| // Copyright 2015 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 "core/fxcodec/jbig2/JBig2_TrdProc.h" |
| |
| #include <memory> |
| |
| #include "core/fxcodec/jbig2/JBig2_ArithDecoder.h" |
| #include "core/fxcodec/jbig2/JBig2_ArithIntDecoder.h" |
| #include "core/fxcodec/jbig2/JBig2_GrrdProc.h" |
| #include "core/fxcodec/jbig2/JBig2_HuffmanDecoder.h" |
| |
| CJBig2_Image* CJBig2_TRDProc::decode_Huffman(CJBig2_BitStream* pStream, |
| JBig2ArithCtx* grContext) { |
| std::unique_ptr<CJBig2_HuffmanDecoder> pHuffmanDecoder( |
| new CJBig2_HuffmanDecoder(pStream)); |
| std::unique_ptr<CJBig2_Image> SBREG(new CJBig2_Image(SBW, SBH)); |
| SBREG->fill(SBDEFPIXEL); |
| int32_t STRIPT; |
| if (pHuffmanDecoder->decodeAValue(SBHUFFDT, &STRIPT) != 0) |
| return nullptr; |
| |
| STRIPT *= SBSTRIPS; |
| STRIPT = -STRIPT; |
| uint32_t NINSTANCES = 0; |
| while (NINSTANCES < SBNUMINSTANCES) { |
| int32_t DT; |
| if (pHuffmanDecoder->decodeAValue(SBHUFFDT, &DT) != 0) |
| return nullptr; |
| |
| DT *= SBSTRIPS; |
| STRIPT = STRIPT + DT; |
| bool bFirst = true; |
| int32_t FIRSTS = 0; |
| int32_t CURS = 0; |
| for (;;) { |
| if (bFirst) { |
| int32_t DFS; |
| if (pHuffmanDecoder->decodeAValue(SBHUFFFS, &DFS) != 0) |
| return nullptr; |
| |
| FIRSTS = FIRSTS + DFS; |
| CURS = FIRSTS; |
| bFirst = false; |
| } else { |
| int32_t IDS; |
| int32_t nVal = pHuffmanDecoder->decodeAValue(SBHUFFDS, &IDS); |
| if (nVal == JBIG2_OOB) { |
| break; |
| } else if (nVal != 0) { |
| return nullptr; |
| } else { |
| CURS = CURS + IDS + SBDSOFFSET; |
| } |
| } |
| uint8_t CURT = 0; |
| if (SBSTRIPS != 1) { |
| uint32_t nTmp = 1; |
| while ((uint32_t)(1 << nTmp) < SBSTRIPS) { |
| nTmp++; |
| } |
| int32_t nVal; |
| if (pStream->readNBits(nTmp, &nVal) != 0) |
| return nullptr; |
| |
| CURT = nVal; |
| } |
| int32_t TI = STRIPT + CURT; |
| int32_t nVal = 0; |
| int32_t nBits = 0; |
| uint32_t IDI; |
| for (;;) { |
| uint32_t nTmp; |
| if (pStream->read1Bit(&nTmp) != 0) |
| return nullptr; |
| |
| nVal = (nVal << 1) | nTmp; |
| nBits++; |
| for (IDI = 0; IDI < SBNUMSYMS; IDI++) { |
| if ((nBits == SBSYMCODES[IDI].codelen) && |
| (nVal == SBSYMCODES[IDI].code)) { |
| break; |
| } |
| } |
| if (IDI < SBNUMSYMS) { |
| break; |
| } |
| } |
| FX_BOOL RI = 0; |
| if (SBREFINE != 0 && pStream->read1Bit(&RI) != 0) { |
| return nullptr; |
| } |
| CJBig2_Image* IBI = nullptr; |
| if (RI == 0) { |
| IBI = SBSYMS[IDI]; |
| } else { |
| int32_t RDWI; |
| int32_t RDHI; |
| int32_t RDXI; |
| int32_t RDYI; |
| if ((pHuffmanDecoder->decodeAValue(SBHUFFRDW, &RDWI) != 0) || |
| (pHuffmanDecoder->decodeAValue(SBHUFFRDH, &RDHI) != 0) || |
| (pHuffmanDecoder->decodeAValue(SBHUFFRDX, &RDXI) != 0) || |
| (pHuffmanDecoder->decodeAValue(SBHUFFRDY, &RDYI) != 0) || |
| (pHuffmanDecoder->decodeAValue(SBHUFFRSIZE, &nVal) != 0)) { |
| return nullptr; |
| } |
| pStream->alignByte(); |
| uint32_t nTmp = pStream->getOffset(); |
| CJBig2_Image* IBOI = SBSYMS[IDI]; |
| if (!IBOI) |
| return nullptr; |
| |
| uint32_t WOI = IBOI->m_nWidth; |
| uint32_t HOI = IBOI->m_nHeight; |
| if ((int)(WOI + RDWI) < 0 || (int)(HOI + RDHI) < 0) |
| return nullptr; |
| |
| std::unique_ptr<CJBig2_GRRDProc> pGRRD(new CJBig2_GRRDProc()); |
| pGRRD->GRW = WOI + RDWI; |
| pGRRD->GRH = HOI + RDHI; |
| pGRRD->GRTEMPLATE = SBRTEMPLATE; |
| pGRRD->GRREFERENCE = IBOI; |
| pGRRD->GRREFERENCEDX = (RDWI >> 2) + RDXI; |
| pGRRD->GRREFERENCEDY = (RDHI >> 2) + RDYI; |
| pGRRD->TPGRON = 0; |
| pGRRD->GRAT[0] = SBRAT[0]; |
| pGRRD->GRAT[1] = SBRAT[1]; |
| pGRRD->GRAT[2] = SBRAT[2]; |
| pGRRD->GRAT[3] = SBRAT[3]; |
| |
| { |
| std::unique_ptr<CJBig2_ArithDecoder> pArithDecoder( |
| new CJBig2_ArithDecoder(pStream)); |
| IBI = pGRRD->decode(pArithDecoder.get(), grContext); |
| if (!IBI) |
| return nullptr; |
| } |
| |
| pStream->alignByte(); |
| pStream->offset(2); |
| if ((uint32_t)nVal != (pStream->getOffset() - nTmp)) { |
| delete IBI; |
| return nullptr; |
| } |
| } |
| if (!IBI) { |
| continue; |
| } |
| uint32_t WI = IBI->m_nWidth; |
| uint32_t HI = IBI->m_nHeight; |
| if (TRANSPOSED == 0 && ((REFCORNER == JBIG2_CORNER_TOPRIGHT) || |
| (REFCORNER == JBIG2_CORNER_BOTTOMRIGHT))) { |
| CURS = CURS + WI - 1; |
| } else if (TRANSPOSED == 1 && ((REFCORNER == JBIG2_CORNER_BOTTOMLEFT) || |
| (REFCORNER == JBIG2_CORNER_BOTTOMRIGHT))) { |
| CURS = CURS + HI - 1; |
| } |
| int32_t SI = CURS; |
| if (TRANSPOSED == 0) { |
| switch (REFCORNER) { |
| case JBIG2_CORNER_TOPLEFT: |
| SBREG->composeFrom(SI, TI, IBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_TOPRIGHT: |
| SBREG->composeFrom(SI - WI + 1, TI, IBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_BOTTOMLEFT: |
| SBREG->composeFrom(SI, TI - HI + 1, IBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_BOTTOMRIGHT: |
| SBREG->composeFrom(SI - WI + 1, TI - HI + 1, IBI, SBCOMBOP); |
| break; |
| } |
| } else { |
| switch (REFCORNER) { |
| case JBIG2_CORNER_TOPLEFT: |
| SBREG->composeFrom(TI, SI, IBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_TOPRIGHT: |
| SBREG->composeFrom(TI - WI + 1, SI, IBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_BOTTOMLEFT: |
| SBREG->composeFrom(TI, SI - HI + 1, IBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_BOTTOMRIGHT: |
| SBREG->composeFrom(TI - WI + 1, SI - HI + 1, IBI, SBCOMBOP); |
| break; |
| } |
| } |
| if (RI != 0) { |
| delete IBI; |
| } |
| if (TRANSPOSED == 0 && ((REFCORNER == JBIG2_CORNER_TOPLEFT) || |
| (REFCORNER == JBIG2_CORNER_BOTTOMLEFT))) { |
| CURS = CURS + WI - 1; |
| } else if (TRANSPOSED == 1 && ((REFCORNER == JBIG2_CORNER_TOPLEFT) || |
| (REFCORNER == JBIG2_CORNER_TOPRIGHT))) { |
| CURS = CURS + HI - 1; |
| } |
| NINSTANCES = NINSTANCES + 1; |
| } |
| } |
| return SBREG.release(); |
| } |
| |
| CJBig2_Image* CJBig2_TRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder, |
| JBig2ArithCtx* grContext, |
| JBig2IntDecoderState* pIDS) { |
| std::unique_ptr<CJBig2_ArithIntDecoder> IADT; |
| std::unique_ptr<CJBig2_ArithIntDecoder> IAFS; |
| std::unique_ptr<CJBig2_ArithIntDecoder> IADS; |
| std::unique_ptr<CJBig2_ArithIntDecoder> IAIT; |
| std::unique_ptr<CJBig2_ArithIntDecoder> IARI; |
| std::unique_ptr<CJBig2_ArithIntDecoder> IARDW; |
| std::unique_ptr<CJBig2_ArithIntDecoder> IARDH; |
| std::unique_ptr<CJBig2_ArithIntDecoder> IARDX; |
| std::unique_ptr<CJBig2_ArithIntDecoder> IARDY; |
| std::unique_ptr<CJBig2_ArithIaidDecoder> IAID; |
| CJBig2_ArithIntDecoder* pIADT; |
| CJBig2_ArithIntDecoder* pIAFS; |
| CJBig2_ArithIntDecoder* pIADS; |
| CJBig2_ArithIntDecoder* pIAIT; |
| CJBig2_ArithIntDecoder* pIARI; |
| CJBig2_ArithIntDecoder* pIARDW; |
| CJBig2_ArithIntDecoder* pIARDH; |
| CJBig2_ArithIntDecoder* pIARDX; |
| CJBig2_ArithIntDecoder* pIARDY; |
| CJBig2_ArithIaidDecoder* pIAID; |
| if (pIDS) { |
| pIADT = pIDS->IADT; |
| pIAFS = pIDS->IAFS; |
| pIADS = pIDS->IADS; |
| pIAIT = pIDS->IAIT; |
| pIARI = pIDS->IARI; |
| pIARDW = pIDS->IARDW; |
| pIARDH = pIDS->IARDH; |
| pIARDX = pIDS->IARDX; |
| pIARDY = pIDS->IARDY; |
| pIAID = pIDS->IAID; |
| } else { |
| IADT.reset(new CJBig2_ArithIntDecoder()); |
| IAFS.reset(new CJBig2_ArithIntDecoder()); |
| IADS.reset(new CJBig2_ArithIntDecoder()); |
| IAIT.reset(new CJBig2_ArithIntDecoder()); |
| IARI.reset(new CJBig2_ArithIntDecoder()); |
| IARDW.reset(new CJBig2_ArithIntDecoder()); |
| IARDH.reset(new CJBig2_ArithIntDecoder()); |
| IARDX.reset(new CJBig2_ArithIntDecoder()); |
| IARDY.reset(new CJBig2_ArithIntDecoder()); |
| IAID.reset(new CJBig2_ArithIaidDecoder(SBSYMCODELEN)); |
| pIADT = IADT.get(); |
| pIAFS = IAFS.get(); |
| pIADS = IADS.get(); |
| pIAIT = IAIT.get(); |
| pIARI = IARI.get(); |
| pIARDW = IARDW.get(); |
| pIARDH = IARDH.get(); |
| pIARDX = IARDX.get(); |
| pIARDY = IARDY.get(); |
| pIAID = IAID.get(); |
| } |
| std::unique_ptr<CJBig2_Image> SBREG(new CJBig2_Image(SBW, SBH)); |
| SBREG->fill(SBDEFPIXEL); |
| int32_t STRIPT; |
| pIADT->decode(pArithDecoder, &STRIPT); |
| STRIPT *= SBSTRIPS; |
| STRIPT = -STRIPT; |
| int32_t FIRSTS = 0; |
| uint32_t NINSTANCES = 0; |
| while (NINSTANCES < SBNUMINSTANCES) { |
| int32_t CURS = 0; |
| int32_t DT; |
| pIADT->decode(pArithDecoder, &DT); |
| DT *= SBSTRIPS; |
| STRIPT += DT; |
| bool bFirst = true; |
| for (;;) { |
| if (bFirst) { |
| int32_t DFS; |
| pIAFS->decode(pArithDecoder, &DFS); |
| FIRSTS += DFS; |
| CURS = FIRSTS; |
| bFirst = false; |
| } else { |
| int32_t IDS; |
| if (!pIADS->decode(pArithDecoder, &IDS)) |
| break; |
| CURS += IDS + SBDSOFFSET; |
| } |
| if (NINSTANCES >= SBNUMINSTANCES) { |
| break; |
| } |
| int CURT = 0; |
| if (SBSTRIPS != 1) |
| pIAIT->decode(pArithDecoder, &CURT); |
| |
| int32_t TI = STRIPT + CURT; |
| uint32_t IDI; |
| pIAID->decode(pArithDecoder, &IDI); |
| if (IDI >= SBNUMSYMS) |
| return nullptr; |
| |
| int RI; |
| if (SBREFINE == 0) |
| RI = 0; |
| else |
| pIARI->decode(pArithDecoder, &RI); |
| |
| std::unique_ptr<CJBig2_Image> IBI; |
| CJBig2_Image* pIBI; |
| if (RI == 0) { |
| pIBI = SBSYMS[IDI]; |
| } else { |
| int32_t RDWI; |
| int32_t RDHI; |
| int32_t RDXI; |
| int32_t RDYI; |
| pIARDW->decode(pArithDecoder, &RDWI); |
| pIARDH->decode(pArithDecoder, &RDHI); |
| pIARDX->decode(pArithDecoder, &RDXI); |
| pIARDY->decode(pArithDecoder, &RDYI); |
| CJBig2_Image* IBOI = SBSYMS[IDI]; |
| uint32_t WOI = IBOI->m_nWidth; |
| uint32_t HOI = IBOI->m_nHeight; |
| if ((int)(WOI + RDWI) < 0 || (int)(HOI + RDHI) < 0) { |
| return nullptr; |
| } |
| std::unique_ptr<CJBig2_GRRDProc> pGRRD(new CJBig2_GRRDProc()); |
| pGRRD->GRW = WOI + RDWI; |
| pGRRD->GRH = HOI + RDHI; |
| pGRRD->GRTEMPLATE = SBRTEMPLATE; |
| pGRRD->GRREFERENCE = IBOI; |
| pGRRD->GRREFERENCEDX = (RDWI >> 1) + RDXI; |
| pGRRD->GRREFERENCEDY = (RDHI >> 1) + RDYI; |
| pGRRD->TPGRON = 0; |
| pGRRD->GRAT[0] = SBRAT[0]; |
| pGRRD->GRAT[1] = SBRAT[1]; |
| pGRRD->GRAT[2] = SBRAT[2]; |
| pGRRD->GRAT[3] = SBRAT[3]; |
| IBI.reset(pGRRD->decode(pArithDecoder, grContext)); |
| pIBI = IBI.get(); |
| } |
| if (!pIBI) |
| return nullptr; |
| |
| uint32_t WI = pIBI->m_nWidth; |
| uint32_t HI = pIBI->m_nHeight; |
| if (TRANSPOSED == 0 && ((REFCORNER == JBIG2_CORNER_TOPRIGHT) || |
| (REFCORNER == JBIG2_CORNER_BOTTOMRIGHT))) { |
| CURS += WI - 1; |
| } else if (TRANSPOSED == 1 && ((REFCORNER == JBIG2_CORNER_BOTTOMLEFT) || |
| (REFCORNER == JBIG2_CORNER_BOTTOMRIGHT))) { |
| CURS += HI - 1; |
| } |
| int32_t SI = CURS; |
| if (TRANSPOSED == 0) { |
| switch (REFCORNER) { |
| case JBIG2_CORNER_TOPLEFT: |
| SBREG->composeFrom(SI, TI, pIBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_TOPRIGHT: |
| SBREG->composeFrom(SI - WI + 1, TI, pIBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_BOTTOMLEFT: |
| SBREG->composeFrom(SI, TI - HI + 1, pIBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_BOTTOMRIGHT: |
| SBREG->composeFrom(SI - WI + 1, TI - HI + 1, pIBI, SBCOMBOP); |
| break; |
| } |
| } else { |
| switch (REFCORNER) { |
| case JBIG2_CORNER_TOPLEFT: |
| SBREG->composeFrom(TI, SI, pIBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_TOPRIGHT: |
| SBREG->composeFrom(TI - WI + 1, SI, pIBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_BOTTOMLEFT: |
| SBREG->composeFrom(TI, SI - HI + 1, pIBI, SBCOMBOP); |
| break; |
| case JBIG2_CORNER_BOTTOMRIGHT: |
| SBREG->composeFrom(TI - WI + 1, SI - HI + 1, pIBI, SBCOMBOP); |
| break; |
| } |
| } |
| if (TRANSPOSED == 0 && ((REFCORNER == JBIG2_CORNER_TOPLEFT) || |
| (REFCORNER == JBIG2_CORNER_BOTTOMLEFT))) { |
| CURS += WI - 1; |
| } else if (TRANSPOSED == 1 && ((REFCORNER == JBIG2_CORNER_TOPLEFT) || |
| (REFCORNER == JBIG2_CORNER_TOPRIGHT))) { |
| CURS += HI - 1; |
| } |
| ++NINSTANCES; |
| } |
| } |
| return SBREG.release(); |
| } |
