15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2012 Koji Ishii <kojiishi@gmail.com> 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Redistribution and use in source and binary forms, with or without 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modification, are permitted provided that the following conditions 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * are met: 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 1. Redistributions of source code must retain the above copyright 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer. 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 2. Redistributions in binary form must reproduce the above copyright 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer in the 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * documentation and/or other materials provided with the distribution. 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */ 245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#ifndef OpenTypeTypes_h 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define OpenTypeTypes_h 275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 281e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#include "platform/SharedBuffer.h" 299bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles)#include "wtf/ByteOrder.h" 305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 31c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)namespace blink { 325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)namespace OpenType { 335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 349bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles)struct Int16 { 359bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) Int16(int16_t u) : v(htons(static_cast<uint16_t>(u))) { } 369bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) operator int16_t() const { return static_cast<int16_t>(ntohs(v)); } 379bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) uint16_t v; // in BigEndian 385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 409bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles)struct UInt16 { 419bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) UInt16(uint16_t u) : v(htons(u)) { } 429bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) operator uint16_t() const { return ntohs(v); } 439bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) uint16_t v; // in BigEndian 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 469bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles)struct Int32 { 479bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) Int32(int32_t u) : v(htonl(static_cast<uint32_t>(u))) { } 489bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) operator int32_t() const { return static_cast<int32_t>(ntohl(v)); } 499bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) uint32_t v; // in BigEndian 505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 529bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles)struct UInt32 { 539bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) UInt32(uint32_t u) : v(htonl(u)) { } 549bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) operator uint32_t() const { return ntohl(v); } 559bbd2f5e390b01907d97ecffde80aa1b06113aacTorne (Richard Coles) uint32_t v; // in BigEndian 565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)typedef UInt32 Fixed; 595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)typedef UInt16 Offset; 605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)typedef UInt16 GlyphID; 615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)// OTTag is native because it's only compared against constants, so we don't 635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)// do endian conversion here but make sure constants are in big-endian order. 645c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)// Note that multi-character literal is implementation-defined in C++0x. 655c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)typedef uint32_t Tag; 665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define OT_MAKE_TAG(ch1, ch2, ch3, ch4) ((((uint32_t)(ch4)) << 24) | (((uint32_t)(ch3)) << 16) | (((uint32_t)(ch2)) << 8) | ((uint32_t)(ch1))) 675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)template <typename T> static const T* validateTable(const RefPtr<SharedBuffer>& buffer, size_t count = 1) 695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!buffer || buffer->size() < sizeof(T) * count) 715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return 0; 725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return reinterpret_cast<const T*>(buffer->data()); 735c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)struct TableBase { 765c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)protected: 775c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static bool isValidEnd(const SharedBuffer& buffer, const void* position) 785c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 795c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (position < buffer.data()) 805c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return false; 815c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) size_t offset = reinterpret_cast<const char*>(position) - buffer.data(); 825c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return offset <= buffer.size(); // "<=" because end is included as valid 835c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 845c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 855c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template <typename T> static const T* validatePtr(const SharedBuffer& buffer, const void* position) 865c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 875c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const T* casted = reinterpret_cast<const T*>(position); 885c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!isValidEnd(buffer, &casted[1])) 895c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return 0; 905c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return casted; 915c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 925c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 935c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template <typename T> const T* validateOffset(const SharedBuffer& buffer, uint16_t offset) const 945c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 955c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return validatePtr<T>(buffer, reinterpret_cast<const int8_t*>(this) + offset); 965c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 975c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 985c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 995c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} // namespace OpenType 100c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)} // namespace blink 1015c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif // OpenTypeTypes_h 102