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// Copyright (c) 2008 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.
// This command-line program dumps the contents of a set of cache files, either
// to stdout or to another set of cache files.
#include <stdio.h>
#include <string>
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/process_util.h"
#include "base/scoped_handle.h"
#include "base/string_util.h"
#include "net/disk_cache/disk_format.h"
enum Errors {
GENERIC = -1,
ALL_GOOD = 0,
INVALID_ARGUMENT = 1,
FILE_ACCESS_ERROR,
UNKNOWN_VERSION,
TOOL_NOT_FOUND,
};
int GetMajorVersion(const std::wstring input_path);
int DumpContents(const std::wstring input_path);
int DumpHeaders(const std::wstring input_path);
int RunSlave(const std::wstring input_path, const std::wstring pipe_number);
int Upgrade(const std::wstring output_path, HANDLE pipe);
HANDLE CreateServer(std::wstring* pipe_number);
const char kUpgradeHelp[] =
"\nIn order to use the upgrade function, a version of this tool that\n"
"understands the file format of the files to upgrade is needed. For\n"
"instance, to upgrade files saved with file format 3.4 to version 5.2,\n"
"a version of this program that was compiled with version 3.4 has to be\n"
"located beside this executable, and named dump_cache_3.exe, and this\n"
"executable should be compiled with version 5.2 being the current one.";
// Folders to read and write cache files.
const wchar_t kInputPath[] = L"input";
const wchar_t kOutputPath[] = L"output";
// Dumps the file headers to stdout.
const wchar_t kDumpHeaders[] = L"dump-headers";
// Dumps all entries to stdout.
const wchar_t kDumpContents[] = L"dump-contents";
// Upgrade an old version to the current one.
const wchar_t kUpgrade[] = L"upgrade";
// Internal use:
const wchar_t kSlave[] = L"slave";
const wchar_t kPipe[] = L"pipe";
int Help() {
printf("warning: input files are modified by this tool\n");
printf("dump_cache --input=path1 [--output=path2]\n");
printf("--dump-headers: display file headers\n");
printf("--dump-contents: display all entries\n");
printf("--upgrade: copy contents to the output path\n");
return INVALID_ARGUMENT;
}
// Starts a new process, to generate the files.
int LaunchSlave(const CommandLine& command_line, const std::wstring pipe_number,
int version) {
// TODO(port): remove this string-munging hackery.
std::wstring hacked_command_line = command_line.command_line_string();
const std::wstring old_exe(L"dump_cache.exe");
size_t to_remove = hacked_command_line.find(old_exe);
hacked_command_line.erase(to_remove, old_exe.size());
std::wstring new_program = StringPrintf(L"%ls%d.exe", L"dump_cache_",
version);
hacked_command_line.insert(to_remove, new_program);
CommandLine new_command_line(L"");
new_command_line.ParseFromString(hacked_command_line);
if (command_line.HasSwitch(kUpgrade))
new_command_line.AppendSwitch(kSlave);
new_command_line.AppendSwitchWithValue(kPipe, pipe_number);
if (!base::LaunchApp(new_command_line, false, false, NULL)) {
printf("Unable to launch the needed version of this tool: %ls\n",
new_program.c_str());
printf(kUpgradeHelp);
return TOOL_NOT_FOUND;
}
return ALL_GOOD;
}
// -----------------------------------------------------------------------
int main(int argc, const char* argv[]) {
// Setup an AtExitManager so Singleton objects will be destroyed.
base::AtExitManager at_exit_manager;
CommandLine::Init(argc, argv);
const CommandLine& command_line = *CommandLine::ForCurrentProcess();
std::wstring input_path = command_line.GetSwitchValue(kInputPath);
if (input_path.empty())
return Help();
bool upgrade = false;
bool slave_required = false;
std::wstring output_path;
if (command_line.HasSwitch(kUpgrade)) {
output_path = command_line.GetSwitchValue(kOutputPath);
if (output_path.empty())
return Help();
slave_required = true;
upgrade = true;
}
int version = GetMajorVersion(input_path);
if (!version)
return FILE_ACCESS_ERROR;
if (version != disk_cache::kCurrentVersion >> 16) {
if (command_line.HasSwitch(kSlave)) {
printf("Unknown version\n");
return UNKNOWN_VERSION;
}
slave_required = true;
}
std::wstring pipe_number = command_line.GetSwitchValue(kPipe);
if (command_line.HasSwitch(kSlave) && slave_required)
return RunSlave(input_path, pipe_number);
ScopedHandle server;
if (slave_required) {
server.Set(CreateServer(&pipe_number));
if (!server.IsValid()) {
printf("Unable to create the server pipe\n");
return -1;
}
int ret = LaunchSlave(command_line, pipe_number, version);
if (ret)
return ret;
}
if (upgrade)
return Upgrade(output_path, server);
if (slave_required) {
// Wait until the slave starts dumping data before we quit. Lazy "fix" for a
// console quirk.
Sleep(500);
return ALL_GOOD;
}
if (command_line.HasSwitch(kDumpContents))
return DumpContents(input_path);
if (command_line.HasSwitch(kDumpHeaders))
return DumpHeaders(input_path);
return Help();
}
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