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This commit is contained in:
Brian Fiete 2019-08-23 11:56:54 -07:00
parent c74712dad9
commit 078564ac9e
3242 changed files with 1616395 additions and 0 deletions
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124
BeefySysLib/FileHandleStream.cpp Normal file
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#include "FileHandleStream.h"
USING_NS_BF;
FileHandleStream::FileHandleStream()
{
mFileHandle = NULL;
mCacheBuffer = NULL;
mCacheReadPos = -0x3FFFFFFF;
mCacheSize = 0;
mVFilePos = 0;
}
FileHandleStream::~FileHandleStream()
{
if (mCacheBuffer != NULL)
delete mCacheBuffer;
if (mFileHandle != NULL)
::CloseHandle_File(mFileHandle);
}
void FileHandleStream::SetCacheSize(int size)
{
size = (size + (4096 - 1)) & ~(4096 - 1);
mCacheReadPos = -0x3FFFFFFF;
delete mCacheBuffer;
if (size > 0)
mCacheBuffer = new uint8[size];
else
mCacheBuffer = NULL;
mCacheSize = size;
}
void FileHandleStream::Seek(int pos)
{
if (mCacheBuffer != NULL)
mVFilePos += pos;
else
::SetFilePointer(mFileHandle, pos, 0, FILE_CURRENT);
}
void FileHandleStream::SetPos(int pos)
{
if (mCacheBuffer != NULL)
mVFilePos = pos;
else
::SetFilePointer(mFileHandle, pos, 0, FILE_BEGIN);
}
bool FileHandleStream::Eof()
{
if (mCacheBuffer != NULL)
{
::SetFilePointer(mFileHandle, 0, 0, FILE_END);
return mVFilePos >= (int)::SetFilePointer(mFileHandle, 0, 0, FILE_CURRENT);
}
return ::SetFilePointer(mFileHandle, 0, 0, FILE_CURRENT) != ::GetFileSize(mFileHandle, NULL);
}
int FileHandleStream::GetSize()
{
return ::GetFileSize(mFileHandle, NULL);;
}
void FileHandleStream::Read(void* ptr, int size)
{
if (mCacheBuffer != NULL)
{
while (true)
{
int buffOffset = mVFilePos - mCacheReadPos;
if ((buffOffset >= 0) && (buffOffset + size < mCacheSize))
{
// If inside
memcpy(ptr, mCacheBuffer + buffOffset, size);
mVFilePos += size;
return;
}
else if ((buffOffset >= 0) && (buffOffset < mCacheSize))
{
int subSize = mCacheReadPos + mCacheSize - mVFilePos;
memcpy(ptr, mCacheBuffer + buffOffset, subSize);
mVFilePos += subSize;
ptr = (uint8*)ptr + subSize;
size -= subSize;
}
mCacheReadPos = mVFilePos & ~(4096 - 1);
::SetFilePointer(mFileHandle, mCacheReadPos, 0, FILE_BEGIN);
int aSize = 0;
::ReadFile(mFileHandle, mCacheBuffer, mCacheSize, (DWORD*)&aSize, NULL);
if (aSize != mCacheSize)
{
// Zero out underflow bytes
memset((uint8*)ptr + aSize, 0, mCacheSize - aSize);
}
}
}
else
{
int aSize = 0;
::ReadFile(mFileHandle, ptr, size, (DWORD*)&aSize, NULL);
if (aSize != size)
{
// Zero out underflow bytes
memset((uint8*)ptr + aSize, 0, size - aSize);
}
}
}
void FileHandleStream::Write(void* ptr, int size)
{
::WriteFile(mFileHandle, ptr, size, NULL, NULL);
}
int FileHandleStream::GetPos()
{
if (mCacheBuffer != NULL)
return mVFilePos;
return ::SetFilePointer(mFileHandle, 0, 0, FILE_CURRENT);
}