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283 lines
8.3 KiB
283 lines
8.3 KiB
/*
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* Copyright (C) 2008 The Android Open Source Project
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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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* http://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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*/
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#include "zip_archive.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <vector>
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#include "android-base/stringprintf.h"
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#include "ziparchive/zip_archive.h"
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#include "base/mman.h"
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#include "bit_utils.h"
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#include "unix_file/fd_file.h"
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namespace art {
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// Log file contents and mmap info when mapping entries directly.
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static constexpr const bool kDebugZipMapDirectly = false;
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using android::base::StringPrintf;
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uint32_t ZipEntry::GetUncompressedLength() {
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return zip_entry_->uncompressed_length;
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}
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uint32_t ZipEntry::GetCrc32() {
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return zip_entry_->crc32;
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}
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bool ZipEntry::IsUncompressed() {
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return zip_entry_->method == kCompressStored;
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}
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bool ZipEntry::IsAlignedTo(size_t alignment) const {
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DCHECK(IsPowerOfTwo(alignment)) << alignment;
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return IsAlignedParam(zip_entry_->offset, static_cast<int>(alignment));
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}
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ZipEntry::~ZipEntry() {
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delete zip_entry_;
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}
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bool ZipEntry::ExtractToFile(File& file, std::string* error_msg) {
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const int32_t error = ExtractEntryToFile(handle_, zip_entry_, file.Fd());
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if (error != 0) {
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*error_msg = std::string(ErrorCodeString(error));
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return false;
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}
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return true;
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}
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MemMap ZipEntry::ExtractToMemMap(const char* zip_filename,
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const char* entry_filename,
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std::string* error_msg) {
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std::string name(entry_filename);
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name += " extracted in memory from ";
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name += zip_filename;
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MemMap map = MemMap::MapAnonymous(name.c_str(),
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GetUncompressedLength(),
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PROT_READ | PROT_WRITE,
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/*low_4gb=*/ false,
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error_msg);
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if (!map.IsValid()) {
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DCHECK(!error_msg->empty());
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return MemMap::Invalid();
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}
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DCHECK_EQ(map.Size(), GetUncompressedLength());
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if (!ExtractToMemory(map.Begin(), error_msg)) {
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return MemMap::Invalid();
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}
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return map;
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}
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bool ZipEntry::ExtractToMemory(/*out*/uint8_t* buffer, /*out*/std::string* error_msg) {
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const int32_t error = ::ExtractToMemory(handle_, zip_entry_, buffer, GetUncompressedLength());
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if (error != 0) {
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*error_msg = std::string(ErrorCodeString(error));
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return false;
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}
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return true;
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}
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MemMap ZipEntry::MapDirectlyFromFile(const char* zip_filename, std::string* error_msg) {
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const int zip_fd = GetFileDescriptor(handle_);
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const char* entry_filename = entry_name_.c_str();
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// Should not happen since we don't have a memory ZipArchive constructor.
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// However the underlying ZipArchive isn't required to have an FD,
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// so check to be sure.
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CHECK_GE(zip_fd, 0) <<
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StringPrintf("Cannot map '%s' (in zip '%s') directly because the zip archive "
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"is not file backed.",
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entry_filename,
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zip_filename);
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if (!IsUncompressed()) {
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*error_msg = StringPrintf("Cannot map '%s' (in zip '%s') directly because it is compressed.",
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entry_filename,
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zip_filename);
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return MemMap::Invalid();
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} else if (zip_entry_->uncompressed_length != zip_entry_->compressed_length) {
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*error_msg = StringPrintf("Cannot map '%s' (in zip '%s') directly because "
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"entry has bad size (%u != %u).",
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entry_filename,
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zip_filename,
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zip_entry_->uncompressed_length,
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zip_entry_->compressed_length);
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return MemMap::Invalid();
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}
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std::string name(entry_filename);
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name += " mapped directly in memory from ";
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name += zip_filename;
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const off_t offset = zip_entry_->offset;
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if (kDebugZipMapDirectly) {
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LOG(INFO) << "zip_archive: " << "make mmap of " << name << " @ offset = " << offset;
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}
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MemMap map =
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MemMap::MapFile(GetUncompressedLength(), // Byte count
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE,
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zip_fd,
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offset,
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/*low_4gb=*/ false,
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name.c_str(),
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error_msg);
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if (!map.IsValid()) {
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DCHECK(!error_msg->empty());
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}
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if (kDebugZipMapDirectly) {
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// Dump contents of file, same format as using this shell command:
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// $> od -j <offset> -t x1 <zip_filename>
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static constexpr const int kMaxDumpChars = 15;
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lseek(zip_fd, 0, SEEK_SET);
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int count = offset + kMaxDumpChars;
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std::string tmp;
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char buf;
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// Dump file contents.
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int i = 0;
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while (read(zip_fd, &buf, 1) > 0 && i < count) {
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tmp += StringPrintf("%3d ", (unsigned int)buf);
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++i;
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}
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LOG(INFO) << "map_fd raw bytes starting at 0";
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LOG(INFO) << "" << tmp;
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LOG(INFO) << "---------------------------";
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// Dump map contents.
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if (map.IsValid()) {
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tmp = "";
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count = kMaxDumpChars;
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uint8_t* begin = map.Begin();
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for (i = 0; i < count; ++i) {
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tmp += StringPrintf("%3d ", (unsigned int)begin[i]);
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}
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LOG(INFO) << "map address " << StringPrintf("%p", begin);
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LOG(INFO) << "map first " << kMaxDumpChars << " chars:";
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LOG(INFO) << tmp;
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}
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}
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return map;
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}
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MemMap ZipEntry::MapDirectlyOrExtract(const char* zip_filename,
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const char* entry_filename,
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std::string* error_msg,
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size_t alignment) {
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if (IsUncompressed() && IsAlignedTo(alignment) && GetFileDescriptor(handle_) >= 0) {
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std::string local_error_msg;
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MemMap ret = MapDirectlyFromFile(zip_filename, &local_error_msg);
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if (ret.IsValid()) {
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return ret;
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}
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// Fall back to extraction for the failure case.
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}
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return ExtractToMemMap(zip_filename, entry_filename, error_msg);
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}
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static void SetCloseOnExec(int fd) {
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#ifdef _WIN32
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// Exec is not supported on Windows.
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UNUSED(fd);
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PLOG(ERROR) << "SetCloseOnExec is not supported on Windows.";
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#else
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// This dance is more portable than Linux's O_CLOEXEC open(2) flag.
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int flags = fcntl(fd, F_GETFD);
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if (flags == -1) {
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PLOG(WARNING) << "fcntl(" << fd << ", F_GETFD) failed";
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return;
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}
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int rc = fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
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if (rc == -1) {
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PLOG(WARNING) << "fcntl(" << fd << ", F_SETFD, " << flags << ") failed";
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return;
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}
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#endif
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}
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ZipArchive* ZipArchive::Open(const char* filename, std::string* error_msg) {
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DCHECK(filename != nullptr);
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ZipArchiveHandle handle;
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const int32_t error = OpenArchive(filename, &handle);
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if (error != 0) {
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*error_msg = std::string(ErrorCodeString(error));
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CloseArchive(handle);
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return nullptr;
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}
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SetCloseOnExec(GetFileDescriptor(handle));
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return new ZipArchive(handle);
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}
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ZipArchive* ZipArchive::OpenFromFd(int fd, const char* filename, std::string* error_msg) {
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DCHECK(filename != nullptr);
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DCHECK_GT(fd, 0);
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ZipArchiveHandle handle;
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const int32_t error = OpenArchiveFd(fd, filename, &handle);
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if (error != 0) {
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*error_msg = std::string(ErrorCodeString(error));
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CloseArchive(handle);
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return nullptr;
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}
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SetCloseOnExec(GetFileDescriptor(handle));
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return new ZipArchive(handle);
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}
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ZipEntry* ZipArchive::Find(const char* name, std::string* error_msg) const {
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DCHECK(name != nullptr);
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// Resist the urge to delete the space. <: is a bigraph sequence.
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std::unique_ptr< ::ZipEntry> zip_entry(new ::ZipEntry);
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const int32_t error = FindEntry(handle_, name, zip_entry.get());
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if (error != 0) {
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*error_msg = std::string(ErrorCodeString(error));
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return nullptr;
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}
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return new ZipEntry(handle_, zip_entry.release(), name);
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}
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ZipArchive::~ZipArchive() {
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CloseArchive(handle_);
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}
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} // namespace art
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