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

third_party/ots/src/loca.cc

-// 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.
-
-#include "loca.h"
-
-#include "head.h"
-#include "maxp.h"
-
-// loca - Index to Location
-// http://www.microsoft.com/typography/otspec/loca.htm
-
-#define TABLE_NAME "loca"
-
-namespace ots {
-
-bool ots_loca_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
-  Buffer table(data, length);
-
-  // We can't do anything useful in validating this data except to ensure that
-  // the values are monotonically increasing.
-
-  OpenTypeLOCA *loca = new OpenTypeLOCA;
-  file->loca = loca;
-
-  if (!file->maxp || !file->head) {
-    return OTS_FAILURE_MSG("maxp or head tables missing from font, needed by loca");
-  }
-
-  const unsigned num_glyphs = file->maxp->num_glyphs;
-  unsigned last_offset = 0;
-  loca->offsets.resize(num_glyphs + 1);
-  // maxp->num_glyphs is uint16_t, thus the addition never overflows.
-
-  if (file->head->index_to_loc_format == 0) {
-    // Note that the <= here (and below) is correct. There is one more offset
-    // than the number of glyphs in order to give the length of the final
-    // glyph.
-    for (unsigned i = 0; i <= num_glyphs; ++i) {
-      uint16_t offset = 0;
-      if (!table.ReadU16(&offset)) {
-        return OTS_FAILURE_MSG("Failed to read offset for glyph %d", i);
-      }
-      if (offset < last_offset) {
-        return OTS_FAILURE_MSG("Out of order offset %d < %d for glyph %d", offset, last_offset, i);
-      }
-      last_offset = offset;
-      loca->offsets[i] = offset * 2;
-    }
-  } else {
-    for (unsigned i = 0; i <= num_glyphs; ++i) {
-      uint32_t offset = 0;
-      if (!table.ReadU32(&offset)) {
-        return OTS_FAILURE_MSG("Failed to read offset for glyph %d", i);
-      }
-      if (offset < last_offset) {
-        return OTS_FAILURE_MSG("Out of order offset %d < %d for glyph %d", offset, last_offset, i);
-      }
-      last_offset = offset;
-      loca->offsets[i] = offset;
-    }
-  }
-
-  return true;
-}
-
-bool ots_loca_should_serialise(OpenTypeFile *file) {
-  return file->loca != NULL;
-}
-
-bool ots_loca_serialise(OTSStream *out, OpenTypeFile *file) {
-  const OpenTypeLOCA *loca = file->loca;
-  const OpenTypeHEAD *head = file->head;
-
-  if (!head) {
-    return OTS_FAILURE_MSG("Missing head table in font needed by loca");
-  }
-
-  if (head->index_to_loc_format == 0) {
-    for (unsigned i = 0; i < loca->offsets.size(); ++i) {
-      const uint16_t offset = static_cast<uint16_t>(loca->offsets[i] >> 1);
-      if ((offset != (loca->offsets[i] >> 1)) ||
-          !out->WriteU16(offset)) {
-        return OTS_FAILURE_MSG("Failed to write glyph offset for glyph %d", i);
-      }
-    }
-  } else {
-    for (unsigned i = 0; i < loca->offsets.size(); ++i) {
-      if (!out->WriteU32(loca->offsets[i])) {
-        return OTS_FAILURE_MSG("Failed to write glyph offset for glyph %d", i);
-      }
-    }
-  }
-
-  return true;
-}
-
-void ots_loca_free(OpenTypeFile *file) {
-  delete file->loca;
-}
-
-}  // namespace ots
-
-#undef TABLE_NAME