gfx/ots/include/ots-memory-stream.h@129ffea94266 (annotated)
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.
| michael@0 | 1 | // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #ifndef OTS_MEMORY_STREAM_H_ |
| michael@0 | 6 | #define OTS_MEMORY_STREAM_H_ |
| michael@0 | 7 | |
| michael@0 | 8 | #include <cstring> |
| michael@0 | 9 | #include <limits> |
| michael@0 | 10 | |
| michael@0 | 11 | #include "opentype-sanitiser.h" |
| michael@0 | 12 | |
| michael@0 | 13 | namespace ots { |
| michael@0 | 14 | |
| michael@0 | 15 | class MemoryStream : public OTSStream { |
| michael@0 | 16 | public: |
| michael@0 | 17 | MemoryStream(void *ptr, size_t length) |
| michael@0 | 18 | : ptr_(ptr), length_(length), off_(0) { |
| michael@0 | 19 | } |
| michael@0 | 20 | |
| michael@0 | 21 | virtual bool WriteRaw(const void *data, size_t length) { |
| michael@0 | 22 | if ((off_ + length > length_) || |
| michael@0 | 23 | (length > std::numeric_limits<size_t>::max() - off_)) { |
| michael@0 | 24 | return false; |
| michael@0 | 25 | } |
| michael@0 | 26 | std::memcpy(static_cast<char*>(ptr_) + off_, data, length); |
| michael@0 | 27 | off_ += length; |
| michael@0 | 28 | return true; |
| michael@0 | 29 | } |
| michael@0 | 30 | |
| michael@0 | 31 | virtual bool Seek(off_t position) { |
| michael@0 | 32 | if (position < 0) return false; |
| michael@0 | 33 | if (static_cast<size_t>(position) > length_) return false; |
| michael@0 | 34 | off_ = position; |
| michael@0 | 35 | return true; |
| michael@0 | 36 | } |
| michael@0 | 37 | |
| michael@0 | 38 | virtual off_t Tell() const { |
| michael@0 | 39 | return off_; |
| michael@0 | 40 | } |
| michael@0 | 41 | |
| michael@0 | 42 | private: |
| michael@0 | 43 | void* const ptr_; |
| michael@0 | 44 | size_t length_; |
| michael@0 | 45 | off_t off_; |
| michael@0 | 46 | }; |
| michael@0 | 47 | |
| michael@0 | 48 | class ExpandingMemoryStream : public OTSStream { |
| michael@0 | 49 | public: |
| michael@0 | 50 | ExpandingMemoryStream(size_t initial, size_t limit) |
| michael@0 | 51 | : length_(initial), limit_(limit), off_(0) { |
| michael@0 | 52 | ptr_ = new uint8_t[length_]; |
| michael@0 | 53 | } |
| michael@0 | 54 | |
| michael@0 | 55 | ~ExpandingMemoryStream() { |
| michael@0 | 56 | delete[] static_cast<uint8_t*>(ptr_); |
| michael@0 | 57 | } |
| michael@0 | 58 | |
| michael@0 | 59 | void* get() const { |
| michael@0 | 60 | return ptr_; |
| michael@0 | 61 | } |
| michael@0 | 62 | |
| michael@0 | 63 | bool WriteRaw(const void *data, size_t length) { |
| michael@0 | 64 | if ((off_ + length > length_) || |
| michael@0 | 65 | (length > std::numeric_limits<size_t>::max() - off_)) { |
| michael@0 | 66 | if (length_ == limit_) |
| michael@0 | 67 | return false; |
| michael@0 | 68 | size_t new_length = (length_ + 1) * 2; |
| michael@0 | 69 | if (new_length < length_) |
| michael@0 | 70 | return false; |
| michael@0 | 71 | if (new_length > limit_) |
| michael@0 | 72 | new_length = limit_; |
| michael@0 | 73 | uint8_t* new_buf = new uint8_t[new_length]; |
| michael@0 | 74 | std::memcpy(new_buf, ptr_, length_); |
| michael@0 | 75 | length_ = new_length; |
| michael@0 | 76 | delete[] static_cast<uint8_t*>(ptr_); |
| michael@0 | 77 | ptr_ = new_buf; |
| michael@0 | 78 | return WriteRaw(data, length); |
| michael@0 | 79 | } |
| michael@0 | 80 | std::memcpy(static_cast<char*>(ptr_) + off_, data, length); |
| michael@0 | 81 | off_ += length; |
| michael@0 | 82 | return true; |
| michael@0 | 83 | } |
| michael@0 | 84 | |
| michael@0 | 85 | bool Seek(off_t position) { |
| michael@0 | 86 | if (position < 0) return false; |
| michael@0 | 87 | if (static_cast<size_t>(position) > length_) return false; |
| michael@0 | 88 | off_ = position; |
| michael@0 | 89 | return true; |
| michael@0 | 90 | } |
| michael@0 | 91 | |
| michael@0 | 92 | off_t Tell() const { |
| michael@0 | 93 | return off_; |
| michael@0 | 94 | } |
| michael@0 | 95 | |
| michael@0 | 96 | private: |
| michael@0 | 97 | void* ptr_; |
| michael@0 | 98 | size_t length_; |
| michael@0 | 99 | const size_t limit_; |
| michael@0 | 100 | off_t off_; |
| michael@0 | 101 | }; |
| michael@0 | 102 | |
| michael@0 | 103 | } // namespace ots |
| michael@0 | 104 | |
| michael@0 | 105 | #endif // OTS_MEMORY_STREAM_H_ |
