blob: 389baf34c202337f03b7f005afbebdaeea4e61bc [file] [log] [blame]
// Copyright 2019 Google LLC
//
// 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
//
// https://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.
// -----------------------------------------------------------------------------
//
// Writer implementations
//
// Author: Skal (pascal.massimino@gmail.com)
#include <algorithm>
#include <cassert>
#include <cstring> // for memcpy()
#include <string>
#include "src/utils/utils.h"
#include "src/wp2/encode.h"
namespace WP2 {
//------------------------------------------------------------------------------
bool MemoryWriter::Reserve(size_t size) {
const uint64_t next_size = (uint64_t)size_ + size;
if (next_size <= max_size_) return true;
const uint64_t kMinSize = 8192u;
const uint64_t next_max_size =
std::max({kMinSize, 2u * (uint64_t)max_size_, next_size});
uint8_t* const new_mem = (uint8_t*)WP2Malloc(next_max_size, 1);
if (new_mem == nullptr) return false;
if (size_ > 0) memcpy(new_mem, mem_, size_);
WP2Free(mem_);
mem_ = new_mem;
// down-cast is ok, thanks to WP2Malloc
max_size_ = (size_t)next_max_size;
return true;
}
bool MemoryWriter::Append(const void* data, size_t data_size) {
if (data_size > 0) {
if (!Reserve(data_size)) return false;
memcpy(mem_ + size_, data, data_size);
size_ += data_size;
}
return true;
}
void MemoryWriter::Reset() {
WP2Free(mem_);
mem_ = nullptr;
size_ = 0;
max_size_ = 0;
}
//------------------------------------------------------------------------------
bool StringWriter::Reserve(size_t size) {
if (str_ == nullptr) {
return false;
}
str_->reserve(str_->size() + size);
return true;
}
bool StringWriter::Append(const void* data, size_t data_size) {
if (str_ == nullptr) {
return false;
}
if (data_size > 0) {
str_->append((const char*)data, data_size);
}
return true;
}
//------------------------------------------------------------------------------
bool DataWriter::Reserve(size_t size) {
return (data_ != nullptr &&
(size_ + size <= data_->size ||
data_->Resize(size_ + size, /*keep_bytes=*/true) == WP2_STATUS_OK));
}
bool DataWriter::Append(const void* data, size_t data_size) {
if (data_ == nullptr || !Reserve(data_size)) {
return false;
}
std::copy((const uint8_t*)data, (const uint8_t*)data + data_size,
data_->bytes + size_);
size_ += data_size;
return true;
}
//------------------------------------------------------------------------------
bool Counter::Append(const void* data, size_t data_size) {
(void)data;
size_ += data_size;
return true;
}
//------------------------------------------------------------------------------
} // namespace WP2