From deadbfb7874ee8627d3a27efcfb965233f0c5cd4 Mon Sep 17 00:00:00 2001
From: Dan Sinclair <dsinclair@chromium.org>
Date: Wed, 12 Apr 2017 14:27:01 -0400
Subject: Remove params from CFGAS_Stream

This Cl removes members from CFGAS_Stream which just mirror values that
are stored in the stream impl or values which aren't used.

Change-Id: Ia2da5a645f4dd3399b3452fd56d833fed341390c
Reviewed-on: https://pdfium-review.googlesource.com/4056
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
---
 xfa/fgas/crt/ifgas_stream.cpp | 57 +++++++++----------------------------------
 1 file changed, 12 insertions(+), 45 deletions(-)

diff --git a/xfa/fgas/crt/ifgas_stream.cpp b/xfa/fgas/crt/ifgas_stream.cpp
index 38c94973d7..fa9b8db02d 100644
--- a/xfa/fgas/crt/ifgas_stream.cpp
+++ b/xfa/fgas/crt/ifgas_stream.cpp
@@ -130,10 +130,6 @@ class CFGAS_Stream : public IFGAS_Stream {
 
   std::unique_ptr<IFGAS_StreamImp> m_pStreamImp;
   uint32_t m_dwAccess;
-  int32_t m_iTotalSize;
-  int32_t m_iPosition;
-  int32_t m_iLength;
-  int32_t m_iRefCount;
 };
 
 class CFGAS_TextStream : public IFGAS_Stream {
@@ -511,12 +507,7 @@ int32_t CFGAS_TextStream::WriteString(const wchar_t* pStr, int32_t iLength) {
 
 CFGAS_Stream::CFGAS_Stream(std::unique_ptr<IFGAS_StreamImp> imp,
                            uint32_t dwAccess)
-    : m_pStreamImp(std::move(imp)),
-      m_dwAccess(dwAccess),
-      m_iTotalSize(0),
-      m_iPosition(0),
-      m_iLength(m_pStreamImp->GetLength()),
-      m_iRefCount(1) {}
+    : m_pStreamImp(std::move(imp)), m_dwAccess(dwAccess) {}
 
 CFGAS_Stream::~CFGAS_Stream() {}
 
@@ -531,15 +522,13 @@ int32_t CFGAS_Stream::GetLength() const {
 int32_t CFGAS_Stream::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
   if (!m_pStreamImp)
     return -1;
-  m_iPosition = m_pStreamImp->Seek(eSeek, iOffset);
-  return m_iPosition;
+  return m_pStreamImp->Seek(eSeek, iOffset);
 }
 
 int32_t CFGAS_Stream::GetPosition() {
   if (!m_pStreamImp)
     return -1;
-  m_iPosition = m_pStreamImp->GetPosition();
-  return m_iPosition;
+  return m_pStreamImp->GetPosition();
 }
 
 bool CFGAS_Stream::IsEOF() const {
@@ -551,15 +540,12 @@ int32_t CFGAS_Stream::ReadData(uint8_t* pBuffer, int32_t iBufferSize) {
   if (!m_pStreamImp)
     return -1;
 
-  int32_t iLen = std::min(m_iLength - m_iPosition, iBufferSize);
+  int32_t iLen = std::min(
+      m_pStreamImp->GetLength() - m_pStreamImp->GetPosition(), iBufferSize);
   if (iLen <= 0)
     return 0;
-  if (m_pStreamImp->GetPosition() != m_iPosition)
-    m_pStreamImp->Seek(FX_STREAMSEEK_Begin, m_iPosition);
 
-  iLen = m_pStreamImp->ReadData(pBuffer, iLen);
-  m_iPosition = m_pStreamImp->GetPosition();
-  return iLen;
+  return m_pStreamImp->ReadData(pBuffer, iLen);
 }
 
 int32_t CFGAS_Stream::ReadString(wchar_t* pStr,
@@ -569,18 +555,12 @@ int32_t CFGAS_Stream::ReadString(wchar_t* pStr,
   if (!m_pStreamImp)
     return -1;
 
-  int32_t iLen = std::min((m_iLength - m_iPosition) / 2, iMaxLength);
+  int32_t iLen =
+      std::min((m_pStreamImp->GetLength() - m_pStreamImp->GetPosition()) / 2,
+               iMaxLength);
   if (iLen <= 0)
     return 0;
-  if (m_pStreamImp->GetPosition() != m_iPosition)
-    m_pStreamImp->Seek(FX_STREAMSEEK_Begin, m_iPosition);
-
-  iLen = m_pStreamImp->ReadString(pStr, iLen, bEOS);
-  m_iPosition = m_pStreamImp->GetPosition();
-  if (iLen > 0 && m_iPosition >= m_iLength)
-    bEOS = true;
-
-  return iLen;
+  return m_pStreamImp->ReadString(pStr, iLen, bEOS);
 }
 
 int32_t CFGAS_Stream::WriteData(const uint8_t* pBuffer, int32_t iBufferSize) {
@@ -589,14 +569,7 @@ int32_t CFGAS_Stream::WriteData(const uint8_t* pBuffer, int32_t iBufferSize) {
     return -1;
   if ((m_dwAccess & FX_STREAMACCESS_Write) == 0)
     return -1;
-  if (m_pStreamImp->GetPosition() != m_iPosition)
-    m_pStreamImp->Seek(FX_STREAMSEEK_Begin, m_iPosition);
-
-  int32_t iLen = m_pStreamImp->WriteData(pBuffer, iBufferSize);
-  m_iPosition = m_pStreamImp->GetPosition();
-  m_iLength = std::max(m_iLength, m_iPosition);
-
-  return iLen;
+  return m_pStreamImp->WriteData(pBuffer, iBufferSize);
 }
 
 int32_t CFGAS_Stream::WriteString(const wchar_t* pStr, int32_t iLength) {
@@ -605,13 +578,7 @@ int32_t CFGAS_Stream::WriteString(const wchar_t* pStr, int32_t iLength) {
     return -1;
   if ((m_dwAccess & FX_STREAMACCESS_Write) == 0)
     return -1;
-  if (m_pStreamImp->GetPosition() != m_iPosition)
-    m_pStreamImp->Seek(FX_STREAMSEEK_Begin, m_iPosition);
-
-  int32_t iLen = m_pStreamImp->WriteString(pStr, iLength);
-  m_iPosition = m_pStreamImp->GetPosition();
-  m_iLength = std::max(m_iLength, m_iPosition);
-  return iLen;
+  return m_pStreamImp->WriteString(pStr, iLength);
 }
 
 void CFGAS_Stream::Flush() {
-- 
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