1 files changed, 55 insertions, 0 deletions
diff --git a/test/core/util/parse_hexstring.cc b/test/core/util/parse_hexstring.cc
new file mode 100644
index 0000000000..6dee0f163a
--- /dev/null
+++ b/test/core/util/parse_hexstring.cc
@@ -0,0 +1,55 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "test/core/util/parse_hexstring.h"
+#include <grpc/support/log.h>
+
+grpc_slice parse_hexstring(const char* hexstring) {
+  size_t nibbles = 0;
+  const char* p = 0;
+  uint8_t* out;
+  uint8_t temp;
+  grpc_slice slice;
+
+  for (p = hexstring; *p; p++) {
+    nibbles += (*p >= '0' && *p <= '9') || (*p >= 'a' && *p <= 'f');
+  }
+
+  GPR_ASSERT((nibbles & 1) == 0);
+
+  slice = grpc_slice_malloc(nibbles / 2);
+  out = GRPC_SLICE_START_PTR(slice);
+
+  nibbles = 0;
+  temp = 0;
+  for (p = hexstring; *p; p++) {
+    if (*p >= '0' && *p <= '9') {
+      temp = (uint8_t)(temp << 4) | (uint8_t)(*p - '0');
+      nibbles++;
+    } else if (*p >= 'a' && *p <= 'f') {
+      temp = (uint8_t)(temp << 4) | (uint8_t)(*p - 'a' + 10);
+      nibbles++;
+    }
+    if (nibbles == 2) {
+      *out++ = temp;
+      nibbles = 0;
+    }
+  }
+
+  return slice;
+}