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// Copyright 2014 The PDFium Authors
// 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
// Original code is licensed as follows:
/*
* Copyright 2006-2007 Jeremias Maerki.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "fxbarcode/datamatrix/BC_HighLevelEncoder.h"
#include <algorithm>
#include <array>
#include <limits>
#include <memory>
#include <vector>
#include "core/fxcrt/check.h"
#include "core/fxcrt/fx_extension.h"
#include "fxbarcode/common/BC_CommonBitMatrix.h"
#include "fxbarcode/datamatrix/BC_ASCIIEncoder.h"
#include "fxbarcode/datamatrix/BC_Base256Encoder.h"
#include "fxbarcode/datamatrix/BC_C40Encoder.h"
#include "fxbarcode/datamatrix/BC_EdifactEncoder.h"
#include "fxbarcode/datamatrix/BC_Encoder.h"
#include "fxbarcode/datamatrix/BC_EncoderContext.h"
#include "fxbarcode/datamatrix/BC_SymbolInfo.h"
#include "fxbarcode/datamatrix/BC_TextEncoder.h"
#include "fxbarcode/datamatrix/BC_X12Encoder.h"
namespace {
const wchar_t kPad = 129;
const wchar_t kMacro05 = 236;
const wchar_t kMacro06 = 237;
const wchar_t kMacro05Header[] =
L"[)>\036"
L"05";
const wchar_t kMacro06Header[] =
L"[)>\036"
L"06";
const wchar_t kMacroTrailer = 0x0004;
constexpr size_t kEncoderCount =
static_cast<size_t>(CBC_HighLevelEncoder::Encoding::LAST) + 1;
static_assert(kEncoderCount == 6, "Bad encoder count");
wchar_t Randomize253State(wchar_t ch, int32_t codewordPosition) {
int32_t pseudoRandom = ((149 * codewordPosition) % 253) + 1;
int32_t tempVariable = ch + pseudoRandom;
return tempVariable <= 254 ? static_cast<wchar_t>(tempVariable)
: static_cast<wchar_t>(tempVariable - 254);
}
int32_t FindMinimums(const std::array<float, kEncoderCount>& charCounts,
std::array<int32_t, kEncoderCount>* intCharCounts,
std::array<uint8_t, kEncoderCount>* mins) {
int32_t min = std::numeric_limits<int32_t>::max();
for (size_t i = 0; i < kEncoderCount; ++i) {
int32_t current = static_cast<int32_t>(ceil(charCounts[i]));
(*intCharCounts)[i] = current;
if (min > current) {
min = current;
for (auto& m : *mins)
m = 0;
}
if (min == current)
(*mins)[i]++;
}
return min;
}
int32_t GetMinimumCount(const std::array<uint8_t, kEncoderCount>& mins) {
int32_t count = 0;
for (const auto& m : mins)
count += m;
return count;
}
bool IsNativeC40(wchar_t ch) {
return (ch == ' ') || (ch >= '0' && ch <= '9') || FXSYS_IsUpperASCII(ch);
}
bool IsNativeText(wchar_t ch) {
return (ch == ' ') || (ch >= '0' && ch <= '9') || FXSYS_IsLowerASCII(ch);
}
bool IsX12TermSep(wchar_t ch) {
return (ch == '\r') || (ch == '*') || (ch == '>');
}
bool IsNativeX12(wchar_t ch) {
return IsX12TermSep(ch) || (ch == ' ') || (ch >= '0' && ch <= '9') ||
FXSYS_IsUpperASCII(ch);
}
bool IsNativeEDIFACT(wchar_t ch) {
return ch >= ' ' && ch <= '^';
}
size_t EncoderIndex(CBC_HighLevelEncoder::Encoding encoding) {
DCHECK(encoding != CBC_HighLevelEncoder::Encoding::UNKNOWN);
return static_cast<size_t>(encoding);
}
} // namespace
// static
WideString CBC_HighLevelEncoder::EncodeHighLevel(const WideString& msg) {
// Per spec. Alpha numeric input is even shorter.
static constexpr size_t kMaxNumericInputLength = 3116;
// Exit early if the input is too long. It will fail no matter what.
if (msg.GetLength() > kMaxNumericInputLength)
return WideString();
CBC_EncoderContext context(msg);
if (context.HasCharactersOutsideISO88591Encoding())
return WideString();
if (msg.Back() == kMacroTrailer) {
WideString left = msg.First(6);
if (left == kMacro05Header) {
context.writeCodeword(kMacro05);
context.setSkipAtEnd(2);
context.m_pos += 6;
} else if (left == kMacro06Header) {
context.writeCodeword(kMacro06);
context.setSkipAtEnd(2);
context.m_pos += 6;
}
}
std::vector<std::unique_ptr<CBC_Encoder>> encoders;
encoders.push_back(std::make_unique<CBC_ASCIIEncoder>());
encoders.push_back(std::make_unique<CBC_C40Encoder>());
encoders.push_back(std::make_unique<CBC_TextEncoder>());
encoders.push_back(std::make_unique<CBC_X12Encoder>());
encoders.push_back(std::make_unique<CBC_EdifactEncoder>());
encoders.push_back(std::make_unique<CBC_Base256Encoder>());
Encoding encodingMode = Encoding::ASCII;
while (context.hasMoreCharacters()) {
if (!encoders[EncoderIndex(encodingMode)]->Encode(&context))
return WideString();
if (context.m_newEncoding != Encoding::UNKNOWN) {
encodingMode = context.m_newEncoding;
context.ResetEncoderSignal();
}
}
size_t len = context.m_codewords.GetLength();
if (!context.UpdateSymbolInfo())
return WideString();
size_t capacity = context.m_symbolInfo->data_capacity();
if (len < capacity) {
if (encodingMode != Encoding::ASCII && encodingMode != Encoding::BASE256)
context.writeCodeword(0x00fe);
}
WideString codewords = context.m_codewords;
if (codewords.GetLength() < capacity)
codewords += kPad;
while (codewords.GetLength() < capacity)
codewords += Randomize253State(kPad, codewords.GetLength() + 1);
DCHECK(!codewords.IsEmpty());
return codewords;
}
// static
CBC_HighLevelEncoder::Encoding CBC_HighLevelEncoder::LookAheadTest(
const WideString& msg,
size_t startpos,
CBC_HighLevelEncoder::Encoding currentMode) {
if (startpos >= msg.GetLength())
return currentMode;
std::array<float, kEncoderCount> charCounts;
if (currentMode == Encoding::ASCII) {
charCounts = {0, 1, 1, 1, 1, 1.25f};
} else {
charCounts = {1, 2, 2, 2, 2, 2.25f};
charCounts[EncoderIndex(currentMode)] = 0;
}
size_t charsProcessed = 0;
while (true) {
if ((startpos + charsProcessed) == msg.GetLength()) {
std::array<int32_t, kEncoderCount> intCharCounts;
std::array<uint8_t, kEncoderCount> mins;
int32_t min = FindMinimums(charCounts, &intCharCounts, &mins);
if (intCharCounts[EncoderIndex(Encoding::ASCII)] == min)
return Encoding::ASCII;
const int32_t minCount = GetMinimumCount(mins);
if (minCount == 1) {
if (mins[EncoderIndex(Encoding::BASE256)] > 0)
return Encoding::BASE256;
if (mins[EncoderIndex(Encoding::EDIFACT)] > 0)
return Encoding::EDIFACT;
if (mins[EncoderIndex(Encoding::TEXT)] > 0)
return Encoding::TEXT;
if (mins[EncoderIndex(Encoding::X12)] > 0)
return Encoding::X12;
}
return Encoding::C40;
}
wchar_t c = msg[startpos + charsProcessed];
charsProcessed++;
{
auto& count = charCounts[EncoderIndex(Encoding::ASCII)];
if (FXSYS_IsDecimalDigit(c))
count += 0.5;
else if (IsExtendedASCII(c))
count = ceilf(count) + 2;
else
count = ceilf(count) + 1;
}
{
auto& count = charCounts[EncoderIndex(Encoding::C40)];
if (IsNativeC40(c))
count += 2.0f / 3.0f;
else if (IsExtendedASCII(c))
count += 8.0f / 3.0f;
else
count += 4.0f / 3.0f;
}
{
auto& count = charCounts[EncoderIndex(Encoding::TEXT)];
if (IsNativeText(c))
count += 2.0f / 3.0f;
else if (IsExtendedASCII(c))
count += 8.0f / 3.0f;
else
count += 4.0f / 3.0f;
}
{
auto& count = charCounts[EncoderIndex(Encoding::X12)];
if (IsNativeX12(c))
count += 2.0f / 3.0f;
else if (IsExtendedASCII(c))
count += 13.0f / 3.0f;
else
count += 10.0f / 3.0f;
}
{
auto& count = charCounts[EncoderIndex(Encoding::EDIFACT)];
if (IsNativeEDIFACT(c))
count += 3.0f / 4.0f;
else if (IsExtendedASCII(c))
count += 17.0f / 4.0f;
else
count += 13.0f / 4.0f;
}
charCounts[EncoderIndex(Encoding::BASE256)]++;
if (charsProcessed < 4)
continue;
std::array<int32_t, kEncoderCount> intCharCounts;
std::array<uint8_t, kEncoderCount> mins;
FindMinimums(charCounts, &intCharCounts, &mins);
int32_t minCount = GetMinimumCount(mins);
int32_t ascii_count = intCharCounts[EncoderIndex(Encoding::ASCII)];
int32_t c40_count = intCharCounts[EncoderIndex(Encoding::C40)];
int32_t text_count = intCharCounts[EncoderIndex(Encoding::TEXT)];
int32_t x12_count = intCharCounts[EncoderIndex(Encoding::X12)];
int32_t editfact_count = intCharCounts[EncoderIndex(Encoding::EDIFACT)];
int32_t base256_count = intCharCounts[EncoderIndex(Encoding::BASE256)];
int32_t bet_min = std::min({base256_count, editfact_count, text_count});
if (ascii_count < bet_min && ascii_count < c40_count &&
ascii_count < x12_count) {
return Encoding::ASCII;
}
if (base256_count < ascii_count ||
(mins[EncoderIndex(Encoding::C40)] +
mins[EncoderIndex(Encoding::TEXT)] +
mins[EncoderIndex(Encoding::X12)] +
mins[EncoderIndex(Encoding::EDIFACT)]) == 0) {
return Encoding::BASE256;
}
if (minCount == 1) {
if (mins[EncoderIndex(Encoding::EDIFACT)] > 0)
return Encoding::EDIFACT;
if (mins[EncoderIndex(Encoding::TEXT)] > 0)
return Encoding::TEXT;
if (mins[EncoderIndex(Encoding::X12)] > 0)
return Encoding::X12;
}
if (c40_count + 1 < ascii_count && c40_count + 1 < bet_min) {
if (c40_count < x12_count)
return Encoding::C40;
if (c40_count == x12_count) {
size_t p = startpos + charsProcessed + 1;
while (p < msg.GetLength()) {
wchar_t tc = msg[p];
if (IsX12TermSep(tc))
return Encoding::X12;
if (!IsNativeX12(tc))
break;
p++;
}
return Encoding::C40;
}
}
}
}
// static
bool CBC_HighLevelEncoder::IsExtendedASCII(wchar_t ch) {
return ch >= 128 && ch <= 255;
}