livecd

1 files changed, 108 insertions, 0 deletions

diff --git a/sys/lib/dist.old/cmd/bzfs/unbflz.c b/sys/lib/dist.old/cmd/bzfs/unbflz.c
new file mode 100644
index 000000000..661d65e4d
--- /dev/null
+++ b/sys/lib/dist.old/cmd/bzfs/unbflz.c
@@ -0,0 +1,108 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include "bzfs.h"
+
+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++;
+}
+
+int
+unbflz(int in)
+{
+	int rv, out, p[2];
+	Biobuf *b, bin;
+	char buf[5];
+	uchar *data;
+	int i, j, length, n, m, o, sum;
+	ulong *blk;
+	int nblk, mblk;
+
+	if(pipe(p) < 0)
+		sysfatal("pipe: %r");
+
+	rv = p[0];
+	out = p[1];
+	switch(rfork(RFPROC|RFFDG|RFNOTEG|RFMEM)){
+	case -1:
+		sysfatal("fork: %r");
+	case 0:
+		close(rv);
+		break;
+	default:
+		close(in);
+		close(out);
+		return rv;
+	}
+
+	Binit(&bin, in, OREAD);
+	b = &bin;
+
+	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");
+		}
+		n = Bgetint(b);
+		blk[nblk++] = n;
+		if(n&(1<<31))
+			n &= ~(1<<31);
+		else
+			blk[nblk++] = Bgetint(b);
+		sum += n;
+	}
+	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(out, data, length);
+	close(in);
+	close(out);
+	_exits(0);
+	return -1;
+}