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