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70 lines (61 loc) · 2.14 KB
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/*
* Copyright 2017 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
*
* 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 "app/rest/response_binary.h"
#include <memory>
#include <string>
#include "app/rest/zlibwrapper.h"
#include "app/src/log.h"
namespace firebase {
namespace rest {
static size_t kMaxGzipLengthAccepted = 100 * 1024 * 1024; // 100 MB
ResponseBinary::ResponseBinary() : use_gunzip_(false) {
zlib_.SetGzipHeaderMode();
}
void ResponseBinary::GetBody(const char** data, size_t* size) const {
if (!use_gunzip_) {
Response::GetBody(data, size);
return;
}
if (body_gunzip_cache_.empty()) {
const char* body_data;
size_t body_size;
Response::GetBody(&body_data, &body_size);
body_gunzip_cache_ = Gunzip(body_data, body_size);
}
*data = body_gunzip_cache_.data();
*size = body_gunzip_cache_.length();
}
std::string ResponseBinary::Gunzip(const char* input_data,
size_t input_size) const {
uLongf result_length = zlib_.GzipUncompressedLength(
reinterpret_cast<const unsigned char*>(input_data), input_size);
if (result_length > kMaxGzipLengthAccepted) {
LogError("gunzip error, %lu bytes is greater than the maximum allowed",
result_length);
return std::string();
}
std::unique_ptr<char[]> result(new char[result_length]);
int err = zlib_.Uncompress(
reinterpret_cast<unsigned char*>(result.get()), &result_length,
reinterpret_cast<const unsigned char*>(input_data), input_size);
if (err != Z_OK) {
LogError("gunzip error: %d", err);
return std::string();
}
return std::string(result.get(), result_length);
}
} // namespace rest
} // namespace firebase