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

third_party/ots/src/glyf.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 "glyf.h"
-
-#include <algorithm>
-#include <limits>
-
-#include "head.h"
-#include "loca.h"
-#include "maxp.h"
-
-// glyf - Glyph Data
-// http://www.microsoft.com/typography/otspec/glyf.htm
-
-#define TABLE_NAME "glyf"
-
-namespace {
-
-bool ParseFlagsForSimpleGlyph(ots::OpenTypeFile *file,
-                              ots::Buffer *table,
-                              uint32_t gly_length,
-                              uint32_t num_flags,
-                              uint32_t *flags_count_logical,
-                              uint32_t *flags_count_physical,
-                              uint32_t *xy_coordinates_length) {
-  uint8_t flag = 0;
-  if (!table->ReadU8(&flag)) {
-    return OTS_FAILURE_MSG("Can't read flag");
-  }
-
-  uint32_t delta = 0;
-  if (flag & (1u << 1)) {  // x-Short
-    ++delta;
-  } else if (!(flag & (1u << 4))) {
-    delta += 2;
-  }
-
-  if (flag & (1u << 2)) {  // y-Short
-    ++delta;
-  } else if (!(flag & (1u << 5))) {
-    delta += 2;
-  }
-
-  if (flag & (1u << 3)) {  // repeat
-    if (*flags_count_logical + 1 >= num_flags) {
-      return OTS_FAILURE_MSG("Count too high (%d + 1 >= %d)", *flags_count_logical, num_flags);
-    }
-    uint8_t repeat = 0;
-    if (!table->ReadU8(&repeat)) {
-      return OTS_FAILURE_MSG("Can't read repeat value");
-    }
-    if (repeat == 0) {
-      return OTS_FAILURE_MSG("Zero repeat");
-    }
-    delta += (delta * repeat);
-
-    *flags_count_logical += repeat;
-    if (*flags_count_logical >= num_flags) {
-      return OTS_FAILURE_MSG("Count too high (%d >= %d)", *flags_count_logical, num_flags);
-    }
-    ++(*flags_count_physical);
-  }
-
-  if ((flag & (1u << 6)) || (flag & (1u << 7))) {  // reserved flags
-    return OTS_FAILURE_MSG("Bad flag value (%d)", flag);
-  }
-
-  *xy_coordinates_length += delta;
-  if (gly_length < *xy_coordinates_length) {
-    return OTS_FAILURE_MSG("Glyph coordinates length too low (%d < %d)", gly_length, *xy_coordinates_length);
-  }
-
-  return true;
-}
-
-bool ParseSimpleGlyph(ots::OpenTypeFile *file, const uint8_t *data,
-                      ots::Buffer *table, int16_t num_contours,
-                      uint32_t gly_offset, uint32_t gly_length,
-                      uint32_t *new_size) {
-  ots::OpenTypeGLYF *glyf = file->glyf;
-
-  // read the end-points array
-  uint16_t num_flags = 0;
-  for (int i = 0; i < num_contours; ++i) {
-    uint16_t tmp_index = 0;
-    if (!table->ReadU16(&tmp_index)) {
-      return OTS_FAILURE_MSG("Can't read contour index %d", i);
-    }
-    if (tmp_index == 0xffffu) {
-      return OTS_FAILURE_MSG("Bad contour index %d", i);
-    }
-    // check if the indices are monotonically increasing
-    if (i && (tmp_index + 1 <= num_flags)) {
-      return OTS_FAILURE_MSG("Decreasing contour index %d + 1 <= %d", tmp_index, num_flags);
-    }
-    num_flags = tmp_index + 1;
-  }
-
-  uint16_t bytecode_length = 0;
-  if (!table->ReadU16(&bytecode_length)) {
-    return OTS_FAILURE_MSG("Can't read bytecode length");
-  }
-  if ((file->maxp->version_1) &&
-      (file->maxp->max_size_glyf_instructions < bytecode_length)) {
-    return OTS_FAILURE_MSG("Bytecode length too high %d", bytecode_length);
-  }
-
-  const uint32_t gly_header_length = 10 + num_contours * 2 + 2;
-  if (gly_length < (gly_header_length + bytecode_length)) {
-    return OTS_FAILURE_MSG("Glyph header length too high %d", gly_header_length);
-  }
-
-  glyf->iov.push_back(std::make_pair(
-      data + gly_offset,
-      static_cast<size_t>(gly_header_length + bytecode_length)));
-
-  if (!table->Skip(bytecode_length)) {
-    return OTS_FAILURE_MSG("Can't skip bytecode of length %d", bytecode_length);
-  }
-
-  uint32_t flags_count_physical = 0;  // on memory
-  uint32_t xy_coordinates_length = 0;
-  for (uint32_t flags_count_logical = 0;
-       flags_count_logical < num_flags;
-       ++flags_count_logical, ++flags_count_physical) {
-    if (!ParseFlagsForSimpleGlyph(file,
-                                  table,
-                                  gly_length,
-                                  num_flags,
-                                  &flags_count_logical,
-                                  &flags_count_physical,
-                                  &xy_coordinates_length)) {
-      return OTS_FAILURE_MSG("Failed to parse glyph flags %d", flags_count_logical);
-    }
-  }
-
-  if (gly_length < (gly_header_length + bytecode_length +
-                    flags_count_physical + xy_coordinates_length)) {
-    return OTS_FAILURE_MSG("Glyph too short %d", gly_length);
-  }
-
-  if (gly_length - (gly_header_length + bytecode_length +
-                    flags_count_physical + xy_coordinates_length) > 3) {
-    // We allow 0-3 bytes difference since gly_length is 4-bytes aligned,
-    // zero-padded length.
-    return OTS_FAILURE_MSG("Invalid glyph length %d", gly_length);
-  }
-
-  glyf->iov.push_back(std::make_pair(
-      data + gly_offset + gly_header_length + bytecode_length,
-      static_cast<size_t>(flags_count_physical + xy_coordinates_length)));
-
-  *new_size
-      = gly_header_length + flags_count_physical + xy_coordinates_length + bytecode_length;
-
-  return true;
-}
-
-}  // namespace
-
-namespace ots {
-
-bool ots_glyf_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
-  Buffer table(data, length);
-
-  if (!file->maxp || !file->loca || !file->head) {
-    return OTS_FAILURE_MSG("Missing maxp or loca or head table needed by glyf table");
-  }
-
-  OpenTypeGLYF *glyf = new OpenTypeGLYF;
-  file->glyf = glyf;
-
-  const unsigned num_glyphs = file->maxp->num_glyphs;
-  std::vector<uint32_t> &offsets = file->loca->offsets;
-
-  if (offsets.size() != num_glyphs + 1) {
-    return OTS_FAILURE_MSG("Invalide glyph offsets size %ld != %d", offsets.size(), num_glyphs + 1);
-  }
-
-  std::vector<uint32_t> resulting_offsets(num_glyphs + 1);
-  uint32_t current_offset = 0;
-
-  for (unsigned i = 0; i < num_glyphs; ++i) {
-    const unsigned gly_offset = offsets[i];
-    // The LOCA parser checks that these values are monotonic
-    const unsigned gly_length = offsets[i + 1] - offsets[i];
-    if (!gly_length) {
-      // this glyph has no outline (e.g. the space charactor)
-      resulting_offsets[i] = current_offset;
-      continue;
-    }
-
-    if (gly_offset >= length) {
-      return OTS_FAILURE_MSG("Glyph %d offset %d too high %ld", i, gly_offset, length);
-    }
-    // Since these are unsigned types, the compiler is not allowed to assume
-    // that they never overflow.
-    if (gly_offset + gly_length < gly_offset) {
-      return OTS_FAILURE_MSG("Glyph %d length (%d < 0)!", i, gly_length);
-    }
-    if (gly_offset + gly_length > length) {
-      return OTS_FAILURE_MSG("Glyph %d length %d too high", i, gly_length);
-    }
-
-    table.set_offset(gly_offset);
-    int16_t num_contours, xmin, ymin, xmax, ymax;
-    if (!table.ReadS16(&num_contours) ||
-        !table.ReadS16(&xmin) ||
-        !table.ReadS16(&ymin) ||
-        !table.ReadS16(&xmax) ||
-        !table.ReadS16(&ymax)) {
-      return OTS_FAILURE_MSG("Can't read glyph %d header", i);
-    }
-
-    if (num_contours <= -2) {
-      // -2, -3, -4, ... are reserved for future use.
-      return OTS_FAILURE_MSG("Bad number of contours %d in glyph %d", num_contours, i);
-    }
-
-    // workaround for fonts in http://www.princexml.com/fonts/
-    if ((xmin == 32767) &&
-        (xmax == -32767) &&
-        (ymin == 32767) &&
-        (ymax == -32767)) {
-      OTS_WARNING("bad xmin/xmax/ymin/ymax values");
-      xmin = xmax = ymin = ymax = 0;
-    }
-
-    if (xmin > xmax || ymin > ymax) {
-      return OTS_FAILURE_MSG("Bad bounding box values bl=(%d, %d), tr=(%d, %d) in glyph %d", xmin, ymin, xmax, ymax, i);
-    }
-
-    unsigned new_size = 0;
-    if (num_contours >= 0) {
-      // this is a simple glyph and might contain bytecode
-      if (!ParseSimpleGlyph(file, data, &table,
-                            num_contours, gly_offset, gly_length, &new_size)) {
-        return OTS_FAILURE_MSG("Failed to parse glyph %d", i);
-      }
-    } else {
-      // it's a composite glyph without any bytecode. Enqueue the whole thing
-      glyf->iov.push_back(std::make_pair(data + gly_offset,
-                                         static_cast<size_t>(gly_length)));
-      new_size = gly_length;
-    }
-
-    resulting_offsets[i] = current_offset;
-    // glyphs must be four byte aligned
-    // TODO(yusukes): investigate whether this padding is really necessary.
-    //                Which part of the spec requires this?
-    const unsigned padding = (4 - (new_size & 3)) % 4;
-    if (padding) {
-      glyf->iov.push_back(std::make_pair(
-          reinterpret_cast<const uint8_t*>("\x00\x00\x00\x00"),
-          static_cast<size_t>(padding)));
-      new_size += padding;
-    }
-    current_offset += new_size;
-  }
-  resulting_offsets[num_glyphs] = current_offset;
-
-  const uint16_t max16 = std::numeric_limits<uint16_t>::max();
-  if ((*std::max_element(resulting_offsets.begin(),
-                         resulting_offsets.end()) >= (max16 * 2u)) &&
-      (file->head->index_to_loc_format != 1)) {
-    OTS_WARNING("2-bytes indexing is not possible (due to the padding above)");
-    file->head->index_to_loc_format = 1;
-  }
-
-  file->loca->offsets = resulting_offsets;
-  return true;
-}
-
-bool ots_glyf_should_serialise(OpenTypeFile *file) {
-  return file->glyf != NULL;
-}
-
-bool ots_glyf_serialise(OTSStream *out, OpenTypeFile *file) {
-  const OpenTypeGLYF *glyf = file->glyf;
-
-  for (unsigned i = 0; i < glyf->iov.size(); ++i) {
-    if (!out->Write(glyf->iov[i].first, glyf->iov[i].second)) {
-      return OTS_FAILURE_MSG("Falied to write glyph %d", i);
-    }
-  }
-
-  return true;
-}
-
-void ots_glyf_free(OpenTypeFile *file) {
-  delete file->glyf;
-}
-
-}  // namespace ots
-
-#undef TABLE_NAME