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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "barcode.h"
#include "include/BC_Encoder.h"
#include "include/BC_CommonBitMatrix.h"
#include "include/BC_Dimension.h"
#include "include/BC_SymbolShapeHint.h"
#include "include/BC_SymbolInfo.h"
#include "include/BC_EncoderContext.h"
#include "include/BC_HighLevelEncoder.h"
#include "include/BC_EdifactEncoder.h"
CBC_EdifactEncoder::CBC_EdifactEncoder()
{
}
CBC_EdifactEncoder::~CBC_EdifactEncoder()
{
}
FX_INT32 CBC_EdifactEncoder::getEncodingMode()
{
return EDIFACT_ENCODATION;
}
void CBC_EdifactEncoder::Encode(CBC_EncoderContext &context, FX_INT32 &e)
{
CFX_WideString buffer;
while (context.hasMoreCharacters()) {
FX_WCHAR c = context.getCurrentChar();
encodeChar(c, buffer, e);
if (e != BCExceptionNO) {
return;
}
context.m_pos++;
FX_INT32 count = buffer.GetLength();
if (count >= 4) {
context.writeCodewords(encodeToCodewords(buffer, 0, e));
if (e != BCExceptionNO) {
return;
}
buffer.Delete(0, 4);
FX_INT32 newMode = CBC_HighLevelEncoder::lookAheadTest(context.m_msg, context.m_pos, getEncodingMode());
if (newMode != getEncodingMode()) {
context.signalEncoderChange(ASCII_ENCODATION);
break;
}
}
}
buffer += (FX_WCHAR)31;
handleEOD(context, buffer, e);
}
void CBC_EdifactEncoder::handleEOD(CBC_EncoderContext &context, CFX_WideString buffer, FX_INT32 &e)
{
FX_INT32 count = buffer.GetLength();
if (count == 0) {
return;
}
if (count == 1) {
context.updateSymbolInfo(e);
if (e != BCExceptionNO) {
return;
}
FX_INT32 available = context.m_symbolInfo->m_dataCapacity - context.getCodewordCount();
FX_INT32 remaining = context.getRemainingCharacters();
if (remaining == 0 && available <= 2) {
return;
}
}
if (count > 4) {
e = BCExceptionIllegalStateCountMustNotExceed4;
return;
}
FX_INT32 restChars = count - 1;
CFX_WideString encoded = encodeToCodewords(buffer, 0, e);
if (e != BCExceptionNO) {
return;
}
FX_BOOL endOfSymbolReached = !context.hasMoreCharacters();
FX_BOOL restInAscii = endOfSymbolReached && restChars <= 2;
if (restChars <= 2) {
context.updateSymbolInfo(context.getCodewordCount() + restChars, e);
if (e != BCExceptionNO) {
return;
}
FX_INT32 available = context.m_symbolInfo->m_dataCapacity - context.getCodewordCount();
if (available >= 3) {
restInAscii = FALSE;
context.updateSymbolInfo(context.getCodewordCount() + encoded.GetLength(), e);
if (e != BCExceptionNO) {
return;
}
}
}
if (restInAscii) {
context.resetSymbolInfo();
context.m_pos -= restChars;
} else {
context.writeCodewords(encoded);
}
context.signalEncoderChange(ASCII_ENCODATION);
}
void CBC_EdifactEncoder::encodeChar(FX_WCHAR c, CFX_WideString &sb, FX_INT32 &e)
{
if (c >= ' ' && c <= '?') {
sb += c;
} else if (c >= '@' && c <= '^') {
sb += (FX_WCHAR)(c - 64);
} else {
CBC_HighLevelEncoder::illegalCharacter(c, e);
}
}
CFX_WideString CBC_EdifactEncoder::encodeToCodewords(CFX_WideString sb, FX_INT32 startPos, FX_INT32 &e)
{
FX_INT32 len = sb.GetLength() - startPos;
if (len == 0) {
e = BCExceptionNoContents;
return (FX_LPWSTR)"";
}
FX_WCHAR c1 = sb.GetAt(startPos);
FX_WCHAR c2 = len >= 2 ? sb.GetAt(startPos + 1) : 0;
FX_WCHAR c3 = len >= 3 ? sb.GetAt(startPos + 2) : 0;
FX_WCHAR c4 = len >= 4 ? sb.GetAt(startPos + 3) : 0;
FX_INT32 v = (c1 << 18) + (c2 << 12) + (c3 << 6) + c4;
FX_WCHAR cw1 = (FX_WCHAR) ((v >> 16) & 255);
FX_WCHAR cw2 = (FX_WCHAR) ((v >> 8) & 255);
FX_WCHAR cw3 = (FX_WCHAR) (v & 255);
CFX_WideString res;
res += cw1;
if (len >= 2) {
res += cw2;
}
if (len >= 3) {
res += cw3;
}
return res;
}
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