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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include <algorithm>
#include <cstdint>
#include <cstring>
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace trace
{
namespace propagation
{
// NOTE - code within `detail` namespace implements internal details, and not part
// of the public interface.
namespace detail
{
constexpr int8_t kHexDigits[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
inline int8_t HexToInt(char c)
{
return kHexDigits[uint8_t(c)];
}
inline bool IsValidHex(nostd::string_view s)
{
return std::all_of(s.begin(), s.end(), [](char c) { return HexToInt(c) != -1; });
}
/**
* Converts a hexadecimal to binary format if the hex string will fit the buffer.
* Smaller hex strings are left padded with zeroes.
*/
inline bool HexToBinary(nostd::string_view hex, uint8_t *buffer, size_t buffer_size)
{
std::memset(buffer, 0, buffer_size);
if (hex.size() > buffer_size * 2)
{
return false;
}
int64_t hex_size = int64_t(hex.size());
int64_t buffer_pos = int64_t(buffer_size) - (hex_size + 1) / 2;
int64_t last_hex_pos = hex_size - 1;
bool is_hex_size_odd = (hex_size % 2) == 1;
int64_t i = 0;
if (is_hex_size_odd)
{
buffer[buffer_pos++] = HexToInt(hex[i++]);
}
for (; i < last_hex_pos; i += 2)
{
buffer[buffer_pos++] = (HexToInt(hex[i]) << 4) | HexToInt(hex[i + 1]);
}
return true;
}
} // namespace detail
} // namespace propagation
} // namespace trace
OPENTELEMETRY_END_NAMESPACE
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