1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "zip_archive.h"
18
19 #include <fcntl.h>
20 #include <stdio.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <unistd.h>
24 #include <vector>
25
26 #include "base/stringprintf.h"
27 #include "base/unix_file/fd_file.h"
28
29 namespace art {
30
GetUncompressedLength()31 uint32_t ZipEntry::GetUncompressedLength() {
32 return zip_entry_->uncompressed_length;
33 }
34
GetCrc32()35 uint32_t ZipEntry::GetCrc32() {
36 return zip_entry_->crc32;
37 }
38
~ZipEntry()39 ZipEntry::~ZipEntry() {
40 delete zip_entry_;
41 }
42
ExtractToFile(File & file,std::string * error_msg)43 bool ZipEntry::ExtractToFile(File& file, std::string* error_msg) {
44 const int32_t error = ExtractEntryToFile(handle_, zip_entry_, file.Fd());
45 if (error) {
46 *error_msg = std::string(ErrorCodeString(error));
47 return false;
48 }
49
50 return true;
51 }
52
ExtractToMemMap(const char * zip_filename,const char * entry_filename,std::string * error_msg)53 MemMap* ZipEntry::ExtractToMemMap(const char* zip_filename, const char* entry_filename,
54 std::string* error_msg) {
55 std::string name(entry_filename);
56 name += " extracted in memory from ";
57 name += zip_filename;
58 std::unique_ptr<MemMap> map(MemMap::MapAnonymous(name.c_str(),
59 nullptr, GetUncompressedLength(),
60 PROT_READ | PROT_WRITE, false, false,
61 error_msg));
62 if (map.get() == nullptr) {
63 DCHECK(!error_msg->empty());
64 return nullptr;
65 }
66
67 const int32_t error = ExtractToMemory(handle_, zip_entry_,
68 map->Begin(), map->Size());
69 if (error) {
70 *error_msg = std::string(ErrorCodeString(error));
71 return nullptr;
72 }
73
74 return map.release();
75 }
76
SetCloseOnExec(int fd)77 static void SetCloseOnExec(int fd) {
78 // This dance is more portable than Linux's O_CLOEXEC open(2) flag.
79 int flags = fcntl(fd, F_GETFD);
80 if (flags == -1) {
81 PLOG(WARNING) << "fcntl(" << fd << ", F_GETFD) failed";
82 return;
83 }
84 int rc = fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
85 if (rc == -1) {
86 PLOG(WARNING) << "fcntl(" << fd << ", F_SETFD, " << flags << ") failed";
87 return;
88 }
89 }
90
Open(const char * filename,std::string * error_msg)91 ZipArchive* ZipArchive::Open(const char* filename, std::string* error_msg) {
92 DCHECK(filename != nullptr);
93
94 ZipArchiveHandle handle;
95 const int32_t error = OpenArchive(filename, &handle);
96 if (error) {
97 *error_msg = std::string(ErrorCodeString(error));
98 CloseArchive(handle);
99 return nullptr;
100 }
101
102 SetCloseOnExec(GetFileDescriptor(handle));
103 return new ZipArchive(handle);
104 }
105
OpenFromFd(int fd,const char * filename,std::string * error_msg)106 ZipArchive* ZipArchive::OpenFromFd(int fd, const char* filename, std::string* error_msg) {
107 DCHECK(filename != nullptr);
108 DCHECK_GT(fd, 0);
109
110 ZipArchiveHandle handle;
111 const int32_t error = OpenArchiveFd(fd, filename, &handle);
112 if (error) {
113 *error_msg = std::string(ErrorCodeString(error));
114 CloseArchive(handle);
115 return nullptr;
116 }
117
118 SetCloseOnExec(GetFileDescriptor(handle));
119 return new ZipArchive(handle);
120 }
121
Find(const char * name,std::string * error_msg) const122 ZipEntry* ZipArchive::Find(const char* name, std::string* error_msg) const {
123 DCHECK(name != nullptr);
124
125 // Resist the urge to delete the space. <: is a bigraph sequence.
126 std::unique_ptr< ::ZipEntry> zip_entry(new ::ZipEntry);
127 const int32_t error = FindEntry(handle_, ZipEntryName(name), zip_entry.get());
128 if (error) {
129 *error_msg = std::string(ErrorCodeString(error));
130 return nullptr;
131 }
132
133 return new ZipEntry(handle_, zip_entry.release());
134 }
135
136 } // namespace art
137