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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 2007 ZXing authors
*
* 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/qrcode/BC_QRCoderBitVector.h"
#include "core/fxcrt/check.h"
#include "core/fxcrt/fx_system.h"
CBC_QRCoderBitVector::CBC_QRCoderBitVector() = default;
CBC_QRCoderBitVector::~CBC_QRCoderBitVector() = default;
int32_t CBC_QRCoderBitVector::At(size_t index) const {
CHECK(index < m_sizeInBits);
int32_t value = m_array[index >> 3] & 0xff;
return (value >> (7 - (index & 0x7))) & 1;
}
size_t CBC_QRCoderBitVector::sizeInBytes() const {
return (m_sizeInBits + 7) >> 3;
}
size_t CBC_QRCoderBitVector::Size() const {
return m_sizeInBits;
}
void CBC_QRCoderBitVector::AppendBit(int32_t bit) {
DCHECK(bit == 0 || bit == 1);
int32_t numBitsInLastByte = m_sizeInBits & 0x7;
if (numBitsInLastByte == 0) {
AppendByte(0);
m_sizeInBits -= 8;
}
m_array[m_sizeInBits >> 3] |= (bit << (7 - numBitsInLastByte));
++m_sizeInBits;
}
void CBC_QRCoderBitVector::AppendBits(int32_t value, int32_t numBits) {
DCHECK(numBits > 0);
DCHECK(numBits <= 32);
int32_t numBitsLeft = numBits;
while (numBitsLeft > 0) {
if ((m_sizeInBits & 0x7) == 0 && numBitsLeft >= 8) {
AppendByte(static_cast<int8_t>((value >> (numBitsLeft - 8)) & 0xff));
numBitsLeft -= 8;
} else {
AppendBit((value >> (numBitsLeft - 1)) & 1);
--numBitsLeft;
}
}
}
void CBC_QRCoderBitVector::AppendBitVector(const CBC_QRCoderBitVector* bits) {
for (size_t i = 0; i < bits->Size(); i++)
AppendBit(bits->At(i));
}
bool CBC_QRCoderBitVector::XOR(const CBC_QRCoderBitVector* other) {
if (m_sizeInBits != other->Size())
return false;
pdfium::span<const uint8_t> other_span = other->GetArray();
for (size_t i = 0; i < sizeInBytes(); ++i)
m_array[i] ^= other_span[i];
return true;
}
pdfium::span<const uint8_t> CBC_QRCoderBitVector::GetArray() const {
return m_array;
}
void CBC_QRCoderBitVector::AppendByte(int8_t value) {
if ((m_sizeInBits >> 3) == m_array.size())
m_array.push_back(0);
m_array[m_sizeInBits >> 3] = value;
m_sizeInBits += 8;
}