1 files changed, 137 insertions, 0 deletions
diff --git a/components/favicon_base/fallback_icon_url_parser.cc b/components/favicon_base/fallback_icon_url_parser.cc
new file mode 100644
index 0000000..ba9f2321
--- /dev/null
+++ b/components/favicon_base/fallback_icon_url_parser.cc
@@ -0,0 +1,137 @@
+// 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::SplitStringDontTrim(specs_str, ',', &tokens);
+  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;
+
+  if (!tokens[1].empty() && !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