Delete unused chrome://fallback-icon/ handling

components/favicon_base/fallback_icon_url_parser.cc

-// Copyright 2015 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 "components/favicon_base/fallback_icon_url_parser.h"
-
-#include <algorithm>
-
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_split.h"
-#include "base/strings/string_util.h"
-#include "third_party/skia/include/utils/SkParse.h"
-#include "ui/gfx/favicon_size.h"
-
-namespace {
-
-// List of sizes corresponding to RGB, ARGB, RRGGBB, AARRGGBB.
-const size_t kValidHexColorSizes[] = {3, 4, 6, 8};
-
-// Returns whether |color_str| is a valid CSS color in hex format if we prepend
-// '#', i.e., whether |color_str| matches /^[0-9A-Fa-f]{3,4,6,8}$/.
-bool IsHexColorString(const std::string& color_str) {
-  size_t len = color_str.length();
-  const size_t* end = kValidHexColorSizes + arraysize(kValidHexColorSizes);
-  if (std::find(kValidHexColorSizes, end, len) == end)
-    return false;
-  for (auto ch : color_str) {
-    if (!base::IsHexDigit(ch))
-      return false;
-  }
-  return true;
-}
-
-}  // namespace
-
-namespace chrome {
-
-ParsedFallbackIconPath::ParsedFallbackIconPath()
-    : size_in_pixels_(gfx::kFaviconSize) {
-}
-
-ParsedFallbackIconPath::~ParsedFallbackIconPath() {
-}
-
-bool ParsedFallbackIconPath::Parse(const std::string& path) {
-  if (path.empty())
-    return false;
-
-  size_t slash = path.find("/", 0);
-  if (slash == std::string::npos)
-    return false;
-  std::string spec_str = path.substr(0, slash);
-  if (!ParseSpecs(spec_str, &size_in_pixels_, &style_))
-    return false;  // Parse failed.
-
-  // Need to store the index of the URL field, so Instant Extended can translate
-  // fallback icon URLs using advanced parameters.
-  // Example:
-  //   "chrome-search://fallback-icon/48/<renderer-id>/<most-visited-id>"
-  // would be translated to:
-  //   "chrome-search://fallback-icon/48/<most-visited-item-with-given-id>".
-  path_index_ = slash + 1;
-  url_string_ = path.substr(path_index_);
-  return true;
-}
-
-// static
-bool ParsedFallbackIconPath::ParseSpecs(
-    const std::string& specs_str,
-    int *size,
-    favicon_base::FallbackIconStyle* style) {
-  DCHECK(size);
-  DCHECK(style);
-
-  std::vector<std::string> tokens = base::SplitString(
-      specs_str, ",", base::KEEP_WHITESPACE, base::SPLIT_WANT_ALL);
-  if (tokens.size() != 5)  // Force "," for empty fields.
-    return false;
-
-  *size = gfx::kFaviconSize;
-  if (!tokens[0].empty() && !base::StringToInt(tokens[0], size))
-    return false;
-  if (*size <= 0)
-    return false;
-
-  *style = favicon_base::FallbackIconStyle();
-
-  if (!tokens[1].empty()) {
-    style->is_default_background_color = false;
-    if (!ParseColor(tokens[1], &style->background_color))
-      return false;
-  }
-
-  if (tokens[2].empty())
-    favicon_base::MatchFallbackIconTextColorAgainstBackgroundColor(style);
-  else if (!ParseColor(tokens[2], &style->text_color))
-    return false;
-
-  if (!tokens[3].empty() &&
-      !base::StringToDouble(tokens[3], &style->font_size_ratio))
-    return false;
-
-  if (!tokens[4].empty() && !base::StringToDouble(tokens[4], &style->roundness))
-    return false;
-
-  return favicon_base::ValidateFallbackIconStyle(*style);
-}
-
-// static
-bool ParsedFallbackIconPath::ParseColor(const std::string& color_str,
-                                        SkColor* color) {
-  DCHECK(color);
-  // Exclude the empty case. Also disallow the '#' prefix, since we want color
-  // to be part of an URL, but in URL '#' is used for ref fragment.
-  if (color_str.empty() || color_str[0] == '#')
-    return false;
-
-  // If a valid color hex string is given, prepend '#' and parse (always works).
-  // This is unambiguous since named color never only use leters 'a' to 'f'.
-  if (IsHexColorString(color_str)) {
-    // Default alpha to 0xFF since FindColor() preserves unspecified alpha.
-    *color = SK_ColorWHITE;
-    // Need temp variable to avoid use-after-free of returned pointer.
-    std::string color_str_with_hash = "#" + color_str;
-    const char* end = SkParse::FindColor(color_str_with_hash.c_str(), color);
-    DCHECK(end && !*end);  // Call should succeed and consume string.
-    return true;
-  }
-
-  // Default alpha to 0xFF.
-  SkColor temp_color = SK_ColorWHITE;
-  const char* end = SkParse::FindColor(color_str.c_str(), &temp_color);
-  if (end && !*end) {  // Successful if call succeeds and string is consumed.
-    *color = temp_color;
-    return true;
-  }
-  return false;
-}
-
-}  // namespace chrome