1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "SkEndian.h" 9 #include "SkSfntUtils.h" 10 11 static uint16_t parse_be16(const uint8_t*& p) { 12 uint16_t value = (p[0] << 8) | p[1]; 13 p += 2; 14 return value; 15 } 16 17 static uint32_t parse_be32(const uint8_t*& p) { 18 uint32_t value = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; 19 p += 4; 20 return value; 21 } 22 23 static Sk64 parse_be64(const uint8_t*& p) { 24 Sk64 value; 25 value.fHi = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; 26 value.fLo = (p[4] << 24) | (p[5] << 16) | (p[6] << 8) | p[7]; 27 p += 8; 28 return value; 29 } 30 31 /////////////////////////////////////////////////////////////////////////////// 32 33 bool SkSfntUtils::ReadTable_head(SkFontID fontID, SkSfntTable_head* head) { 34 static const uint32_t gTag = SkSetFourByteTag('h', 'e', 'a', 'd'); 35 static const size_t gSize = 54; 36 37 uint8_t storage[gSize]; 38 size_t size = SkFontHost::GetTableData(fontID, gTag, 0, gSize, storage); 39 if (size != gSize) { 40 return false; 41 } 42 43 const uint8_t* p = storage; 44 head->fVersion = parse_be32(p); 45 head->fRevision = parse_be32(p); 46 head->fCheckSumAdjustment = parse_be32(p); 47 head->fMagicNumber = parse_be32(p); 48 head->fFlags = parse_be16(p); 49 head->fUnitsPerEm = parse_be16(p); 50 head->fDateCreated = parse_be64(p); 51 head->fDateModified = parse_be64(p); 52 head->fXMin = parse_be16(p); 53 head->fXMin = parse_be16(p); 54 head->fXMin = parse_be16(p); 55 head->fXMin = parse_be16(p); 56 head->fMacStyle = parse_be16(p); 57 head->fLowestPPEM = parse_be16(p); 58 head->fFontDirectionHint = parse_be16(p); 59 head->fIndexToLocFormat = parse_be16(p); 60 head->fGlyphDataFormat = parse_be16(p); 61 SkASSERT(p - storage == (long)size); 62 return true; 63 } 64 65 bool SkSfntUtils::ReadTable_maxp(SkFontID fontID, SkSfntTable_maxp* maxp) { 66 static const uint32_t gTag = SkSetFourByteTag('m', 'a', 'x', 'p'); 67 static const size_t gSize = 32; 68 69 uint8_t storage[gSize]; 70 size_t size = SkFontHost::GetTableData(fontID, gTag, 0, gSize, storage); 71 if (size != gSize) { 72 return false; 73 } 74 75 const uint8_t* p = storage; 76 maxp->fVersion = parse_be32(p); 77 maxp->fNumGlyphs = parse_be16(p); 78 maxp->fMaxPoints = parse_be16(p); 79 maxp->fMaxContours = parse_be16(p); 80 maxp->fMaxComponentPoints = parse_be16(p); 81 maxp->fMaxComponentContours = parse_be16(p); 82 maxp->fMaxZones = parse_be16(p); 83 maxp->fMaxTwilightPoints = parse_be16(p); 84 maxp->fMaxStorage = parse_be16(p); 85 maxp->fMaxFunctionDefs = parse_be16(p); 86 maxp->fMaxInstructionDefs = parse_be16(p); 87 maxp->fMaxStackElements = parse_be16(p); 88 maxp->fMaxSizeOfInstructions = parse_be16(p); 89 maxp->fMaxComponentElements = parse_be16(p); 90 maxp->fMaxComponentDepth = parse_be16(p); 91 SkASSERT(p - storage == (long)size); 92 return true; 93 } 94 95
