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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <google/protobuf/stubs/bytestream.h>
#include <string.h>
#include <algorithm>
#include <google/protobuf/stubs/logging.h>
namespace google {
namespace protobuf {
namespace strings {
void ByteSource::CopyTo(ByteSink* sink, size_t n) {
while (n > 0) {
StringPiece fragment = Peek();
if (fragment.empty()) {
GOOGLE_LOG(DFATAL) << "ByteSource::CopyTo() overran input.";
break;
}
std::size_t fragment_size = std::min<std::size_t>(n, fragment.size());
sink->Append(fragment.data(), fragment_size);
Skip(fragment_size);
n -= fragment_size;
}
}
void ByteSink::Flush() {}
void UncheckedArrayByteSink::Append(const char* data, size_t n) {
if (data != dest_) {
// Catch cases where the pointer returned by GetAppendBuffer() was modified.
GOOGLE_DCHECK(!(dest_ <= data && data < (dest_ + n)))
<< "Append() data[] overlaps with dest_[]";
memcpy(dest_, data, n);
}
dest_ += n;
}
CheckedArrayByteSink::CheckedArrayByteSink(char* outbuf, size_t capacity)
: outbuf_(outbuf), capacity_(capacity), size_(0), overflowed_(false) {
}
void CheckedArrayByteSink::Append(const char* bytes, size_t n) {
size_t available = capacity_ - size_;
if (n > available) {
n = available;
overflowed_ = true;
}
if (n > 0 && bytes != (outbuf_ + size_)) {
// Catch cases where the pointer returned by GetAppendBuffer() was modified.
GOOGLE_DCHECK(!(outbuf_ <= bytes && bytes < (outbuf_ + capacity_)))
<< "Append() bytes[] overlaps with outbuf_[]";
memcpy(outbuf_ + size_, bytes, n);
}
size_ += n;
}
GrowingArrayByteSink::GrowingArrayByteSink(size_t estimated_size)
: capacity_(estimated_size),
buf_(new char[estimated_size]),
size_(0) {
}
GrowingArrayByteSink::~GrowingArrayByteSink() {
delete[] buf_; // Just in case the user didn't call GetBuffer.
}
void GrowingArrayByteSink::Append(const char* bytes, size_t n) {
size_t available = capacity_ - size_;
if (bytes != (buf_ + size_)) {
// Catch cases where the pointer returned by GetAppendBuffer() was modified.
// We need to test for this before calling Expand() which may reallocate.
GOOGLE_DCHECK(!(buf_ <= bytes && bytes < (buf_ + capacity_)))
<< "Append() bytes[] overlaps with buf_[]";
}
if (n > available) {
Expand(n - available);
}
if (n > 0 && bytes != (buf_ + size_)) {
memcpy(buf_ + size_, bytes, n);
}
size_ += n;
}
char* GrowingArrayByteSink::GetBuffer(size_t* nbytes) {
ShrinkToFit();
char* b = buf_;
*nbytes = size_;
buf_ = nullptr;
size_ = capacity_ = 0;
return b;
}
void GrowingArrayByteSink::Expand(size_t amount) { // Expand by at least 50%.
size_t new_capacity = std::max(capacity_ + amount, (3 * capacity_) / 2);
char* bigger = new char[new_capacity];
memcpy(bigger, buf_, size_);
delete[] buf_;
buf_ = bigger;
capacity_ = new_capacity;
}
void GrowingArrayByteSink::ShrinkToFit() {
// Shrink only if the buffer is large and size_ is less than 3/4
// of capacity_.
if (capacity_ > 256 && size_ < (3 * capacity_) / 4) {
char* just_enough = new char[size_];
memcpy(just_enough, buf_, size_);
delete[] buf_;
buf_ = just_enough;
capacity_ = size_;
}
}
void StringByteSink::Append(const char* data, size_t n) {
dest_->append(data, n);
}
size_t ArrayByteSource::Available() const {
return input_.size();
}
StringPiece ArrayByteSource::Peek() {
return input_;
}
void ArrayByteSource::Skip(size_t n) {
GOOGLE_DCHECK_LE(n, input_.size());
input_.remove_prefix(n);
}
LimitByteSource::LimitByteSource(ByteSource *source, size_t limit)
: source_(source),
limit_(limit) {
}
size_t LimitByteSource::Available() const {
size_t available = source_->Available();
if (available > limit_) {
available = limit_;
}
return available;
}
StringPiece LimitByteSource::Peek() {
StringPiece piece = source_->Peek();
return StringPiece(piece.data(), std::min(piece.size(), limit_));
}
void LimitByteSource::Skip(size_t n) {
GOOGLE_DCHECK_LE(n, limit_);
source_->Skip(n);
limit_ -= n;
}
void LimitByteSource::CopyTo(ByteSink *sink, size_t n) {
GOOGLE_DCHECK_LE(n, limit_);
source_->CopyTo(sink, n);
limit_ -= n;
}
} // namespace strings
} // namespace protobuf
} // namespace google
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