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69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#ifndef ARROW_UTIL_STRING_UTIL_H
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#define ARROW_UTIL_STRING_UTIL_H
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#include <algorithm>
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#include <string>
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#include "arrow/status.h"
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#include "arrow/util/string_view.h"
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namespace arrow {
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static const char* kAsciiTable = "0123456789ABCDEF";
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static inline std::string HexEncode(const uint8_t* data, size_t length) {
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std::string hex_string;
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hex_string.reserve(length * 2);
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for (size_t j = 0; j < length; ++j) {
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// Convert to 2 base16 digits
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hex_string.push_back(kAsciiTable[data[j] >> 4]);
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hex_string.push_back(kAsciiTable[data[j] & 15]);
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}
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return hex_string;
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}
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static inline std::string HexEncode(const char* data, size_t length) {
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return HexEncode(reinterpret_cast<const uint8_t*>(data), length);
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}
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static inline std::string HexEncode(util::string_view str) {
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return HexEncode(str.data(), str.size());
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}
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static inline Status ParseHexValue(const char* data, uint8_t* out) {
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char c1 = data[0];
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char c2 = data[1];
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const char* pos1 = std::lower_bound(kAsciiTable, kAsciiTable + 16, c1);
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const char* pos2 = std::lower_bound(kAsciiTable, kAsciiTable + 16, c2);
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// Error checking
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if (*pos1 != c1 || *pos2 != c2) {
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return Status::Invalid("Encountered non-hex digit");
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}
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*out = static_cast<uint8_t>((pos1 - kAsciiTable) << 4 | (pos2 - kAsciiTable));
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return Status::OK();
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}
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} // namespace arrow
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#endif // ARROW_UTIL_STRING_UTIL_H
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