1 files changed, 364 insertions, 0 deletions
diff --git a/gfx/ots/src/ots.h b/gfx/ots/src/ots.h
new file mode 100644
index 0000000000..434e068d48
--- /dev/null
+++ b/gfx/ots/src/ots.h
@@ -0,0 +1,364 @@
+// 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.
+
+#ifndef OTS_H_
+#define OTS_H_
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stddef.h>
+#include <cstdarg>
+#include <cstddef>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <limits>
+#include <map>
+
+#include "opentype-sanitiser.h"
+
+// arraysize borrowed from base/basictypes.h
+template <typename T, size_t N>
+char (&ArraySizeHelper(T (&array)[N]))[N];
+#define arraysize(array) (sizeof(ArraySizeHelper(array)))
+
+namespace ots {
+
+#if !defined(OTS_DEBUG)
+#define OTS_FAILURE() false
+#else
+#define OTS_FAILURE() \
+  (\
+    std::fprintf(stderr, "ERROR at %s:%d (%s)\n", \
+                 __FILE__, __LINE__, __FUNCTION__) \
+    && false\
+  )
+#endif
+
+// All OTS_FAILURE_* macros ultimately evaluate to 'false', just like the original
+// message-less OTS_FAILURE(), so that the current parser will return 'false' as
+// its result (indicating a failure).
+
+#if !defined(OTS_DEBUG)
+#define OTS_MESSAGE_(level,otf_,...) \
+  (otf_)->context->Message(level,__VA_ARGS__)
+#else
+#define OTS_MESSAGE_(level,otf_,...) \
+  OTS_FAILURE(), \
+  (otf_)->context->Message(level,__VA_ARGS__)
+#endif
+
+// Generate a simple message
+#define OTS_FAILURE_MSG_(otf_,...) \
+  (OTS_MESSAGE_(0,otf_,__VA_ARGS__), false)
+
+#define OTS_WARNING_MSG_(otf_,...) \
+  OTS_MESSAGE_(1,otf_,__VA_ARGS__)
+
+// Convenience macros for use in files that only handle a single table tag,
+// defined as TABLE_NAME at the top of the file; the 'file' variable is
+// expected to be the current FontFile pointer.
+#define OTS_FAILURE_MSG(...) OTS_FAILURE_MSG_(font->file, TABLE_NAME ": " __VA_ARGS__)
+
+#define OTS_WARNING(...) OTS_WARNING_MSG_(font->file, TABLE_NAME ": " __VA_ARGS__)
+
+// -----------------------------------------------------------------------------
+// Buffer helper class
+//
+// This class perform some trival buffer operations while checking for
+// out-of-bounds errors. As a family they return false if anything is amiss,
+// updating the current offset otherwise.
+// -----------------------------------------------------------------------------
+class Buffer {
+ public:
+  Buffer(const uint8_t *buf, size_t len)
+      : buffer_(buf),
+        length_(len),
+        offset_(0) { }
+
+  bool Skip(size_t n_bytes) {
+    return Read(NULL, n_bytes);
+  }
+
+  bool Read(uint8_t *buf, size_t n_bytes) {
+    if (n_bytes > 1024 * 1024 * 1024) {
+      return OTS_FAILURE();
+    }
+    if ((offset_ + n_bytes > length_) ||
+        (offset_ > length_ - n_bytes)) {
+      return OTS_FAILURE();
+    }
+    if (buf) {
+      std::memcpy(buf, buffer_ + offset_, n_bytes);
+    }
+    offset_ += n_bytes;
+    return true;
+  }
+
+  inline bool ReadU8(uint8_t *value) {
+    if (offset_ + 1 > length_) {
+      return OTS_FAILURE();
+    }
+    *value = buffer_[offset_];
+    ++offset_;
+    return true;
+  }
+
+  bool ReadU16(uint16_t *value) {
+    if (offset_ + 2 > length_) {
+      return OTS_FAILURE();
+    }
+    std::memcpy(value, buffer_ + offset_, sizeof(uint16_t));
+    *value = ots_ntohs(*value);
+    offset_ += 2;
+    return true;
+  }
+
+  bool ReadS16(int16_t *value) {
+    return ReadU16(reinterpret_cast<uint16_t*>(value));
+  }
+
+  bool ReadU24(uint32_t *value) {
+    if (offset_ + 3 > length_) {
+      return OTS_FAILURE();
+    }
+    *value = static_cast<uint32_t>(buffer_[offset_]) << 16 |
+        static_cast<uint32_t>(buffer_[offset_ + 1]) << 8 |
+        static_cast<uint32_t>(buffer_[offset_ + 2]);
+    offset_ += 3;
+    return true;
+  }
+
+  bool ReadU32(uint32_t *value) {
+    if (offset_ + 4 > length_) {
+      return OTS_FAILURE();
+    }
+    std::memcpy(value, buffer_ + offset_, sizeof(uint32_t));
+    *value = ots_ntohl(*value);
+    offset_ += 4;
+    return true;
+  }
+
+  bool ReadS32(int32_t *value) {
+    return ReadU32(reinterpret_cast<uint32_t*>(value));
+  }
+
+  bool ReadR64(uint64_t *value) {
+    if (offset_ + 8 > length_) {
+      return OTS_FAILURE();
+    }
+    std::memcpy(value, buffer_ + offset_, sizeof(uint64_t));
+    offset_ += 8;
+    return true;
+  }
+
+  const uint8_t *buffer() const { return buffer_; }
+  size_t offset() const { return offset_; }
+  size_t length() const { return length_; }
+  size_t remaining() const { return length_ - offset_; }
+
+  void set_offset(size_t newoffset) { offset_ = newoffset; }
+
+ private:
+  const uint8_t * const buffer_;
+  const size_t length_;
+  size_t offset_;
+};
+
+// Round a value up to the nearest multiple of 4. Don't round the value in the
+// case that rounding up overflows.
+template<typename T> T Round4(T value) {
+  if (std::numeric_limits<T>::max() - value < 3) {
+    return value;
+  }
+  return (value + 3) & ~3;
+}
+
+template<typename T> T Round2(T value) {
+  if (value == std::numeric_limits<T>::max()) {
+    return value;
+  }
+  return (value + 1) & ~1;
+}
+
+// Check that a tag consists entirely of printable ASCII characters
+bool CheckTag(uint32_t tag_value);
+
+#define OTS_TAG_CFF  OTS_TAG('C','F','F',' ')
+#define OTS_TAG_CFF2 OTS_TAG('C','F','F','2')
+#define OTS_TAG_CMAP OTS_TAG('c','m','a','p')
+#define OTS_TAG_COLR OTS_TAG('C','O','L','R')
+#define OTS_TAG_CPAL OTS_TAG('C','P','A','L')
+#define OTS_TAG_CVT  OTS_TAG('c','v','t',' ')
+#define OTS_TAG_FEAT OTS_TAG('F','e','a','t')
+#define OTS_TAG_FPGM OTS_TAG('f','p','g','m')
+#define OTS_TAG_GASP OTS_TAG('g','a','s','p')
+#define OTS_TAG_GDEF OTS_TAG('G','D','E','F')
+#define OTS_TAG_GLAT OTS_TAG('G','l','a','t')
+#define OTS_TAG_GLOC OTS_TAG('G','l','o','c')
+#define OTS_TAG_GLYF OTS_TAG('g','l','y','f')
+#define OTS_TAG_GPOS OTS_TAG('G','P','O','S')
+#define OTS_TAG_GSUB OTS_TAG('G','S','U','B')
+#define OTS_TAG_HDMX OTS_TAG('h','d','m','x')
+#define OTS_TAG_HEAD OTS_TAG('h','e','a','d')
+#define OTS_TAG_HHEA OTS_TAG('h','h','e','a')
+#define OTS_TAG_HMTX OTS_TAG('h','m','t','x')
+#define OTS_TAG_KERN OTS_TAG('k','e','r','n')
+#define OTS_TAG_LOCA OTS_TAG('l','o','c','a')
+#define OTS_TAG_LTSH OTS_TAG('L','T','S','H')
+#define OTS_TAG_MATH OTS_TAG('M','A','T','H')
+#define OTS_TAG_MAXP OTS_TAG('m','a','x','p')
+#define OTS_TAG_NAME OTS_TAG('n','a','m','e')
+#define OTS_TAG_OS2  OTS_TAG('O','S','/','2')
+#define OTS_TAG_POST OTS_TAG('p','o','s','t')
+#define OTS_TAG_PREP OTS_TAG('p','r','e','p')
+#define OTS_TAG_SILE OTS_TAG('S','i','l','e')
+#define OTS_TAG_SILF OTS_TAG('S','i','l','f')
+#define OTS_TAG_SILL OTS_TAG('S','i','l','l')
+#define OTS_TAG_VDMX OTS_TAG('V','D','M','X')
+#define OTS_TAG_VHEA OTS_TAG('v','h','e','a')
+#define OTS_TAG_VMTX OTS_TAG('v','m','t','x')
+#define OTS_TAG_VORG OTS_TAG('V','O','R','G')
+
+#define OTS_TAG_AVAR OTS_TAG('a','v','a','r')
+#define OTS_TAG_CVAR OTS_TAG('c','v','a','r')
+#define OTS_TAG_FVAR OTS_TAG('f','v','a','r')
+#define OTS_TAG_GVAR OTS_TAG('g','v','a','r')
+#define OTS_TAG_HVAR OTS_TAG('H','V','A','R')
+#define OTS_TAG_MVAR OTS_TAG('M','V','A','R')
+#define OTS_TAG_VVAR OTS_TAG('V','V','A','R')
+#define OTS_TAG_STAT OTS_TAG('S','T','A','T')
+
+// See https://github.com/khaledhosny/ots/issues/219
+#define OTS_MAX_DECOMPRESSED_FILE_SIZE 300 * 1024 * 1024
+#define OTS_MAX_DECOMPRESSED_TABLE_SIZE 150 * 1024 * 1024
+
+struct Font;
+struct FontFile;
+struct TableEntry;
+struct Arena;
+
+class Table {
+ public:
+  explicit Table(Font *font, uint32_t tag, uint32_t type)
+      : m_tag(tag),
+        m_type(type),
+        m_font(font),
+        m_shouldSerialize(true) {
+  }
+
+  virtual ~Table() { }
+
+  virtual bool Parse(const uint8_t *data, size_t length) = 0;
+  virtual bool Serialize(OTSStream *out) = 0;
+  virtual bool ShouldSerialize();
+
+  // Return the tag (table type) this Table was parsed as, to support
+  // "poor man's RTTI" so that we know if we can safely down-cast to
+  // a specific Table subclass. The m_type field is initialized to the
+  // appropriate tag when a subclass is constructed, or to zero for
+  // TablePassthru (indicating unparsed data).
+  uint32_t Type() { return m_type; }
+
+  // Return the tag assigned when this table was constructed.
+  uint32_t Tag() { return m_tag; }
+
+  Font* GetFont() { return m_font; }
+
+  bool Error(const char *format, ...);
+  bool Warning(const char *format, ...);
+  bool Drop(const char *format, ...);
+  bool DropGraphite(const char *format, ...);
+  bool DropVariations(const char *format, ...);
+
+ private:
+  void Message(int level, const char *format, va_list va);
+
+  uint32_t m_tag;
+  uint32_t m_type;
+  Font *m_font;
+  bool m_shouldSerialize;
+};
+
+class TablePassthru : public Table {
+ public:
+  explicit TablePassthru(Font *font, uint32_t tag)
+      : Table(font, tag, 0),
+        m_data(NULL),
+        m_length(0) {
+  }
+
+  bool Parse(const uint8_t *data, size_t length);
+  bool Serialize(OTSStream *out);
+
+ private:
+  const uint8_t *m_data;
+  size_t m_length;
+};
+
+struct Font {
+  explicit Font(FontFile *f)
+      : file(f),
+        version(0),
+        num_tables(0),
+        search_range(0),
+        entry_selector(0),
+        range_shift(0) {
+  }
+
+  bool ParseTable(const TableEntry& tableinfo, const uint8_t* data,
+                  Arena &arena);
+  Table* GetTable(uint32_t tag) const;
+
+  // This checks that the returned Table is actually of the correct subclass
+  // for |tag|, so it can safely be downcast to the corresponding OpenTypeXXXX;
+  // if not (i.e. if the table was treated as Passthru), it will return NULL.
+  Table* GetTypedTable(uint32_t tag) const;
+
+  // Insert a new table. Asserts if a table with the same tag already exists.
+  void AddTable(TableEntry entry, Table* table);
+
+  // Drop all Graphite tables and don't parse new ones.
+  void DropGraphite();
+
+  // Drop all Variations tables and don't parse new ones.
+  void DropVariations();
+
+  FontFile *file;
+
+  uint32_t version;
+  uint16_t num_tables;
+  uint16_t search_range;
+  uint16_t entry_selector;
+  uint16_t range_shift;
+
+ private:
+  std::map<uint32_t, Table*> m_tables;
+};
+
+struct TableEntry {
+  uint32_t tag;
+  uint32_t offset;
+  uint32_t length;
+  uint32_t uncompressed_length;
+  uint32_t chksum;
+
+  bool operator<(const TableEntry& other) const {
+    return tag < other.tag;
+  }
+};
+
+struct FontFile {
+  ~FontFile();
+
+  OTSContext *context;
+  std::map<TableEntry, Table*> tables;
+  std::map<uint32_t, TableEntry> table_entries;
+};
+
+}  // namespace ots
+
+#endif  // OTS_H_