Updating OTS repo from https://github.com/khaledhosny/ots.git

third_party/ots/include/opentype-sanitiser.h

+// 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 OPENTYPE_SANITISER_H_
+#define OPENTYPE_SANITISER_H_
+
+#if defined(_WIN32)
+#include <stdlib.h>
+typedef signed char int8_t;
+typedef unsigned char uint8_t;
+typedef short int16_t;
+typedef unsigned short uint16_t;
+typedef int int32_t;
+typedef unsigned int uint32_t;
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+#define ntohl(x) _byteswap_ulong (x)
+#define ntohs(x) _byteswap_ushort (x)
+#define htonl(x) _byteswap_ulong (x)
+#define htons(x) _byteswap_ushort (x)
+#else
+#include <arpa/inet.h>
+#include <stdint.h>
+#endif
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
+
+namespace ots {
+
+// -----------------------------------------------------------------------------
+// This is an interface for an abstract stream class which is used for writing
+// the serialised results out.
+// -----------------------------------------------------------------------------
+class OTSStream {
+ public:
+  OTSStream() {
+    ResetChecksum();
+  }
+
+  virtual ~OTSStream() {}
+
+  // This should be implemented to perform the actual write.
+  virtual bool WriteRaw(const void *data, size_t length) = 0;
+
+  bool Write(const void *data, size_t length) {
+    if (!length) return false;
+
+    const size_t orig_length = length;
+    size_t offset = 0;
+    if (chksum_buffer_offset_) {
+      const size_t l =
+        std::min(length, static_cast<size_t>(4) - chksum_buffer_offset_);
+      std::memcpy(chksum_buffer_ + chksum_buffer_offset_, data, l);
+      chksum_buffer_offset_ += l;
+      offset += l;
+      length -= l;
+    }
+
+    if (chksum_buffer_offset_ == 4) {
+      uint32_t tmp;
+      std::memcpy(&tmp, chksum_buffer_, 4);
+      chksum_ += ntohl(tmp);
+      chksum_buffer_offset_ = 0;
+    }
+
+    while (length >= 4) {
+      uint32_t tmp;
+      std::memcpy(&tmp, reinterpret_cast<const uint8_t *>(data) + offset,
+        sizeof(uint32_t));
+      chksum_ += ntohl(tmp);
+      length -= 4;
+      offset += 4;
+    }
+
+    if (length) {
+      if (chksum_buffer_offset_ != 0) return false;  // not reached
+      if (length > 4) return false;  // not reached
+      std::memcpy(chksum_buffer_,
+             reinterpret_cast<const uint8_t*>(data) + offset, length);
+      chksum_buffer_offset_ = length;
+    }
+
+    return WriteRaw(data, orig_length);
+  }
+
+  virtual bool Seek(off_t position) = 0;
+  virtual off_t Tell() const = 0;
+
+  virtual bool Pad(size_t bytes) {
+    static const uint32_t kZero = 0;
+    while (bytes >= 4) {
+      if (!WriteTag(kZero)) return false;
+      bytes -= 4;
+    }
+    while (bytes) {
+      static const uint8_t kZerob = 0;
+      if (!Write(&kZerob, 1)) return false;
+      bytes--;
+    }
+    return true;
+  }
+
+  bool WriteU8(uint8_t v) {
+    return Write(&v, sizeof(v));
+  }
+
+  bool WriteU16(uint16_t v) {
+    v = htons(v);
+    return Write(&v, sizeof(v));
+  }
+
+  bool WriteS16(int16_t v) {
+    v = htons(v);
+    return Write(&v, sizeof(v));
+  }
+
+  bool WriteU24(uint32_t v) {
+    v = htonl(v);
+    return Write(reinterpret_cast<uint8_t*>(&v)+1, 3);
+  }
+
+  bool WriteU32(uint32_t v) {
+    v = htonl(v);
+    return Write(&v, sizeof(v));
+  }
+
+  bool WriteS32(int32_t v) {
+    v = htonl(v);
+    return Write(&v, sizeof(v));
+  }
+
+  bool WriteR64(uint64_t v) {
+    return Write(&v, sizeof(v));
+  }
+
+  bool WriteTag(uint32_t v) {
+    return Write(&v, sizeof(v));
+  }
+
+  void ResetChecksum() {
+    chksum_ = 0;
+    chksum_buffer_offset_ = 0;
+  }
+
+  uint32_t chksum() const {
+    assert(chksum_buffer_offset_ == 0);
+    return chksum_;
+  }
+
+  struct ChecksumState {
+    uint32_t chksum;
+    uint8_t chksum_buffer[4];
+    unsigned chksum_buffer_offset;
+  };
+
+  ChecksumState SaveChecksumState() const {
+    ChecksumState s;
+    s.chksum = chksum_;
+    s.chksum_buffer_offset = chksum_buffer_offset_;
+    std::memcpy(s.chksum_buffer, chksum_buffer_, 4);
+
+    return s;
+  }
+
+  void RestoreChecksum(const ChecksumState &s) {
+    assert(chksum_buffer_offset_ == 0);
+    chksum_ += s.chksum;
+    chksum_buffer_offset_ = s.chksum_buffer_offset;
+    std::memcpy(chksum_buffer_, s.chksum_buffer, 4);
+  }
+
+ protected:
+  uint32_t chksum_;
+  uint8_t chksum_buffer_[4];
+  unsigned chksum_buffer_offset_;
+};
+
+#ifdef __GCC__
+#define MSGFUNC_FMT_ATTR __attribute__((format(printf, 2, 3)))
+#else
+#define MSGFUNC_FMT_ATTR
+#endif
+
+enum TableAction {
+  TABLE_ACTION_DEFAULT,  // Use OTS's default action for that table
+  TABLE_ACTION_SANITIZE, // Sanitize the table, potentially droping it
+  TABLE_ACTION_PASSTHRU, // Serialize the table unchanged
+  TABLE_ACTION_DROP      // Drop the table
+};
+
+class OTSContext {
+  public:
+    OTSContext() {}
+    virtual ~OTSContext() {}
+
+    // Process a given OpenType file and write out a sanitised version
+    //   output: a pointer to an object implementing the OTSStream interface. The
+    //     sanitisied output will be written to this. In the even of a failure,
+    //     partial output may have been written.
+    //   input: the OpenType file
+    //   length: the size, in bytes, of |input|
+    //   context: optional context that holds various OTS settings like user callbacks
+    bool Process(OTSStream *output, const uint8_t *input, size_t length);
+
+    // This function will be called when OTS is reporting an error.
+    //   level: the severity of the generated message:
+    //     0: error messages in case OTS fails to sanitize the font.
+    //     1: warning messages about issue OTS fixed in the sanitized font.
+    virtual void Message(int level, const char *format, ...) MSGFUNC_FMT_ATTR {}
+
+    // This function will be called when OTS needs to decide what to do for a
+    // font table.
+    //   tag: table tag as an integer in big-endian byte order, independent of
+    //   platform endianness
+    virtual TableAction GetTableAction(uint32_t tag) { return ots::TABLE_ACTION_DEFAULT; }
+};
+
+// For backward compatibility - remove once Chrome switches over to the new API.
+bool Process(OTSStream *output, const uint8_t *input, size_t length);
+
+// For backward compatibility - remove once https://codereview.chromium.org/774253008/
+// is submitted.
+void EnableWOFF2();
+
+}  // namespace ots
+
+#endif  // OPENTYPE_SANITISER_H_