good good study, day day up!

vendor/gopl.io/ch13/bzip-print/bzip2.c

@@ -0,0 +1,28 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 362.
+// This is the version that appears in print,
+// but it does not comply with the proposed
+// rules for passing pointers between Go and C.
+// (https://github.com/golang/proposal/blob/master/design/12416-cgo-pointers.md)
+// See gopl.io/ch13/bzip for an updated version.
+
+//!+
+/* This file is gopl.io/ch13/bzip/bzip2.c,         */
+/* a simple wrapper for libbzip2 suitable for cgo. */
+#include <bzlib.h>
+
+int bz2compress(bz_stream *s, int action,
+                char *in, unsigned *inlen, char *out, unsigned *outlen) {
+  s->next_in = in;
+  s->avail_in = *inlen;
+  s->next_out = out;
+  s->avail_out = *outlen;
+  int r = BZ2_bzCompress(s, action);
+  *inlen -= s->avail_in;
+  *outlen -= s->avail_out;
+  return r;
+}
+
+//!-