BUFFER_HANDLE Azure_Base64_Decode()

in src/azure_base64.c [189:235]

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

BUFFER_HANDLE Azure_Base64_Decode(const char* source)
{
    BUFFER_HANDLE result;
    /*Codes_SRS_BASE64_06_008: [If source is NULL then Azure_Base64_Decode shall return NULL.]*/
    if (source == NULL)
    {
        LogError("invalid parameter const char* source=%p", source);
        result = NULL;
    }
    else
    {
        if ((strlen(source) % 4) != 0)
        {
            /*Codes_SRS_BASE64_06_011: [If the source string has an invalid length for a base 64 encoded string then Azure_Base64_Decode shall return NULL.]*/
            LogError("Invalid length Base64 string!");
            result = NULL;
        }
        else
        {
            if ((result = BUFFER_new()) == NULL)
            {
                /*Codes_SRS_BASE64_06_010: [If there is any memory allocation failure during the decode then Azure_Base64_Decode shall return NULL.]*/
                LogError("Could not create a buffer to decoding.");
            }
            else
            {
                size_t sizeOfOutputBuffer = Base64decode_len(source);
                /*Codes_SRS_BASE64_06_009: [If the string pointed to by source is zero length then the handle returned shall refer to a zero length buffer.]*/
                if (sizeOfOutputBuffer > 0)
                {
                    if (BUFFER_pre_build(result, sizeOfOutputBuffer) != 0)
                    {
                        /*Codes_SRS_BASE64_06_010: [If there is any memory allocation failure during the decode then Azure_Base64_Decode shall return NULL.]*/
                        LogError("Could not prebuild a buffer for base 64 decoding.");
                        BUFFER_delete(result);
                        result = NULL;
                    }
                    else
                    {
                        Base64decode(BUFFER_u_char(result), source);
                    }
                }
            }
        }
    }
    return result;
}