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

third_party/ots/test/idempotent.cc

Index: third_party/ots/test/idempotent.cc
diff --git a/third_party/ots/test/idempotent.cc b/third_party/ots/test/idempotent.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ec50ab44bd4726526d22263f50431caaa5e7c98a
--- /dev/null
+++ b/third_party/ots/test/idempotent.cc
@@ -0,0 +1,219 @@
+// 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.
+
+#if !defined(_WIN32)
+#ifdef __linux__
+// Linux
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_OUTLINE_H
+#else
+// Mac OS X
+#include <ApplicationServices/ApplicationServices.h>  // g++ -framework Cocoa
+#endif  // __linux__
+#include <unistd.h>
+#else
+// Windows
+#include <io.h>
+#include <Windows.h>
+#endif  // !defiend(_WIN32)
+
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+#include "opentype-sanitiser.h"
+#include "ots-memory-stream.h"
+
+namespace {
+
+int Usage(const char *argv0) {
+  std::fprintf(stderr, "Usage: %s <ttf file>\n", argv0);
+  return 1;
+}
+
+bool ReadFile(const char *file_name, uint8_t **data, size_t *file_size);
+bool DumpResults(const uint8_t *result1, const size_t len1,
+                 const uint8_t *result2, const size_t len2);
+
+#if defined(_WIN32)
+#define ADDITIONAL_OPEN_FLAGS O_BINARY
+#else
+#define ADDITIONAL_OPEN_FLAGS 0
+#endif
+
+bool ReadFile(const char *file_name, uint8_t **data, size_t *file_size) {
+  const int fd = open(file_name, O_RDONLY | ADDITIONAL_OPEN_FLAGS);
+  if (fd < 0) {
+    return false;
+  }
+
+  struct stat st;
+  fstat(fd, &st);
+
+  *file_size = st.st_size;
+  *data = new uint8_t[st.st_size];
+  if (read(fd, *data, st.st_size) != st.st_size) {
+    close(fd);
+    return false;
+  }
+  close(fd);
+  return true;
+}
+
+bool DumpResults(const uint8_t *result1, const size_t len1,
+                 const uint8_t *result2, const size_t len2) {
+  int fd1 = open("out1.ttf",
+                 O_WRONLY | O_CREAT | O_TRUNC | ADDITIONAL_OPEN_FLAGS, 0600);
+  int fd2 = open("out2.ttf",
+                 O_WRONLY | O_CREAT | O_TRUNC | ADDITIONAL_OPEN_FLAGS, 0600);
+  if (fd1 < 0 || fd2 < 0) {
+    perror("opening output file");
+    return false;
+  }
+  if ((write(fd1, result1, len1) < 0) ||
+      (write(fd2, result2, len2) < 0)) {
+    perror("writing output file");
+    close(fd1);
+    close(fd2);
+    return false;
+  }
+  close(fd1);
+  close(fd2);
+  return true;
+}
+
+// Platform specific implementations.
+bool VerifyTranscodedFont(uint8_t *result, const size_t len);
+
+#if defined(__linux__)
+// Linux
+bool VerifyTranscodedFont(uint8_t *result, const size_t len) {
+  FT_Library library;
+  FT_Error error = ::FT_Init_FreeType(&library);
+  if (error) {
+    return false;
+  }
+  FT_Face dummy;
+  error = ::FT_New_Memory_Face(library, result, len, 0, &dummy);
+  if (error) {
+    return false;
+  }
+  ::FT_Done_Face(dummy);
+  return true;
+}
+
+#elif defined(__APPLE_CC__)
+// Mac
+bool VerifyTranscodedFont(uint8_t *result, const size_t len) {
+  CFDataRef data = CFDataCreate(0, result, len);
+  if (!data) {
+    return false;
+  }
+
+  CGDataProviderRef dataProvider = CGDataProviderCreateWithCFData(data);
+  CGFontRef cgFontRef = CGFontCreateWithDataProvider(dataProvider);
+  CGDataProviderRelease(dataProvider);
+  CFRelease(data);
+  if (!cgFontRef) {
+    return false;
+  }
+
+  size_t numGlyphs = CGFontGetNumberOfGlyphs(cgFontRef);
+  CGFontRelease(cgFontRef);
+  if (!numGlyphs) {
+    return false;
+  }
+  return true;
+}
+
+#elif defined(_WIN32)
+// Windows
+bool VerifyTranscodedFont(uint8_t *result, const size_t len) {
+  DWORD num_fonts = 0;
+  HANDLE handle = AddFontMemResourceEx(result, len, 0, &num_fonts);
+  if (!handle) {
+    return false;
+  }
+  RemoveFontMemResourceEx(handle);
+  return true;
+}
+
+#else
+bool VerifyTranscodedFont(uint8_t *result, const size_t len) {
+  std::fprintf(stderr, "Can't verify the transcoded font on this platform.\n");
+  return false;
+}
+
+#endif
+
+}  // namespace
+
+int main(int argc, char **argv) {
+  if (argc != 2) return Usage(argv[0]);
+
+  size_t file_size = 0;
+  uint8_t *data = 0;
+  if (!ReadFile(argv[1], &data, &file_size)) {
+    std::fprintf(stderr, "Failed to read file!\n");
+    return 1;
+  }
+
+  // A transcoded font is usually smaller than an original font.
+  // However, it can be slightly bigger than the original one due to
+  // name table replacement and/or padding for glyf table.
+  //
+  // However, a WOFF font gets decompressed and so can be *much* larger than
+  // the original.
+  uint8_t *result = new uint8_t[file_size * 8];
+  ots::MemoryStream output(result, file_size * 8);
+
+  ots::OTSContext context;
+
+  bool r = context.Process(&output, data, file_size);
+  if (!r) {
+    std::fprintf(stderr, "Failed to sanitise file!\n");
+    return 1;
+  }
+  const size_t result_len = output.Tell();
+  delete[] data;
+
+  uint8_t *result2 = new uint8_t[result_len];
+  ots::MemoryStream output2(result2, result_len);
+  r = context.Process(&output2, result, result_len);
+  if (!r) {
+    std::fprintf(stderr, "Failed to sanitise previous output!\n");
+    return 1;
+  }
+  const size_t result2_len = output2.Tell();
+
+  bool dump_results = false;
+  if (result2_len != result_len) {
+    std::fprintf(stderr, "Outputs differ in length\n");
+    dump_results = true;
+  } else if (std::memcmp(result2, result, result_len)) {
+    std::fprintf(stderr, "Outputs differ in content\n");
+    dump_results = true;
+  }
+
+  if (dump_results) {
+    std::fprintf(stderr, "Dumping results to out1.tff and out2.tff\n");
+    if (!DumpResults(result, result_len, result2, result2_len)) {
+      std::fprintf(stderr, "Failed to dump output files.\n");
+      return 1;
+    }
+  }
+
+  // Verify that the transcoded font can be opened by the font renderer for
+  // Linux (FreeType2), Mac OS X, or Windows.
+  if (!VerifyTranscodedFont(result, result_len)) {
+    std::fprintf(stderr, "Failed to verify the transcoded font\n");
+    return 1;
+  }
+
+  return 0;
+}