/src/ots/src/glat.cc

Source
// Copyright (c) 2009-2017 The OTS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "glat.h"

#include "gloc.h"
#include "lz4.h"
#include <list>
#include <memory>

namespace ots {

// -----------------------------------------------------------------------------
// OpenTypeGLAT_v1
// -----------------------------------------------------------------------------

bool OpenTypeGLAT_v1::Parse(const uint8_t* data, size_t length) {
  Buffer table(data, length);
  OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
      GetFont()->GetTypedTable(OTS_TAG_GLOC));
  if (!gloc) {
    return DropGraphite("Required Gloc table is missing");
  }

  if (!table.ReadU32(&this->version) || this->version >> 16 != 1) {
    return DropGraphite("Failed to read version");
  }

  const std::vector<uint32_t>& locations = gloc->GetLocations();
  if (locations.empty()) {
    return DropGraphite("No locations from Gloc table");
  }
  std::list<uint32_t> unverified(locations.begin(), locations.end());
  while (table.remaining()) {
    GlatEntry entry(this);
    if (table.offset() > unverified.front()) {
      return DropGraphite("Offset check failed for a GlatEntry");
    }
    if (table.offset() == unverified.front()) {
      unverified.pop_front();
    }
    if (unverified.empty()) {
      return DropGraphite("Expected more locations");
    }
    if (!entry.ParsePart(table)) {
      return DropGraphite("Failed to read a GlatEntry");
    }
    this->entries.push_back(entry);
  }

  if (unverified.size() != 1 || unverified.front() != table.offset()) {
    return DropGraphite("%zu location(s) could not be verified", unverified.size());
  }
  if (table.remaining()) {
    return Warning("%zu bytes unparsed", table.remaining());
  }
  return true;
}

bool OpenTypeGLAT_v1::Serialize(OTSStream* out) {
  assert(ShouldSerialize());
  if (!out->WriteU32(this->version) ||
      !SerializeParts(this->entries, out)) {
    return Error("Failed to write table");
  }
  return true;
}

bool OpenTypeGLAT_v1::GlatEntry::ParsePart(Buffer& table) {
  if (!table.ReadU8(&this->attNum)) {
    return parent->Error("GlatEntry: Failed to read attNum");
  }
  if (!table.ReadU8(&this->num)) {
    return parent->Error("GlatEntry: Failed to read num");
  }

  //this->attributes.resize(this->num);
  for (int i = 0; i < this->num; ++i) {
    this->attributes.emplace_back();
    if (!table.ReadS16(&this->attributes[i])) {
      return parent->Error("GlatEntry: Failed to read attribute %u", i);
    }
  }
  return true;
}

bool OpenTypeGLAT_v1::GlatEntry::SerializePart(OTSStream* out) const {
  if (!out->WriteU8(this->attNum) ||
      !out->WriteU8(this->num) ||
      !SerializeParts(this->attributes, out)) {
    return parent->Error("GlatEntry: Failed to write");
  }
  return true;
}

// -----------------------------------------------------------------------------
// OpenTypeGLAT_v2
// -----------------------------------------------------------------------------

bool OpenTypeGLAT_v2::Parse(const uint8_t* data, size_t length) {
  Buffer table(data, length);
  OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
      GetFont()->GetTypedTable(OTS_TAG_GLOC));
  if (!gloc) {
    return DropGraphite("Required Gloc table is missing");
  }

  if (!table.ReadU32(&this->version) || this->version >> 16 != 1) {
    return DropGraphite("Failed to read version");
  }

  const std::vector<uint32_t>& locations = gloc->GetLocations();
  if (locations.empty()) {
    return DropGraphite("No locations from Gloc table");
  }
  std::list<uint32_t> unverified(locations.begin(), locations.end());
  while (table.remaining()) {
    GlatEntry entry(this);
    if (table.offset() > unverified.front()) {
      return DropGraphite("Offset check failed for a GlatEntry");
    }
    if (table.offset() == unverified.front()) {
      unverified.pop_front();
    }
    if (unverified.empty()) {
      return DropGraphite("Expected more locations");
    }
    if (!entry.ParsePart(table)) {
      return DropGraphite("Failed to read a GlatEntry");
    }
    this->entries.push_back(entry);
  }

  if (unverified.size() != 1 || unverified.front() != table.offset()) {
    return DropGraphite("%zu location(s) could not be verified", unverified.size());
  }
  if (table.remaining()) {
    return Warning("%zu bytes unparsed", table.remaining());
  }
  return true;
}

bool OpenTypeGLAT_v2::Serialize(OTSStream* out) {
  assert(ShouldSerialize());
  if (!out->WriteU32(this->version) ||
      !SerializeParts(this->entries, out)) {
    return Error("Failed to write table");
  }
  return true;
}

bool OpenTypeGLAT_v2::GlatEntry::ParsePart(Buffer& table) {
  if (!table.ReadS16(&this->attNum)) {
    return parent->Error("GlatEntry: Failed to read attNum");
  }
  if (!table.ReadS16(&this->num) || this->num < 0) {
    return parent->Error("GlatEntry: Failed to read valid num");
  }

  //this->attributes.resize(this->num);
  for (int i = 0; i < this->num; ++i) {
    this->attributes.emplace_back();
    if (!table.ReadS16(&this->attributes[i])) {
      return parent->Error("GlatEntry: Failed to read attribute %u", i);
    }
  }
  return true;
}

bool OpenTypeGLAT_v2::GlatEntry::SerializePart(OTSStream* out) const {
  if (!out->WriteS16(this->attNum) ||
      !out->WriteS16(this->num) ||
      !SerializeParts(this->attributes, out)) {
    return parent->Error("GlatEntry: Failed to write");
  }
  return true;
}

// -----------------------------------------------------------------------------
// OpenTypeGLAT_v3
// -----------------------------------------------------------------------------

bool OpenTypeGLAT_v3::Parse(const uint8_t* data, size_t length,
                            bool prevent_decompression) {
  Buffer table(data, length);
  OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
      GetFont()->GetTypedTable(OTS_TAG_GLOC));
  if (!gloc) {
    return DropGraphite("Required Gloc table is missing");
  }

  if (!table.ReadU32(&this->version) || this->version >> 16 != 3) {
    return DropGraphite("Failed to read version");
  }
  if (!table.ReadU32(&this->compHead)) {
    return DropGraphite("Failed to read compression header");
  }
  switch ((this->compHead & SCHEME) >> 27) {
    case 0:  // uncompressed
      break;
    case 1: {  // lz4
      if (prevent_decompression) {
        return DropGraphite("Illegal nested compression");
      }
      size_t decompressed_size = this->compHead & FULL_SIZE;
      if (decompressed_size < length) {
        return DropGraphite("Decompressed size is less than compressed size");
      }
      if (decompressed_size == 0) {
        return DropGraphite("Decompressed size is set to 0");
      }
      // decompressed table must be <= OTS_MAX_DECOMPRESSED_TABLE_SIZE
      if (decompressed_size > OTS_MAX_DECOMPRESSED_TABLE_SIZE) {
        return DropGraphite("Decompressed size exceeds %gMB: %gMB",
                            OTS_MAX_DECOMPRESSED_TABLE_SIZE / (1024.0 * 1024.0),
                            decompressed_size / (1024.0 * 1024.0));
      }
      std::unique_ptr<uint8_t> decompressed(new uint8_t[decompressed_size]());
      int ret = LZ4_decompress_safe_partial(
          reinterpret_cast<const char*>(data + table.offset()),
          reinterpret_cast<char*>(decompressed.get()),
          table.remaining(),  // input buffer size (input size + padding)
          decompressed_size,  // target output size
          decompressed_size);  // output buffer size
      if (ret < 0 || unsigned(ret) != decompressed_size) {
        return DropGraphite("Decompression failed with error code %d", ret);
      }
      return this->Parse(decompressed.get(), decompressed_size, true);
    }
    default:
      return DropGraphite("Unknown compression scheme");
  }
  if (this->compHead & RESERVED) {
    Warning("Nonzero reserved");
  }

  const std::vector<uint32_t>& locations = gloc->GetLocations();
  if (locations.empty()) {
    return DropGraphite("No locations from Gloc table");
  }
  std::list<uint32_t> unverified(locations.begin(), locations.end());
  //this->entries.resize(locations.size() - 1, this);
  for (size_t i = 0; i < locations.size() - 1; ++i) {
    this->entries.emplace_back(this);
    if (table.offset() != unverified.front()) {
      return DropGraphite("Offset check failed for a GlyphAttrs");
    }
    unverified.pop_front();
    if (!this->entries[i].ParsePart(table,
                                    unverified.front() - table.offset())) {
        // unverified.front() is guaranteed to exist because of the number of
        // iterations of this loop
      return DropGraphite("Failed to read a GlyphAttrs");
    }
  }

  if (unverified.size() != 1 || unverified.front() != table.offset()) {
    return DropGraphite("%zu location(s) could not be verified", unverified.size());
  }
  if (table.remaining()) {
    return Warning("%zu bytes unparsed", table.remaining());
  }
  return true;
}

bool OpenTypeGLAT_v3::Serialize(OTSStream* out) {
  assert(ShouldSerialize());
  if (!out->WriteU32(this->version) ||
      !out->WriteU32(this->compHead) ||
      !SerializeParts(this->entries, out)) {
    return Error("Failed to write table");
  }
  return true;
}

bool OpenTypeGLAT_v3::GlyphAttrs::ParsePart(Buffer& table, const size_t size) {
  size_t init_offset = table.offset();
  if (parent->compHead & OCTABOXES && !octabox.ParsePart(table)) {
    // parent->flags & 0b1: octaboxes are present flag
    return parent->Error("GlyphAttrs: Failed to read octabox");
  }

  while (table.offset() < init_offset + size) {
    GlatEntry entry(parent);
    if (!entry.ParsePart(table)) {
      return parent->Error("GlyphAttrs: Failed to read a GlatEntry");
    }
    this->entries.push_back(entry);
  }
  return true;
}

bool OpenTypeGLAT_v3::GlyphAttrs::SerializePart(OTSStream* out) const {
  if ((parent->compHead & OCTABOXES && !octabox.SerializePart(out)) ||
      !SerializeParts(this->entries, out)) {
    return parent->Error("GlyphAttrs: Failed to write");
  }
  return true;
}

bool OpenTypeGLAT_v3::GlyphAttrs::
OctaboxMetrics::ParsePart(Buffer& table) {
  if (!table.ReadU16(&this->subbox_bitmap)) {
    return parent->Error("OctaboxMetrics: Failed to read subbox_bitmap");
  }
  if (!table.ReadU8(&this->diag_neg_min)) {
    return parent->Error("OctaboxMetrics: Failed to read diag_neg_min");
  }
  if (!table.ReadU8(&this->diag_neg_max) ||
      this->diag_neg_max < this->diag_neg_min) {
    return parent->Error("OctaboxMetrics: Failed to read valid diag_neg_max");
  }
  if (!table.ReadU8(&this->diag_pos_min)) {
    return parent->Error("OctaboxMetrics: Failed to read diag_pos_min");
  }
  if (!table.ReadU8(&this->diag_pos_max) ||
      this->diag_pos_max < this->diag_pos_min) {
    return parent->Error("OctaboxMetrics: Failed to read valid diag_pos_max");
  }

  unsigned subboxes_len = 0;  // count of 1's in this->subbox_bitmap
  for (uint16_t i = this->subbox_bitmap; i; i >>= 1) {
    if (i & 0b1) {
      ++subboxes_len;
    }
  }
  //this->subboxes.resize(subboxes_len, parent);
  for (unsigned i = 0; i < subboxes_len; i++) {
    this->subboxes.emplace_back(parent);
    if (!this->subboxes[i].ParsePart(table)) {
      return parent->Error("OctaboxMetrics: Failed to read subbox[%u]", i);
    }
  }
  return true;
}

bool OpenTypeGLAT_v3::GlyphAttrs::
OctaboxMetrics::SerializePart(OTSStream* out) const {
  if (!out->WriteU16(this->subbox_bitmap) ||
      !out->WriteU8(this->diag_neg_min) ||
      !out->WriteU8(this->diag_neg_max) ||
      !out->WriteU8(this->diag_pos_min) ||
      !out->WriteU8(this->diag_pos_max) ||
      !SerializeParts(this->subboxes, out)) {
    return parent->Error("OctaboxMetrics: Failed to write");
  }
  return true;
}

bool OpenTypeGLAT_v3::GlyphAttrs::OctaboxMetrics::
SubboxEntry::ParsePart(Buffer& table) {
  if (!table.ReadU8(&this->left)) {
    return parent->Error("SubboxEntry: Failed to read left");
  }
  if (!table.ReadU8(&this->right) || this->right < this->left) {
    return parent->Error("SubboxEntry: Failed to read valid right");
  }
  if (!table.ReadU8(&this->bottom)) {
    return parent->Error("SubboxEntry: Failed to read bottom");
  }
  if (!table.ReadU8(&this->top) || this->top < this->bottom) {
    return parent->Error("SubboxEntry: Failed to read valid top");
  }
  if (!table.ReadU8(&this->diag_pos_min)) {
    return parent->Error("SubboxEntry: Failed to read diag_pos_min");
  }
  if (!table.ReadU8(&this->diag_pos_max) ||
      this->diag_pos_max < this->diag_pos_min) {
    return parent->Error("SubboxEntry: Failed to read valid diag_pos_max");
  }
  if (!table.ReadU8(&this->diag_neg_min)) {
    return parent->Error("SubboxEntry: Failed to read diag_neg_min");
  }
  if (!table.ReadU8(&this->diag_neg_max) ||
      this->diag_neg_max < this->diag_neg_min) {
    return parent->Error("SubboxEntry: Failed to read valid diag_neg_max");
  }
  return true;
}

bool OpenTypeGLAT_v3::GlyphAttrs::OctaboxMetrics::
SubboxEntry::SerializePart(OTSStream* out) const {
  if (!out->WriteU8(this->left) ||
      !out->WriteU8(this->right) ||
      !out->WriteU8(this->bottom) ||
      !out->WriteU8(this->top) ||
      !out->WriteU8(this->diag_pos_min) ||
      !out->WriteU8(this->diag_pos_max) ||
      !out->WriteU8(this->diag_neg_min) ||
      !out->WriteU8(this->diag_neg_max)) {
    return parent->Error("SubboxEntry: Failed to write");
  }
  return true;
}

bool OpenTypeGLAT_v3::GlyphAttrs::
GlatEntry::ParsePart(Buffer& table) {
  if (!table.ReadS16(&this->attNum)) {
    return parent->Error("GlatEntry: Failed to read attNum");
  }
  if (!table.ReadS16(&this->num) || this->num < 0) {
    return parent->Error("GlatEntry: Failed to read valid num");
  }

  //this->attributes.resize(this->num);
  for (int i = 0; i < this->num; ++i) {
    this->attributes.emplace_back();
    if (!table.ReadS16(&this->attributes[i])) {
      return parent->Error("GlatEntry: Failed to read attribute %u", i);
    }
  }
  return true;
}

bool OpenTypeGLAT_v3::GlyphAttrs::
GlatEntry::SerializePart(OTSStream* out) const {
  if (!out->WriteS16(this->attNum) ||
      !out->WriteS16(this->num) ||
      !SerializeParts(this->attributes, out)) {
    return parent->Error("GlatEntry: Failed to write");
  }
  return true;
}

// -----------------------------------------------------------------------------
// OpenTypeGLAT
// -----------------------------------------------------------------------------

bool OpenTypeGLAT::Parse(const uint8_t* data, size_t length) {
  Buffer table(data, length);
  uint32_t version;
  if (!table.ReadU32(&version)) {
    return DropGraphite("Failed to read version");
  }
  switch (version >> 16) {
    case 1:
      this->handler = new OpenTypeGLAT_v1(this->font, this->tag);
      break;
    case 2:
      this->handler = new OpenTypeGLAT_v2(this->font, this->tag);
      break;
    case 3: {
      this->handler = new OpenTypeGLAT_v3(this->font, this->tag);
      break;
    }
    default:
      return DropGraphite("Unsupported table version: %u", version >> 16);
  }
  return this->handler->Parse(data, length);
}

bool OpenTypeGLAT::Serialize(OTSStream* out) {
  if (!this->handler) {
    return Error("No Glat table parsed");
  }
  return this->handler->Serialize(out);
}

}  // namespace ots

Coverage Report

Created: 2026-07-16 06:59

Line	Count	Source
1		// Copyright (c) 2009-2017 The OTS 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		#include "glat.h"
6
7		#include "gloc.h"
8		#include "lz4.h"
9		#include <list>
10		#include <memory>
11
12		namespace ots {
13
14		// -----------------------------------------------------------------------------
15		// OpenTypeGLAT_v1
16		// -----------------------------------------------------------------------------
17
18	282	bool OpenTypeGLAT_v1::Parse(const uint8_t* data, size_t length) {
19	282	Buffer table(data, length);
20	282	OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
21	282	GetFont()->GetTypedTable(OTS_TAG_GLOC));
22	282	if (!gloc) {
23	74	return DropGraphite("Required Gloc table is missing");
24	74	}
25
26	208	if (!table.ReadU32(&this->version) \|\| this->version >> 16 != 1) {
27	0	return DropGraphite("Failed to read version");
28	0	}
29
30	208	const std::vector<uint32_t>& locations = gloc->GetLocations();
31	208	if (locations.empty()) {
32	0	return DropGraphite("No locations from Gloc table");
33	0	}
34	208	std::list<uint32_t> unverified(locations.begin(), locations.end());
35	47.4k	while (table.remaining()) {
36	47.3k	GlatEntry entry(this);
37	47.3k	if (table.offset() > unverified.front()) {
38	39	return DropGraphite("Offset check failed for a GlatEntry");
39	39	}
40	47.3k	if (table.offset() == unverified.front()) {
41	15.8k	unverified.pop_front();
42	15.8k	}
43	47.3k	if (unverified.empty()) {
44	8	return DropGraphite("Expected more locations");
45	8	}
46	47.3k	if (!entry.ParsePart(table)) {
47	59	return DropGraphite("Failed to read a GlatEntry");
48	59	}
49	47.2k	this->entries.push_back(entry);
50	47.2k	}
51
52	102	if (unverified.size() != 1 \|\| unverified.front() != table.offset()) {
53	61	return DropGraphite("%zu location(s) could not be verified", unverified.size());
54	61	}
55	41	if (table.remaining()) {
56	0	return Warning("%zu bytes unparsed", table.remaining());
57	0	}
58	41	return true;
59	41	}
60
61	40	bool OpenTypeGLAT_v1::Serialize(OTSStream* out) {
62	40	assert(ShouldSerialize());
63	40	if (!out->WriteU32(this->version) \|\|
64	40	!SerializeParts(this->entries, out)) {
65	0	return Error("Failed to write table");
66	0	}
67	40	return true;
68	40	}
69
70	47.3k	bool OpenTypeGLAT_v1::GlatEntry::ParsePart(Buffer& table) {
71	47.3k	if (!table.ReadU8(&this->attNum)) {
72	0	return parent->Error("GlatEntry: Failed to read attNum");
73	0	}
74	47.3k	if (!table.ReadU8(&this->num)) {
75	7	return parent->Error("GlatEntry: Failed to read num");
76	7	}
77
78		//this->attributes.resize(this->num);
79	135k	for (int i = 0; i < this->num; ++i) {
80	88.5k	this->attributes.emplace_back();
81	88.5k	if (!table.ReadS16(&this->attributes[i])) {
82	52	return parent->Error("GlatEntry: Failed to read attribute %u", i);
83	52	}
84	88.5k	}
85	47.2k	return true;
86	47.2k	}
87
88	36.2k	bool OpenTypeGLAT_v1::GlatEntry::SerializePart(OTSStream* out) const {
89	36.2k	if (!out->WriteU8(this->attNum) \|\|
90	36.2k	!out->WriteU8(this->num) \|\|
91	36.2k	!SerializeParts(this->attributes, out)) {
92	0	return parent->Error("GlatEntry: Failed to write");
93	0	}
94	36.2k	return true;
95	36.2k	}
96
97		// -----------------------------------------------------------------------------
98		// OpenTypeGLAT_v2
99		// -----------------------------------------------------------------------------
100
101	87	bool OpenTypeGLAT_v2::Parse(const uint8_t* data, size_t length) {
102	87	Buffer table(data, length);
103	87	OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
104	87	GetFont()->GetTypedTable(OTS_TAG_GLOC));
105	87	if (!gloc) {
106	54	return DropGraphite("Required Gloc table is missing");
107	54	}
108
109	33	if (!table.ReadU32(&this->version) \|\| this->version >> 16 != 1) {
110	33	return DropGraphite("Failed to read version");
111	33	}
112
113	0	const std::vector<uint32_t>& locations = gloc->GetLocations();
114	0	if (locations.empty()) {
115	0	return DropGraphite("No locations from Gloc table");
116	0	}
117	0	std::list<uint32_t> unverified(locations.begin(), locations.end());
118	0	while (table.remaining()) {
119	0	GlatEntry entry(this);
120	0	if (table.offset() > unverified.front()) {
121	0	return DropGraphite("Offset check failed for a GlatEntry");
122	0	}
123	0	if (table.offset() == unverified.front()) {
124	0	unverified.pop_front();
125	0	}
126	0	if (unverified.empty()) {
127	0	return DropGraphite("Expected more locations");
128	0	}
129	0	if (!entry.ParsePart(table)) {
130	0	return DropGraphite("Failed to read a GlatEntry");
131	0	}
132	0	this->entries.push_back(entry);
133	0	}
134
135	0	if (unverified.size() != 1 \|\| unverified.front() != table.offset()) {
136	0	return DropGraphite("%zu location(s) could not be verified", unverified.size());
137	0	}
138	0	if (table.remaining()) {
139	0	return Warning("%zu bytes unparsed", table.remaining());
140	0	}
141	0	return true;
142	0	}
143
144	0	bool OpenTypeGLAT_v2::Serialize(OTSStream* out) {
145	0	assert(ShouldSerialize());
146	0	if (!out->WriteU32(this->version) \|\|
147	0	!SerializeParts(this->entries, out)) {
148	0	return Error("Failed to write table");
149	0	}
150	0	return true;
151	0	}
152
153	0	bool OpenTypeGLAT_v2::GlatEntry::ParsePart(Buffer& table) {
154	0	if (!table.ReadS16(&this->attNum)) {
155	0	return parent->Error("GlatEntry: Failed to read attNum");
156	0	}
157	0	if (!table.ReadS16(&this->num) \|\| this->num < 0) {
158	0	return parent->Error("GlatEntry: Failed to read valid num");
159	0	}
160
161		//this->attributes.resize(this->num);
162	0	for (int i = 0; i < this->num; ++i) {
163	0	this->attributes.emplace_back();
164	0	if (!table.ReadS16(&this->attributes[i])) {
165	0	return parent->Error("GlatEntry: Failed to read attribute %u", i);
166	0	}
167	0	}
168	0	return true;
169	0	}
170
171	0	bool OpenTypeGLAT_v2::GlatEntry::SerializePart(OTSStream* out) const {
172	0	if (!out->WriteS16(this->attNum) \|\|
173	0	!out->WriteS16(this->num) \|\|
174	0	!SerializeParts(this->attributes, out)) {
175	0	return parent->Error("GlatEntry: Failed to write");
176	0	}
177	0	return true;
178	0	}
179
180		// -----------------------------------------------------------------------------
181		// OpenTypeGLAT_v3
182		// -----------------------------------------------------------------------------
183
184		bool OpenTypeGLAT_v3::Parse(const uint8_t* data, size_t length,
185	893	bool prevent_decompression) {
186	893	Buffer table(data, length);
187	893	OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
188	893	GetFont()->GetTypedTable(OTS_TAG_GLOC));
189	893	if (!gloc) {
190	103	return DropGraphite("Required Gloc table is missing");
191	103	}
192
193	790	if (!table.ReadU32(&this->version) \|\| this->version >> 16 != 3) {
194	21	return DropGraphite("Failed to read version");
195	21	}
196	769	if (!table.ReadU32(&this->compHead)) {
197	10	return DropGraphite("Failed to read compression header");
198	10	}
199	759	switch ((this->compHead & SCHEME) >> 27) {
200	537	case 0: // uncompressed
201	537	break;
202	204	case 1: { // lz4
203	204	if (prevent_decompression) {
204	1	return DropGraphite("Illegal nested compression");
205	1	}
206	203	size_t decompressed_size = this->compHead & FULL_SIZE;
207	203	if (decompressed_size < length) {
208	22	return DropGraphite("Decompressed size is less than compressed size");
209	22	}
210	181	if (decompressed_size == 0) {
211	0	return DropGraphite("Decompressed size is set to 0");
212	0	}
213		// decompressed table must be <= OTS_MAX_DECOMPRESSED_TABLE_SIZE
214	181	if (decompressed_size > OTS_MAX_DECOMPRESSED_TABLE_SIZE) {
215	0	return DropGraphite("Decompressed size exceeds %gMB: %gMB",
216	0	OTS_MAX_DECOMPRESSED_TABLE_SIZE / (1024.0 * 1024.0),
217	0	decompressed_size / (1024.0 * 1024.0));
218	0	}
219	181	std::unique_ptr<uint8_t> decompressed(new uint8_t[decompressed_size]());
220	181	int ret = LZ4_decompress_safe_partial(
221	181	reinterpret_cast<const char*>(data + table.offset()),
222	181	reinterpret_cast<char*>(decompressed.get()),
223	181	table.remaining(), // input buffer size (input size + padding)
224	181	decompressed_size, // target output size
225	181	decompressed_size); // output buffer size
226	181	if (ret < 0 \|\| unsigned(ret) != decompressed_size) {
227	135	return DropGraphite("Decompression failed with error code %d", ret);
228	135	}
229	46	return this->Parse(decompressed.get(), decompressed_size, true);
230	181	}
231	18	default:
232	18	return DropGraphite("Unknown compression scheme");
233	759	}
234	537	if (this->compHead & RESERVED) {
235	468	Warning("Nonzero reserved");
236	468	}
237
238	537	const std::vector<uint32_t>& locations = gloc->GetLocations();
239	537	if (locations.empty()) {
240	0	return DropGraphite("No locations from Gloc table");
241	0	}
242	537	std::list<uint32_t> unverified(locations.begin(), locations.end());
243		//this->entries.resize(locations.size() - 1, this);
244	8.51k	for (size_t i = 0; i < locations.size() - 1; ++i) {
245	8.43k	this->entries.emplace_back(this);
246	8.43k	if (table.offset() != unverified.front()) {
247	49	return DropGraphite("Offset check failed for a GlyphAttrs");
248	49	}
249	8.38k	unverified.pop_front();
250	8.38k	if (!this->entries[i].ParsePart(table,
251	8.38k	unverified.front() - table.offset())) {
252		// unverified.front() is guaranteed to exist because of the number of
253		// iterations of this loop
254	409	return DropGraphite("Failed to read a GlyphAttrs");
255	409	}
256	8.38k	}
257
258	79	if (unverified.size() != 1 \|\| unverified.front() != table.offset()) {
259	23	return DropGraphite("%zu location(s) could not be verified", unverified.size());
260	23	}
261	56	if (table.remaining()) {
262	40	return Warning("%zu bytes unparsed", table.remaining());
263	40	}
264	16	return true;
265	56	}
266
267	55	bool OpenTypeGLAT_v3::Serialize(OTSStream* out) {
268	55	assert(ShouldSerialize());
269	55	if (!out->WriteU32(this->version) \|\|
270	55	!out->WriteU32(this->compHead) \|\|
271	55	!SerializeParts(this->entries, out)) {
272	0	return Error("Failed to write table");
273	0	}
274	55	return true;
275	55	}
276
277	8.38k	bool OpenTypeGLAT_v3::GlyphAttrs::ParsePart(Buffer& table, const size_t size) {
278	8.38k	size_t init_offset = table.offset();
279	8.38k	if (parent->compHead & OCTABOXES && !octabox.ParsePart(table)) {
280		// parent->flags & 0b1: octaboxes are present flag
281	319	return parent->Error("GlyphAttrs: Failed to read octabox");
282	319	}
283
284	39.7k	while (table.offset() < init_offset + size) {
285	31.7k	GlatEntry entry(parent);
286	31.7k	if (!entry.ParsePart(table)) {
287	90	return parent->Error("GlyphAttrs: Failed to read a GlatEntry");
288	90	}
289	31.6k	this->entries.push_back(entry);
290	31.6k	}
291	7.97k	return true;
292	8.06k	}
293
294	3.22k	bool OpenTypeGLAT_v3::GlyphAttrs::SerializePart(OTSStream* out) const {
295	3.22k	if ((parent->compHead & OCTABOXES && !octabox.SerializePart(out)) \|\|
296	3.22k	!SerializeParts(this->entries, out)) {
297	0	return parent->Error("GlyphAttrs: Failed to write");
298	0	}
299	3.22k	return true;
300	3.22k	}
301
302		bool OpenTypeGLAT_v3::GlyphAttrs::
303	8.27k	OctaboxMetrics::ParsePart(Buffer& table) {
304	8.27k	if (!table.ReadU16(&this->subbox_bitmap)) {
305	14	return parent->Error("OctaboxMetrics: Failed to read subbox_bitmap");
306	14	}
307	8.25k	if (!table.ReadU8(&this->diag_neg_min)) {
308	18	return parent->Error("OctaboxMetrics: Failed to read diag_neg_min");
309	18	}
310	8.24k	if (!table.ReadU8(&this->diag_neg_max) \|\|
311	8.22k	this->diag_neg_max < this->diag_neg_min) {
312	34	return parent->Error("OctaboxMetrics: Failed to read valid diag_neg_max");
313	34	}
314	8.20k	if (!table.ReadU8(&this->diag_pos_min)) {
315	13	return parent->Error("OctaboxMetrics: Failed to read diag_pos_min");
316	13	}
317	8.19k	if (!table.ReadU8(&this->diag_pos_max) \|\|
318	8.17k	this->diag_pos_max < this->diag_pos_min) {
319	35	return parent->Error("OctaboxMetrics: Failed to read valid diag_pos_max");
320	35	}
321
322	8.15k	unsigned subboxes_len = 0; // count of 1's in this->subbox_bitmap
323	40.1k	for (uint16_t i = this->subbox_bitmap; i; i >>= 1) {
324	31.9k	if (i & 0b1) {
325	21.2k	++subboxes_len;
326	21.2k	}
327	31.9k	}
328		//this->subboxes.resize(subboxes_len, parent);
329	27.7k	for (unsigned i = 0; i < subboxes_len; i++) {
330	19.7k	this->subboxes.emplace_back(parent);
331	19.7k	if (!this->subboxes[i].ParsePart(table)) {
332	205	return parent->Error("OctaboxMetrics: Failed to read subbox[%u]", i);
333	205	}
334	19.7k	}
335	7.95k	return true;
336	8.15k	}
337
338		bool OpenTypeGLAT_v3::GlyphAttrs::
339	3.20k	OctaboxMetrics::SerializePart(OTSStream* out) const {
340	3.20k	if (!out->WriteU16(this->subbox_bitmap) \|\|
341	3.20k	!out->WriteU8(this->diag_neg_min) \|\|
342	3.20k	!out->WriteU8(this->diag_neg_max) \|\|
343	3.20k	!out->WriteU8(this->diag_pos_min) \|\|
344	3.20k	!out->WriteU8(this->diag_pos_max) \|\|
345	3.20k	!SerializeParts(this->subboxes, out)) {
346	0	return parent->Error("OctaboxMetrics: Failed to write");
347	0	}
348	3.20k	return true;
349	3.20k	}
350
351		bool OpenTypeGLAT_v3::GlyphAttrs::OctaboxMetrics::
352	19.7k	SubboxEntry::ParsePart(Buffer& table) {
353	19.7k	if (!table.ReadU8(&this->left)) {
354	15	return parent->Error("SubboxEntry: Failed to read left");
355	15	}
356	19.7k	if (!table.ReadU8(&this->right) \|\| this->right < this->left) {
357	50	return parent->Error("SubboxEntry: Failed to read valid right");
358	50	}
359	19.7k	if (!table.ReadU8(&this->bottom)) {
360	10	return parent->Error("SubboxEntry: Failed to read bottom");
361	10	}
362	19.6k	if (!table.ReadU8(&this->top) \|\| this->top < this->bottom) {
363	28	return parent->Error("SubboxEntry: Failed to read valid top");
364	28	}
365	19.6k	if (!table.ReadU8(&this->diag_pos_min)) {
366	19	return parent->Error("SubboxEntry: Failed to read diag_pos_min");
367	19	}
368	19.6k	if (!table.ReadU8(&this->diag_pos_max) \|\|
369	19.6k	this->diag_pos_max < this->diag_pos_min) {
370	36	return parent->Error("SubboxEntry: Failed to read valid diag_pos_max");
371	36	}
372	19.6k	if (!table.ReadU8(&this->diag_neg_min)) {
373	21	return parent->Error("SubboxEntry: Failed to read diag_neg_min");
374	21	}
375	19.5k	if (!table.ReadU8(&this->diag_neg_max) \|\|
376	19.5k	this->diag_neg_max < this->diag_neg_min) {
377	26	return parent->Error("SubboxEntry: Failed to read valid diag_neg_max");
378	26	}
379	19.5k	return true;
380	19.5k	}
381
382		bool OpenTypeGLAT_v3::GlyphAttrs::OctaboxMetrics::
383	10.7k	SubboxEntry::SerializePart(OTSStream* out) const {
384	10.7k	if (!out->WriteU8(this->left) \|\|
385	10.7k	!out->WriteU8(this->right) \|\|
386	10.7k	!out->WriteU8(this->bottom) \|\|
387	10.7k	!out->WriteU8(this->top) \|\|
388	10.7k	!out->WriteU8(this->diag_pos_min) \|\|
389	10.7k	!out->WriteU8(this->diag_pos_max) \|\|
390	10.7k	!out->WriteU8(this->diag_neg_min) \|\|
391	10.7k	!out->WriteU8(this->diag_neg_max)) {
392	0	return parent->Error("SubboxEntry: Failed to write");
393	0	}
394	10.7k	return true;
395	10.7k	}
396
397		bool OpenTypeGLAT_v3::GlyphAttrs::
398	31.7k	GlatEntry::ParsePart(Buffer& table) {
399	31.7k	if (!table.ReadS16(&this->attNum)) {
400	17	return parent->Error("GlatEntry: Failed to read attNum");
401	17	}
402	31.7k	if (!table.ReadS16(&this->num) \|\| this->num < 0) {
403	43	return parent->Error("GlatEntry: Failed to read valid num");
404	43	}
405
406		//this->attributes.resize(this->num);
407	180k	for (int i = 0; i < this->num; ++i) {
408	148k	this->attributes.emplace_back();
409	148k	if (!table.ReadS16(&this->attributes[i])) {
410	30	return parent->Error("GlatEntry: Failed to read attribute %u", i);
411	30	}
412	148k	}
413	31.6k	return true;
414	31.6k	}
415
416		bool OpenTypeGLAT_v3::GlyphAttrs::
417	14.6k	GlatEntry::SerializePart(OTSStream* out) const {
418	14.6k	if (!out->WriteS16(this->attNum) \|\|
419	14.6k	!out->WriteS16(this->num) \|\|
420	14.6k	!SerializeParts(this->attributes, out)) {
421	0	return parent->Error("GlatEntry: Failed to write");
422	0	}
423	14.6k	return true;
424	14.6k	}
425
426		// -----------------------------------------------------------------------------
427		// OpenTypeGLAT
428		// -----------------------------------------------------------------------------
429
430	1.76k	bool OpenTypeGLAT::Parse(const uint8_t* data, size_t length) {
431	1.76k	Buffer table(data, length);
432	1.76k	uint32_t version;
433	1.76k	if (!table.ReadU32(&version)) {
434	238	return DropGraphite("Failed to read version");
435	238	}
436	1.52k	switch (version >> 16) {
437	282	case 1:
438	282	this->handler = new OpenTypeGLAT_v1(this->font, this->tag);
439	282	break;
440	87	case 2:
441	87	this->handler = new OpenTypeGLAT_v2(this->font, this->tag);
442	87	break;
443	847	case 3: {
444	847	this->handler = new OpenTypeGLAT_v3(this->font, this->tag);
445	847	break;
446	0	}
447	308	default:
448	308	return DropGraphite("Unsupported table version: %u", version >> 16);
449	1.52k	}
450	1.21k	return this->handler->Parse(data, length);
451	1.52k	}
452
453	95	bool OpenTypeGLAT::Serialize(OTSStream* out) {
454	95	if (!this->handler) {
455	0	return Error("No Glat table parsed");
456	0	}
457	95	return this->handler->Serialize(out);
458	95	}
459
460		} // namespace ots