--- /dev/null
+/*
+ *
+ * Copyright 2016 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 <grpc/support/port_platform.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
+
+#include "src/core/lib/gprpp/memory.h"
+#include "src/core/lib/iomgr/error.h"
+#include "src/core/lib/slice/slice_internal.h"
+#include "src/core/lib/slice/slice_string_helpers.h"
+#include "src/core/lib/surface/validate_metadata.h"
+
+static grpc_error* conforms_to(const grpc_slice& slice,
+ const uint8_t* legal_bits,
+ const char* err_desc) {
+ const uint8_t* p = GRPC_SLICE_START_PTR(slice);
+ const uint8_t* e = GRPC_SLICE_END_PTR(slice);
+ for (; p != e; p++) {
+ int idx = *p;
+ int byte = idx / 8;
+ int bit = idx % 8;
+ if ((legal_bits[byte] & (1 << bit)) == 0) {
+ grpc_error* error = grpc_error_set_str(
+ grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(err_desc),
+ GRPC_ERROR_INT_OFFSET,
+ p - GRPC_SLICE_START_PTR(slice)),
+ GRPC_ERROR_STR_RAW_BYTES,
+ grpc_dump_slice_to_slice(slice, GPR_DUMP_HEX | GPR_DUMP_ASCII));
+ return error;
+ }
+ }
+ return GRPC_ERROR_NONE;
+}
+
+static int error2int(grpc_error* error) {
+ int r = (error == GRPC_ERROR_NONE);
+ GRPC_ERROR_UNREF(error);
+ return r;
+}
+
+grpc_error* grpc_validate_header_key_is_legal(const grpc_slice& slice) {
+ static const uint8_t legal_header_bits[256 / 8] = {
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0xff, 0x03, 0x00, 0x00, 0x00,
+ 0x80, 0xfe, 0xff, 0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+ if (GRPC_SLICE_LENGTH(slice) == 0) {
+ return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+ "Metadata keys cannot be zero length");
+ }
+ if (GRPC_SLICE_LENGTH(slice) > UINT32_MAX) {
+ return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+ "Metadata keys cannot be larger than UINT32_MAX");
+ }
+ if (GRPC_SLICE_START_PTR(slice)[0] == ':') {
+ return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+ "Metadata keys cannot start with :");
+ }
+ return conforms_to(slice, legal_header_bits, "Illegal header key");
+}
+
+int grpc_header_key_is_legal(grpc_slice slice) {
+ return error2int(grpc_validate_header_key_is_legal(slice));
+}
+
+grpc_error* grpc_validate_header_nonbin_value_is_legal(
+ const grpc_slice& slice) {
+ static const uint8_t legal_header_bits[256 / 8] = {
+ 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+ return conforms_to(slice, legal_header_bits, "Illegal header value");
+}
+
+int grpc_header_nonbin_value_is_legal(grpc_slice slice) {
+ return error2int(grpc_validate_header_nonbin_value_is_legal(slice));
+}
+
+int grpc_is_binary_header_internal(const grpc_slice& slice) {
+ return grpc_key_is_binary_header(GRPC_SLICE_START_PTR(slice),
+ GRPC_SLICE_LENGTH(slice));
+}
+
+int grpc_is_binary_header(grpc_slice slice) {
+ return grpc_is_binary_header_internal(slice);
+}