add libflate
diff --git a/src/libflate/inflateblock.c b/src/libflate/inflateblock.c
new file mode 100644
index 0000000..77077b6
--- /dev/null
+++ b/src/libflate/inflateblock.c
@@ -0,0 +1,54 @@
+#include <u.h>
+#include <libc.h>
+#include <flate.h>
+
+typedef struct Block Block;
+
+struct Block
+{
+ uchar *pos;
+ uchar *limit;
+};
+
+static int
+blgetc(void *vb)
+{
+ Block *b;
+
+ b = vb;
+ if(b->pos >= b->limit)
+ return -1;
+ return *b->pos++;
+}
+
+static int
+blwrite(void *vb, void *buf, int n)
+{
+ Block *b;
+
+ b = vb;
+
+ if(n > b->limit - b->pos)
+ n = b->limit - b->pos;
+ memmove(b->pos, buf, n);
+ b->pos += n;
+ return n;
+}
+
+int
+inflateblock(uchar *dst, int dsize, uchar *src, int ssize)
+{
+ Block bd, bs;
+ int ok;
+
+ bs.pos = src;
+ bs.limit = src + ssize;
+
+ bd.pos = dst;
+ bd.limit = dst + dsize;
+
+ ok = inflate(&bd, blwrite, &bs, blgetc);
+ if(ok != FlateOk)
+ return ok;
+ return bd.pos - dst;
+}
