// 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
// 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 "../barcode.h"
#include "../common/BC_CommonBitMatrix.h"
#include "BC_QRCoderVersion.h"
#include "BC_QRCoderFormatInformation.h"
#include "BC_QRDataMask.h"
#include "BC_QRBitMatrixParser.h"
CBC_QRBitMatrixParser::CBC_QRBitMatrixParser()
{
}
void CBC_QRBitMatrixParser::Init(CBC_CommonBitMatrix *bitMatrix, FX_INT32 &e)
{
    m_dimension = bitMatrix->GetDimension(e);
    BC_EXCEPTION_CHECK_ReturnVoid(e);
    m_tempBitMatrix = bitMatrix;
    if(m_dimension < 21 || (m_dimension & 0x03) != 1) {
        e = BCExceptionRead;
        BC_EXCEPTION_CHECK_ReturnVoid(e);
    }
    m_bitMatrix = m_tempBitMatrix;
    m_parsedFormatInfo = NULL;
    m_version = NULL;
}
CBC_QRBitMatrixParser::~CBC_QRBitMatrixParser()
{
    if(m_parsedFormatInfo != NULL) {
        delete m_parsedFormatInfo;
        m_parsedFormatInfo = NULL;
    }
    m_version = NULL;
}
CBC_QRCoderFormatInformation* CBC_QRBitMatrixParser::ReadFormatInformation(FX_INT32 &e)
{
    if(m_parsedFormatInfo != NULL) {
        return m_parsedFormatInfo;
    }
    FX_INT32 formatInfoBits = 0;
    FX_INT32 j;
    for( j = 0; j < 6; j++) {
        formatInfoBits = CopyBit(8, j, formatInfoBits);
    }
    formatInfoBits = CopyBit(8, 7, formatInfoBits);
    formatInfoBits = CopyBit(8, 8, formatInfoBits);
    formatInfoBits = CopyBit(7, 8, formatInfoBits);
    for(FX_INT32 i = 5; i >= 0; i--) {
        formatInfoBits = CopyBit(i, 8, formatInfoBits);
    }
    m_parsedFormatInfo = CBC_QRCoderFormatInformation::DecodeFormatInformation(formatInfoBits);
    if(m_parsedFormatInfo != NULL) {
        return m_parsedFormatInfo;
    }
    FX_INT32 dimension = m_bitMatrix->GetDimension(e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    formatInfoBits = 0;
    FX_INT32 iMin = dimension - 8;
    for(j = dimension - 1; j >= iMin; j--) {
        formatInfoBits = CopyBit(j, 8, formatInfoBits);
    }
    for(FX_INT32 k = dimension - 7; k < dimension; k++) {
        formatInfoBits = CopyBit(8, k , formatInfoBits);
    }
    m_parsedFormatInfo = CBC_QRCoderFormatInformation::DecodeFormatInformation(formatInfoBits);
    if(m_parsedFormatInfo != NULL) {
        return m_parsedFormatInfo;
    }
    e = BCExceptionRead;
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    return NULL;
}
CBC_QRCoderVersion* CBC_QRBitMatrixParser::ReadVersion(FX_INT32 &e)
{
    if(m_version != NULL) {
        return m_version;
    }
    FX_INT32 dimension = m_bitMatrix->GetDimension(e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    FX_INT32 provisionVersion = (dimension - 17) >> 2;
    if(provisionVersion <= 6) {
        CBC_QRCoderVersion* qrv = CBC_QRCoderVersion::GetVersionForNumber(provisionVersion, e);
        BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
        return qrv;
    }
    FX_INT32 versionBits = 0;
    for (FX_INT32 i = 5; i >= 0; i--) {
        FX_INT32 jMin = dimension - 11;
        for (FX_INT32 j = dimension - 9; j >= jMin; j--) {
            versionBits = CopyBit(i, j, versionBits);
        }
    }
    m_version = CBC_QRCoderVersion::DecodeVersionInformation(versionBits, e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    if (m_version != NULL && m_version->GetDimensionForVersion() == dimension) {
        return m_version;
    }
    versionBits = 0;
    for (FX_INT32 j = 5; j >= 0; j--) {
        FX_INT32 iMin = dimension - 11;
        for (FX_INT32 i = dimension - 9; i >= iMin; i--) {
            versionBits = CopyBit(i, j, versionBits);
        }
    }
    m_version = CBC_QRCoderVersion::DecodeVersionInformation(versionBits, e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    if (m_version != NULL && m_version->GetDimensionForVersion() == dimension) {
        return m_version;
    }
    e = BCExceptionRead;
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    return NULL;
}
FX_INT32 CBC_QRBitMatrixParser::CopyBit(FX_INT32 i, FX_INT32 j, FX_INT32 versionBits)
{
    return m_bitMatrix->Get(j, i) ? (versionBits << 1) | 0x1 : versionBits << 1;
}
CFX_ByteArray* CBC_QRBitMatrixParser::ReadCodewords(FX_INT32 &e)
{
    CBC_QRCoderFormatInformation *formatInfo   = ReadFormatInformation(e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL)
    CBC_QRCoderVersion			  *version		= ReadVersion(e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    CBC_QRDataMask		  *dataMask		= CBC_QRDataMask::ForReference((FX_INT32)(formatInfo->GetDataMask()), e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    FX_INT32				  dimension		= m_bitMatrix->GetDimension(e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    dataMask->UnmaskBitMatirx(m_bitMatrix, dimension);
    CBC_CommonBitMatrix* cbm = version->BuildFunctionPattern(e);
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    CBC_AutoPtr<CBC_CommonBitMatrix > functionPattern(cbm);
    FX_BOOL			  readingUp		= TRUE;
    CFX_ByteArray * temp = FX_NEW CFX_ByteArray;
    temp->SetSize(version->GetTotalCodeWords());
    CBC_AutoPtr<CFX_ByteArray> result(temp);
    FX_INT32				   resultOffset = 0;
    FX_INT32				   currentByte	= 0;
    FX_INT32				   bitsRead		= 0;
    for(FX_INT32 j = dimension - 1; j > 0; j -= 2) {
        if(j == 6) {
            j--;
        }
        for(FX_INT32 count = 0; count < dimension; count++) {
            FX_INT32 i = readingUp ? dimension - 1 - count : count;
            for(FX_INT32 col = 0; col < 2; col++) {
                if(!functionPattern->Get(j - col, i)) {
                    bitsRead++;
                    currentByte <<= 1;
                    if(m_bitMatrix->Get(j - col, i)) {
                        currentByte |= 1;
                    }
                    if(bitsRead == 8) {
                        (*result)[resultOffset++] = (FX_BYTE) currentByte;
                        bitsRead = 0;
                        currentByte = 0;
                    }
                }
            }
        }
        readingUp ^= TRUE;
    }
    if(resultOffset != version->GetTotalCodeWords()) {
        e = BCExceptionRead;
        BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
    }
    return result.release();
}