int32_t CBC_HighLevelEncoder::lookAheadTest(CFX_WideString msg,
int32_t startpos,
int32_t currentMode) {
if (startpos >= msg.GetLength()) {
return currentMode;
}
CFX_FloatArray charCounts;
if (currentMode == ASCII_ENCODATION) {
charCounts.Add(0);
charCounts.Add(1);
charCounts.Add(1);
charCounts.Add(1);
charCounts.Add(1);
charCounts.Add(1.25f);
} else {
charCounts.Add(1);
charCounts.Add(2);
charCounts.Add(2);
charCounts.Add(2);
charCounts.Add(2);
charCounts.Add(2.25f);
charCounts[currentMode] = 0;
}
int32_t charsProcessed = 0;
while (TRUE) {
if ((startpos + charsProcessed) == msg.GetLength()) {
FX_DWORD min = std::numeric_limits<int32_t>::max();
CFX_ByteArray mins;
mins.SetSize(6);
CFX_Int32Array intCharCounts;
intCharCounts.SetSize(6);
min = findMinimums(charCounts, intCharCounts, min, mins);
int32_t minCount = getMinimumCount(mins);
if (intCharCounts[ASCII_ENCODATION] == min) {
return ASCII_ENCODATION;
}
if (minCount == 1 && mins[BASE256_ENCODATION] > 0) {
return BASE256_ENCODATION;
}
if (minCount == 1 && mins[EDIFACT_ENCODATION] > 0) {
return EDIFACT_ENCODATION;
}
if (minCount == 1 && mins[TEXT_ENCODATION] > 0) {
return TEXT_ENCODATION;
}
if (minCount == 1 && mins[X12_ENCODATION] > 0) {
return X12_ENCODATION;
}
return C40_ENCODATION;
}
FX_WCHAR c = msg.GetAt(startpos + charsProcessed);
charsProcessed++;
if (isDigit(c)) {
charCounts[ASCII_ENCODATION] += 0.5;
} else if (isExtendedASCII(c)) {
charCounts[ASCII_ENCODATION] =
(FX_FLOAT)ceil(charCounts[ASCII_ENCODATION]);
charCounts[ASCII_ENCODATION] += 2;
} else {
charCounts[ASCII_ENCODATION] =
(FX_FLOAT)ceil(charCounts[ASCII_ENCODATION]);
charCounts[ASCII_ENCODATION]++;
}
if (isNativeC40(c)) {
charCounts[C40_ENCODATION] += 2.0f / 3.0f;
} else if (isExtendedASCII(c)) {
charCounts[C40_ENCODATION] += 8.0f / 3.0f;
} else {
charCounts[C40_ENCODATION] += 4.0f / 3.0f;
}
if (isNativeText(c)) {
charCounts[TEXT_ENCODATION] += 2.0f / 3.0f;
} else if (isExtendedASCII(c)) {
charCounts[TEXT_ENCODATION] += 8.0f / 3.0f;
} else {
charCounts[TEXT_ENCODATION] += 4.0f / 3.0f;
}
if (isNativeX12(c)) {
charCounts[X12_ENCODATION] += 2.0f / 3.0f;
} else if (isExtendedASCII(c)) {
charCounts[X12_ENCODATION] += 13.0f / 3.0f;
} else {
charCounts[X12_ENCODATION] += 10.0f / 3.0f;
}
if (isNativeEDIFACT(c)) {
charCounts[EDIFACT_ENCODATION] += 3.0f / 4.0f;
} else if (isExtendedASCII(c)) {
charCounts[EDIFACT_ENCODATION] += 17.0f / 4.0f;
} else {
charCounts[EDIFACT_ENCODATION] += 13.0f / 4.0f;
}
if (isSpecialB256(c)) {
charCounts[BASE256_ENCODATION] += 4;
} else {
charCounts[BASE256_ENCODATION]++;
}
if (charsProcessed >= 4) {
CFX_Int32Array intCharCounts;
intCharCounts.SetSize(6);
CFX_ByteArray mins;
mins.SetSize(6);
findMinimums(charCounts, intCharCounts,
std::numeric_limits<int32_t>::max(), mins);
int32_t minCount = getMinimumCount(mins);
if (intCharCounts[ASCII_ENCODATION] < intCharCounts[BASE256_ENCODATION] &&
intCharCounts[ASCII_ENCODATION] < intCharCounts[C40_ENCODATION] &&
intCharCounts[ASCII_ENCODATION] < intCharCounts[TEXT_ENCODATION] &&
intCharCounts[ASCII_ENCODATION] < intCharCounts[X12_ENCODATION] &&
intCharCounts[ASCII_ENCODATION] < intCharCounts[EDIFACT_ENCODATION]) {
return ASCII_ENCODATION;
}
if (intCharCounts[BASE256_ENCODATION] < intCharCounts[ASCII_ENCODATION] ||
(mins[C40_ENCODATION] + mins[TEXT_ENCODATION] + mins[X12_ENCODATION] +
mins[EDIFACT_ENCODATION]) == 0) {
return BASE256_ENCODATION;
}
if (minCount == 1 && mins[EDIFACT_ENCODATION] > 0) {
return EDIFACT_ENCODATION;
}
if (minCount == 1 && mins[TEXT_ENCODATION] > 0) {
return TEXT_ENCODATION;
}
if (minCount == 1 && mins[X12_ENCODATION] > 0) {
return X12_ENCODATION;
}
if (intCharCounts[C40_ENCODATION] + 1 < intCharCounts[ASCII_ENCODATION] &&
intCharCounts[C40_ENCODATION] + 1 <
intCharCounts[BASE256_ENCODATION] &&
intCharCounts[C40_ENCODATION] + 1 <
intCharCounts[EDIFACT_ENCODATION] &&
intCharCounts[C40_ENCODATION] + 1 < intCharCounts[TEXT_ENCODATION]) {
if (intCharCounts[C40_ENCODATION] < intCharCounts[X12_ENCODATION]) {
return C40_ENCODATION;
}
if (intCharCounts[C40_ENCODATION] == intCharCounts[X12_ENCODATION]) {
int32_t p = startpos + charsProcessed + 1;
while (p < msg.GetLength()) {
FX_WCHAR tc = msg.GetAt(p);
if (isX12TermSep(tc)) {
return X12_ENCODATION;
}
if (!isNativeX12(tc)) {
break;
}
p++;
}
return C40_ENCODATION;
}
}
}
}
}
