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      1 /*
      2  * Copyright (C) 2017 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 "io/Util.h"
     18 
     19 #include "google/protobuf/io/zero_copy_stream_impl_lite.h"
     20 
     21 using ::android::StringPiece;
     22 using ::google::protobuf::io::ZeroCopyOutputStream;
     23 
     24 namespace aapt {
     25 namespace io {
     26 
     27 bool CopyInputStreamToArchive(IAaptContext* context, InputStream* in, const std::string& out_path,
     28                               uint32_t compression_flags, IArchiveWriter* writer) {
     29   if (context->IsVerbose()) {
     30     context->GetDiagnostics()->Note(DiagMessage() << "writing " << out_path << " to archive");
     31   }
     32 
     33   if (!writer->WriteFile(out_path, compression_flags, in)) {
     34     context->GetDiagnostics()->Error(DiagMessage() << "failed to write " << out_path
     35                                                    << " to archive: " << writer->GetError());
     36     return false;
     37   }
     38   return true;
     39 }
     40 
     41 bool CopyFileToArchive(IAaptContext* context, io::IFile* file, const std::string& out_path,
     42                        uint32_t compression_flags, IArchiveWriter* writer) {
     43   std::unique_ptr<io::IData> data = file->OpenAsData();
     44   if (!data) {
     45     context->GetDiagnostics()->Error(DiagMessage(file->GetSource()) << "failed to open file");
     46     return false;
     47   }
     48   return CopyInputStreamToArchive(context, data.get(), out_path, compression_flags, writer);
     49 }
     50 
     51 bool CopyFileToArchivePreserveCompression(IAaptContext* context, io::IFile* file,
     52                                           const std::string& out_path, IArchiveWriter* writer) {
     53   uint32_t compression_flags = file->WasCompressed() ? ArchiveEntry::kCompress : 0u;
     54   return CopyFileToArchive(context, file, out_path, compression_flags, writer);
     55 }
     56 
     57 bool CopyProtoToArchive(IAaptContext* context, ::google::protobuf::MessageLite* proto_msg,
     58                         const std::string& out_path, uint32_t compression_flags,
     59                         IArchiveWriter* writer) {
     60   if (context->IsVerbose()) {
     61     context->GetDiagnostics()->Note(DiagMessage() << "writing " << out_path << " to archive");
     62   }
     63 
     64   if (writer->StartEntry(out_path, compression_flags)) {
     65     // Make sure CopyingOutputStreamAdaptor is deleted before we call writer->FinishEntry().
     66     {
     67       // Wrap our IArchiveWriter with an adaptor that implements the ZeroCopyOutputStream interface.
     68       ::google::protobuf::io::CopyingOutputStreamAdaptor adaptor(writer);
     69       if (!proto_msg->SerializeToZeroCopyStream(&adaptor)) {
     70         context->GetDiagnostics()->Error(DiagMessage() << "failed to write " << out_path
     71                                                        << " to archive");
     72         return false;
     73       }
     74     }
     75 
     76     if (writer->FinishEntry()) {
     77       return true;
     78     }
     79   }
     80   context->GetDiagnostics()->Error(DiagMessage() << "failed to write " << out_path
     81                                                  << " to archive: " << writer->GetError());
     82   return false;
     83 }
     84 
     85 bool Copy(OutputStream* out, InputStream* in) {
     86   const void* in_buffer;
     87   size_t in_len;
     88   while (in->Next(&in_buffer, &in_len)) {
     89     void* out_buffer;
     90     size_t out_len;
     91     if (!out->Next(&out_buffer, &out_len)) {
     92       return !out->HadError();
     93     }
     94 
     95     const size_t bytes_to_copy = in_len < out_len ? in_len : out_len;
     96     memcpy(out_buffer, in_buffer, bytes_to_copy);
     97     out->BackUp(out_len - bytes_to_copy);
     98     in->BackUp(in_len - bytes_to_copy);
     99   }
    100   return !in->HadError();
    101 }
    102 
    103 bool Copy(OutputStream* out, const StringPiece& in) {
    104   const char* in_buffer = in.data();
    105   size_t in_len = in.size();
    106   while (in_len != 0) {
    107     void* out_buffer;
    108     size_t out_len;
    109     if (!out->Next(&out_buffer, &out_len)) {
    110       return false;
    111     }
    112 
    113     const size_t bytes_to_copy = in_len < out_len ? in_len : out_len;
    114     memcpy(out_buffer, in_buffer, bytes_to_copy);
    115     out->BackUp(out_len - bytes_to_copy);
    116     in_buffer += bytes_to_copy;
    117     in_len -= bytes_to_copy;
    118   }
    119   return true;
    120 }
    121 
    122 bool Copy(ZeroCopyOutputStream* out, InputStream* in) {
    123   OutputStreamAdaptor adaptor(out);
    124   return Copy(&adaptor, in);
    125 }
    126 
    127 }  // namespace io
    128 }  // namespace aapt
    129