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 "random_access_file_utils.h"
18
19 #include <vector>
20
21 #include "random_access_file.h"
22
23 namespace unix_file {
24
CopyFile(const RandomAccessFile & src,RandomAccessFile * dst)25 bool CopyFile(const RandomAccessFile& src, RandomAccessFile* dst) {
26 // We don't call src->GetLength because some files (those in /proc, say)
27 // don't know how long they are. We just read until there's nothing left.
28 std::vector<char> buf(4096);
29 int64_t offset = 0;
30 int64_t n;
31 while ((n = src.Read(&buf[0], buf.size(), offset)) > 0) {
32 if (dst->Write(&buf[0], n, offset) != n) {
33 return false;
34 }
35 offset += n;
36 }
37 return n >= 0;
38 }
39
40 } // namespace unix_file
41