| // Copyright (c) 2012 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 "chrome/installer/util/channel_info.h" |
| |
| #include <stddef.h> |
| |
| #include "base/logging.h" |
| #include "base/macros.h" |
| #include "base/win/registry.h" |
| #include "chrome/installer/util/google_update_constants.h" |
| #include "chrome/installer/util/util_constants.h" |
| |
| using base::win::RegKey; |
| |
| namespace { |
| |
| const wchar_t kModChrome[] = L"-chrome"; |
| const wchar_t kModChromeFrame[] = L"-chromeframe"; |
| const wchar_t kModAppHostDeprecated[] = L"-apphost"; |
| const wchar_t kModAppLauncherDeprecated[] = L"-applauncher"; |
| const wchar_t kModMultiInstall[] = L"-multi"; |
| const wchar_t kModReadyMode[] = L"-readymode"; |
| const wchar_t kModStage[] = L"-stage:"; |
| const wchar_t kModStatsDefault[] = L"-statsdef_"; |
| const wchar_t kSfxFull[] = L"-full"; |
| const wchar_t kSfxMigrating[] = L"-migrating"; |
| const wchar_t kSfxMultiFail[] = L"-multifail"; |
| |
| const wchar_t* const kModifiers[] = { |
| kModStatsDefault, |
| kModStage, |
| kModMultiInstall, |
| kModChrome, |
| kModChromeFrame, |
| kModAppHostDeprecated, |
| kModAppLauncherDeprecated, |
| kModReadyMode, |
| kSfxMultiFail, |
| kSfxMigrating, |
| kSfxFull, |
| }; |
| |
| enum ModifierIndex { |
| MOD_STATS_DEFAULT, |
| MOD_STAGE, |
| MOD_MULTI_INSTALL, |
| MOD_CHROME, |
| MOD_CHROME_FRAME, |
| MOD_APP_HOST_DEPRECATED, |
| MOD_APP_LAUNCHER_DEPRECATED, |
| MOD_READY_MODE, |
| SFX_MULTI_FAIL, |
| SFX_MIGRATING, |
| SFX_FULL, |
| NUM_MODIFIERS |
| }; |
| |
| static_assert(NUM_MODIFIERS == arraysize(kModifiers), |
| "kModifiers disagrees with ModifierIndex; they must match!"); |
| |
| // Returns true if the modifier is found, in which case |position| holds the |
| // location at which the modifier was found. The number of characters in the |
| // modifier is returned in |length|, if non-NULL. |
| bool FindModifier(ModifierIndex index, |
| const base::string16& ap_value, |
| base::string16::size_type* position, |
| base::string16::size_type* length) { |
| DCHECK(position != NULL); |
| base::string16::size_type mod_position = base::string16::npos; |
| base::string16::size_type mod_length = |
| base::string16::traits_type::length(kModifiers[index]); |
| char last_char = kModifiers[index][mod_length - 1]; |
| const bool mod_takes_arg = (last_char == L':' || last_char == L'_'); |
| base::string16::size_type pos = 0; |
| do { |
| mod_position = ap_value.find(kModifiers[index], pos, mod_length); |
| if (mod_position == base::string16::npos) |
| return false; // Modifier not found. |
| pos = mod_position + mod_length; |
| // Modifiers that take an argument gobble up to the next separator or to the |
| // end. |
| if (mod_takes_arg) { |
| pos = ap_value.find(L'-', pos); |
| if (pos == base::string16::npos) |
| pos = ap_value.size(); |
| break; |
| } |
| // Regular modifiers must be followed by '-' or the end of the string. |
| } while (pos != ap_value.size() && ap_value[pos] != L'-'); |
| DCHECK_NE(mod_position, base::string16::npos); |
| *position = mod_position; |
| if (length != NULL) |
| *length = pos - mod_position; |
| return true; |
| } |
| |
| bool HasModifier(ModifierIndex index, const base::string16& ap_value) { |
| DCHECK(index >= 0 && index < NUM_MODIFIERS); |
| base::string16::size_type position; |
| return FindModifier(index, ap_value, &position, NULL); |
| } |
| |
| base::string16::size_type FindInsertionPoint(ModifierIndex index, |
| const base::string16& ap_value) { |
| // Return the location of the next modifier. |
| base::string16::size_type result; |
| |
| for (int scan = index + 1; scan < NUM_MODIFIERS; ++scan) { |
| if (FindModifier(static_cast<ModifierIndex>(scan), ap_value, &result, NULL)) |
| return result; |
| } |
| |
| return ap_value.size(); |
| } |
| |
| // Returns true if |ap_value| is modified. |
| bool SetModifier(ModifierIndex index, bool set, base::string16* ap_value) { |
| DCHECK(index >= 0 && index < NUM_MODIFIERS); |
| DCHECK(ap_value); |
| base::string16::size_type position; |
| base::string16::size_type length; |
| bool have_modifier = FindModifier(index, *ap_value, &position, &length); |
| if (set) { |
| if (!have_modifier) { |
| ap_value->insert(FindInsertionPoint(index, *ap_value), kModifiers[index]); |
| return true; |
| } |
| } else { |
| if (have_modifier) { |
| ap_value->erase(position, length); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| // Returns the value of a modifier - that is for a modifier of the form |
| // "-foo:bar", returns "bar". Returns an empty string if the modifier |
| // is not present or does not have a value. |
| base::string16 GetModifierValue(ModifierIndex modifier_index, |
| const base::string16& value) { |
| base::string16::size_type position; |
| base::string16::size_type length; |
| |
| if (FindModifier(modifier_index, value, &position, &length)) { |
| // Return the portion after the prefix. |
| base::string16::size_type pfx_length = |
| base::string16::traits_type::length(kModifiers[modifier_index]); |
| DCHECK_LE(pfx_length, length); |
| return value.substr(position + pfx_length, length - pfx_length); |
| } |
| return base::string16(); |
| } |
| |
| } // namespace |
| |
| namespace installer { |
| |
| bool ChannelInfo::Initialize(const RegKey& key) { |
| LONG result = key.ReadValue(google_update::kRegApField, &value_); |
| return result == ERROR_SUCCESS || result == ERROR_FILE_NOT_FOUND || |
| result == ERROR_INVALID_HANDLE; |
| } |
| |
| bool ChannelInfo::Write(RegKey* key) const { |
| DCHECK(key); |
| // Google Update deletes the value when it is empty, so we may as well, too. |
| LONG result = value_.empty() ? |
| key->DeleteValue(google_update::kRegApField) : |
| key->WriteValue(google_update::kRegApField, value_.c_str()); |
| if (result != ERROR_SUCCESS) { |
| LOG(ERROR) << "Failed writing channel info; result: " << result; |
| return false; |
| } |
| return true; |
| } |
| |
| bool ChannelInfo::IsChrome() const { |
| return HasModifier(MOD_CHROME, value_); |
| } |
| |
| bool ChannelInfo::SetChrome(bool value) { |
| return SetModifier(MOD_CHROME, value, &value_); |
| } |
| |
| bool ChannelInfo::IsChromeFrame() const { |
| return HasModifier(MOD_CHROME_FRAME, value_); |
| } |
| |
| bool ChannelInfo::SetChromeFrame(bool value) { |
| return SetModifier(MOD_CHROME_FRAME, value, &value_); |
| } |
| |
| bool ChannelInfo::IsAppLauncher() const { |
| return HasModifier(MOD_APP_LAUNCHER_DEPRECATED, value_); |
| } |
| |
| bool ChannelInfo::SetAppLauncher(bool value) { |
| // Unconditionally remove -apphost since it has been long deprecated. |
| bool changed_app_host = SetModifier(MOD_APP_HOST_DEPRECATED, false, &value_); |
| // Set value for -applauncher, relying on caller for policy. |
| bool changed_app_launcher = |
| SetModifier(MOD_APP_LAUNCHER_DEPRECATED, value, &value_); |
| return changed_app_host || changed_app_launcher; |
| } |
| |
| bool ChannelInfo::IsMultiInstall() const { |
| return HasModifier(MOD_MULTI_INSTALL, value_); |
| } |
| |
| bool ChannelInfo::SetMultiInstall(bool value) { |
| return SetModifier(MOD_MULTI_INSTALL, value, &value_); |
| } |
| |
| bool ChannelInfo::IsReadyMode() const { |
| return HasModifier(MOD_READY_MODE, value_); |
| } |
| |
| bool ChannelInfo::SetReadyMode(bool value) { |
| return SetModifier(MOD_READY_MODE, value, &value_); |
| } |
| |
| bool ChannelInfo::ClearStage() { |
| base::string16::size_type position; |
| base::string16::size_type length; |
| if (FindModifier(MOD_STAGE, value_, &position, &length)) { |
| value_.erase(position, length); |
| return true; |
| } |
| return false; |
| } |
| |
| base::string16 ChannelInfo::GetStatsDefault() const { |
| return GetModifierValue(MOD_STATS_DEFAULT, value_); |
| } |
| |
| bool ChannelInfo::HasFullSuffix() const { |
| return HasModifier(SFX_FULL, value_); |
| } |
| |
| bool ChannelInfo::SetFullSuffix(bool value) { |
| return SetModifier(SFX_FULL, value, &value_); |
| } |
| |
| bool ChannelInfo::HasMultiFailSuffix() const { |
| return HasModifier(SFX_MULTI_FAIL, value_); |
| } |
| |
| bool ChannelInfo::SetMultiFailSuffix(bool value) { |
| return SetModifier(SFX_MULTI_FAIL, value, &value_); |
| } |
| |
| bool ChannelInfo::SetMigratingSuffix(bool value) { |
| return SetModifier(SFX_MIGRATING, value, &value_); |
| } |
| |
| bool ChannelInfo::HasMigratingSuffix() const { |
| return HasModifier(SFX_MIGRATING, value_); |
| } |
| |
| bool ChannelInfo::RemoveAllModifiersAndSuffixes() { |
| bool modified = false; |
| |
| for (int scan = 0; scan < NUM_MODIFIERS; ++scan) { |
| ModifierIndex index = static_cast<ModifierIndex>(scan); |
| modified = SetModifier(index, false, &value_) || modified; |
| } |
| |
| return modified; |
| } |
| |
| } // namespace installer |