1 /* 2 * Copyright (C) 2009 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 <vector> 18 #include "base/unix_file/random_access_file_utils.h" 19 #include "base/unix_file/random_access_file.h" 20 21 namespace unix_file { 22 23 bool CopyFile(const RandomAccessFile& src, RandomAccessFile* dst) { 24 // We don't call src->GetLength because some files (those in /proc, say) 25 // don't know how long they are. We just read until there's nothing left. 26 std::vector<char> buf(4096); 27 int64_t offset = 0; 28 int64_t n; 29 while ((n = src.Read(&buf[0], buf.size(), offset)) > 0) { 30 if (dst->Write(&buf[0], n, offset) != n) { 31 return false; 32 } 33 offset += n; 34 } 35 return n >= 0; 36 } 37 38 } // namespace unix_file 39
