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 NULL, GetUncompressedLength(),
60 PROT_READ | PROT_WRITE, false, error_msg));
61 if (map.get() == nullptr) {
62 DCHECK(!error_msg->empty());
63 return nullptr;
64 }
65
66 const int32_t error = ExtractToMemory(handle_, zip_entry_,
67 map->Begin(), map->Size());
68 if (error) {
69 *error_msg = std::string(ErrorCodeString(error));
70 return nullptr;
71 }
72
73 return map.release();
74 }
75
SetCloseOnExec(int fd)76 static void SetCloseOnExec(int fd) {
77 // This dance is more portable than Linux's O_CLOEXEC open(2) flag.
78 int flags = fcntl(fd, F_GETFD);
79 if (flags == -1) {
80 PLOG(WARNING) << "fcntl(" << fd << ", F_GETFD) failed";
81 return;
82 }
83 int rc = fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
84 if (rc == -1) {
85 PLOG(WARNING) << "fcntl(" << fd << ", F_SETFD, " << flags << ") failed";
86 return;
87 }
88 }
89
Open(const char * filename,std::string * error_msg)90 ZipArchive* ZipArchive::Open(const char* filename, std::string* error_msg) {
91 DCHECK(filename != nullptr);
92
93 ZipArchiveHandle handle;
94 const int32_t error = OpenArchive(filename, &handle);
95 if (error) {
96 *error_msg = std::string(ErrorCodeString(error));
97 CloseArchive(handle);
98 return nullptr;
99 }
100
101 SetCloseOnExec(GetFileDescriptor(handle));
102 return new ZipArchive(handle);
103 }
104
OpenFromFd(int fd,const char * filename,std::string * error_msg)105 ZipArchive* ZipArchive::OpenFromFd(int fd, const char* filename, std::string* error_msg) {
106 DCHECK(filename != nullptr);
107 DCHECK_GT(fd, 0);
108
109 ZipArchiveHandle handle;
110 const int32_t error = OpenArchiveFd(fd, filename, &handle);
111 if (error) {
112 *error_msg = std::string(ErrorCodeString(error));
113 CloseArchive(handle);
114 return nullptr;
115 }
116
117 SetCloseOnExec(GetFileDescriptor(handle));
118 return new ZipArchive(handle);
119 }
120
Find(const char * name,std::string * error_msg) const121 ZipEntry* ZipArchive::Find(const char* name, std::string* error_msg) const {
122 DCHECK(name != nullptr);
123
124 // Resist the urge to delete the space. <: is a bigraph sequence.
125 std::unique_ptr< ::ZipEntry> zip_entry(new ::ZipEntry);
126 const int32_t error = FindEntry(handle_, name, zip_entry.get());
127 if (error) {
128 *error_msg = std::string(ErrorCodeString(error));
129 return nullptr;
130 }
131
132 return new ZipEntry(handle_, zip_entry.release());
133 }
134
135 } // namespace art
136