Remove the unused IFX_StreamRead::SetRange() mechanism.

core/src/fxcrt/extension.h

 // 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 CORE_SRC_FXCRT_EXTENSION_H_
 #define CORE_SRC_FXCRT_EXTENSION_H_
 
 #include "../../include/fxcrt/fx_basic.h"
@@ skipping 16 matching lines @@
                           size_t szBuffer,
                           FX_FILESIZE pos) = 0;
   virtual FX_BOOL Flush() = 0;
   virtual FX_BOOL Truncate(FX_FILESIZE szFile) = 0;
 };
 IFXCRT_FileAccess* FXCRT_FileAccess_Create();
 class CFX_CRTFileStream final : public IFX_FileStream {
  public:
   CFX_CRTFileStream(IFXCRT_FileAccess* pFA)
       : m_pFile(pFA),
-        m_dwCount(1),
-        m_bUseRange(FALSE),
-        m_nOffset(0),
-        m_nSize(0) {}
+        m_dwCount(1) {
+  }
   ~CFX_CRTFileStream() {
     if (m_pFile) {
       m_pFile->Release();
     }
   }
   virtual IFX_FileStream* Retain() override {
     m_dwCount++;
     return this;
   }
   virtual void Release() override {
     FX_DWORD nCount = --m_dwCount;
     if (!nCount) {
       delete this;
     }
   }
   virtual FX_FILESIZE GetSize() override {
-    return m_bUseRange ? m_nSize : m_pFile->GetSize();
+    return m_pFile->GetSize();
   }
   virtual FX_BOOL IsEOF() override { return GetPosition() >= GetSize(); }
   virtual FX_FILESIZE GetPosition() override {
-    FX_FILESIZE pos = m_pFile->GetPosition();
-    if (m_bUseRange) {
-      pos -= m_nOffset;
-    }
-    return pos;
+    return m_pFile->GetPosition();
   }
-  virtual FX_BOOL SetRange(FX_FILESIZE offset, FX_FILESIZE size) override {
-    if (offset < 0 || size < 0) {
-      return FALSE;
-    }
-
-    FX_SAFE_FILESIZE pos = size;
-    pos += offset;
-
-    if (!pos.IsValid() || pos.ValueOrDie() > m_pFile->GetSize()) {
-      return FALSE;
-    }
-
-    m_nOffset = offset, m_nSize = size;
-    m_bUseRange = TRUE;
-    m_pFile->SetPosition(m_nOffset);
-    return TRUE;
-  }
-  virtual void ClearRange() override { m_bUseRange = FALSE; }
   virtual FX_BOOL ReadBlock(void* buffer,
                             FX_FILESIZE offset,
                             size_t size) override {
-    if (m_bUseRange && offset < 0) {
-      return FALSE;
-    }
-    FX_SAFE_FILESIZE pos = offset;
-
-    if (m_bUseRange) {
-      pos += m_nOffset;
-      if (!pos.IsValid() || pos.ValueOrDie() > (size_t)GetSize()) {
-        return FALSE;
-      }
-    }
-    return (FX_BOOL)m_pFile->ReadPos(buffer, size, pos.ValueOrDie());
+    return (FX_BOOL)m_pFile->ReadPos(buffer, size, offset);
   }
   virtual size_t ReadBlock(void* buffer, size_t size) override {
-    if (m_bUseRange) {
-      FX_FILESIZE availSize = m_nOffset + m_nSize - m_pFile->GetPosition();
-      if ((size_t)availSize < size) {
-        size -= size - (size_t)availSize;
-      }
-    }
     return m_pFile->Read(buffer, size);
   }
   virtual FX_BOOL WriteBlock(const void* buffer,
                              FX_FILESIZE offset,
                              size_t size) override {
-    if (m_bUseRange) {
-      offset += m_nOffset;
-    }
     return (FX_BOOL)m_pFile->WritePos(buffer, size, offset);
   }
   virtual FX_BOOL Flush() override { return m_pFile->Flush(); }
+
+ protected:
   IFXCRT_FileAccess* m_pFile;
   FX_DWORD m_dwCount;
-  FX_BOOL m_bUseRange;
-  FX_FILESIZE m_nOffset;
-  FX_FILESIZE m_nSize;
 };
 #define FX_MEMSTREAM_BlockSize (64 * 1024)
 #define FX_MEMSTREAM_Consecutive 0x01
 #define FX_MEMSTREAM_TakeOver 0x02
 class CFX_MemoryStream final : public IFX_MemoryStream {
  public:
   CFX_MemoryStream(FX_BOOL bConsecutive)
       : m_dwCount(1),
         m_nTotalSize(0),
         m_nCurSize(0),
         m_nCurPos(0),
-        m_nGrowSize(FX_MEMSTREAM_BlockSize),
-        m_bUseRange(FALSE) {
+        m_nGrowSize(FX_MEMSTREAM_BlockSize) {
     m_dwFlags =
         FX_MEMSTREAM_TakeOver | (bConsecutive ? FX_MEMSTREAM_Consecutive : 0);
   }
   CFX_MemoryStream(uint8_t* pBuffer, size_t nSize, FX_BOOL bTakeOver)
       : m_dwCount(1),
         m_nTotalSize(nSize),
         m_nCurSize(nSize),
         m_nCurPos(0),
-        m_nGrowSize(FX_MEMSTREAM_BlockSize),
-        m_bUseRange(FALSE) {
+        m_nGrowSize(FX_MEMSTREAM_BlockSize) {
     m_Blocks.Add(pBuffer);
     m_dwFlags =
         FX_MEMSTREAM_Consecutive | (bTakeOver ? FX_MEMSTREAM_TakeOver : 0);
   }
   ~CFX_MemoryStream() {
     if (m_dwFlags & FX_MEMSTREAM_TakeOver) {
       for (int32_t i = 0; i < m_Blocks.GetSize(); i++) {
         FX_Free((uint8_t*)m_Blocks[i]);
       }
     }
     m_Blocks.RemoveAll();
   }
   virtual IFX_FileStream* Retain() override {
     m_dwCount++;
     return this;
   }
   virtual void Release() override {
     FX_DWORD nCount = --m_dwCount;
     if (nCount) {
       return;
     }
     delete this;
   }
   virtual FX_FILESIZE GetSize() override {
-    return m_bUseRange ? (FX_FILESIZE)m_nSize : (FX_FILESIZE)m_nCurSize;
+    return (FX_FILESIZE)m_nCurSize;
   }
   virtual FX_BOOL IsEOF() override { return m_nCurPos >= (size_t)GetSize(); }
   virtual FX_FILESIZE GetPosition() override {
-    FX_FILESIZE pos = (FX_FILESIZE)m_nCurPos;
-    if (m_bUseRange) {
-      pos -= (FX_FILESIZE)m_nOffset;
-    }
-    return pos;
+    return (FX_FILESIZE)m_nCurPos;
   }
-  virtual FX_BOOL SetRange(FX_FILESIZE offset, FX_FILESIZE size) override {
-    if (offset < 0 || size < 0) {
-      return FALSE;
-    }
-    FX_SAFE_FILESIZE range = size;
-    range += offset;
-    if (!range.IsValid() || range.ValueOrDie() > m_nCurSize) {
-      return FALSE;
-    }
-
-    m_nOffset = (size_t)offset, m_nSize = (size_t)size;
-    m_bUseRange = TRUE;
-    m_nCurPos = m_nOffset;
-    return TRUE;
-  }
-  virtual void ClearRange() override { m_bUseRange = FALSE; }
   virtual FX_BOOL ReadBlock(void* buffer,
                             FX_FILESIZE offset,
                             size_t size) override {
     if (!buffer || !size) {
       return FALSE;
     }
 
-    FX_SAFE_FILESIZE safeOffset = offset;
-    if (m_bUseRange) {
-      safeOffset += m_nOffset;
-    }
-
-    if (!safeOffset.IsValid()) {
-      return FALSE;
-    }
-
-    offset = safeOffset.ValueOrDie();
-
     FX_SAFE_SIZE_T newPos = size;
     newPos += offset;
     if (!newPos.IsValid() || newPos.ValueOrDefault(0) == 0 ||
         newPos.ValueOrDie() > m_nCurSize) {
       return FALSE;
     }
 
     m_nCurPos = newPos.ValueOrDie();
     if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
       FXSYS_memcpy(buffer, (uint8_t*)m_Blocks[0] + (size_t)offset, size);
@@ skipping 12 matching lines @@
       size -= nRead;
       nStartBlock++;
       offset = 0;
     }
     return TRUE;
   }
   virtual size_t ReadBlock(void* buffer, size_t size) override {
     if (m_nCurPos >= m_nCurSize) {
       return 0;
     }
-    if (m_bUseRange) {
-      size_t availSize = m_nOffset + m_nSize - m_nCurPos;
-      if (availSize < size) {
-        size -= size - (size_t)availSize;
-      }
-    }
     size_t nRead = FX_MIN(size, m_nCurSize - m_nCurPos);
     if (!ReadBlock(buffer, (int32_t)m_nCurPos, nRead)) {
       return 0;
     }
     return nRead;
   }
   virtual FX_BOOL WriteBlock(const void* buffer,
                              FX_FILESIZE offset,
                              size_t size) override {
     if (!buffer || !size) {
       return FALSE;
     }
-    if (m_bUseRange) {
-      offset += (FX_FILESIZE)m_nOffset;
-    }
     if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
       FX_SAFE_SIZE_T newPos = size;
       newPos += offset;
       if (!newPos.IsValid())
         return FALSE;
 
       m_nCurPos = newPos.ValueOrDie();
       if (m_nCurPos > m_nTotalSize) {
         m_nTotalSize =
             (m_nCurPos + m_nGrowSize - 1) / m_nGrowSize * m_nGrowSize;
@@ skipping 64 matching lines @@
                             FX_BOOL bTakeOver = FALSE) override {
     if (!(m_dwFlags & FX_MEMSTREAM_Consecutive)) {
       return;
     }
     m_Blocks.RemoveAll();
     m_Blocks.Add(pBuffer);
     m_nTotalSize = m_nCurSize = nSize;
     m_nCurPos = 0;
     m_dwFlags =
         FX_MEMSTREAM_Consecutive | (bTakeOver ? FX_MEMSTREAM_TakeOver : 0);
-    ClearRange();
   }
   virtual void DetachBuffer() override {
     if (!(m_dwFlags & FX_MEMSTREAM_Consecutive)) {
       return;
     }
     m_Blocks.RemoveAll();
     m_nTotalSize = m_nCurSize = m_nCurPos = 0;
     m_dwFlags = FX_MEMSTREAM_TakeOver;
-    ClearRange();
   }
 
  protected:
   CFX_PtrArray m_Blocks;
   FX_DWORD m_dwCount;
   size_t m_nTotalSize;
   size_t m_nCurSize;
   size_t m_nCurPos;
   size_t m_nGrowSize;
   FX_DWORD m_dwFlags;
-  FX_BOOL m_bUseRange;
-  size_t m_nOffset;
-  size_t m_nSize;
   FX_BOOL ExpandBlocks(size_t size) {
     if (m_nCurSize < size) {
       m_nCurSize = size;
     }
     if (size <= m_nTotalSize) {
       return TRUE;
     }
     int32_t iCount = m_Blocks.GetSize();
     size = (size - m_nTotalSize + m_nGrowSize - 1) / m_nGrowSize;
     m_Blocks.SetSize(m_Blocks.GetSize() + (int32_t)size);
@@ skipping 24 matching lines @@
 } FX_MTRANDOMCONTEXT, *FX_LPMTRANDOMCONTEXT;
 typedef FX_MTRANDOMCONTEXT const* FX_LPCMTRANDOMCONTEXT;
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 FX_BOOL FX_GenerateCryptoRandom(FX_DWORD* pBuffer, int32_t iCount);
 #endif
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // CORE_SRC_FXCRT_EXTENSION_H_