1 files changed, 294 insertions, 0 deletions
diff --git a/gfx/ots/src/ots.h b/gfx/ots/src/ots.h
new file mode 100644
index 0000000000..2d13f8d6d2
--- /dev/null
+++ b/gfx/ots/src/ots.h
@@ -0,0 +1,294 @@
+// Copyright (c) 2009 The Chromium 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_
+
+#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__)
+
+// Generate a message with an associated table tag
+#define OTS_FAILURE_MSG_TAG_(otf_,msg_,tag_) \
+  (OTS_MESSAGE_(0,otf_,"%c%c%c%c: %s", OTS_UNTAG(tag_), msg_), false)
+
+// 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 OpenTypeFile 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 = 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 = 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;
+}
+
+bool IsValidVersionTag(uint32_t tag);
+
+#define FOR_EACH_TABLE_TYPE \
+  F(cff, CFF) \
+  F(cmap, CMAP) \
+  F(cvt, CVT) \
+  F(fpgm, FPGM) \
+  F(gasp, GASP) \
+  F(gdef, GDEF) \
+  F(glyf, GLYF) \
+  F(gpos, GPOS) \
+  F(gsub, GSUB) \
+  F(hdmx, HDMX) \
+  F(head, HEAD) \
+  F(hhea, HHEA) \
+  F(hmtx, HMTX) \
+  F(kern, KERN) \
+  F(loca, LOCA) \
+  F(ltsh, LTSH) \
+  F(math, MATH) \
+  F(maxp, MAXP) \
+  F(name, NAME) \
+  F(os2, OS2) \
+  F(post, POST) \
+  F(prep, PREP) \
+  F(vdmx, VDMX) \
+  F(vorg, VORG) \
+  F(vhea, VHEA) \
+  F(vmtx, VMTX)
+
+#define F(name, capname) struct OpenType##capname;
+FOR_EACH_TABLE_TYPE
+#undef F
+
+struct Font;
+struct OpenTypeFile;
+
+#define F(name, capname) \
+bool ots_##name##_parse(Font *f, const uint8_t *d, size_t l); \
+bool ots_##name##_should_serialise(Font *f); \
+bool ots_##name##_serialise(OTSStream *s, Font *f); \
+void ots_##name##_reuse(Font *f, Font *o);\
+void ots_##name##_free(Font *f);
+FOR_EACH_TABLE_TYPE
+#undef F
+
+struct Font {
+  explicit Font(const OpenTypeFile *f)
+      : file(f),
+        version(0),
+        num_tables(0),
+        search_range(0),
+        entry_selector(0),
+        range_shift(0) {
+#define F(name, capname) \
+    name = NULL; \
+    name##_reused = false;
+    FOR_EACH_TABLE_TYPE
+#undef F
+  }
+
+  ~Font() {
+#define F(name, capname) \
+    if (!name##_reused) {\
+      ots_##name##_free(this); \
+    }
+    FOR_EACH_TABLE_TYPE
+#undef F
+  }
+
+  const OpenTypeFile *file;
+
+  uint32_t version;
+  uint16_t num_tables;
+  uint16_t search_range;
+  uint16_t entry_selector;
+  uint16_t range_shift;
+
+#define F(name, capname) \
+  OpenType##capname *name; \
+  bool name##_reused;
+FOR_EACH_TABLE_TYPE
+#undef F
+};
+
+struct OutputTable {
+  uint32_t tag;
+  size_t offset;
+  size_t length;
+  uint32_t chksum;
+
+  bool operator<(const OutputTable& other) const {
+    return tag < other.tag;
+  }
+};
+
+typedef std::map<uint32_t, std::pair<Font*, OutputTable> > TableMap;
+
+struct OpenTypeFile {
+  OTSContext *context;
+  TableMap tables;
+};
+
+}  // namespace ots
+
+#undef FOR_EACH_TABLE_TYPE
+
+#endif  // OTS_H_