mirror of
https://github.com/google/sandboxed-api.git
synced 2024-03-22 13:11:30 +08:00
125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "contrib/brotli/utils/utils_brotli_dec.h"
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#include <fstream>
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#include <string>
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#include "contrib/brotli/sandboxed.h"
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#include "contrib/brotli/utils/utils_brotli.h"
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absl::Status BrotliDecoder::InitStructs() {
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SAPI_ASSIGN_OR_RETURN(
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BrotliDecoderState * state,
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api_.BrotliDecoderCreateInstance(&null_ptr_, &null_ptr_, &null_ptr_));
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state_.SetRemote(state);
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return absl::OkStatus();
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}
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BrotliDecoder::~BrotliDecoder() {
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if (state_.GetRemote() != nullptr) {
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api_.BrotliDecoderDestroyInstance(state_.PtrNone()).IgnoreError();
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}
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}
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bool BrotliDecoder::IsInit() {
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if (state_.GetRemote() == nullptr) {
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return false;
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}
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return true;
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}
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absl::Status BrotliDecoder::CheckIsInit() {
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if (!IsInit()) {
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return absl::UnavailableError("The decoder is not initialized");
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}
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return absl::OkStatus();
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}
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absl::Status BrotliDecoder::SetParameter(enum BrotliDecoderParameter param,
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uint32_t value) {
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SAPI_RETURN_IF_ERROR(CheckIsInit());
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SAPI_ASSIGN_OR_RETURN(
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int ret, api_.BrotliDecoderSetParameter(state_.PtrNone(), param, value));
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if (!ret) {
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return absl::UnavailableError("Unable to set parameter");
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}
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return absl::OkStatus();
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}
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absl::StatusOr<BrotliDecoderResult> BrotliDecoder::Decompress(
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std::vector<uint8_t>& buf_in) {
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SAPI_RETURN_IF_ERROR(CheckIsInit());
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sapi::v::Array<uint8_t> sapi_buf_in(buf_in.data(), buf_in.size());
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sapi::v::IntBase<size_t> sapi_size_in(buf_in.size());
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// BrotliDecoderCompress requires a pointer to a pointer,
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// as function moves to pointer to indicate how much data
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// was compressed.
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// In this case we compress whole buffer so we don't use it
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// but we still have to allocate buffer remotely and gets
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// a pointer.
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SAPI_RETURN_IF_ERROR(sandbox_->Allocate(&sapi_buf_in));
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SAPI_RETURN_IF_ERROR(sandbox_->TransferToSandboxee(&sapi_buf_in));
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sapi::v::GenericPtr sapi_opaque_buf_in(sapi_buf_in.GetRemote());
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sapi::v::IntBase<size_t> sapi_avilable_out(0);
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SAPI_ASSIGN_OR_RETURN(
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BrotliDecoderResult ret,
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api_.BrotliDecoderDecompressStream(
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state_.PtrNone(), sapi_size_in.PtrBefore(),
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sapi_opaque_buf_in.PtrBefore(), sapi_avilable_out.PtrBefore(),
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&null_ptr_, &null_ptr_));
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// Ignore output error, as we didn't provide any buffer.
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if (ret == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT) {
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ret = BROTLI_DECODER_RESULT_SUCCESS;
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}
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return ret;
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}
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absl::StatusOr<std::vector<uint8_t>> BrotliDecoder::TakeOutput() {
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SAPI_RETURN_IF_ERROR(CheckIsInit());
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sapi::v::IntBase<size_t> sapi_size_out(0);
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SAPI_ASSIGN_OR_RETURN(
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uint8_t * sapi_out_buf_ptr,
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api_.BrotliDecoderTakeOutput(state_.PtrNone(), sapi_size_out.PtrAfter()));
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if (sapi_out_buf_ptr == nullptr || sapi_size_out.GetValue() == 0) {
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return std::vector<uint8_t>(0);
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}
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if (sapi_size_out.GetValue() > kFileMaxSize) {
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return absl::UnavailableError("Output to large");
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}
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std::vector<uint8_t> buf_out(sapi_size_out.GetValue());
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sapi::v::Array<uint8_t> sapi_buf_out(buf_out.data(), buf_out.size());
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sapi_buf_out.SetRemote(sapi_out_buf_ptr);
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SAPI_RETURN_IF_ERROR(sandbox_->TransferFromSandboxee(&sapi_buf_out));
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return buf_out;
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}
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