add gzip, bzip2

'

src/cmd/bzip2/bzip2.c

@@ -0,0 +1,190 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include "bzlib.h"
+
+static	int	bzipf(char*, int);
+static	int	bzip(char*, long, int, Biobuf*);
+
+static	Biobuf	bout;
+static	int	level;
+static	int	debug;
+static	int	verbose;
+
+
+static void
+usage(void)
+{
+	fprint(2, "usage: bzip2 [-vcD] [-1-9] [file ...]\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int i, ok, stdout;
+
+	level = 6;
+	stdout = 0;
+	ARGBEGIN{
+	case 'D':
+		debug++;
+		break;
+	case 'v':
+		verbose++;
+		break;
+	case 'c':
+		stdout++;
+		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){
+		Binit(&bout, 1, OWRITE);
+		ok = bzip(nil, time(0), 0, &bout);
+		Bterm(&bout);
+	}else{
+		ok = 1;
+		for(i = 0; i < argc; i++)
+			ok &= bzipf(argv[i], stdout);
+	}
+	exits(ok ? nil: "errors");
+}
+
+static int
+bzipf(char *file, int stdout)
+{
+	Dir *dir;
+	char ofile[128], *f, *s;
+	int ifd, ofd, ok;
+
+	ifd = open(file, OREAD);
+	if(ifd < 0){
+		fprint(2, "bzip2: can't open %s: %r\n", file);
+		return 0;
+	}
+	dir = dirfstat(ifd);
+	if(dir == nil){
+		fprint(2, "bzip2: can't stat %s: %r\n", file);
+		close(ifd);
+		return 0;
+	}
+	if(dir->mode & DMDIR){
+		fprint(2, "bzip2: can't compress a directory\n");
+		close(ifd);
+		free(dir);
+		return 0;
+	}
+
+	if(stdout){
+		ofd = 1;
+		strcpy(ofile, "<stdout>");
+	}else{
+		f = strrchr(file, '/');
+		if(f != nil)
+			f++;
+		else
+			f = file;
+		s = strrchr(f, '.');
+		if(s != nil && s != ofile && strcmp(s, ".tar") == 0){
+			*s = '\0';
+			snprint(ofile, sizeof(ofile), "%s.tbz", f);
+		}else
+			snprint(ofile, sizeof(ofile), "%s.bz2", f);
+		ofd = create(ofile, OWRITE, 0666);
+		if(ofd < 0){
+			fprint(2, "bzip2: can't open %s: %r\n", ofile);
+			free(dir);
+			close(ifd);
+			return 0;
+		}
+	}
+
+	if(verbose)
+		fprint(2, "compressing %s to %s\n", file, ofile);
+
+	Binit(&bout, ofd, OWRITE);
+	ok = bzip(file, dir->mtime, ifd, &bout);
+	if(!ok || Bflush(&bout) < 0){
+		fprint(2, "bzip2: error writing %s: %r\n", ofile);
+		if(!stdout)
+			remove(ofile);
+	}
+	Bterm(&bout);
+	free(dir);
+	close(ifd);
+	close(ofd);
+	return ok;
+}
+
+static int
+bzip(char *file, long mtime, int ifd, Biobuf *bout)
+{
+	int e, n, done, onemore;
+	char buf[8192];
+	char obuf[8192];
+	Biobuf bin;
+	bz_stream strm;
+
+	USED(file);
+	USED(mtime);
+
+	memset(&strm, 0, sizeof strm);
+	BZ2_bzCompressInit(&strm, level, verbose, 0);
+
+	strm.next_in = buf;
+	strm.avail_in = 0;
+	strm.next_out = obuf;
+	strm.avail_out = sizeof obuf;
+
+	done = 0;
+	Binit(&bin, ifd, OREAD);
+
+	/*
+	 * onemore is a crummy hack to go 'round the loop
+	 * once after we finish, to flush the output buffer.
+	 */
+	onemore = 1;
+	SET(e);
+	do {
+		if(!done && strm.avail_in < sizeof buf) {
+			if(strm.avail_in)
+				memmove(buf, strm.next_in, strm.avail_in);
+			
+			n = Bread(&bin, buf+strm.avail_in, sizeof(buf)-strm.avail_in);
+			if(n <= 0)
+				done = 1;
+			else
+				strm.avail_in += n;
+			strm.next_in = buf;
+		}
+		if(strm.avail_out < sizeof obuf) {
+			Bwrite(bout, obuf, sizeof(obuf)-strm.avail_out);
+			strm.next_out = obuf;
+			strm.avail_out = sizeof obuf;
+		}
+
+		if(onemore == 0)
+			break;
+	} while((e=BZ2_bzCompress(&strm, done ? BZ_FINISH : BZ_RUN)) == BZ_RUN_OK || e == BZ_FINISH_OK || onemore--);
+
+	if(e != BZ_STREAM_END) {
+		fprint(2, "bzip2: compress failed\n");
+		return 0;
+	}
+
+	if(BZ2_bzCompressEnd(&strm) != BZ_OK) {
+		fprint(2, "bzip2: compress end failed (can't happen)\n");
+		return 0;
+	}
+
+	Bterm(&bin);
+
+	return 1;
+}