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
parse_be16(const uint8_t * & p)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
parse_be32(const uint8_t * & p)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
parse_be64(const uint8_t * & p)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
ReadTable_head(SkFontID fontID,SkSfntTable_head * head)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
ReadTable_maxp(SkFontID fontID,SkSfntTable_maxp * maxp)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