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/*
*
* Copyright 2015 gRPC authors.
*
* 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.
*
*/
#include "test/core/util/parse_hexstring.h"
#include <stddef.h>
#include <stdint.h>
#include <grpc/support/log.h>
grpc_slice parse_hexstring(const char* hexstring) {
size_t nibbles = 0;
const char* p = nullptr;
uint8_t* out;
uint8_t temp;
grpc_slice slice;
for (p = hexstring; *p; p++) {
nibbles += (*p >= '0' && *p <= '9') || (*p >= 'a' && *p <= 'f');
}
GPR_ASSERT((nibbles & 1) == 0);
slice = grpc_slice_malloc(nibbles / 2);
out = GRPC_SLICE_START_PTR(slice);
nibbles = 0;
temp = 0;
for (p = hexstring; *p; p++) {
if (*p >= '0' && *p <= '9') {
temp = static_cast<uint8_t>(temp << 4) | static_cast<uint8_t>(*p - '0');
nibbles++;
} else if (*p >= 'a' && *p <= 'f') {
temp =
static_cast<uint8_t>(temp << 4) | static_cast<uint8_t>(*p - 'a' + 10);
nibbles++;
}
if (nibbles == 2) {
*out++ = temp;
nibbles = 0;
}
}
return slice;
}
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