| // 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" |
| #include "core/fxcrt/fx_safe_types.h" |
| #include "core/fxcrt/maybe_owned.h" |
| #include "third_party/base/optional.h" |
| #include "third_party/base/ptr_util.h" |
| |
| namespace { |
| |
| Optional<uint32_t> CheckTRDDimension(uint32_t dimension, int32_t delta) { |
| FX_SAFE_UINT32 result = dimension; |
| result += delta; |
| if (!result.IsValid()) |
| return {}; |
| return {result.ValueOrDie()}; |
| } |
| |
| Optional<int32_t> CheckTRDReferenceDimension(int32_t dimension, |
| uint32_t shift, |
| int32_t offset) { |
| FX_SAFE_INT32 result = offset; |
| result += dimension >> shift; |
| if (!result.IsValid()) |
| return {}; |
| return {result.ValueOrDie()}; |
| } |
| |
| } // namespace |
| |
| CJBig2_TRDProc::CJBig2_TRDProc() {} |
| |
| CJBig2_TRDProc::~CJBig2_TRDProc() {} |
| |
| std::unique_ptr<CJBig2_Image> CJBig2_TRDProc::DecodeHuffman( |
| CJBig2_BitStream* pStream, |
| JBig2ArithCtx* grContext) { |
| auto SBREG = pdfium::MakeUnique<CJBig2_Image>(SBW, SBH); |
| if (!SBREG->data()) |
| return nullptr; |
| |
| SBREG->Fill(SBDEFPIXEL); |
| int32_t INITIAL_STRIPT; |
| auto pHuffmanDecoder = pdfium::MakeUnique<CJBig2_HuffmanDecoder>(pStream); |
| if (pHuffmanDecoder->DecodeAValue(SBHUFFDT, &INITIAL_STRIPT) != 0) |
| return nullptr; |
| |
| FX_SAFE_INT32 STRIPT = INITIAL_STRIPT; |
| STRIPT *= SBSTRIPS; |
| STRIPT = -STRIPT; |
| FX_SAFE_INT32 FIRSTS = 0; |
| uint32_t NINSTANCES = 0; |
| while (NINSTANCES < SBNUMINSTANCES) { |
| int32_t INITIAL_DT; |
| if (pHuffmanDecoder->DecodeAValue(SBHUFFDT, &INITIAL_DT) != 0) |
| return nullptr; |
| |
| FX_SAFE_INT32 DT = INITIAL_DT; |
| DT *= SBSTRIPS; |
| STRIPT += DT; |
| bool bFirst = true; |
| FX_SAFE_INT32 CURS = 0; |
| for (;;) { |
| if (bFirst) { |
| int32_t DFS; |
| if (pHuffmanDecoder->DecodeAValue(SBHUFFFS, &DFS) != 0) |
| return nullptr; |
| |
| FIRSTS += DFS; |
| CURS = FIRSTS; |
| bFirst = false; |
| } else { |
| int32_t IDS; |
| int32_t nVal = pHuffmanDecoder->DecodeAValue(SBHUFFDS, &IDS); |
| if (nVal == JBIG2_OOB) |
| break; |
| |
| if (nVal != 0) |
| return nullptr; |
| |
| CURS += IDS; |
| CURS += SBDSOFFSET; |
| } |
| uint8_t CURT = 0; |
| if (SBSTRIPS != 1) { |
| uint32_t nTmp = 1; |
| while (static_cast<uint32_t>(1 << nTmp) < SBSTRIPS) |
| ++nTmp; |
| int32_t nVal; |
| if (pStream->readNBits(nTmp, &nVal) != 0) |
| return nullptr; |
| |
| CURT = nVal; |
| } |
| FX_SAFE_INT32 SAFE_TI = STRIPT + CURT; |
| if (!SAFE_TI.IsValid()) |
| return nullptr; |
| |
| int32_t TI = SAFE_TI.ValueOrDie(); |
| FX_SAFE_INT32 nSafeVal = 0; |
| int32_t nBits = 0; |
| uint32_t IDI; |
| for (;;) { |
| uint32_t nTmp; |
| if (pStream->read1Bit(&nTmp) != 0) |
| return nullptr; |
| |
| nSafeVal <<= 1; |
| if (!nSafeVal.IsValid()) |
| return nullptr; |
| |
| nSafeVal |= nTmp; |
| ++nBits; |
| const int32_t nVal = nSafeVal.ValueOrDie(); |
| for (IDI = 0; IDI < SBNUMSYMS; ++IDI) { |
| if (nBits == SBSYMCODES[IDI].codelen && nVal == SBSYMCODES[IDI].code) |
| break; |
| } |
| if (IDI < SBNUMSYMS) |
| break; |
| } |
| bool RI = 0; |
| if (SBREFINE != 0 && pStream->read1Bit(&RI) != 0) |
| return nullptr; |
| |
| MaybeOwned<CJBig2_Image> IBI; |
| if (RI == 0) { |
| IBI = SBSYMS[IDI]; |
| } else { |
| int32_t RDWI; |
| int32_t RDHI; |
| int32_t RDXI; |
| int32_t RDYI; |
| int32_t HUFFRSIZE; |
| if ((pHuffmanDecoder->DecodeAValue(SBHUFFRDW, &RDWI) != 0) || |
| (pHuffmanDecoder->DecodeAValue(SBHUFFRDH, &RDHI) != 0) || |
| (pHuffmanDecoder->DecodeAValue(SBHUFFRDX, &RDXI) != 0) || |
| (pHuffmanDecoder->DecodeAValue(SBHUFFRDY, &RDYI) != 0) || |
| (pHuffmanDecoder->DecodeAValue(SBHUFFRSIZE, &HUFFRSIZE) != 0)) { |
| return nullptr; |
| } |
| pStream->alignByte(); |
| uint32_t nTmp = pStream->getOffset(); |
| CJBig2_Image* IBOI = SBSYMS[IDI]; |
| if (!IBOI) |
| return nullptr; |
| |
| Optional<uint32_t> WOI = CheckTRDDimension(IBOI->width(), RDWI); |
| Optional<uint32_t> HOI = CheckTRDDimension(IBOI->height(), RDHI); |
| if (!WOI || !HOI) |
| return nullptr; |
| |
| Optional<int32_t> GRREFERENCEDX = |
| CheckTRDReferenceDimension(RDWI, 2, RDXI); |
| Optional<int32_t> GRREFERENCEDY = |
| CheckTRDReferenceDimension(RDHI, 2, RDYI); |
| if (!GRREFERENCEDX || !GRREFERENCEDY) |
| return nullptr; |
| |
| auto pGRRD = pdfium::MakeUnique<CJBig2_GRRDProc>(); |
| pGRRD->GRW = WOI.value(); |
| pGRRD->GRH = HOI.value(); |
| pGRRD->GRTEMPLATE = SBRTEMPLATE; |
| pGRRD->GRREFERENCE = IBOI; |
| pGRRD->GRREFERENCEDX = GRREFERENCEDX.value(); |
| pGRRD->GRREFERENCEDY = GRREFERENCEDY.value(); |
| pGRRD->TPGRON = 0; |
| pGRRD->GRAT[0] = SBRAT[0]; |
| pGRRD->GRAT[1] = SBRAT[1]; |
| pGRRD->GRAT[2] = SBRAT[2]; |
| pGRRD->GRAT[3] = SBRAT[3]; |
| |
| auto pArithDecoder = pdfium::MakeUnique<CJBig2_ArithDecoder>(pStream); |
| IBI = pGRRD->Decode(pArithDecoder.get(), grContext); |
| if (!IBI) |
| return nullptr; |
| |
| pStream->alignByte(); |
| pStream->offset(2); |
| if (static_cast<uint32_t>(HUFFRSIZE) != (pStream->getOffset() - nTmp)) |
| return nullptr; |
| } |
| if (!IBI) |
| continue; |
| |
| uint32_t WI = IBI->width(); |
| uint32_t HI = IBI->height(); |
| 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; |
| } |
| if (!CURS.IsValid()) |
| return nullptr; |
| |
| int32_t SI = CURS.ValueOrDie(); |
| ComposeData compose = GetComposeData(SI, TI, WI, HI); |
| IBI.Get()->ComposeTo(SBREG.get(), compose.x, compose.y, SBCOMBOP); |
| if (compose.increment) |
| CURS += compose.increment; |
| ++NINSTANCES; |
| } |
| } |
| return SBREG; |
| } |
| |
| std::unique_ptr<CJBig2_Image> CJBig2_TRDProc::DecodeArith( |
| CJBig2_ArithDecoder* pArithDecoder, |
| JBig2ArithCtx* grContext, |
| JBig2IntDecoderState* pIDS) { |
| auto SBREG = pdfium::MakeUnique<CJBig2_Image>(SBW, SBH); |
| if (!SBREG->data()) |
| return nullptr; |
| |
| MaybeOwned<CJBig2_ArithIntDecoder> pIADT; |
| if (pIDS) |
| pIADT = pIDS->IADT; |
| else |
| pIADT = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| int32_t INITIAL_STRIPT; |
| if (!pIADT->Decode(pArithDecoder, &INITIAL_STRIPT)) |
| return nullptr; |
| |
| MaybeOwned<CJBig2_ArithIntDecoder> pIAFS; |
| MaybeOwned<CJBig2_ArithIntDecoder> pIADS; |
| MaybeOwned<CJBig2_ArithIntDecoder> pIAIT; |
| MaybeOwned<CJBig2_ArithIntDecoder> pIARI; |
| MaybeOwned<CJBig2_ArithIntDecoder> pIARDW; |
| MaybeOwned<CJBig2_ArithIntDecoder> pIARDH; |
| MaybeOwned<CJBig2_ArithIntDecoder> pIARDX; |
| MaybeOwned<CJBig2_ArithIntDecoder> pIARDY; |
| MaybeOwned<CJBig2_ArithIaidDecoder> pIAID; |
| if (pIDS) { |
| 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 { |
| pIAFS = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| pIADS = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| pIAIT = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| pIARI = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| pIARDW = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| pIARDH = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| pIARDX = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| pIARDY = pdfium::MakeUnique<CJBig2_ArithIntDecoder>(); |
| pIAID = pdfium::MakeUnique<CJBig2_ArithIaidDecoder>(SBSYMCODELEN); |
| } |
| |
| SBREG->Fill(SBDEFPIXEL); |
| |
| FX_SAFE_INT32 STRIPT = INITIAL_STRIPT; |
| STRIPT *= SBSTRIPS; |
| STRIPT = -STRIPT; |
| FX_SAFE_INT32 FIRSTS = 0; |
| uint32_t NINSTANCES = 0; |
| while (NINSTANCES < SBNUMINSTANCES) { |
| FX_SAFE_INT32 CURS = 0; |
| int32_t INITIAL_DT; |
| if (!pIADT->Decode(pArithDecoder, &INITIAL_DT)) |
| return nullptr; |
| |
| FX_SAFE_INT32 DT = INITIAL_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; |
| CURS += SBDSOFFSET; |
| } |
| if (NINSTANCES >= SBNUMINSTANCES) |
| break; |
| |
| int CURT = 0; |
| if (SBSTRIPS != 1) |
| pIAIT->Decode(pArithDecoder, &CURT); |
| |
| FX_SAFE_INT32 SAFE_TI = STRIPT + CURT; |
| if (!SAFE_TI.IsValid()) |
| return nullptr; |
| |
| int32_t TI = SAFE_TI.ValueOrDie(); |
| uint32_t IDI; |
| pIAID->Decode(pArithDecoder, &IDI); |
| if (IDI >= SBNUMSYMS) |
| return nullptr; |
| |
| int RI; |
| if (SBREFINE == 0) |
| RI = 0; |
| else |
| pIARI->Decode(pArithDecoder, &RI); |
| |
| MaybeOwned<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]; |
| if (!IBOI) |
| return nullptr; |
| |
| Optional<uint32_t> WOI = CheckTRDDimension(IBOI->width(), RDWI); |
| Optional<uint32_t> HOI = CheckTRDDimension(IBOI->height(), RDHI); |
| if (!WOI || !HOI) |
| return nullptr; |
| |
| Optional<int32_t> GRREFERENCEDX = |
| CheckTRDReferenceDimension(RDWI, 1, RDXI); |
| Optional<int32_t> GRREFERENCEDY = |
| CheckTRDReferenceDimension(RDHI, 1, RDYI); |
| if (!GRREFERENCEDX || !GRREFERENCEDY) |
| return nullptr; |
| |
| auto pGRRD = pdfium::MakeUnique<CJBig2_GRRDProc>(); |
| pGRRD->GRW = WOI.value(); |
| pGRRD->GRH = HOI.value(); |
| pGRRD->GRTEMPLATE = SBRTEMPLATE; |
| pGRRD->GRREFERENCE = IBOI; |
| pGRRD->GRREFERENCEDX = GRREFERENCEDX.value(); |
| pGRRD->GRREFERENCEDY = GRREFERENCEDY.value(); |
| pGRRD->TPGRON = 0; |
| pGRRD->GRAT[0] = SBRAT[0]; |
| pGRRD->GRAT[1] = SBRAT[1]; |
| pGRRD->GRAT[2] = SBRAT[2]; |
| pGRRD->GRAT[3] = SBRAT[3]; |
| pIBI = pGRRD->Decode(pArithDecoder, grContext); |
| } |
| if (!pIBI) |
| return nullptr; |
| |
| uint32_t WI = pIBI->width(); |
| uint32_t HI = pIBI->height(); |
| 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; |
| } |
| if (!CURS.IsValid()) |
| return nullptr; |
| |
| int32_t SI = CURS.ValueOrDie(); |
| ComposeData compose = GetComposeData(SI, TI, WI, HI); |
| pIBI.Get()->ComposeTo(SBREG.get(), compose.x, compose.y, SBCOMBOP); |
| if (compose.increment) |
| CURS += compose.increment; |
| ++NINSTANCES; |
| } |
| } |
| return SBREG; |
| } |
| |
| CJBig2_TRDProc::ComposeData CJBig2_TRDProc::GetComposeData(int32_t SI, |
| int32_t TI, |
| uint32_t WI, |
| uint32_t HI) const { |
| ComposeData results; |
| if (TRANSPOSED == 0) { |
| switch (REFCORNER) { |
| case JBIG2_CORNER_TOPLEFT: |
| results.x = SI; |
| results.y = TI; |
| results.increment = WI - 1; |
| break; |
| case JBIG2_CORNER_TOPRIGHT: |
| results.x = SI - WI + 1; |
| results.y = TI; |
| break; |
| case JBIG2_CORNER_BOTTOMLEFT: |
| results.x = SI; |
| results.y = TI - HI + 1; |
| results.increment = WI - 1; |
| break; |
| case JBIG2_CORNER_BOTTOMRIGHT: |
| results.x = SI - WI + 1; |
| results.y = TI - HI + 1; |
| break; |
| } |
| } else { |
| switch (REFCORNER) { |
| case JBIG2_CORNER_TOPLEFT: |
| results.x = TI; |
| results.y = SI; |
| results.increment = HI - 1; |
| break; |
| case JBIG2_CORNER_TOPRIGHT: |
| results.x = TI - WI + 1; |
| results.y = SI; |
| results.increment = HI - 1; |
| break; |
| case JBIG2_CORNER_BOTTOMLEFT: |
| results.x = TI; |
| results.y = SI - HI + 1; |
| break; |
| case JBIG2_CORNER_BOTTOMRIGHT: |
| results.x = TI - WI + 1; |
| results.y = SI - HI + 1; |
| break; |
| } |
| } |
| return results; |
| } |
