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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "nacl_io/memfs/mem_fs_node.h" | 5 #include "nacl_io/memfs/mem_fs_node.h" |
6 | 6 |
7 #include <errno.h> | 7 #include <errno.h> |
8 #include <string.h> | 8 #include <string.h> |
9 | 9 |
10 #include <algorithm> | 10 #include <algorithm> |
11 | 11 |
12 #include "nacl_io/kernel_handle.h" | 12 #include "nacl_io/kernel_handle.h" |
13 #include "nacl_io/osstat.h" | 13 #include "nacl_io/osstat.h" |
14 #include "sdk_util/auto_lock.h" | 14 #include "sdk_util/auto_lock.h" |
15 | 15 |
16 namespace nacl_io { | 16 namespace nacl_io { |
17 | 17 |
18 namespace { | 18 namespace { |
19 | 19 |
20 // The maximum size to reserve in addition to the requested size. Resize() will | 20 // The maximum size to reserve in addition to the requested size. Resize() will |
21 // allocate twice as much as requested, up to this value. | 21 // allocate twice as much as requested, up to this value. |
22 const size_t kMaxResizeIncrement = 16 * 1024 * 1024; | 22 const size_t kMaxResizeIncrement = 16 * 1024 * 1024; |
23 | 23 |
24 } // namespace | 24 } // namespace |
25 | 25 |
26 MemFsNode::MemFsNode(Filesystem* filesystem) : Node(filesystem) { | 26 MemFsNode::MemFsNode(Filesystem* filesystem) : Node(filesystem) { |
27 SetType(S_IFREG); | 27 SetType(S_IFREG); |
28 } | 28 } |
29 | 29 |
30 MemFsNode::~MemFsNode() {} | 30 MemFsNode::~MemFsNode() { |
| 31 } |
31 | 32 |
32 Error MemFsNode::Read(const HandleAttr& attr, | 33 Error MemFsNode::Read(const HandleAttr& attr, |
33 void* buf, | 34 void* buf, |
34 size_t count, | 35 size_t count, |
35 int* out_bytes) { | 36 int* out_bytes) { |
36 *out_bytes = 0; | 37 *out_bytes = 0; |
37 | 38 |
38 AUTO_LOCK(node_lock_); | 39 AUTO_LOCK(node_lock_); |
39 if (count == 0) | 40 if (count == 0) |
40 return 0; | 41 return 0; |
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85 } else if (new_size < stat_.st_size) { | 86 } else if (new_size < stat_.st_size) { |
86 // Shrink to fit. std::vector usually doesn't reduce allocation size, so | 87 // Shrink to fit. std::vector usually doesn't reduce allocation size, so |
87 // use the swap trick. | 88 // use the swap trick. |
88 std::vector<char>(data_).swap(data_); | 89 std::vector<char>(data_).swap(data_); |
89 } | 90 } |
90 data_.resize(new_size); | 91 data_.resize(new_size); |
91 stat_.st_size = new_size; | 92 stat_.st_size = new_size; |
92 } | 93 } |
93 | 94 |
94 } // namespace nacl_io | 95 } // namespace nacl_io |
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