108 lines
3.0 KiB
C++
108 lines
3.0 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SIMPLE_PERF_BUILD_ID_H_
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#define SIMPLE_PERF_BUILD_ID_H_
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#include <android-base/stringprintf.h>
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#include <string.h>
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#include <algorithm>
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#include <string>
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#include <string_view>
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namespace simpleperf {
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constexpr size_t BUILD_ID_SIZE = 20;
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// Shared libraries can have a section called .note.gnu.build-id, containing
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// a ~20 bytes unique id. Build id is used to compare if two shared libraries
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// are actually the same. BuildId class is the representation of build id in
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// memory.
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class BuildId {
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public:
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static size_t Size() { return BUILD_ID_SIZE; }
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BuildId() { memset(data_, '\0', BUILD_ID_SIZE); }
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// Copy build id from a byte array, like {0x76, 0x00, 0x32,...}.
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BuildId(const void* data, size_t len) : BuildId() {
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memcpy(data_, data, std::min(len, BUILD_ID_SIZE));
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}
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// Read build id from a hex string, like "7600329e31058e12b145d153ef27cd40e1a5f7b9".
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explicit BuildId(const std::string& s) : BuildId() {
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for (size_t i = 0; i < s.size() && i < BUILD_ID_SIZE * 2; i += 2) {
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unsigned char ch = 0;
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for (size_t j = i; j < i + 2; ++j) {
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ch <<= 4;
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if (s[j] >= '0' && s[j] <= '9') {
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ch |= s[j] - '0';
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} else if (s[j] >= 'a' && s[j] <= 'f') {
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ch |= s[j] - 'a' + 10;
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} else if (s[j] >= 'A' && s[j] <= 'F') {
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ch |= s[j] - 'A' + 10;
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}
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}
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data_[i / 2] = ch;
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}
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}
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const unsigned char* Data() const { return data_; }
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std::string ToString() const {
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std::string s = "0x";
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for (size_t i = 0; i < BUILD_ID_SIZE; ++i) {
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s += android::base::StringPrintf("%02x", data_[i]);
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}
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return s;
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}
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bool operator==(const BuildId& build_id) const {
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return memcmp(data_, build_id.data_, BUILD_ID_SIZE) == 0;
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}
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bool operator!=(const BuildId& build_id) const { return !(*this == build_id); }
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bool IsEmpty() const {
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static BuildId empty_build_id;
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return *this == empty_build_id;
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}
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private:
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unsigned char data_[BUILD_ID_SIZE];
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};
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inline std::ostream& operator<<(std::ostream& os, const BuildId& build_id) {
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os << build_id.ToString();
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return os;
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}
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} // namespace simpleperf
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namespace std {
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template <>
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struct hash<simpleperf::BuildId> {
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size_t operator()(const simpleperf::BuildId& build_id) const noexcept {
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return std::hash<std::string_view>()(
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std::string_view(reinterpret_cast<const char*>(build_id.Data()), build_id.Size()));
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}
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};
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} // namespace std
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#endif // SIMPLE_PERF_BUILD_ID_H_
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