int SPTPersistentCacheValidateHeader()

in Sources/SPTPersistentCacheHeader.m [72:100]

• 20 lines of code
• 6 McCabe index (conditional complexity)

int /*SPTPersistentCacheLoadingError*/ SPTPersistentCacheValidateHeader(const SPTPersistentCacheRecordHeader *header)
{
    if (header == NULL) {
        return SPTPersistentCacheLoadingErrorInternalInconsistency;
    }

    // Check that header could be read according to alignment
    if (!SPTPersistentCachePointerMagicAlignCheck(header)) {
        return SPTPersistentCacheLoadingErrorHeaderAlignmentMismatch;
    }

    // 1. Check magic
    if (header->magic != SPTPersistentCacheMagicValue) {
        return SPTPersistentCacheLoadingErrorMagicMismatch;
    }

    // 2. Check CRC
    uint32_t crc = SPTPersistentCacheCalculateHeaderCRC(header);
    if (crc != header->crc) {
        return SPTPersistentCacheLoadingErrorInvalidHeaderCRC;
    }

    // 3. Check header size
    if (header->headerSize != SPTPersistentCacheRecordHeaderSize) {
        return SPTPersistentCacheLoadingErrorWrongHeaderSize;
    }

    return -1;
}