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// Copyright 2014 The Chromium OS 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 "chromeos-dbus-bindings/dbus_signature.h"
#include <base/logging.h>
#include <base/strings/stringprintf.h>
#include <chromeos/strings/string_utils.h>
#include <dbus/dbus-protocol.h>
using base::StringPrintf;
using std::string;
using std::vector;
namespace chromeos_dbus_bindings {
// static
const char DbusSignature::kArrayTypename[] = "std::vector";
const char DbusSignature::kBooleanTypename[] = "bool";
const char DbusSignature::kByteTypename[] = "uint8_t";
const char DbusSignature::kDefaultObjectPathTypename[] = "dbus::ObjectPath";
const char DbusSignature::kDictTypename[] = "std::map";
const char DbusSignature::kDoubleTypename[] = "double";
const char DbusSignature::kSigned16Typename[] = "int16_t";
const char DbusSignature::kSigned32Typename[] = "int32_t";
const char DbusSignature::kSigned64Typename[] = "int64_t";
const char DbusSignature::kStringTypename[] = "std::string";
const char DbusSignature::kUnixFdTypename[] = "dbus::FileDescriptor";
const char DbusSignature::kUnsigned16Typename[] = "uint16_t";
const char DbusSignature::kUnsigned32Typename[] = "uint32_t";
const char DbusSignature::kUnsigned64Typename[] = "uint64_t";
const char DbusSignature::kVariantTypename[] = "chromeos::Any";
const char DbusSignature::kVariantDictTypename[] =
"chromeos::VariantDictionary";
const char DbusSignature::kTupleTypename[] = "std::tuple";
DbusSignature::DbusSignature()
: object_path_typename_(kDefaultObjectPathTypename) {}
bool DbusSignature::Parse(const string& signature, string* output) {
string::const_iterator end;
if (!GetTypenameForSignature(
signature.begin(), signature.end(), &end, output)) {
LOG(ERROR) << "Parse failed for signature " << signature;
return false;
}
if (end != signature.end()) {
LOG(WARNING) << "A portion of signature " << signature
<< " is left unparsed: " << string(end, signature.end());
}
return true;
}
bool DbusSignature::GetTypenameForSignature(
string::const_iterator signature,
string::const_iterator end,
string::const_iterator* next,
string* output) {
if (signature == end) {
LOG(ERROR) << "Signature is empty";
return false;
}
string::const_iterator cur = signature;
int signature_value = *cur++;
switch (signature_value) {
case DBUS_STRUCT_BEGIN_CHAR:
if (!GetStructTypenameForSignature(cur, end, &cur, output)) {
return false;
}
break;
case DBUS_TYPE_ARRAY:
if (!GetArrayTypenameForSignature(cur, end, &cur, output)) {
return false;
}
break;
case DBUS_TYPE_BOOLEAN:
*output = kBooleanTypename;
break;
case DBUS_TYPE_BYTE:
*output = kByteTypename;
break;
case DBUS_TYPE_DOUBLE:
*output = kDoubleTypename;
break;
case DBUS_TYPE_OBJECT_PATH:
*output = object_path_typename_;
break;
case DBUS_TYPE_INT16:
*output = kSigned16Typename;
break;
case DBUS_TYPE_INT32:
*output = kSigned32Typename;
break;
case DBUS_TYPE_INT64:
*output = kSigned64Typename;
break;
case DBUS_TYPE_STRING:
*output = kStringTypename;
break;
case DBUS_TYPE_UNIX_FD:
*output = kUnixFdTypename;
break;
case DBUS_TYPE_UINT16:
*output = kUnsigned16Typename;
break;
case DBUS_TYPE_UINT32:
*output = kUnsigned32Typename;
break;
case DBUS_TYPE_UINT64:
*output = kUnsigned64Typename;
break;
case DBUS_TYPE_VARIANT:
*output = kVariantTypename;
break;
default:
LOG(ERROR) << "Unexpected token " << *signature;
return false;
}
if (next) {
*next = cur;
}
return true;
}
bool DbusSignature::GetArrayTypenameForSignature(
string::const_iterator signature,
string::const_iterator end,
string::const_iterator* next,
string* output) {
string::const_iterator cur = signature;
if (cur == end) {
LOG(ERROR) << "At end of string while reading array parameter";
return false;
}
if (*cur == DBUS_DICT_ENTRY_BEGIN_CHAR) {
vector<string> children;
++cur;
while (cur != end && *cur != DBUS_DICT_ENTRY_END_CHAR) {
children.emplace_back();
if (!GetTypenameForSignature(cur, end, &cur, &children.back())) {
LOG(ERROR) << "Unable to decode child elements starting at "
<< string(cur, end);
return false;
}
}
if (cur == end) {
LOG(ERROR) << "At end of string while processing dict "
<< "starting at " << string(signature, end);
return false;
}
DCHECK_EQ(DBUS_DICT_ENTRY_END_CHAR, *cur);
++cur;
if (children.size() != 2) {
LOG(ERROR) << "Dict entry contains " << children.size()
<< " members starting at " << string(signature, end)
<< " where only 2 children is valid.";
return false;
}
string dict_signature{signature, cur};
if (dict_signature == "{sv}") {
*output = kVariantDictTypename;
} else {
*output = StringPrintf("%s<%s, %s>", kDictTypename,
children[0].c_str(), children[1].c_str());
}
} else {
string child;
if (!GetTypenameForSignature(cur, end, &cur, &child)) {
LOG(ERROR) << "Unable to decode child element starting at "
<< string(cur, end);
return false;
}
*output = StringPrintf("%s<%s>", kArrayTypename, child.c_str());
}
if (next) {
*next = cur;
}
return true;
}
bool DbusSignature::GetStructTypenameForSignature(
string::const_iterator signature,
string::const_iterator end,
string::const_iterator* next,
string* output) {
string::const_iterator cur = signature;
if (cur == end) {
LOG(ERROR) << "At end of string while reading struct parameter";
return false;
}
vector<string> children;
while (cur != end && *cur != DBUS_STRUCT_END_CHAR) {
children.emplace_back();
if (!GetTypenameForSignature(cur, end, &cur, &children.back())) {
LOG(ERROR) << "Unable to decode child elements starting at "
<< string(cur, end);
return false;
}
}
if (cur == end) {
LOG(ERROR) << "At end of string while processing struct "
<< "starting at " << string(signature, end);
return false;
}
DCHECK_EQ(DBUS_STRUCT_END_CHAR, *cur);
++cur;
*output = StringPrintf(
"%s<%s>", kTupleTypename,
chromeos::string_utils::Join(", ", children).c_str());
if (next) {
*next = cur;
}
return true;
}
} // namespace chromeos_dbus_bindings
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