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      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 
     31 uint32_t ZipEntry::GetUncompressedLength() {
     32   return zip_entry_->uncompressed_length;
     33 }
     34 
     35 uint32_t ZipEntry::GetCrc32() {
     36   return zip_entry_->crc32;
     37 }
     38 
     39 ZipEntry::~ZipEntry() {
     40   delete zip_entry_;
     41 }
     42 
     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 
     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 
     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 
     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 
    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 
    121 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