static int GetCertHeader(DecodedCert* cert)
{
    int ret = 0, len;

    if (GetSequence(cert->source, &cert->srcIdx, &len, cert->maxIdx) < 0)
        return ASN_PARSE_E;

    /* Reset the max index for the size indicated in the outer wrapper. */
    cert->maxIdx = len + cert->srcIdx;
    cert->certBegin = cert->srcIdx;

    if (GetSequence(cert->source, &cert->srcIdx, &len, cert->maxIdx) < 0)
        return ASN_PARSE_E;

    cert->sigIndex = len + cert->srcIdx;
    if (cert->sigIndex > cert->maxIdx)
        return ASN_PARSE_E;

    if (GetExplicitVersion(cert->source, &cert->srcIdx, &cert->version,
                                                            cert->sigIndex) < 0)
        return ASN_PARSE_E;

    if (GetSerialNumber(cert->source, &cert->srcIdx, cert->serial,
                                           &cert->serialSz, cert->sigIndex) < 0)
        return ASN_PARSE_E;

    return ret;
}
static int GetCertHeader(DecodedCert* cert)
{
    int ret = 0, len;

    if (GetSequence(cert->source, &cert->srcIdx, &len, cert->maxIdx) < 0)
        return ASN_PARSE_E;

     
    cert->maxIdx = len + cert->srcIdx;
    cert->certBegin = cert->srcIdx;

    if (GetSequence(cert->source, &cert->srcIdx, &len, cert->maxIdx) < 0)
        return ASN_PARSE_E;

    cert->sigIndex = len + cert->srcIdx;
    if (cert->sigIndex > cert->maxIdx)
        return ASN_PARSE_E;

    if (GetExplicitVersion(cert->source, &cert->srcIdx, &cert->version,
                                                            cert->sigIndex) < 0)
        return ASN_PARSE_E;

    if (GetSerialNumber(cert->source, &cert->srcIdx, cert->serial,
                                           &cert->serialSz, cert->sigIndex) < 0)
        return ASN_PARSE_E;

    return ret;
}