OID计算方法

最新推荐文章于 2025-05-21 12:04:25 发布

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最新推荐文章于 2025-05-21 12:04:25 发布

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本文链接：https://blog.youkuaiyun.com/m0_47673868/article/details/137261372

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int BerEncoder_encodeOIDToBuffer(const char* oidString, uint8_t* buffer, int maxBufLen)
{
    int encodedBytes = 0;
    int x = atoi(oidString);
    char sepChar = '.';
    const char* separator = strchr(oidString, '.');
    if (separator == NULL) {
        sepChar = ',';
        separator = strchr(oidString, ',');
    }
    if (separator == NULL) {
        sepChar = ' ';
        separator = strchr(oidString, ' ');
    }
    if (separator == NULL) return 0;
    int y = atoi(separator + 1);
    int val = x * 40 + y;
    if (encodedBytes < maxBufLen)
        buffer[encodedBytes] = (uint8_t) val;
    else
        return 0;
    encodedBytes++;
    while (1) {
        separator = strchr(separator + 1, sepChar);
        if (separator == NULL)
            break;
        val = atoi(separator + 1);
        if (val == 0) {
            buffer[encodedBytes++] = 0;
        }
        else {
            int requiredBytes = 0;
            int val2 = val;
            while (val2 > 0) {
                requiredBytes++;
                val2 = val2 >> 7;
            }
            while (requiredBytes > 0) {
                val2 = val >> (7 * (requiredBytes - 1));
                val2 = val2 & 0x7f;
                if (requiredBytes > 1)
                    val2 += 128;
                if (encodedBytes == maxBufLen)
                    return 0;
                buffer[encodedBytes++] = (uint8_t) val2;
                requiredBytes--;
            }
        }
    }
    return encodedBytes;
}