From 5acacd361b15b82a8b30cdd5cb92abb8a2104ecf Mon Sep 17 00:00:00 2001
From: Dan Sinclair <dsinclair@chromium.org>
Date: Thu, 25 May 2017 14:04:59 -0400
Subject: Break apart the pageint.h file.

This CL separates pageint.h and the supporting cpp files into indivudal
class files.

Change-Id: Idcadce41976a8cd5f0d916e6a5ebbc283fd36527
Reviewed-on: https://pdfium-review.googlesource.com/5930
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
---
 core/fpdfapi/page/fpdf_page_func.cpp | 851 -----------------------------------
 1 file changed, 851 deletions(-)
 delete mode 100644 core/fpdfapi/page/fpdf_page_func.cpp

(limited to 'core/fpdfapi/page/fpdf_page_func.cpp')

diff --git a/core/fpdfapi/page/fpdf_page_func.cpp b/core/fpdfapi/page/fpdf_page_func.cpp
deleted file mode 100644
index 48cd41c090..0000000000
--- a/core/fpdfapi/page/fpdf_page_func.cpp
+++ /dev/null
@@ -1,851 +0,0 @@
-// 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
-
-#include "core/fpdfapi/page/pageint.h"
-
-#include <limits.h>
-
-#include <algorithm>
-#include <memory>
-#include <utility>
-#include <vector>
-
-#include "core/fpdfapi/page/cpdf_psengine.h"
-#include "core/fpdfapi/parser/cpdf_array.h"
-#include "core/fpdfapi/parser/cpdf_dictionary.h"
-#include "core/fpdfapi/parser/cpdf_simple_parser.h"
-#include "core/fpdfapi/parser/cpdf_stream.h"
-#include "core/fpdfapi/parser/cpdf_stream_acc.h"
-#include "core/fxcrt/fx_safe_types.h"
-#include "third_party/base/logging.h"
-#include "third_party/base/ptr_util.h"
-#include "third_party/base/stl_util.h"
-
-namespace {
-
-struct PDF_PSOpName {
-  const char* name;
-  PDF_PSOP op;
-};
-
-const PDF_PSOpName kPsOpNames[] = {
-    {"add", PSOP_ADD},         {"sub", PSOP_SUB},
-    {"mul", PSOP_MUL},         {"div", PSOP_DIV},
-    {"idiv", PSOP_IDIV},       {"mod", PSOP_MOD},
-    {"neg", PSOP_NEG},         {"abs", PSOP_ABS},
-    {"ceiling", PSOP_CEILING}, {"floor", PSOP_FLOOR},
-    {"round", PSOP_ROUND},     {"truncate", PSOP_TRUNCATE},
-    {"sqrt", PSOP_SQRT},       {"sin", PSOP_SIN},
-    {"cos", PSOP_COS},         {"atan", PSOP_ATAN},
-    {"exp", PSOP_EXP},         {"ln", PSOP_LN},
-    {"log", PSOP_LOG},         {"cvi", PSOP_CVI},
-    {"cvr", PSOP_CVR},         {"eq", PSOP_EQ},
-    {"ne", PSOP_NE},           {"gt", PSOP_GT},
-    {"ge", PSOP_GE},           {"lt", PSOP_LT},
-    {"le", PSOP_LE},           {"and", PSOP_AND},
-    {"or", PSOP_OR},           {"xor", PSOP_XOR},
-    {"not", PSOP_NOT},         {"bitshift", PSOP_BITSHIFT},
-    {"true", PSOP_TRUE},       {"false", PSOP_FALSE},
-    {"if", PSOP_IF},           {"ifelse", PSOP_IFELSE},
-    {"pop", PSOP_POP},         {"exch", PSOP_EXCH},
-    {"dup", PSOP_DUP},         {"copy", PSOP_COPY},
-    {"index", PSOP_INDEX},     {"roll", PSOP_ROLL}};
-
-// See PDF Reference 1.7, page 170, table 3.36.
-bool IsValidBitsPerSample(uint32_t x) {
-  switch (x) {
-    case 1:
-    case 2:
-    case 4:
-    case 8:
-    case 12:
-    case 16:
-    case 24:
-    case 32:
-      return true;
-    default:
-      return false;
-  }
-}
-
-// See PDF Reference 1.7, page 170.
-float PDF_Interpolate(float x, float xmin, float xmax, float ymin, float ymax) {
-  float divisor = xmax - xmin;
-  return ymin + (divisor ? (x - xmin) * (ymax - ymin) / divisor : 0);
-}
-
-class CPDF_PSFunc : public CPDF_Function {
- public:
-  CPDF_PSFunc() : CPDF_Function(Type::kType4PostScript) {}
-  ~CPDF_PSFunc() override {}
-
-  // CPDF_Function
-  bool v_Init(CPDF_Object* pObj) override;
-  bool v_Call(float* inputs, float* results) const override;
-
- private:
-  CPDF_PSEngine m_PS;
-};
-
-bool CPDF_PSFunc::v_Init(CPDF_Object* pObj) {
-  auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pObj->AsStream());
-  pAcc->LoadAllData(false);
-  return m_PS.Parse(reinterpret_cast<const char*>(pAcc->GetData()),
-                    pAcc->GetSize());
-}
-
-bool CPDF_PSFunc::v_Call(float* inputs, float* results) const {
-  CPDF_PSEngine& PS = const_cast<CPDF_PSEngine&>(m_PS);
-  PS.Reset();
-  for (uint32_t i = 0; i < m_nInputs; i++)
-    PS.Push(inputs[i]);
-  PS.Execute();
-  if (PS.GetStackSize() < m_nOutputs)
-    return false;
-  for (uint32_t i = 0; i < m_nOutputs; i++)
-    results[m_nOutputs - i - 1] = PS.Pop();
-  return true;
-}
-
-}  // namespace
-
-class CPDF_PSOP {
- public:
-  explicit CPDF_PSOP(PDF_PSOP op) : m_op(op), m_value(0) {
-    ASSERT(m_op != PSOP_CONST);
-    ASSERT(m_op != PSOP_PROC);
-  }
-  explicit CPDF_PSOP(float value) : m_op(PSOP_CONST), m_value(value) {}
-  CPDF_PSOP()
-      : m_op(PSOP_PROC),
-        m_value(0),
-        m_proc(pdfium::MakeUnique<CPDF_PSProc>()) {}
-
-  float GetFloatValue() const {
-    if (m_op == PSOP_CONST)
-      return m_value;
-
-    NOTREACHED();
-    return 0;
-  }
-  CPDF_PSProc* GetProc() const {
-    if (m_op == PSOP_PROC)
-      return m_proc.get();
-    NOTREACHED();
-    return nullptr;
-  }
-
-  PDF_PSOP GetOp() const { return m_op; }
-
- private:
-  const PDF_PSOP m_op;
-  const float m_value;
-  std::unique_ptr<CPDF_PSProc> m_proc;
-};
-
-bool CPDF_PSEngine::Execute() {
-  return m_MainProc.Execute(this);
-}
-
-CPDF_PSProc::CPDF_PSProc() {}
-CPDF_PSProc::~CPDF_PSProc() {}
-
-bool CPDF_PSProc::Execute(CPDF_PSEngine* pEngine) {
-  for (size_t i = 0; i < m_Operators.size(); ++i) {
-    const PDF_PSOP op = m_Operators[i]->GetOp();
-    if (op == PSOP_PROC)
-      continue;
-
-    if (op == PSOP_CONST) {
-      pEngine->Push(m_Operators[i]->GetFloatValue());
-      continue;
-    }
-
-    if (op == PSOP_IF) {
-      if (i == 0 || m_Operators[i - 1]->GetOp() != PSOP_PROC)
-        return false;
-
-      if (static_cast<int>(pEngine->Pop()))
-        m_Operators[i - 1]->GetProc()->Execute(pEngine);
-    } else if (op == PSOP_IFELSE) {
-      if (i < 2 || m_Operators[i - 1]->GetOp() != PSOP_PROC ||
-          m_Operators[i - 2]->GetOp() != PSOP_PROC) {
-        return false;
-      }
-      size_t offset = static_cast<int>(pEngine->Pop()) ? 2 : 1;
-      m_Operators[i - offset]->GetProc()->Execute(pEngine);
-    } else {
-      pEngine->DoOperator(op);
-    }
-  }
-  return true;
-}
-
-CPDF_PSEngine::CPDF_PSEngine() : m_StackCount(0) {}
-
-CPDF_PSEngine::~CPDF_PSEngine() {}
-
-void CPDF_PSEngine::Push(float v) {
-  if (m_StackCount < PSENGINE_STACKSIZE)
-    m_Stack[m_StackCount++] = v;
-}
-
-float CPDF_PSEngine::Pop() {
-  return m_StackCount > 0 ? m_Stack[--m_StackCount] : 0;
-}
-
-bool CPDF_PSEngine::Parse(const char* str, int size) {
-  CPDF_SimpleParser parser(reinterpret_cast<const uint8_t*>(str), size);
-  CFX_ByteStringC word = parser.GetWord();
-  return word == "{" ? m_MainProc.Parse(&parser, 0) : false;
-}
-
-bool CPDF_PSProc::Parse(CPDF_SimpleParser* parser, int depth) {
-  if (depth > kMaxDepth)
-    return false;
-
-  while (1) {
-    CFX_ByteStringC word = parser->GetWord();
-    if (word.IsEmpty())
-      return false;
-
-    if (word == "}")
-      return true;
-
-    if (word == "{") {
-      m_Operators.push_back(pdfium::MakeUnique<CPDF_PSOP>());
-      if (!m_Operators.back()->GetProc()->Parse(parser, depth + 1))
-        return false;
-      continue;
-    }
-
-    std::unique_ptr<CPDF_PSOP> op;
-    for (const PDF_PSOpName& op_name : kPsOpNames) {
-      if (word == CFX_ByteStringC(op_name.name)) {
-        op = pdfium::MakeUnique<CPDF_PSOP>(op_name.op);
-        break;
-      }
-    }
-    if (!op)
-      op = pdfium::MakeUnique<CPDF_PSOP>(FX_atof(word));
-    m_Operators.push_back(std::move(op));
-  }
-}
-
-bool CPDF_PSEngine::DoOperator(PDF_PSOP op) {
-  int i1;
-  int i2;
-  float d1;
-  float d2;
-  FX_SAFE_INT32 result;
-  switch (op) {
-    case PSOP_ADD:
-      d1 = Pop();
-      d2 = Pop();
-      Push(d1 + d2);
-      break;
-    case PSOP_SUB:
-      d2 = Pop();
-      d1 = Pop();
-      Push(d1 - d2);
-      break;
-    case PSOP_MUL:
-      d1 = Pop();
-      d2 = Pop();
-      Push(d1 * d2);
-      break;
-    case PSOP_DIV:
-      d2 = Pop();
-      d1 = Pop();
-      Push(d1 / d2);
-      break;
-    case PSOP_IDIV:
-      i2 = static_cast<int>(Pop());
-      i1 = static_cast<int>(Pop());
-      if (i2) {
-        result = i1;
-        result /= i2;
-        Push(result.ValueOrDefault(0));
-      } else {
-        Push(0);
-      }
-      break;
-    case PSOP_MOD:
-      i2 = static_cast<int>(Pop());
-      i1 = static_cast<int>(Pop());
-      if (i2) {
-        result = i1;
-        result %= i2;
-        Push(result.ValueOrDefault(0));
-      } else {
-        Push(0);
-      }
-      break;
-    case PSOP_NEG:
-      d1 = Pop();
-      Push(-d1);
-      break;
-    case PSOP_ABS:
-      d1 = Pop();
-      Push((float)fabs(d1));
-      break;
-    case PSOP_CEILING:
-      d1 = Pop();
-      Push((float)ceil(d1));
-      break;
-    case PSOP_FLOOR:
-      d1 = Pop();
-      Push((float)floor(d1));
-      break;
-    case PSOP_ROUND:
-      d1 = Pop();
-      Push(FXSYS_round(d1));
-      break;
-    case PSOP_TRUNCATE:
-      i1 = (int)Pop();
-      Push(i1);
-      break;
-    case PSOP_SQRT:
-      d1 = Pop();
-      Push((float)sqrt(d1));
-      break;
-    case PSOP_SIN:
-      d1 = Pop();
-      Push((float)sin(d1 * FX_PI / 180.0f));
-      break;
-    case PSOP_COS:
-      d1 = Pop();
-      Push((float)cos(d1 * FX_PI / 180.0f));
-      break;
-    case PSOP_ATAN:
-      d2 = Pop();
-      d1 = Pop();
-      d1 = (float)(atan2(d1, d2) * 180.0 / FX_PI);
-      if (d1 < 0) {
-        d1 += 360;
-      }
-      Push(d1);
-      break;
-    case PSOP_EXP:
-      d2 = Pop();
-      d1 = Pop();
-      Push((float)FXSYS_pow(d1, d2));
-      break;
-    case PSOP_LN:
-      d1 = Pop();
-      Push((float)log(d1));
-      break;
-    case PSOP_LOG:
-      d1 = Pop();
-      Push((float)log10(d1));
-      break;
-    case PSOP_CVI:
-      i1 = (int)Pop();
-      Push(i1);
-      break;
-    case PSOP_CVR:
-      break;
-    case PSOP_EQ:
-      d2 = Pop();
-      d1 = Pop();
-      Push((int)(d1 == d2));
-      break;
-    case PSOP_NE:
-      d2 = Pop();
-      d1 = Pop();
-      Push((int)(d1 != d2));
-      break;
-    case PSOP_GT:
-      d2 = Pop();
-      d1 = Pop();
-      Push((int)(d1 > d2));
-      break;
-    case PSOP_GE:
-      d2 = Pop();
-      d1 = Pop();
-      Push((int)(d1 >= d2));
-      break;
-    case PSOP_LT:
-      d2 = Pop();
-      d1 = Pop();
-      Push((int)(d1 < d2));
-      break;
-    case PSOP_LE:
-      d2 = Pop();
-      d1 = Pop();
-      Push((int)(d1 <= d2));
-      break;
-    case PSOP_AND:
-      i1 = (int)Pop();
-      i2 = (int)Pop();
-      Push(i1 & i2);
-      break;
-    case PSOP_OR:
-      i1 = (int)Pop();
-      i2 = (int)Pop();
-      Push(i1 | i2);
-      break;
-    case PSOP_XOR:
-      i1 = (int)Pop();
-      i2 = (int)Pop();
-      Push(i1 ^ i2);
-      break;
-    case PSOP_NOT:
-      i1 = (int)Pop();
-      Push((int)!i1);
-      break;
-    case PSOP_BITSHIFT: {
-      int shift = (int)Pop();
-      result = (int)Pop();
-      if (shift > 0) {
-        result <<= shift;
-      } else {
-        // Avoids unsafe negation of INT_MIN.
-        FX_SAFE_INT32 safe_shift = shift;
-        result >>= (-safe_shift).ValueOrDefault(0);
-      }
-      Push(result.ValueOrDefault(0));
-      break;
-    }
-    case PSOP_TRUE:
-      Push(1);
-      break;
-    case PSOP_FALSE:
-      Push(0);
-      break;
-    case PSOP_POP:
-      Pop();
-      break;
-    case PSOP_EXCH:
-      d2 = Pop();
-      d1 = Pop();
-      Push(d2);
-      Push(d1);
-      break;
-    case PSOP_DUP:
-      d1 = Pop();
-      Push(d1);
-      Push(d1);
-      break;
-    case PSOP_COPY: {
-      int n = static_cast<int>(Pop());
-      if (n < 0 || m_StackCount + n > PSENGINE_STACKSIZE ||
-          n > static_cast<int>(m_StackCount))
-        break;
-      for (int i = 0; i < n; i++)
-        m_Stack[m_StackCount + i] = m_Stack[m_StackCount + i - n];
-      m_StackCount += n;
-      break;
-    }
-    case PSOP_INDEX: {
-      int n = static_cast<int>(Pop());
-      if (n < 0 || n >= static_cast<int>(m_StackCount))
-        break;
-      Push(m_Stack[m_StackCount - n - 1]);
-      break;
-    }
-    case PSOP_ROLL: {
-      int j = static_cast<int>(Pop());
-      int n = static_cast<int>(Pop());
-      if (j == 0 || n == 0 || m_StackCount == 0)
-        break;
-      if (n < 0 || n > static_cast<int>(m_StackCount))
-        break;
-
-      j %= n;
-      if (j > 0)
-        j -= n;
-      auto* begin_it = std::begin(m_Stack) + m_StackCount - n;
-      auto* middle_it = begin_it - j;
-      auto* end_it = std::begin(m_Stack) + m_StackCount;
-      std::rotate(begin_it, middle_it, end_it);
-      break;
-    }
-    default:
-      break;
-  }
-  return true;
-}
-
-CPDF_SampledFunc::CPDF_SampledFunc() : CPDF_Function(Type::kType0Sampled) {}
-
-CPDF_SampledFunc::~CPDF_SampledFunc() {}
-
-bool CPDF_SampledFunc::v_Init(CPDF_Object* pObj) {
-  CPDF_Stream* pStream = pObj->AsStream();
-  if (!pStream)
-    return false;
-
-  CPDF_Dictionary* pDict = pStream->GetDict();
-  CPDF_Array* pSize = pDict->GetArrayFor("Size");
-  CPDF_Array* pEncode = pDict->GetArrayFor("Encode");
-  CPDF_Array* pDecode = pDict->GetArrayFor("Decode");
-  m_nBitsPerSample = pDict->GetIntegerFor("BitsPerSample");
-  if (!IsValidBitsPerSample(m_nBitsPerSample))
-    return false;
-
-  m_SampleMax = 0xffffffff >> (32 - m_nBitsPerSample);
-  m_pSampleStream = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
-  m_pSampleStream->LoadAllData(false);
-  FX_SAFE_UINT32 nTotalSampleBits = 1;
-  m_EncodeInfo.resize(m_nInputs);
-  for (uint32_t i = 0; i < m_nInputs; i++) {
-    m_EncodeInfo[i].sizes = pSize ? pSize->GetIntegerAt(i) : 0;
-    if (!pSize && i == 0)
-      m_EncodeInfo[i].sizes = pDict->GetIntegerFor("Size");
-    nTotalSampleBits *= m_EncodeInfo[i].sizes;
-    if (pEncode) {
-      m_EncodeInfo[i].encode_min = pEncode->GetFloatAt(i * 2);
-      m_EncodeInfo[i].encode_max = pEncode->GetFloatAt(i * 2 + 1);
-    } else {
-      m_EncodeInfo[i].encode_min = 0;
-      m_EncodeInfo[i].encode_max =
-          m_EncodeInfo[i].sizes == 1 ? 1 : (float)m_EncodeInfo[i].sizes - 1;
-    }
-  }
-  nTotalSampleBits *= m_nBitsPerSample;
-  nTotalSampleBits *= m_nOutputs;
-  FX_SAFE_UINT32 nTotalSampleBytes = nTotalSampleBits;
-  nTotalSampleBytes += 7;
-  nTotalSampleBytes /= 8;
-  if (!nTotalSampleBytes.IsValid() || nTotalSampleBytes.ValueOrDie() == 0 ||
-      nTotalSampleBytes.ValueOrDie() > m_pSampleStream->GetSize()) {
-    return false;
-  }
-  m_DecodeInfo.resize(m_nOutputs);
-  for (uint32_t i = 0; i < m_nOutputs; i++) {
-    if (pDecode) {
-      m_DecodeInfo[i].decode_min = pDecode->GetFloatAt(2 * i);
-      m_DecodeInfo[i].decode_max = pDecode->GetFloatAt(2 * i + 1);
-    } else {
-      m_DecodeInfo[i].decode_min = m_pRanges[i * 2];
-      m_DecodeInfo[i].decode_max = m_pRanges[i * 2 + 1];
-    }
-  }
-  return true;
-}
-
-bool CPDF_SampledFunc::v_Call(float* inputs, float* results) const {
-  int pos = 0;
-  CFX_FixedBufGrow<float, 16> encoded_input_buf(m_nInputs);
-  float* encoded_input = encoded_input_buf;
-  CFX_FixedBufGrow<uint32_t, 32> int_buf(m_nInputs * 2);
-  uint32_t* index = int_buf;
-  uint32_t* blocksize = index + m_nInputs;
-  for (uint32_t i = 0; i < m_nInputs; i++) {
-    if (i == 0)
-      blocksize[i] = 1;
-    else
-      blocksize[i] = blocksize[i - 1] * m_EncodeInfo[i - 1].sizes;
-    encoded_input[i] =
-        PDF_Interpolate(inputs[i], m_pDomains[i * 2], m_pDomains[i * 2 + 1],
-                        m_EncodeInfo[i].encode_min, m_EncodeInfo[i].encode_max);
-    index[i] = pdfium::clamp(static_cast<uint32_t>(encoded_input[i]), 0U,
-                             m_EncodeInfo[i].sizes - 1);
-    pos += index[i] * blocksize[i];
-  }
-  FX_SAFE_INT32 bits_to_output = m_nOutputs;
-  bits_to_output *= m_nBitsPerSample;
-  if (!bits_to_output.IsValid())
-    return false;
-
-  FX_SAFE_INT32 bitpos = pos;
-  bitpos *= bits_to_output.ValueOrDie();
-  if (!bitpos.IsValid())
-    return false;
-
-  FX_SAFE_INT32 range_check = bitpos;
-  range_check += bits_to_output.ValueOrDie();
-  if (!range_check.IsValid())
-    return false;
-
-  const uint8_t* pSampleData = m_pSampleStream->GetData();
-  if (!pSampleData)
-    return false;
-
-  for (uint32_t j = 0; j < m_nOutputs; j++, bitpos += m_nBitsPerSample) {
-    uint32_t sample =
-        GetBits32(pSampleData, bitpos.ValueOrDie(), m_nBitsPerSample);
-    float encoded = (float)sample;
-    for (uint32_t i = 0; i < m_nInputs; i++) {
-      if (index[i] == m_EncodeInfo[i].sizes - 1) {
-        if (index[i] == 0)
-          encoded = encoded_input[i] * (float)sample;
-      } else {
-        FX_SAFE_INT32 bitpos2 = blocksize[i];
-        bitpos2 += pos;
-        bitpos2 *= m_nOutputs;
-        bitpos2 += j;
-        bitpos2 *= m_nBitsPerSample;
-        if (!bitpos2.IsValid())
-          return false;
-        uint32_t sample1 =
-            GetBits32(pSampleData, bitpos2.ValueOrDie(), m_nBitsPerSample);
-        encoded +=
-            (encoded_input[i] - index[i]) * ((float)sample1 - (float)sample);
-      }
-    }
-    results[j] =
-        PDF_Interpolate(encoded, 0, (float)m_SampleMax,
-                        m_DecodeInfo[j].decode_min, m_DecodeInfo[j].decode_max);
-  }
-  return true;
-}
-
-CPDF_ExpIntFunc::CPDF_ExpIntFunc()
-    : CPDF_Function(Type::kType2ExpotentialInterpolation),
-      m_pBeginValues(nullptr),
-      m_pEndValues(nullptr) {}
-
-CPDF_ExpIntFunc::~CPDF_ExpIntFunc() {
-  FX_Free(m_pBeginValues);
-  FX_Free(m_pEndValues);
-}
-
-bool CPDF_ExpIntFunc::v_Init(CPDF_Object* pObj) {
-  CPDF_Dictionary* pDict = pObj->GetDict();
-  if (!pDict)
-    return false;
-
-  CPDF_Array* pArray0 = pDict->GetArrayFor("C0");
-  if (m_nOutputs == 0) {
-    m_nOutputs = 1;
-    if (pArray0)
-      m_nOutputs = pArray0->GetCount();
-  }
-
-  CPDF_Array* pArray1 = pDict->GetArrayFor("C1");
-  m_pBeginValues = FX_Alloc2D(float, m_nOutputs, 2);
-  m_pEndValues = FX_Alloc2D(float, m_nOutputs, 2);
-  for (uint32_t i = 0; i < m_nOutputs; i++) {
-    m_pBeginValues[i] = pArray0 ? pArray0->GetFloatAt(i) : 0.0f;
-    m_pEndValues[i] = pArray1 ? pArray1->GetFloatAt(i) : 1.0f;
-  }
-
-  m_Exponent = pDict->GetFloatFor("N");
-  m_nOrigOutputs = m_nOutputs;
-  if (m_nOutputs && m_nInputs > INT_MAX / m_nOutputs)
-    return false;
-
-  m_nOutputs *= m_nInputs;
-  return true;
-}
-
-bool CPDF_ExpIntFunc::v_Call(float* inputs, float* results) const {
-  for (uint32_t i = 0; i < m_nInputs; i++)
-    for (uint32_t j = 0; j < m_nOrigOutputs; j++) {
-      results[i * m_nOrigOutputs + j] =
-          m_pBeginValues[j] +
-          FXSYS_pow(inputs[i], m_Exponent) *
-              (m_pEndValues[j] - m_pBeginValues[j]);
-    }
-  return true;
-}
-
-CPDF_StitchFunc::CPDF_StitchFunc()
-    : CPDF_Function(Type::kType3Stitching),
-      m_pBounds(nullptr),
-      m_pEncode(nullptr) {}
-
-CPDF_StitchFunc::~CPDF_StitchFunc() {
-  FX_Free(m_pBounds);
-  FX_Free(m_pEncode);
-}
-
-bool CPDF_StitchFunc::v_Init(CPDF_Object* pObj) {
-  CPDF_Dictionary* pDict = pObj->GetDict();
-  if (!pDict) {
-    return false;
-  }
-  if (m_nInputs != kRequiredNumInputs) {
-    return false;
-  }
-  CPDF_Array* pArray = pDict->GetArrayFor("Functions");
-  if (!pArray) {
-    return false;
-  }
-  uint32_t nSubs = pArray->GetCount();
-  if (nSubs == 0)
-    return false;
-  m_nOutputs = 0;
-  for (uint32_t i = 0; i < nSubs; i++) {
-    CPDF_Object* pSub = pArray->GetDirectObjectAt(i);
-    if (pSub == pObj)
-      return false;
-    std::unique_ptr<CPDF_Function> pFunc(CPDF_Function::Load(pSub));
-    if (!pFunc)
-      return false;
-    // Check that the input dimensionality is 1, and that all output
-    // dimensionalities are the same.
-    if (pFunc->CountInputs() != kRequiredNumInputs)
-      return false;
-    if (pFunc->CountOutputs() != m_nOutputs) {
-      if (m_nOutputs)
-        return false;
-
-      m_nOutputs = pFunc->CountOutputs();
-    }
-
-    m_pSubFunctions.push_back(std::move(pFunc));
-  }
-  m_pBounds = FX_Alloc(float, nSubs + 1);
-  m_pBounds[0] = m_pDomains[0];
-  pArray = pDict->GetArrayFor("Bounds");
-  if (!pArray)
-    return false;
-  for (uint32_t i = 0; i < nSubs - 1; i++)
-    m_pBounds[i + 1] = pArray->GetFloatAt(i);
-  m_pBounds[nSubs] = m_pDomains[1];
-  m_pEncode = FX_Alloc2D(float, nSubs, 2);
-  pArray = pDict->GetArrayFor("Encode");
-  if (!pArray)
-    return false;
-
-  for (uint32_t i = 0; i < nSubs * 2; i++)
-    m_pEncode[i] = pArray->GetFloatAt(i);
-  return true;
-}
-
-bool CPDF_StitchFunc::v_Call(float* inputs, float* outputs) const {
-  float input = inputs[0];
-  size_t i;
-  for (i = 0; i < m_pSubFunctions.size() - 1; i++) {
-    if (input < m_pBounds[i + 1])
-      break;
-  }
-  input = PDF_Interpolate(input, m_pBounds[i], m_pBounds[i + 1],
-                          m_pEncode[i * 2], m_pEncode[i * 2 + 1]);
-  int nresults;
-  m_pSubFunctions[i]->Call(&input, kRequiredNumInputs, outputs, &nresults);
-  return true;
-}
-
-// static
-std::unique_ptr<CPDF_Function> CPDF_Function::Load(CPDF_Object* pFuncObj) {
-  std::unique_ptr<CPDF_Function> pFunc;
-  if (!pFuncObj)
-    return pFunc;
-
-  int iType = -1;
-  if (CPDF_Stream* pStream = pFuncObj->AsStream())
-    iType = pStream->GetDict()->GetIntegerFor("FunctionType");
-  else if (CPDF_Dictionary* pDict = pFuncObj->AsDictionary())
-    iType = pDict->GetIntegerFor("FunctionType");
-
-  Type type = IntegerToFunctionType(iType);
-  if (type == Type::kType0Sampled)
-    pFunc = pdfium::MakeUnique<CPDF_SampledFunc>();
-  else if (type == Type::kType2ExpotentialInterpolation)
-    pFunc = pdfium::MakeUnique<CPDF_ExpIntFunc>();
-  else if (type == Type::kType3Stitching)
-    pFunc = pdfium::MakeUnique<CPDF_StitchFunc>();
-  else if (type == Type::kType4PostScript)
-    pFunc = pdfium::MakeUnique<CPDF_PSFunc>();
-
-  if (!pFunc || !pFunc->Init(pFuncObj))
-    return nullptr;
-
-  return pFunc;
-}
-
-// static
-CPDF_Function::Type CPDF_Function::IntegerToFunctionType(int iType) {
-  switch (iType) {
-    case 0:
-    case 2:
-    case 3:
-    case 4:
-      return static_cast<Type>(iType);
-    default:
-      return Type::kTypeInvalid;
-  }
-}
-
-CPDF_Function::CPDF_Function(Type type)
-    : m_pDomains(nullptr), m_pRanges(nullptr), m_Type(type) {}
-
-CPDF_Function::~CPDF_Function() {
-  FX_Free(m_pDomains);
-  FX_Free(m_pRanges);
-}
-
-bool CPDF_Function::Init(CPDF_Object* pObj) {
-  CPDF_Stream* pStream = pObj->AsStream();
-  CPDF_Dictionary* pDict = pStream ? pStream->GetDict() : pObj->AsDictionary();
-
-  CPDF_Array* pDomains = pDict->GetArrayFor("Domain");
-  if (!pDomains)
-    return false;
-
-  m_nInputs = pDomains->GetCount() / 2;
-  if (m_nInputs == 0)
-    return false;
-
-  m_pDomains = FX_Alloc2D(float, m_nInputs, 2);
-  for (uint32_t i = 0; i < m_nInputs * 2; i++) {
-    m_pDomains[i] = pDomains->GetFloatAt(i);
-  }
-  CPDF_Array* pRanges = pDict->GetArrayFor("Range");
-  m_nOutputs = 0;
-  if (pRanges) {
-    m_nOutputs = pRanges->GetCount() / 2;
-    m_pRanges = FX_Alloc2D(float, m_nOutputs, 2);
-    for (uint32_t i = 0; i < m_nOutputs * 2; i++)
-      m_pRanges[i] = pRanges->GetFloatAt(i);
-  }
-  uint32_t old_outputs = m_nOutputs;
-  if (!v_Init(pObj))
-    return false;
-  if (m_pRanges && m_nOutputs > old_outputs) {
-    m_pRanges = FX_Realloc(float, m_pRanges, m_nOutputs * 2);
-    if (m_pRanges) {
-      memset(m_pRanges + (old_outputs * 2), 0,
-             sizeof(float) * (m_nOutputs - old_outputs) * 2);
-    }
-  }
-  return true;
-}
-
-bool CPDF_Function::Call(float* inputs,
-                         uint32_t ninputs,
-                         float* results,
-                         int* nresults) const {
-  if (m_nInputs != ninputs)
-    return false;
-
-  *nresults = m_nOutputs;
-  for (uint32_t i = 0; i < m_nInputs; i++) {
-    inputs[i] =
-        pdfium::clamp(inputs[i], m_pDomains[i * 2], m_pDomains[i * 2 + 1]);
-  }
-  v_Call(inputs, results);
-  if (!m_pRanges)
-    return true;
-
-  for (uint32_t i = 0; i < m_nOutputs; i++) {
-    results[i] =
-        pdfium::clamp(results[i], m_pRanges[i * 2], m_pRanges[i * 2 + 1]);
-  }
-  return true;
-}
-
-const CPDF_SampledFunc* CPDF_Function::ToSampledFunc() const {
-  return m_Type == Type::kType0Sampled
-             ? static_cast<const CPDF_SampledFunc*>(this)
-             : nullptr;
-}
-
-const CPDF_ExpIntFunc* CPDF_Function::ToExpIntFunc() const {
-  return m_Type == Type::kType2ExpotentialInterpolation
-             ? static_cast<const CPDF_ExpIntFunc*>(this)
-             : nullptr;
-}
-
-const CPDF_StitchFunc* CPDF_Function::ToStitchFunc() const {
-  return m_Type == Type::kType3Stitching
-             ? static_cast<const CPDF_StitchFunc*>(this)
-             : nullptr;
-}
-- 
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