gfx/ots/include/ots-memory-stream.h@129ffea94266
gfx/ots/include/ots-memory-stream.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef OTS_MEMORY_STREAM_H_
6 #define OTS_MEMORY_STREAM_H_
8 #include <cstring>
9 #include <limits>
11 #include "opentype-sanitiser.h"
13 namespace ots {
15 class MemoryStream : public OTSStream {
16 public:
17 MemoryStream(void *ptr, size_t length)
18 : ptr_(ptr), length_(length), off_(0) {
19 }
21 virtual bool WriteRaw(const void *data, size_t length) {
22 if ((off_ + length > length_) ||
23 (length > std::numeric_limits<size_t>::max() - off_)) {
24 return false;
25 }
26 std::memcpy(static_cast<char*>(ptr_) + off_, data, length);
27 off_ += length;
28 return true;
29 }
31 virtual bool Seek(off_t position) {
32 if (position < 0) return false;
33 if (static_cast<size_t>(position) > length_) return false;
34 off_ = position;
35 return true;
36 }
38 virtual off_t Tell() const {
39 return off_;
40 }
42 private:
43 void* const ptr_;
44 size_t length_;
45 off_t off_;
46 };
48 class ExpandingMemoryStream : public OTSStream {
49 public:
50 ExpandingMemoryStream(size_t initial, size_t limit)
51 : length_(initial), limit_(limit), off_(0) {
52 ptr_ = new uint8_t[length_];
53 }
55 ~ExpandingMemoryStream() {
56 delete[] static_cast<uint8_t*>(ptr_);
57 }
59 void* get() const {
60 return ptr_;
61 }
63 bool WriteRaw(const void *data, size_t length) {
64 if ((off_ + length > length_) ||
65 (length > std::numeric_limits<size_t>::max() - off_)) {
66 if (length_ == limit_)
67 return false;
68 size_t new_length = (length_ + 1) * 2;
69 if (new_length < length_)
70 return false;
71 if (new_length > limit_)
72 new_length = limit_;
73 uint8_t* new_buf = new uint8_t[new_length];
74 std::memcpy(new_buf, ptr_, length_);
75 length_ = new_length;
76 delete[] static_cast<uint8_t*>(ptr_);
77 ptr_ = new_buf;
78 return WriteRaw(data, length);
79 }
80 std::memcpy(static_cast<char*>(ptr_) + off_, data, length);
81 off_ += length;
82 return true;
83 }
85 bool Seek(off_t position) {
86 if (position < 0) return false;
87 if (static_cast<size_t>(position) > length_) return false;
88 off_ = position;
89 return true;
90 }
92 off_t Tell() const {
93 return off_;
94 }
96 private:
97 void* ptr_;
98 size_t length_;
99 const size_t limit_;
100 off_t off_;
101 };
103 } // namespace ots
105 #endif // OTS_MEMORY_STREAM_H_
