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GLKeeper/src/BinaryInputStream.cpp at main · codenamecpp/GLKeeper · GitHub
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BinaryInputStream.cpp
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BinaryInputStream.cpp
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#
include
"
stdafx.h
"
#
include
"
BinaryInputStream.h
"
FileInputStream::~FileInputStream
()
{
CloseFileStream
();
}
bool
FileInputStream::OpenFileStream
(
const
std::string& filePath)
{
CloseFileStream
();
mFileStream
= ::
fopen
(filePath.
c_str
(),
"
rb
"
);
if
(
mFileStream
==
nullptr
)
return
false
;
::fseek
(
mFileStream
,
0
,
SEEK_END
);
mFileLength
= ::
ftell
(
mFileStream
);
::fseek
(
mFileStream
,
0
,
SEEK_SET
);
return
true
;
}
void
FileInputStream::CloseFileStream
()
{
if
(
mFileStream
)
{
::fclose
(
mFileStream
);
mFileStream
=
nullptr
;
}
mFileLength
=
0
;
mFileCursor
=
0
;
}
long
FileInputStream::GetCursorPosition
()
const
{
cxx_assert
(
mFileStream
);
if
(
mFileStream
)
{
return
::
ftell
(
mFileStream
);
}
return
0
;
}
bool
FileInputStream::SetCursorPosition
(
long
cursorPosition)
{
cxx_assert
(
mFileStream
);
if
(
mFileStream
)
{
return
::
fseek
(
mFileStream
, cursorPosition,
SEEK_SET
) ==
0
;
}
return
false
;
}
bool
FileInputStream::AdvanceCursorPosition
(
long
advancePosition)
{
cxx_assert
(
mFileStream
);
if
(
mFileStream
)
{
return
::
fseek
(
mFileStream
, advancePosition,
SEEK_CUR
) ==
0
;
}
return
false
;
}
long
FileInputStream::ReadData
(
void
* dataBuffer,
long
dataLength)
{
cxx_assert
(
mFileStream
);
cxx_assert
(dataBuffer);
if
(
mFileStream
&& dataBuffer)
{
return
::
fread
(dataBuffer,
1
, dataLength,
mFileStream
);
}
return
0
;
}
bool
FileInputStream::IsEndOfStream
()
const
{
cxx_assert
(
mFileStream
);
if
(
mFileStream
)
{
return
::
feof
(
mFileStream
) !=
0
;
}
return
false
;
}
long
FileInputStream::GetLength
()
const
{
return
mFileLength
;
}
//
////////////////////////////////////////////////////////////////////////
MemoryInputStream::~MemoryInputStream
()
{
CloseMemoryStream
();
}
void
MemoryInputStream::OpenMemoryStreamFromBuffer
(ByteArray& sourceBuffer)
{
CloseMemoryStream
();
mStreamData
.
swap
(sourceBuffer);
mStreamCursor
=
0
;
mStreamLength
=
mStreamData
.
size
();
}
void
MemoryInputStream::CloseMemoryStream
()
{
mStreamData
.
clear
();
mStreamCursor
=
0
;
mStreamLength
=
0
;
}
long
MemoryInputStream::GetCursorPosition
()
const
{
return
mStreamCursor
;
}
bool
MemoryInputStream::SetCursorPosition
(
long
cursorPosition)
{
mStreamCursor
=
std::min
(
mStreamLength
, cursorPosition);
return
true
;
}
bool
MemoryInputStream::AdvanceCursorPosition
(
long
advancePosition)
{
mStreamCursor
=
std::min
(
mStreamLength
,
mStreamCursor
+ advancePosition);
mStreamCursor
=
std::max
(
0L
,
mStreamCursor
);
return
true
;
}
long
MemoryInputStream::ReadData
(
void
* dataBuffer,
long
dataLength)
{
cxx_assert
(dataBuffer);
long
cursorPos =
std::min
(
mStreamLength
,
mStreamCursor
+ dataLength);
dataLength = (cursorPos -
mStreamCursor
);
if
(dataLength >
0
)
{
memcpy
(dataBuffer,
mStreamData
.
data
() +
mStreamCursor
, dataLength);
mStreamCursor
= cursorPos;
}
return
dataLength;
}
bool
MemoryInputStream::IsEndOfStream
()
const
{
return
mStreamCursor
==
mStreamLength
;
}
long
MemoryInputStream::GetLength
()
const
{
return
mStreamLength
;
}
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