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/**
* libdmtx - Data Matrix Encoding/Decoding Library
* Copyright 2011 Mike Laughton. All rights reserved.
* Copyright 2012-2016 Vadim A. Misbakh-Soloviov. All rights reserved.
*
* See LICENSE file in the main project directory for full
* terms of use and distribution.
*
* Contact:
* Vadim A. Misbakh-Soloviov <dmtx@mva.name>
* Mike Laughton <mike@dragonflylogic.com>
*
* \file dmtxencodestream.c
* \brief DmtxEncodeStream implementation
*/
/**
*
*
*/
static DmtxEncodeStream
StreamInit(DmtxByteList *input, DmtxByteList *output)
{
DmtxEncodeStream stream;
stream.input = input;
stream.output = output;
stream.currentScheme = DmtxSchemeAscii;
stream.inputNext = 0;
stream.outputChainValueCount = 0;
stream.outputChainWordCount = 0;
stream.reason = NULL;
stream.sizeIdx = DmtxUndefined;
stream.status = DmtxStatusEncoding;
return stream;
}
/**
*
*
*/
static void
StreamCopy(DmtxEncodeStream *dst, DmtxEncodeStream *src)
{
DmtxPassFail passFail;
dst->currentScheme = src->currentScheme;
dst->inputNext = src->inputNext;
dst->outputChainValueCount = src->outputChainValueCount;
dst->outputChainWordCount = src->outputChainWordCount;
dst->reason = src->reason;
dst->sizeIdx = src->sizeIdx;
dst->status = src->status;
dst->input = src->input;
dst->fnc1 = src->fnc1;
dmtxByteListCopy(dst->output, src->output, &passFail);
}
/**
*
*
*/
static void
StreamMarkComplete(DmtxEncodeStream *stream, int sizeIdx)
{
if(stream->status == DmtxStatusEncoding)
{
stream->sizeIdx = sizeIdx;
stream->status = DmtxStatusComplete;
assert(stream->reason == NULL);
}
}
/**
*
*
*/
static void
StreamMarkInvalid(DmtxEncodeStream *stream, int reasonIdx)
{
stream->status = DmtxStatusInvalid;
stream->reason = dmtxErrorMessage[reasonIdx];
}
/**
*
*
*/
static void
StreamMarkFatal(DmtxEncodeStream *stream, int reasonIdx)
{
stream->status = DmtxStatusFatal;
stream->reason = dmtxErrorMessage[reasonIdx];
}
/**
* push on newest/last append
* used for encoding each output cw
*/
static void
StreamOutputChainAppend(DmtxEncodeStream *stream, DmtxByte value)
{
DmtxPassFail passFail;
dmtxByteListPush(stream->output, value, &passFail);
if(passFail == DmtxPass)
stream->outputChainWordCount++;
else
StreamMarkFatal(stream, DmtxErrorOutOfBounds);
}
/**
* pop off newest/last
* used for edifact
*/
static DmtxByte
StreamOutputChainRemoveLast(DmtxEncodeStream *stream)
{
DmtxByte value;
DmtxPassFail passFail;
if(stream->outputChainWordCount > 0)
{
value = dmtxByteListPop(stream->output, &passFail);
stream->outputChainWordCount--;
}
else
{
value = 0;
StreamMarkFatal(stream, DmtxErrorEmptyList);
}
return value;
}
/**
* overwrite arbitrary element
* used for binary length changes
*/
static void
StreamOutputSet(DmtxEncodeStream *stream, int index, DmtxByte value)
{
if(index < 0 || index >= stream->output->length)
StreamMarkFatal(stream, DmtxErrorOutOfBounds);
else
stream->output->b[index] = value;
}
/**
*
*
*/
static DmtxBoolean
StreamInputHasNext(DmtxEncodeStream *stream)
{
return (stream->inputNext < stream->input->length) ? DmtxTrue : DmtxFalse;
}
/**
* peek at first/oldest
* used for ascii double digit
*/
static DmtxByte
StreamInputPeekNext(DmtxEncodeStream *stream)
{
DmtxByte value = 0;
if(StreamInputHasNext(stream))
value = stream->input->b[stream->inputNext];
else
StreamMarkFatal(stream, DmtxErrorOutOfBounds);
return value;
}
/**
* used as each input cw is processed
*
* \param value Value to populate, can be null (for blind dequeues)
* \param stream
*/
static DmtxByte
StreamInputAdvanceNext(DmtxEncodeStream *stream)
{
DmtxByte value;
value = StreamInputPeekNext(stream);
if(stream->status == DmtxStatusEncoding)
stream->inputNext++; /* XXX is this what we really mean here? */
return value;
}
/**
* used as each input cw is processed
*
* \param value Value to populate, can be null (for blind dequeues)
* \param stream
*/
static void
StreamInputAdvancePrev(DmtxEncodeStream *stream)
{
if(stream->inputNext > 0)
stream->inputNext--;
else
StreamMarkFatal(stream, DmtxErrorOutOfBounds);
}
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