mirror of
https://github.com/google/sandboxed-api.git
synced 2024-03-22 13:11:30 +08:00
241 lines
8.3 KiB
C++
241 lines
8.3 KiB
C++
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// 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 <fstream>
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#include <iostream>
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#include <string>
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#include "../sandboxed.h"
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static const size_t kFileMaxSize = 1024 * 1024 * 1024; // 1GB
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std::streamsize GetStreamSize(std::ifstream& stream) {
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stream.seekg(0, std::ios_base::end);
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std::streamsize ssize = stream.tellg();
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stream.seekg(0, std::ios_base::beg);
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return ssize;
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}
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absl::Status CompressInMemory(ZstdApi& api, std::ifstream& instream,
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std::ofstream& outstream, int level) {
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std::streamsize ssize = GetStreamSize(instream);
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sapi::v::Array<uint8_t> inbuf(ssize);
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instream.read(reinterpret_cast<char*>(inbuf.GetData()), ssize);
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if (instream.gcount() != ssize) {
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return absl::UnavailableError("Unable to read file");
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}
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SAPI_ASSIGN_OR_RETURN(size_t size, api.ZSTD_compressBound(inbuf.GetSize()));
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sapi::v::Array<uint8_t> outbuf(size);
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SAPI_ASSIGN_OR_RETURN(
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size_t outsize,
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api.ZSTD_compress(outbuf.PtrAfter(), size, inbuf.PtrBefore(),
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inbuf.GetSize(), level));
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SAPI_ASSIGN_OR_RETURN(int iserr, api.ZSTD_isError(outsize))
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if (iserr) {
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return absl::UnavailableError("Unable to compress file");
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}
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outstream.write(reinterpret_cast<char*>(outbuf.GetData()), outsize);
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if (!outstream.good()) {
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return absl::UnavailableError("Unable to write file");
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}
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return absl::OkStatus();
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}
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absl::Status DecompressInMemory(ZstdApi& api, std::ifstream& instream,
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std::ofstream& outstream) {
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int iserr;
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std::streamsize ssize = GetStreamSize(instream);
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sapi::v::Array<uint8_t> inbuf(ssize);
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instream.read(reinterpret_cast<char*>(inbuf.GetData()), ssize);
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if (instream.gcount() != ssize) {
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return absl::UnavailableError("Unable to read file");
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}
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SAPI_ASSIGN_OR_RETURN(size_t size, api.ZSTD_getFrameContentSize(
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inbuf.PtrBefore(), inbuf.GetSize()));
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if (size > kFileMaxSize) {
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return absl::UnavailableError("File to large");
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}
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SAPI_ASSIGN_OR_RETURN(iserr, api.ZSTD_isError(size));
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if (iserr) {
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return absl::UnavailableError("Unable to decompress file");
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}
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sapi::v::Array<uint8_t> outbuf(size);
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SAPI_ASSIGN_OR_RETURN(
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size_t desize, api.ZSTD_decompress(outbuf.PtrAfter(), size,
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inbuf.PtrBefore(), inbuf.GetSize()));
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SAPI_ASSIGN_OR_RETURN(iserr, api.ZSTD_isError(desize));
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if (iserr) {
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return absl::UnavailableError("Unable to decompress file");
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}
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outstream.write(reinterpret_cast<char*>(outbuf.GetData()), desize);
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if (!outstream.good()) {
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return absl::UnavailableError("Unable to write file");
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}
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return absl::OkStatus();
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}
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absl::Status CompressStream(ZstdApi& api, std::ifstream& instream,
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std::ofstream& outstream, int level) {
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int iserr;
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// Create necessary buffers.
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SAPI_ASSIGN_OR_RETURN(size_t inbuf_size, api.ZSTD_CStreamInSize());
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SAPI_ASSIGN_OR_RETURN(size_t outbuf_size, api.ZSTD_CStreamOutSize());
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sapi::v::Array<uint8_t> inbuf(inbuf_size);
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sapi::v::Array<uint8_t> outbuf(outbuf_size);
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if (!api.GetSandbox()->Allocate(&inbuf).ok() ||
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!api.GetSandbox()->Allocate(&outbuf).ok()) {
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return absl::UnavailableError("Unable to allocate buffors");
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}
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// Create Zstd context.
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SAPI_ASSIGN_OR_RETURN(ZSTD_DCtx * dctx, api.ZSTD_createDCtx());
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sapi::v::RemotePtr rdctx(dctx);
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SAPI_ASSIGN_OR_RETURN(iserr, api.ZSTD_CCtx_setParameter(
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&rdctx, ZSTD_c_compressionLevel, level));
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if (!iserr) {
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return absl::UnavailableError("Unable to set parameter");
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}
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SAPI_ASSIGN_OR_RETURN(
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iserr, api.ZSTD_CCtx_setParameter(&rdctx, ZSTD_c_checksumFlag, 1));
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if (!iserr) {
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return absl::UnavailableError("Unable to set parameter");
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}
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// Compress.
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while (instream) {
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instream.read(reinterpret_cast<char*>(inbuf.GetData()), inbuf_size);
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if (!api.GetSandbox()->TransferToSandboxee(&inbuf).ok()) {
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return absl::UnavailableError("Unable to transfer data");
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}
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sapi::v::Struct<ZSTD_inBuffer_s> struct_in;
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struct_in.mutable_data()->src = static_cast<uint8_t*>(inbuf.GetRemote());
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struct_in.mutable_data()->pos = 0;
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struct_in.mutable_data()->size = instream.gcount();
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ZSTD_EndDirective mode = ZSTD_e_continue;
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if (instream.gcount() < inbuf_size) {
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mode = ZSTD_e_end;
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}
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bool isdone = false;
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while (!isdone) {
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sapi::v::Struct<ZSTD_outBuffer_s> struct_out;
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struct_out.mutable_data()->dst = static_cast<uint8_t*>(outbuf.GetRemote());
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struct_out.mutable_data()->pos = 0;
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struct_out.mutable_data()->size = outbuf.GetSize();
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SAPI_ASSIGN_OR_RETURN(size_t remaining, api.ZSTD_compressStream2(
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&rdctx, struct_out.PtrBoth(),
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struct_in.PtrBoth(), mode));
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SAPI_ASSIGN_OR_RETURN(int iserr, api.ZSTD_isError(remaining))
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if (iserr) {
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return absl::UnavailableError("Unable to decompress file");
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}
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if (!api.GetSandbox()->TransferFromSandboxee(&outbuf).ok()) {
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return absl::UnavailableError("Unable to transfer data from");
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}
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outstream.write(reinterpret_cast<char*>(outbuf.GetData()),
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struct_out.mutable_data()->pos);
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if (!outstream.good()) {
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return absl::UnavailableError("Unable to write file");
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}
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if (mode == ZSTD_e_continue) {
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isdone = (struct_in.mutable_data()->pos == instream.gcount());
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} else {
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isdone = (remaining == 0);
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}
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}
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}
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api.ZSTD_freeDCtx(&rdctx).IgnoreError();
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return absl::OkStatus();
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}
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absl::Status DecompressStream(ZstdApi& api, std::ifstream& instream,
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std::ofstream& outstream) {
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// Create necessary buffers.
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SAPI_ASSIGN_OR_RETURN(size_t inbuf_size, api.ZSTD_CStreamInSize());
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SAPI_ASSIGN_OR_RETURN(size_t outbuf_size, api.ZSTD_CStreamOutSize());
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sapi::v::Array<uint8_t> inbuf(inbuf_size);
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sapi::v::Array<uint8_t> outbuf(outbuf_size);
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if (!api.GetSandbox()->Allocate(&inbuf).ok() ||
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!api.GetSandbox()->Allocate(&outbuf).ok()) {
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return absl::UnavailableError("Unable to allocate buffors");
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}
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// Create Zstd context.
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SAPI_ASSIGN_OR_RETURN(ZSTD_DCtx * dctx, api.ZSTD_createDCtx());
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sapi::v::RemotePtr rdctx(dctx);
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// Decompress.
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while (instream) {
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instream.read(reinterpret_cast<char*>(inbuf.GetData()), inbuf_size);
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if (!api.GetSandbox()->TransferToSandboxee(&inbuf).ok()) {
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return absl::UnavailableError("Unable to transfer data");
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}
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sapi::v::Struct<ZSTD_inBuffer_s> struct_in;
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*struct_in.mutable_data() = {static_cast<uint8_t*>(inbuf.GetRemote()),
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(size_t)instream.gcount(), 0};
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bool isdone = false;
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while (struct_in.mutable_data()->pos < instream.gcount()) {
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sapi::v::Struct<ZSTD_outBuffer_s> struct_out;
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*struct_out.mutable_data() = {static_cast<uint8_t*>(outbuf.GetRemote()),
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(size_t)outbuf.GetSize(), 0};
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SAPI_ASSIGN_OR_RETURN(
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size_t ret, api.ZSTD_decompressStream(&rdctx, struct_out.PtrBoth(),
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struct_in.PtrBoth()));
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SAPI_ASSIGN_OR_RETURN(int iserr, api.ZSTD_isError(ret))
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if (iserr) {
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return absl::UnavailableError("Unable to decompress file");
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}
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if (!api.GetSandbox()->TransferFromSandboxee(&outbuf).ok()) {
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return absl::UnavailableError("Unable to transfer data from");
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}
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outstream.write(reinterpret_cast<char*>(outbuf.GetData()),
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struct_out.mutable_data()->pos);
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if (!outstream.good()) {
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return absl::UnavailableError("Unable to write file");
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}
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}
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}
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api.ZSTD_freeDCtx(&rdctx).IgnoreError();
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return absl::OkStatus();
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}
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