1/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#include "tensorflow/tsl/platform/protobuf.h"
17
18namespace tsl {
19
20const char* kProtobufInt64Typename = "::tensorflow::protobuf_int64";
21const char* kProtobufUint64Typename = "::tensorflow::protobuf_uint64";
22
23TStringOutputStream::TStringOutputStream(tstring* target) : target_(target) {}
24
25bool TStringOutputStream::Next(void** data, int* size) {
26 size_t old_size = target_->size();
27
28 // Grow the string.
29 if (old_size < target_->capacity()) {
30 // Resize the string to match its capacity, since we can get away
31 // without a memory allocation this way.
32 target_->resize_uninitialized(target_->capacity());
33 } else {
34 // Size has reached capacity, try to double the size.
35 if (old_size > std::numeric_limits<size_t>::max() / 2) {
36 // Can not double the size otherwise it is going to cause integer
37 // overflow in the expression below: old_size * 2 ";
38 return false;
39 }
40 // Double the size, also make sure that the new size is at least
41 // kMinimumSize.
42 target_->resize_uninitialized(std::max(
43 old_size * 2,
44 (size_t)kMinimumSize + 0)); // "+ 0" works around GCC4 weirdness.
45 }
46
47 *data = target_->data() + old_size;
48 *size = target_->size() - old_size;
49 return true;
50}
51
52void TStringOutputStream::BackUp(int count) {
53 target_->resize(target_->size() - count);
54}
55
56int64_t TStringOutputStream::ByteCount() const { return target_->size(); }
57
58} // namespace tsl
59