Promote the old installer/livecd specific tools to normal tools under /sys/src/cmd. Where similar common tools already existed, I kept them.

1 files changed, 109 insertions, 0 deletions

diff --git a/sys/src/cmd/aux/unbflz.c b/sys/src/cmd/aux/unbflz.c
new file mode 100644
index 000000000..5ddb821f9
--- /dev/null
+++ b/sys/src/cmd/aux/unbflz.c
@@ -0,0 +1,109 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+
+void
+usage(void)
+{
+	fprint(2, "usage: unbflz [file]\n");
+	exits("usage");
+}
+
+int
+Bgetint(Biobuf *b)
+{
+	uchar p[4];
+
+	if(Bread(b, p, 4) != 4)
+		sysfatal("short read");
+	return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
+}
+
+/*
+ * memmove but make sure overlap works properly.
+ */
+void
+copy(uchar *dst, uchar *src, int n)
+{
+	while(n-- > 0)
+		*dst++ = *src++;
+}
+
+void
+main(int argc, char **argv)
+{
+	Biobuf *b, bin;
+	char buf[5];
+	uchar *data;
+	ulong *blk, l;
+	int nblk, mblk;
+	int sum;
+	int i, j, length, m, n, o;
+
+	ARGBEGIN{
+	default:
+		usage();
+	}ARGEND
+
+	switch(argc){
+	default:
+		usage();
+	case 0:
+		Binit(&bin, 0, OREAD);
+		b = &bin;
+		break;
+	case 1:
+		if((b = Bopen(argv[0], OREAD)) == nil)
+			sysfatal("open %s: %r", argv[0]);
+		break;
+	}
+
+	if(Bread(b, buf, 4) != 4)
+		sysfatal("short read");
+
+	if(memcmp(buf, "BLZ\n", 4) != 0)
+		sysfatal("bad header");
+
+	length = Bgetint(b);
+	data = malloc(length);
+	if(data == nil)
+		sysfatal("out of memory");
+	sum = 0;
+	nblk = 0;
+	mblk = 0;
+	blk = nil;
+	while(sum < length){
+		if(nblk>=mblk){
+			mblk += 16384;
+			blk = realloc(blk, (mblk+1)*sizeof(blk[0]));
+			if(blk == nil)
+				sysfatal("out of memory");
+		}
+		l = Bgetint(b);
+		blk[nblk++] = l;
+		if(l&(1<<31))
+			l &= ~(1<<31);
+		else
+			blk[nblk++] = Bgetint(b);
+		sum += l;
+	}
+	if(sum != length)
+		sysfatal("bad compressed data %d %d", sum, length);
+	i = 0;
+	j = 0;
+	while(i < length){
+		assert(j < nblk);
+		n = blk[j++];
+		if(n&(1<<31)){
+			n &= ~(1<<31);
+			if((m=Bread(b, data+i, n)) != n)
+				sysfatal("short read %d %d", n, m);
+		}else{
+			o = blk[j++];
+			copy(data+i, data+o, n);
+		}
+		i += n;
+	}
+	write(1, data, length);
+	exits(nil);
+}