yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 1 | // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef OTS_H_ |
| 6 | #define OTS_H_ |
| 7 | |
yusukes@chromium.org | 7f9bebe | 2011-06-07 05:25:38 +0000 | [diff] [blame] | 8 | #include <stddef.h> |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 9 | #include <cstdarg> |
bashi@chromium.org | cd35d03 | 2011-05-31 07:38:53 +0000 | [diff] [blame] | 10 | #include <cstddef> |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 11 | #include <cstdio> |
| 12 | #include <cstdlib> |
| 13 | #include <cstring> |
ksakamoto@chromium.org | 74343ba | 2013-05-08 01:20:29 +0000 | [diff] [blame] | 14 | #include <limits> |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 15 | |
| 16 | #include "opentype-sanitiser.h" |
| 17 | |
ksakamoto@chromium.org | 74343ba | 2013-05-08 01:20:29 +0000 | [diff] [blame] | 18 | // arraysize borrowed from base/basictypes.h |
| 19 | template <typename T, size_t N> |
| 20 | char (&ArraySizeHelper(T (&array)[N]))[N]; |
| 21 | #define arraysize(array) (sizeof(ArraySizeHelper(array))) |
| 22 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 23 | namespace ots { |
| 24 | |
| 25 | #if defined(_MSC_VER) || !defined(OTS_DEBUG) |
| 26 | #define OTS_FAILURE() false |
| 27 | #else |
| 28 | #define OTS_FAILURE() ots::Failure(__FILE__, __LINE__, __PRETTY_FUNCTION__) |
| 29 | bool Failure(const char *f, int l, const char *fn); |
| 30 | #endif |
| 31 | |
| 32 | #if defined(_MSC_VER) |
| 33 | // MSVC supports C99 style variadic macros. |
| 34 | #define OTS_WARNING(format, ...) |
| 35 | #else |
| 36 | // GCC |
| 37 | #if defined(OTS_DEBUG) |
| 38 | #define OTS_WARNING(format, args...) \ |
| 39 | ots::Warning(__FILE__, __LINE__, format, ##args) |
| 40 | void Warning(const char *f, int l, const char *format, ...) |
| 41 | __attribute__((format(printf, 3, 4))); |
| 42 | #else |
| 43 | #define OTS_WARNING(format, args...) |
| 44 | #endif |
| 45 | #endif |
| 46 | |
| 47 | // Define OTS_NO_TRANSCODE_HINTS (i.e., g++ -DOTS_NO_TRANSCODE_HINTS) if you |
| 48 | // want to omit TrueType hinting instructions and variables in glyf, fpgm, prep, |
| 49 | // and cvt tables. |
| 50 | #if defined(OTS_NO_TRANSCODE_HINTS) |
| 51 | const bool g_transcode_hints = false; |
| 52 | #else |
| 53 | const bool g_transcode_hints = true; |
| 54 | #endif |
| 55 | |
| 56 | // ----------------------------------------------------------------------------- |
| 57 | // Buffer helper class |
| 58 | // |
| 59 | // This class perform some trival buffer operations while checking for |
| 60 | // out-of-bounds errors. As a family they return false if anything is amiss, |
| 61 | // updating the current offset otherwise. |
| 62 | // ----------------------------------------------------------------------------- |
| 63 | class Buffer { |
| 64 | public: |
| 65 | Buffer(const uint8_t *buffer, size_t len) |
| 66 | : buffer_(buffer), |
| 67 | length_(len), |
| 68 | offset_(0) { } |
| 69 | |
| 70 | bool Skip(size_t n_bytes) { |
| 71 | return Read(NULL, n_bytes); |
| 72 | } |
| 73 | |
| 74 | bool Read(uint8_t *buffer, size_t n_bytes) { |
| 75 | if (n_bytes > 1024 * 1024 * 1024) { |
| 76 | return OTS_FAILURE(); |
| 77 | } |
| 78 | if ((offset_ + n_bytes > length_) || |
| 79 | (offset_ > length_ - n_bytes)) { |
| 80 | return OTS_FAILURE(); |
| 81 | } |
| 82 | if (buffer) { |
| 83 | std::memcpy(buffer, buffer_ + offset_, n_bytes); |
| 84 | } |
| 85 | offset_ += n_bytes; |
| 86 | return true; |
| 87 | } |
| 88 | |
| 89 | inline bool ReadU8(uint8_t *value) { |
| 90 | if (offset_ + 1 > length_) { |
| 91 | return OTS_FAILURE(); |
| 92 | } |
| 93 | *value = buffer_[offset_]; |
| 94 | ++offset_; |
| 95 | return true; |
| 96 | } |
| 97 | |
| 98 | bool ReadU16(uint16_t *value) { |
| 99 | if (offset_ + 2 > length_) { |
| 100 | return OTS_FAILURE(); |
| 101 | } |
| 102 | std::memcpy(value, buffer_ + offset_, sizeof(uint16_t)); |
| 103 | *value = ntohs(*value); |
| 104 | offset_ += 2; |
| 105 | return true; |
| 106 | } |
| 107 | |
| 108 | bool ReadS16(int16_t *value) { |
| 109 | return ReadU16(reinterpret_cast<uint16_t*>(value)); |
| 110 | } |
| 111 | |
bashi@google.com | 93aedf7 | 2010-12-24 00:29:23 +0000 | [diff] [blame] | 112 | bool ReadU24(uint32_t *value) { |
| 113 | if (offset_ + 3 > length_) { |
| 114 | return OTS_FAILURE(); |
| 115 | } |
| 116 | *value = static_cast<uint32_t>(buffer_[offset_]) << 16 | |
| 117 | static_cast<uint32_t>(buffer_[offset_ + 1]) << 8 | |
| 118 | static_cast<uint32_t>(buffer_[offset_ + 2]); |
| 119 | offset_ += 3; |
| 120 | return true; |
| 121 | } |
| 122 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 123 | bool ReadU32(uint32_t *value) { |
| 124 | if (offset_ + 4 > length_) { |
| 125 | return OTS_FAILURE(); |
| 126 | } |
| 127 | std::memcpy(value, buffer_ + offset_, sizeof(uint32_t)); |
| 128 | *value = ntohl(*value); |
| 129 | offset_ += 4; |
| 130 | return true; |
| 131 | } |
| 132 | |
| 133 | bool ReadS32(int32_t *value) { |
| 134 | return ReadU32(reinterpret_cast<uint32_t*>(value)); |
| 135 | } |
| 136 | |
| 137 | bool ReadTag(uint32_t *value) { |
| 138 | if (offset_ + 4 > length_) { |
| 139 | return OTS_FAILURE(); |
| 140 | } |
| 141 | std::memcpy(value, buffer_ + offset_, sizeof(uint32_t)); |
| 142 | offset_ += 4; |
| 143 | return true; |
| 144 | } |
| 145 | |
| 146 | bool ReadR64(uint64_t *value) { |
| 147 | if (offset_ + 8 > length_) { |
| 148 | return OTS_FAILURE(); |
| 149 | } |
| 150 | std::memcpy(value, buffer_ + offset_, sizeof(uint64_t)); |
| 151 | offset_ += 8; |
| 152 | return true; |
| 153 | } |
| 154 | |
yusukes@chromium.org | 6263d06 | 2010-08-06 03:27:28 +0000 | [diff] [blame] | 155 | const uint8_t *buffer() const { return buffer_; } |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 156 | size_t offset() const { return offset_; } |
| 157 | size_t length() const { return length_; } |
| 158 | |
| 159 | void set_offset(size_t newoffset) { offset_ = newoffset; } |
| 160 | |
| 161 | private: |
| 162 | const uint8_t * const buffer_; |
| 163 | const size_t length_; |
| 164 | size_t offset_; |
| 165 | }; |
| 166 | |
ksakamoto@chromium.org | 74343ba | 2013-05-08 01:20:29 +0000 | [diff] [blame] | 167 | // Round a value up to the nearest multiple of 4. Don't round the value in the |
| 168 | // case that rounding up overflows. |
| 169 | template<typename T> T Round4(T value) { |
| 170 | if (std::numeric_limits<T>::max() - value < 3) { |
| 171 | return value; |
| 172 | } |
| 173 | return (value + 3) & ~3; |
| 174 | } |
| 175 | |
ksakamoto@chromium.org | a416dc6 | 2013-05-08 03:39:15 +0000 | [diff] [blame] | 176 | template<typename T> T Round2(T value) { |
| 177 | if (value == std::numeric_limits<T>::max()) { |
| 178 | return value; |
| 179 | } |
| 180 | return (value + 1) & ~1; |
| 181 | } |
| 182 | |
ksakamoto@chromium.org | 74343ba | 2013-05-08 01:20:29 +0000 | [diff] [blame] | 183 | bool IsValidVersionTag(uint32_t tag); |
| 184 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 185 | #define FOR_EACH_TABLE_TYPE \ |
bashi@chromium.org | 6462c58 | 2014-06-27 06:24:49 +0000 | [diff] [blame^] | 186 | F(cbdt, CBDT) \ |
| 187 | F(cblc, CBLC) \ |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 188 | F(cff, CFF) \ |
| 189 | F(cmap, CMAP) \ |
| 190 | F(cvt, CVT) \ |
| 191 | F(fpgm, FPGM) \ |
| 192 | F(gasp, GASP) \ |
bashi@google.com | 00b790a | 2011-01-27 06:35:42 +0000 | [diff] [blame] | 193 | F(gdef, GDEF) \ |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 194 | F(glyf, GLYF) \ |
bashi@chromium.org | ced7112 | 2011-02-17 10:23:47 +0000 | [diff] [blame] | 195 | F(gpos, GPOS) \ |
bashi@chromium.org | a574866 | 2011-03-18 17:48:29 +0000 | [diff] [blame] | 196 | F(gsub, GSUB) \ |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 197 | F(hdmx, HDMX) \ |
| 198 | F(head, HEAD) \ |
| 199 | F(hhea, HHEA) \ |
| 200 | F(hmtx, HMTX) \ |
yusukes@chromium.org | f12575f | 2010-02-02 21:26:17 +0000 | [diff] [blame] | 201 | F(kern, KERN) \ |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 202 | F(loca, LOCA) \ |
| 203 | F(ltsh, LTSH) \ |
ksakamoto@chromium.org | eea4836 | 2014-01-20 02:15:37 +0000 | [diff] [blame] | 204 | F(math, MATH) \ |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 205 | F(maxp, MAXP) \ |
| 206 | F(name, NAME) \ |
| 207 | F(os2, OS2) \ |
| 208 | F(post, POST) \ |
| 209 | F(prep, PREP) \ |
| 210 | F(vdmx, VDMX) \ |
bashi@chromium.org | 4dcad60 | 2011-03-28 20:51:38 +0000 | [diff] [blame] | 211 | F(vorg, VORG) \ |
| 212 | F(vhea, VHEA) \ |
| 213 | F(vmtx, VMTX) |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 214 | |
| 215 | #define F(name, capname) struct OpenType##capname; |
| 216 | FOR_EACH_TABLE_TYPE |
| 217 | #undef F |
| 218 | |
| 219 | struct OpenTypeFile { |
| 220 | OpenTypeFile() { |
| 221 | #define F(name, capname) name = NULL; |
| 222 | FOR_EACH_TABLE_TYPE |
| 223 | #undef F |
| 224 | } |
| 225 | |
| 226 | uint32_t version; |
| 227 | uint16_t num_tables; |
| 228 | uint16_t search_range; |
| 229 | uint16_t entry_selector; |
| 230 | uint16_t range_shift; |
| 231 | |
| 232 | #define F(name, capname) OpenType##capname *name; |
| 233 | FOR_EACH_TABLE_TYPE |
| 234 | #undef F |
| 235 | }; |
| 236 | |
bashi@chromium.org | 4dcad60 | 2011-03-28 20:51:38 +0000 | [diff] [blame] | 237 | #define F(name, capname) \ |
| 238 | bool ots_##name##_parse(OpenTypeFile *f, const uint8_t *d, size_t l); \ |
| 239 | bool ots_##name##_should_serialise(OpenTypeFile *f); \ |
| 240 | bool ots_##name##_serialise(OTSStream *s, OpenTypeFile *f); \ |
| 241 | void ots_##name##_free(OpenTypeFile *f); |
| 242 | // TODO(yusukes): change these function names to follow Chromium coding rule. |
| 243 | FOR_EACH_TABLE_TYPE |
| 244 | #undef F |
| 245 | |
yusukes@chromium.org | d257d18 | 2009-11-04 04:56:32 +0000 | [diff] [blame] | 246 | } // namespace ots |
| 247 | |
| 248 | #endif // OTS_H_ |