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authorGravatar misterg <misterg@google.com>2017-09-19 16:54:40 -0400
committerGravatar misterg <misterg@google.com>2017-09-19 16:54:40 -0400
commitc2e754829628d1e9b7a16b3389cfdace76950fdf (patch)
tree5a7f056f44e27c30e10025113b644f0b3b5801fc /absl/strings/internal/utf8.cc
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+// Copyright 2017 The Abseil 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.
+
+// UTF8 utilities, implemented to reduce dependencies.
+
+#include "absl/strings/internal/utf8.h"
+
+namespace absl {
+namespace strings_internal {
+
+size_t EncodeUTF8Char(char *buffer, char32_t utf8_char) {
+ if (utf8_char <= 0x7F) {
+ *buffer = static_cast<char>(utf8_char);
+ return 1;
+ } else if (utf8_char <= 0x7FF) {
+ buffer[1] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[0] = 0xC0 | utf8_char;
+ return 2;
+ } else if (utf8_char <= 0xFFFF) {
+ buffer[2] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[1] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[0] = 0xE0 | utf8_char;
+ return 3;
+ } else {
+ buffer[3] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[2] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[1] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[0] = 0xF0 | utf8_char;
+ return 4;
+ }
+}
+
+} // namespace strings_internal
+} // namespace absl