wbad = 1;
|
||||
return nw;
|
||||
}
|
||||
|
||||
static int
|
||||
copyout(int ofd, Biobuf *bin, long len)
|
||||
{
|
||||
char buf[BufSize];
|
||||
int n;
|
||||
|
||||
for(; len > 0; len -= n){
|
||||
n = len;
|
||||
if(n > BufSize)
|
||||
n = BufSize;
|
||||
n = Bread(bin, buf, n);
|
||||
if(n <= 0)
|
||||
return 0;
|
||||
rlen += n;
|
||||
if(crcwrite((void*)ofd, buf, n) != n)
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static ulong
|
||||
get4(Biobuf *b)
|
||||
{
|
||||
ulong v;
|
||||
int i, c;
|
||||
|
||||
v = 0;
|
||||
for(i = 0; i < 4; i++){
|
||||
c = Bgetc(b);
|
||||
if(c < 0)
|
||||
error("unexpected eof reading file information");
|
||||
v |= c << (i * 8);
|
||||
}
|
||||
return v;
|
||||
}
|
||||
|
||||
static int
|
||||
get2(Biobuf *b)
|
||||
{
|
||||
int i, c, v;
|
||||
|
||||
v = 0;
|
||||
for(i = 0; i < 2; i++){
|
||||
c = Bgetc(b);
|
||||
if(c < 0)
|
||||
error("unexpected eof reading file information");
|
||||
v |= c << (i * 8);
|
||||
}
|
||||
return v;
|
||||
}
|
||||
|
||||
static int
|
||||
get1(Biobuf *b)
|
||||
{
|
||||
int c;
|
||||
|
||||
c = Bgetc(b);
|
||||
if(c < 0)
|
||||
error("unexpected eof reading file information");
|
||||
return c;
|
||||
}
|
||||
|
||||
static long
|
||||
msdos2time(int time, int date)
|
||||
{
|
||||
Tm tm;
|
||||
|
||||
tm.hour = time >> 11;
|
||||
tm.min = (time >> 5) & 63;
|
||||
tm.sec = (time & 31) << 1;
|
||||
tm.year = 80 + (date >> 9);
|
||||
tm.mon = ((date >> 5) & 15) - 1;
|
||||
tm.mday = date & 31;
|
||||
tm.zone[0] = '\0';
|
||||
tm.yday = 0;
|
||||
|
||||
return tm2sec(&tm);
|
||||
}
|
||||
|
||||
static void*
|
||||
emalloc(ulong n)
|
||||
{
|
||||
void *p;
|
||||
|
||||
p = malloc(n);
|
||||
if(p == nil)
|
||||
sysfatal("out of memory");
|
||||
return p;
|
||||
}
|
||||
|
||||
static void
|
||||
error(char *fmt, ...)
|
||||
{
|
||||
va_list arg;
|
||||
|
||||
fprint(2, "unzip: ");
|
||||
va_start(arg, fmt);
|
||||
vfprint(2, fmt, arg);
|
||||
va_end(arg);
|
||||
fprint(2, "\n");
|
||||
|
||||
if(delfile != nil){
|
||||
fprint(2, "unzip: removing output file %s\n", delfile);
|
||||
remove(delfile);
|
||||
delfile = nil;
|
||||
}
|
||||
|
||||
longjmp(zjmp, 1);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue