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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromecast/base/hash_util.h"
#include <limits.h>
#include <vector>
#include "base/check_op.h"
#include "base/hash/sha1.h"
#include "base/logging.h"
#include "base/notreached.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "chromecast/base/legacy_app_id_mapper.h"
#include "chromecast/base/version.h"
namespace chromecast {
namespace {
const size_t kAppIdV2StrLen = 8;
} // namespace
uint64_t HashToUInt64(const std::string& value) {
uint64_t output;
const std::string sha1hash = base::SHA1HashString(value);
DCHECK_GE(sha1hash.size(), sizeof(output));
memcpy(&output, sha1hash.data(), sizeof(output));
return output;
}
uint32_t HashToUInt32(const std::string& value) {
uint32_t output;
const std::string sha1hash = base::SHA1HashString(value);
DCHECK_GE(sha1hash.size(), sizeof(output));
memcpy(&output, sha1hash.data(), sizeof(output));
return output;
}
uint64_t HashGUID64(const std::string& guid) {
std::string hex;
base::RemoveChars(guid, "-", &hex);
uint64_t output;
DCHECK_EQ(hex.size(), 32u);
if (base::HexStringToUInt64(hex.substr(0, 16), &output))
return output;
NOTREACHED();
return 0;
}
uint32_t HashAppId32(const std::string& app_id) {
uint32_t output;
if (app_id.size() == kAppIdV2StrLen &&
base::HexStringToUInt(app_id, &output)) {
return output;
}
return MapLegacyAppId(app_id);
}
uint64_t HashCastBuildNumber64(const std::string& build_number) {
uint64_t return_value = 0;
std::vector<std::string> tokens(base::SplitString(
build_number, ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL));
const size_t tsize = tokens.size();
if (tsize < 1 || tsize > 4)
return static_cast<uint64_t>(-1);
int bits = 64 / tsize;
// special case for 3-tuple to make hex look nicer.
if (tsize == 3)
bits = 16;
for (size_t i = 0; i < tsize; ++i) {
// special case for the last token of 3-tuple.
if (tsize == 3 && i == 2)
bits = 32;
return_value <<= bits;
unsigned value = 0;
if (!base::StringToUint(tokens[i], &value))
return static_cast<uint64_t>(-1);
if (bits != 64) // avoid overflow
value &= (static_cast<uint64_t>(1) << bits) - 1;
return_value |= value;
}
return return_value;
}
uint64_t HashSessionId64(const std::string& session_id) {
return HashGUID64(session_id);
}
uint64_t HashSdkVersion64(const std::string& sdk_version) {
if (sdk_version.empty())
return 0;
// Sdk version is usually in "X.Y.Z(.minor)" format.
// Following code is a little bit relaxed to accept all sub-fields optional.
uint64_t return_value = 0;
std::vector<std::string> tokens(base::SplitString(
sdk_version, ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL));
for (size_t i = 0; i < 4; ++i) {
return_value <<= 16;
if (tokens.size() > i) {
unsigned value = 0;
if (base::StringToUint(tokens[i], &value)) {
return_value |= value & 0xFFFF;
} else {
LOG_IF(ERROR, !CAST_IS_DEBUG_BUILD())
<< "Sdk version " << sdk_version << " is not in correct format.";
return static_cast<uint64_t>(-1);
}
}
}
return return_value;
}
uint32_t HashSocketId32(const std::string& socket_id) {
uint32_t output;
// socket id is usually just numerical.
if (base::StringToUint(socket_id, &output)) {
return output;
} else { // CastControlSocket and unittests.
return HashToUInt32(socket_id);
}
}
uint32_t HashConnectionId32(const std::string& connection_id) {
return HashToUInt32(connection_id);
}
uint64_t HashAndroidBuildNumber64(const std::string& build_id) {
if (build_id.length() == 0) {
return static_cast<uint64_t>(-1);
}
uint64_t value = 0;
for (const char& c : build_id.substr(0, sizeof(value) / sizeof(char))) {
value <<= CHAR_BIT;
value += c;
}
return value;
}
} // namespace chromecast
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