1 files changed, 60 insertions, 0 deletions
diff --git a/wrapper.c b/wrapper.c
index 93562f03ee..c85ca52ec6 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -196,3 +196,63 @@ int xmkstemp(char *template)
 		die("Unable to create temporary file: %s", strerror(errno));
 	return fd;
 }
+
+/*
+ * zlib wrappers to make sure we don't silently miss errors
+ * at init time.
+ */
+void git_inflate_init(z_streamp strm)
+{
+	const char *err;
+
+	switch (inflateInit(strm)) {
+	case Z_OK:
+		return;
+
+	case Z_MEM_ERROR:
+		err = "out of memory";
+		break;
+	case Z_VERSION_ERROR:
+		err = "wrong version";
+		break;
+	default:
+		err = "error";
+	}
+	die("inflateInit: %s (%s)", err, strm->msg ? strm->msg : "no message");
+}
+
+void git_inflate_end(z_streamp strm)
+{
+	if (inflateEnd(strm) != Z_OK)
+		error("inflateEnd: %s", strm->msg ? strm->msg : "failed");
+}
+
+int git_inflate(z_streamp strm, int flush)
+{
+	int ret = inflate(strm, flush);
+	const char *err;
+
+	switch (ret) {
+	/* Out of memory is fatal. */
+	case Z_MEM_ERROR:
+		die("inflate: out of memory");
+
+	/* Data corruption errors: we may want to recover from them (fsck) */
+	case Z_NEED_DICT:
+		err = "needs dictionary"; break;
+	case Z_DATA_ERROR:
+		err = "data stream error"; break;
+	case Z_STREAM_ERROR:
+		err = "stream consistency error"; break;
+	default:
+		err = "unknown error"; break;
+
+	/* Z_BUF_ERROR: normal, needs more space in the output buffer */
+	case Z_BUF_ERROR:
+	case Z_OK:
+	case Z_STREAM_END:
+		return ret;
+	}
+	error("inflate: %s (%s)", err, strm->msg ? strm->msg : "no message");
+	return ret;
+}