将“十六进制数组”字符串复制到缓冲区的最有效方法？

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void copyHexArrayToBuffer(const char* hexArrayStr, unsigned char* buffer, size_t bufferSize) {
    size_t hexArrayLen = strlen(hexArrayStr);
    size_t bufferLen = hexArrayLen / 2;

    if (bufferSize < bufferLen) {
        printf("Error: Buffer size is too small.\n");
        return;
    }

    for (size_t i = 0; i < bufferLen; i++) {
        sscanf(hexArrayStr + (2 * i), "%2hhx", &buffer[i]);
    }
}

int main() {
    const char* hexArrayStr = "48656c6c6f20576f726c64";
    size_t bufferSize = strlen(hexArrayStr) / 2;
    unsigned char* buffer = (unsigned char*)malloc(bufferSize);

    copyHexArrayToBuffer(hexArrayStr, buffer, bufferSize);

    printf("Buffer contents: ");
    for (size_t i = 0; i < bufferSize; i++) {
        printf("%02x ", buffer[i]);
    }
    printf("\n");

    free(buffer);

    return 0;
}