void LZ4_attach_dictionary()

in lz4.cpp [1658:1684]

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

void LZ4_attach_dictionary(LZ4_stream_t* workingStream, const LZ4_stream_t* dictionaryStream)
{
    const LZ4_stream_t_internal* dictCtx = (dictionaryStream == NULL) ? NULL :
        &(dictionaryStream->internal_donotuse);

    DEBUGLOG(4, "LZ4_attach_dictionary (%p, %p, size %u)",
             workingStream, dictionaryStream,
             dictCtx != NULL ? dictCtx->dictSize : 0);

    if (dictCtx != NULL) {
        /* If the current offset is zero, we will never look in the
         * external dictionary context, since there is no value a table
         * entry can take that indicate a miss. In that case, we need
         * to bump the offset to something non-zero.
         */
        if (workingStream->internal_donotuse.currentOffset == 0) {
            workingStream->internal_donotuse.currentOffset = 64 KB;
        }

        /* Don't actually attach an empty dictionary.
         */
        if (dictCtx->dictSize == 0) {
            dictCtx = NULL;
        }
    }
    workingStream->internal_donotuse.dictCtx = dictCtx;
}