Move CFGAS_Stream to CFX_SeekableStreamProxy

This CL moves the FGAS stream code into core/fxcrt and renames to
CFX_SeekableStreamProxy.

Change-Id: I6641fe0cca45a128ef3ec281b0b40f8d60296387
Reviewed-on: https://pdfium-review.googlesource.com/4311
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>

3 files changed, 0 insertions, 495 deletions

diff --git a/xfa/fgas/crt/cfgas_stream.cpp b/xfa/fgas/crt/cfgas_stream.cpp
deleted file mode 100644
index 809c19bdae..0000000000
--- a/xfa/fgas/crt/cfgas_stream.cpp
+++ /dev/null
@@ -1,304 +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 "xfa/fgas/crt/cfgas_stream.h"
-
-#if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN32_MOBILE_ || \
-    _FX_OS_ == _FX_WIN64_
-#include <io.h>
-#endif
-
-#include <algorithm>
-#include <limits>
-#include <memory>
-#include <utility>
-#include <vector>
-
-#include "core/fxcrt/fx_ext.h"
-#include "third_party/base/ptr_util.h"
-#include "third_party/base/stl_util.h"
-#include "xfa/fgas/crt/fgas_codepage.h"
-
-namespace {
-
-// Returns {src bytes consumed, dst bytes produced}.
-std::pair<FX_STRSIZE, FX_STRSIZE> UTF8Decode(const char* pSrc,
-                                             FX_STRSIZE srcLen,
-                                             wchar_t* pDst,
-                                             FX_STRSIZE dstLen) {
-  ASSERT(pDst && dstLen > 0);
-
-  if (srcLen < 1)
-    return {0, 0};
-
-  uint32_t dwCode = 0;
-  int32_t iPending = 0;
-  FX_STRSIZE iSrcNum = 0;
-  FX_STRSIZE iDstNum = 0;
-  FX_STRSIZE iIndex = 0;
-  int32_t k = 1;
-  while (iIndex < srcLen) {
-    uint8_t byte = static_cast<uint8_t>(*(pSrc + iIndex));
-    if (byte < 0x80) {
-      iPending = 0;
-      k = 1;
-      iDstNum++;
-      iSrcNum += k;
-      *pDst++ = byte;
-      if (iDstNum >= dstLen)
-        break;
-    } else if (byte < 0xc0) {
-      if (iPending < 1)
-        break;
-
-      iPending--;
-      dwCode |= (byte & 0x3f) << (iPending * 6);
-      if (iPending == 0) {
-        iDstNum++;
-        iSrcNum += k;
-        *pDst++ = dwCode;
-        if (iDstNum >= dstLen)
-          break;
-      }
-    } else if (byte < 0xe0) {
-      iPending = 1;
-      k = 2;
-      dwCode = (byte & 0x1f) << 6;
-    } else if (byte < 0xf0) {
-      iPending = 2;
-      k = 3;
-      dwCode = (byte & 0x0f) << 12;
-    } else if (byte < 0xf8) {
-      iPending = 3;
-      k = 4;
-      dwCode = (byte & 0x07) << 18;
-    } else if (byte < 0xfc) {
-      iPending = 4;
-      k = 5;
-      dwCode = (byte & 0x03) << 24;
-    } else if (byte < 0xfe) {
-      iPending = 5;
-      k = 6;
-      dwCode = (byte & 0x01) << 30;
-    } else {
-      break;
-    }
-    iIndex++;
-  }
-  return {iSrcNum, iDstNum};
-}
-
-void UTF16ToWChar(void* pBuffer, FX_STRSIZE iLength) {
-  ASSERT(pBuffer && iLength > 0);
-
-  if (sizeof(wchar_t) == 2)
-    return;
-
-  uint16_t* pSrc = static_cast<uint16_t*>(pBuffer);
-  wchar_t* pDst = static_cast<wchar_t*>(pBuffer);
-  while (--iLength >= 0)
-    pDst[iLength] = static_cast<wchar_t>(pSrc[iLength]);
-}
-
-void SwapByteOrder(wchar_t* pStr, FX_STRSIZE iLength) {
-  ASSERT(pStr);
-
-  if (iLength < 0)
-    iLength = FXSYS_wcslen(pStr);
-
-  uint16_t wch;
-  if (sizeof(wchar_t) > 2) {
-    while (iLength-- > 0) {
-      wch = static_cast<uint16_t>(*pStr);
-      wch = (wch >> 8) | (wch << 8);
-      wch &= 0x00FF;
-      *pStr = wch;
-      ++pStr;
-    }
-    return;
-  }
-
-  while (iLength-- > 0) {
-    wch = static_cast<uint16_t>(*pStr);
-    wch = (wch >> 8) | (wch << 8);
-    *pStr = wch;
-    ++pStr;
-  }
-}
-
-}  // namespace
-
-#if _FX_ENDIAN_ == _FX_LITTLE_ENDIAN_
-#define BOM_MASK 0x00FFFFFF
-#define BOM_UTF8 0x00BFBBEF
-#define BOM_UTF16_MASK 0x0000FFFF
-#define BOM_UTF16_BE 0x0000FFFE
-#define BOM_UTF16_LE 0x0000FEFF
-#else
-#define BOM_MASK 0xFFFFFF00
-#define BOM_UTF8 0xEFBBBF00
-#define BOM_UTF16_MASK 0xFFFF0000
-#define BOM_UTF16_BE 0xFEFF0000
-#define BOM_UTF16_LE 0xFFFE0000
-#endif  // _FX_ENDIAN_ == _FX_LITTLE_ENDIAN_
-
-CFGAS_Stream::CFGAS_Stream(const CFX_RetainPtr<IFX_SeekableStream>& stream,
-                           bool isWriteStream)
-    : m_wCodePage(FX_CODEPAGE_DefANSI),
-      m_wBOMLength(0),
-      m_IsWriteStream(isWriteStream),
-      m_iPosition(0),
-      m_pStream(stream) {
-  ASSERT(m_pStream);
-
-  if (isWriteStream) {
-    m_iPosition = m_pStream->GetSize();
-    return;
-  }
-
-  FX_FILESIZE iPosition = GetPosition();
-  Seek(CFGAS_Stream::Pos::Begin, 0);
-
-  uint32_t bom;
-  ReadData(reinterpret_cast<uint8_t*>(&bom), 3);
-
-  bom &= BOM_MASK;
-  if (bom == BOM_UTF8) {
-    m_wBOMLength = 3;
-    m_wCodePage = FX_CODEPAGE_UTF8;
-  } else {
-    bom &= BOM_UTF16_MASK;
-    if (bom == BOM_UTF16_BE) {
-      m_wBOMLength = 2;
-      m_wCodePage = FX_CODEPAGE_UTF16BE;
-    } else if (bom == BOM_UTF16_LE) {
-      m_wBOMLength = 2;
-      m_wCodePage = FX_CODEPAGE_UTF16LE;
-    } else {
-      m_wBOMLength = 0;
-      m_wCodePage = FXSYS_GetACP();
-    }
-  }
-
-  Seek(CFGAS_Stream::Pos::Begin,
-       std::max(static_cast<FX_FILESIZE>(m_wBOMLength), iPosition));
-}
-
-CFGAS_Stream::CFGAS_Stream(uint8_t* data, FX_STRSIZE size)
-    : CFGAS_Stream(IFX_MemoryStream::Create(data, size), false) {}
-
-CFGAS_Stream::~CFGAS_Stream() {}
-
-void CFGAS_Stream::Seek(CFGAS_Stream::Pos eSeek, FX_FILESIZE iOffset) {
-  switch (eSeek) {
-    case CFGAS_Stream::Pos::Begin:
-      m_iPosition = iOffset;
-      break;
-    case CFGAS_Stream::Pos::Current:
-      m_iPosition += iOffset;
-      break;
-  }
-  m_iPosition =
-      pdfium::clamp(m_iPosition, static_cast<FX_FILESIZE>(0), GetLength());
-}
-
-void CFGAS_Stream::SetCodePage(uint16_t wCodePage) {
-  if (m_wBOMLength > 0)
-    return;
-  m_wCodePage = wCodePage;
-}
-
-FX_STRSIZE CFGAS_Stream::ReadData(uint8_t* pBuffer, FX_STRSIZE iBufferSize) {
-  ASSERT(pBuffer && iBufferSize > 0);
-
-  if (m_IsWriteStream)
-    return -1;
-
-  iBufferSize = std::min(
-      iBufferSize, static_cast<FX_STRSIZE>(m_pStream->GetSize() - m_iPosition));
-  if (iBufferSize <= 0)
-    return 0;
-
-  if (m_pStream->ReadBlock(pBuffer, m_iPosition, iBufferSize)) {
-    pdfium::base::CheckedNumeric<FX_FILESIZE> new_pos = m_iPosition;
-    new_pos += iBufferSize;
-    if (!new_pos.IsValid())
-      return 0;
-
-    m_iPosition = new_pos.ValueOrDie();
-    return iBufferSize;
-  }
-  return 0;
-}
-
-FX_STRSIZE CFGAS_Stream::ReadString(wchar_t* pStr,
-                                    FX_STRSIZE iMaxLength,
-                                    bool* bEOS) {
-  ASSERT(pStr && iMaxLength > 0);
-
-  if (m_IsWriteStream)
-    return -1;
-
-  if (m_wCodePage == FX_CODEPAGE_UTF16LE ||
-      m_wCodePage == FX_CODEPAGE_UTF16BE) {
-    FX_FILESIZE iBytes = iMaxLength * 2;
-    FX_STRSIZE iLen = ReadData(reinterpret_cast<uint8_t*>(pStr), iBytes);
-    iMaxLength = iLen / 2;
-    if (sizeof(wchar_t) > 2)
-      UTF16ToWChar(pStr, iMaxLength);
-
-#if _FX_ENDIAN_ == _FX_BIG_ENDIAN_
-    if (m_wCodePage == FX_CODEPAGE_UTF16LE)
-      SwapByteOrder(pStr, iMaxLength);
-#else
-    if (m_wCodePage == FX_CODEPAGE_UTF16BE)
-      SwapByteOrder(pStr, iMaxLength);
-#endif
-
-  } else {
-    FX_FILESIZE pos = GetPosition();
-    FX_STRSIZE iBytes =
-        std::min(iMaxLength, static_cast<FX_STRSIZE>(GetLength() - pos));
-
-    if (iBytes > 0) {
-      std::vector<uint8_t> buf(iBytes);
-
-      FX_STRSIZE iLen = ReadData(buf.data(), iBytes);
-      if (m_wCodePage != FX_CODEPAGE_UTF8)
-        return -1;
-
-      FX_STRSIZE iSrc = 0;
-      std::tie(iSrc, iMaxLength) = UTF8Decode(
-          reinterpret_cast<const char*>(buf.data()), iLen, pStr, iMaxLength);
-      Seek(CFGAS_Stream::Pos::Current, iSrc - iLen);
-    } else {
-      iMaxLength = 0;
-    }
-  }
-
-  *bEOS = IsEOF();
-  return iMaxLength;
-}
-
-void CFGAS_Stream::WriteString(const CFX_WideStringC& str) {
-  if (!m_IsWriteStream || str.GetLength() == 0 ||
-      m_wCodePage != FX_CODEPAGE_UTF8) {
-    return;
-  }
-  if (!m_pStream->WriteBlock(str.c_str(), m_iPosition,
-                             str.GetLength() * sizeof(wchar_t))) {
-    return;
-  }
-
-  pdfium::base::CheckedNumeric<FX_STRSIZE> new_pos = m_iPosition;
-  new_pos += str.GetLength() * sizeof(wchar_t);
-  if (!new_pos.IsValid()) {
-    m_iPosition = std::numeric_limits<FX_STRSIZE>::max();
-    return;
-  }
-
-  m_iPosition = new_pos.ValueOrDie();
-}
diff --git a/xfa/fgas/crt/cfgas_stream.h b/xfa/fgas/crt/cfgas_stream.h
deleted file mode 100644
index 5d2e5e6242..0000000000
--- a/xfa/fgas/crt/cfgas_stream.h
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright 2017 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
-
-#ifndef XFA_FGAS_CRT_CFGAS_STREAM_H_
-#define XFA_FGAS_CRT_CFGAS_STREAM_H_
-
-#include <algorithm>
-
-#include "core/fxcrt/cfx_retain_ptr.h"
-#include "core/fxcrt/fx_stream.h"
-#include "core/fxcrt/fx_system.h"
-
-class CFGAS_Stream : public CFX_Retainable {
- public:
-  enum class Pos {
-    Begin = 0,
-    Current,
-  };
-
-  template <typename T, typename... Args>
-  friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
-
-  FX_FILESIZE GetLength() const { return m_pStream->GetSize(); }
-  FX_FILESIZE GetPosition() { return m_iPosition; }
-  FX_STRSIZE GetBOMLength() const { return std::max(0, m_wBOMLength); }
-  bool IsEOF() const { return m_iPosition >= GetLength(); }
-
-  void Seek(CFGAS_Stream::Pos eSeek, FX_FILESIZE iOffset);
-  FX_STRSIZE ReadString(wchar_t* pStr, FX_STRSIZE iMaxLength, bool* bEOS);
-
-  void WriteString(const CFX_WideStringC& str);
-
-  uint16_t GetCodePage() const { return m_wCodePage; }
-  void SetCodePage(uint16_t wCodePage);
-
- private:
-  CFGAS_Stream(const CFX_RetainPtr<IFX_SeekableStream>& stream,
-               bool isWriteSteam);
-  CFGAS_Stream(uint8_t* data, FX_STRSIZE size);
-  ~CFGAS_Stream() override;
-
-  FX_STRSIZE ReadData(uint8_t* pBuffer, FX_STRSIZE iBufferSize);
-
-  uint16_t m_wCodePage;
-  FX_STRSIZE m_wBOMLength;
-  bool m_IsWriteStream;
-  FX_FILESIZE m_iPosition;
-  CFX_RetainPtr<IFX_SeekableStream> m_pStream;
-};
-
-#endif  // XFA_FGAS_CRT_CFGAS_STREAM_H_
diff --git a/xfa/fgas/crt/fgas_codepage.h b/xfa/fgas/crt/fgas_codepage.h
deleted file mode 100644
index 17813595e6..0000000000
--- a/xfa/fgas/crt/fgas_codepage.h
+++ /dev/null
@@ -1,137 +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
-
-#ifndef XFA_FGAS_CRT_FGAS_CODEPAGE_H_
-#define XFA_FGAS_CRT_FGAS_CODEPAGE_H_
-
-#include "core/fxcrt/fx_basic.h"
-
-#define FX_CODEPAGE_DefANSI 0
-#define FX_CODEPAGE_DefOEM 1
-#define FX_CODEPAGE_DefMAC 2
-#define FX_CODEPAGE_Thread 3
-#define FX_CODEPAGE_Symbol 42
-#define FX_CODEPAGE_MSDOS_US 437
-#define FX_CODEPAGE_Arabic_ASMO708 708
-#define FX_CODEPAGE_Arabic_ASMO449Plus 709
-#define FX_CODEPAGE_Arabic_Transparent 710
-#define FX_CODEPAGE_Arabic_NafithaEnhanced 711
-#define FX_CODEPAGE_Arabic_TransparentASMO 720
-#define FX_CODEPAGE_MSDOS_Greek1 737
-#define FX_CODEPAGE_MSDOS_Baltic 775
-#define FX_CODEPAGE_MSWin31_WesternEuropean 819
-#define FX_CODEPAGE_MSDOS_WesternEuropean 850
-#define FX_CODEPAGE_MSDOS_EasternEuropean 852
-#define FX_CODEPAGE_MSDOS_Latin3 853
-#define FX_CODEPAGE_MSDOS_Cyrillic 855
-#define FX_CODEPAGE_MSDOS_Turkish 857
-#define FX_CODEPAGE_MSDOS_Latin1Euro 858
-#define FX_CODEPAGE_MSDOS_Portuguese 860
-#define FX_CODEPAGE_MSDOS_Icelandic 861
-#define FX_CODEPAGE_MSDOS_Hebrew 862
-#define FX_CODEPAGE_MSDOS_FrenchCanadian 863
-#define FX_CODEPAGE_MSDOS_Arabic 864
-#define FX_CODEPAGE_MSDOS_Norwegian 865
-#define FX_CODEPAGE_MSDOS_Russian 866
-#define FX_CODEPAGE_MSDOS_Greek2 869
-#define FX_CODEPAGE_MSDOS_Thai 874
-#define FX_CODEPAGE_MSDOS_KamenickyCS 895
-#define FX_CODEPAGE_ShiftJIS 932
-#define FX_CODEPAGE_ChineseSimplified 936
-#define FX_CODEPAGE_Korean 949
-#define FX_CODEPAGE_ChineseTraditional 950
-#define FX_CODEPAGE_UTF16LE 1200
-#define FX_CODEPAGE_UTF16BE 1201
-#define FX_CODEPAGE_MSWin_EasternEuropean 1250
-#define FX_CODEPAGE_MSWin_Cyrillic 1251
-#define FX_CODEPAGE_MSWin_WesternEuropean 1252
-#define FX_CODEPAGE_MSWin_Greek 1253
-#define FX_CODEPAGE_MSWin_Turkish 1254
-#define FX_CODEPAGE_MSWin_Hebrew 1255
-#define FX_CODEPAGE_MSWin_Arabic 1256
-#define FX_CODEPAGE_MSWin_Baltic 1257
-#define FX_CODEPAGE_MSWin_Vietnamese 1258
-#define FX_CODEPAGE_Johab 1361
-#define FX_CODEPAGE_MAC_Roman 10000
-#define FX_CODEPAGE_MAC_ShiftJIS 10001
-#define FX_CODEPAGE_MAC_ChineseTraditional 10002
-#define FX_CODEPAGE_MAC_Korean 10003
-#define FX_CODEPAGE_MAC_Arabic 10004
-#define FX_CODEPAGE_MAC_Hebrew 10005
-#define FX_CODEPAGE_MAC_Greek 10006
-#define FX_CODEPAGE_MAC_Cyrillic 10007
-#define FX_CODEPAGE_MAC_ChineseSimplified 10008
-#define FX_CODEPAGE_MAC_Thai 10021
-#define FX_CODEPAGE_MAC_EasternEuropean 10029
-#define FX_CODEPAGE_MAC_Turkish 10081
-#define FX_CODEPAGE_UTF32LE 12000
-#define FX_CODEPAGE_UTF32BE 12001
-#define FX_CODEPAGE_ISO8859_1 28591
-#define FX_CODEPAGE_ISO8859_2 28592
-#define FX_CODEPAGE_ISO8859_3 28593
-#define FX_CODEPAGE_ISO8859_4 28594
-#define FX_CODEPAGE_ISO8859_5 28595
-#define FX_CODEPAGE_ISO8859_6 28596
-#define FX_CODEPAGE_ISO8859_7 28597
-#define FX_CODEPAGE_ISO8859_8 28598
-#define FX_CODEPAGE_ISO8859_9 28599
-#define FX_CODEPAGE_ISO8859_10 28600
-#define FX_CODEPAGE_ISO8859_11 28601
-#define FX_CODEPAGE_ISO8859_12 28602
-#define FX_CODEPAGE_ISO8859_13 28603
-#define FX_CODEPAGE_ISO8859_14 28604
-#define FX_CODEPAGE_ISO8859_15 28605
-#define FX_CODEPAGE_ISO8859_16 28606
-#define FX_CODEPAGE_ISCII_Devanagari 57002
-#define FX_CODEPAGE_ISCII_Bengali 57003
-#define FX_CODEPAGE_ISCII_Tamil 57004
-#define FX_CODEPAGE_ISCII_Telugu 57005
-#define FX_CODEPAGE_ISCII_Assamese 57006
-#define FX_CODEPAGE_ISCII_Oriya 57007
-#define FX_CODEPAGE_ISCII_Kannada 57008
-#define FX_CODEPAGE_ISCII_Malayalam 57009
-#define FX_CODEPAGE_ISCII_Gujarati 57010
-#define FX_CODEPAGE_ISCII_Punjabi 57011
-#define FX_CODEPAGE_UTF7 65000
-#define FX_CODEPAGE_UTF8 65001
-
-#define FX_CHARSET_ANSI 0
-#define FX_CHARSET_Default 1
-#define FX_CHARSET_Symbol 2
-#define FX_CHARSET_MAC_Roman 77
-#define FX_CHARSET_MAC_ShiftJIS 78
-#define FX_CHARSET_MAC_Korean 79
-#define FX_CHARSET_MAC_ChineseSimplified 80
-#define FX_CHARSET_MAC_ChineseTriditional 81
-#define FX_CHARSET_MAC_Johab 82
-#define FX_CHARSET_MAC_Hebrew 83
-#define FX_CHARSET_MAC_Arabic 84
-#define FX_CHARSET_MAC_Greek 85
-#define FX_CHARSET_MAC_Turkish 86
-#define FX_CHARSET_MAC_Thai 87
-#define FX_CHARSET_MAC_EasternEuropean 88
-#define FX_CHARSET_MAC_Cyrillic 89
-#define FX_CHARSET_ShiftJIS 128
-#define FX_CHARSET_Korean 129
-#define FX_CHARSET_Johab 130
-#define FX_CHARSET_ChineseSimplified 134
-#define FX_CHARSET_ChineseTriditional 136
-#define FX_CHARSET_MSWin_Greek 161
-#define FX_CHARSET_MSWin_Turkish 162
-#define FX_CHARSET_MSWin_Vietnamese 163
-#define FX_CHARSET_MSWin_Hebrew 177
-#define FX_CHARSET_MSWin_Arabic 178
-#define FX_CHARSET_ArabicTraditional 179
-#define FX_CHARSET_ArabicUser 180
-#define FX_CHARSET_HebrewUser 181
-#define FX_CHARSET_MSWin_Baltic 186
-#define FX_CHARSET_MSWin_Cyrillic 204
-#define FX_CHARSET_Thai 222
-#define FX_CHARSET_MSWin_EasterEuropean 238
-#define FX_CHARSET_US 254
-#define FX_CHARSET_OEM 255
-
-#endif  // XFA_FGAS_CRT_FGAS_CODEPAGE_H_