| /* |
| * Copyright (C) 2012 Koji Ishii <kojiishi@gmail.com> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef SKY_ENGINE_PLATFORM_FONTS_OPENTYPE_OPENTYPETYPES_H_ |
| #define SKY_ENGINE_PLATFORM_FONTS_OPENTYPE_OPENTYPETYPES_H_ |
| |
| #include "sky/engine/platform/SharedBuffer.h" |
| #include "sky/engine/wtf/ByteOrder.h" |
| |
| namespace blink { |
| namespace OpenType { |
| |
| struct Int16 { |
| Int16(int16_t u) : v(htons(static_cast<uint16_t>(u))) { } |
| operator int16_t() const { return static_cast<int16_t>(ntohs(v)); } |
| uint16_t v; // in BigEndian |
| }; |
| |
| struct UInt16 { |
| UInt16(uint16_t u) : v(htons(u)) { } |
| operator uint16_t() const { return ntohs(v); } |
| uint16_t v; // in BigEndian |
| }; |
| |
| struct Int32 { |
| Int32(int32_t u) : v(htonl(static_cast<uint32_t>(u))) { } |
| operator int32_t() const { return static_cast<int32_t>(ntohl(v)); } |
| uint32_t v; // in BigEndian |
| }; |
| |
| struct UInt32 { |
| UInt32(uint32_t u) : v(htonl(u)) { } |
| operator uint32_t() const { return ntohl(v); } |
| uint32_t v; // in BigEndian |
| }; |
| |
| typedef UInt32 Fixed; |
| typedef UInt16 Offset; |
| typedef UInt16 GlyphID; |
| |
| // OTTag is native because it's only compared against constants, so we don't |
| // do endian conversion here but make sure constants are in big-endian order. |
| // Note that multi-character literal is implementation-defined in C++0x. |
| typedef uint32_t Tag; |
| #define OT_MAKE_TAG(ch1, ch2, ch3, ch4) ((((uint32_t)(ch4)) << 24) | (((uint32_t)(ch3)) << 16) | (((uint32_t)(ch2)) << 8) | ((uint32_t)(ch1))) |
| |
| template <typename T> static const T* validateTable(const RefPtr<SharedBuffer>& buffer, size_t count = 1) |
| { |
| if (!buffer || buffer->size() < sizeof(T) * count) |
| return 0; |
| return reinterpret_cast<const T*>(buffer->data()); |
| } |
| |
| struct TableBase { |
| protected: |
| static bool isValidEnd(const SharedBuffer& buffer, const void* position) |
| { |
| if (position < buffer.data()) |
| return false; |
| size_t offset = reinterpret_cast<const char*>(position) - buffer.data(); |
| return offset <= buffer.size(); // "<=" because end is included as valid |
| } |
| |
| template <typename T> static const T* validatePtr(const SharedBuffer& buffer, const void* position) |
| { |
| const T* casted = reinterpret_cast<const T*>(position); |
| if (!isValidEnd(buffer, &casted[1])) |
| return 0; |
| return casted; |
| } |
| |
| template <typename T> const T* validateOffset(const SharedBuffer& buffer, uint16_t offset) const |
| { |
| return validatePtr<T>(buffer, reinterpret_cast<const int8_t*>(this) + offset); |
| } |
| }; |
| |
| } // namespace OpenType |
| } // namespace blink |
| |
| #endif // SKY_ENGINE_PLATFORM_FONTS_OPENTYPE_OPENTYPETYPES_H_ |