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// --------------------------------------------------------------------------
//
// File
// Name: IOStreamGetLine.cpp
// Purpose: Line based file descriptor reading
// Created: 2003/07/24
//
// --------------------------------------------------------------------------
#include "Box.h"
#include "IOStreamGetLine.h"
#include "CommonException.h"
#include "MemLeakFindOn.h"
// utility whitespace function
inline bool iw(int c)
{
return (c == ' ' || c == '\t' || c == '\v' || c == '\f'); // \r, \n are already excluded
}
// --------------------------------------------------------------------------
//
// Function
// Name: IOStreamGetLine::IOStreamGetLine(int)
// Purpose: Constructor, taking file descriptor
// Created: 2003/07/24
//
// --------------------------------------------------------------------------
IOStreamGetLine::IOStreamGetLine(IOStream &Stream)
: mrStream(Stream),
mLineNumber(0),
mBufferBegin(0),
mBytesInBuffer(0),
mPendingEOF(false),
mEOF(false)
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: IOStreamGetLine::~IOStreamGetLine()
// Purpose: Destructor
// Created: 2003/07/24
//
// --------------------------------------------------------------------------
IOStreamGetLine::~IOStreamGetLine()
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: IOStreamGetLine::GetLine(std::string &, bool, int)
// Purpose: Gets a line from the file, returning it in rOutput. If Preprocess is true, leading
// and trailing whitespace is removed, and comments (after #)
// are deleted.
// Returns true if a line is available now, false if retrying may get a line (eg timeout, signal),
// and exceptions if it's EOF.
// Created: 2003/07/24
//
// --------------------------------------------------------------------------
bool IOStreamGetLine::GetLine(std::string &rOutput, bool Preprocess, int Timeout)
{
// EOF?
if(mEOF) {THROW_EXCEPTION(CommonException, GetLineEOF)}
// Initialise string to stored into
std::string r(mPendingString);
mPendingString.erase();
bool foundLineEnd = false;
while(!foundLineEnd && !mEOF)
{
// Use any bytes left in the buffer
while(mBufferBegin < mBytesInBuffer)
{
int c = mBuffer[mBufferBegin++];
if(c == '\r')
{
// Ignore nasty Windows line ending extra chars
}
else if(c == '\n')
{
// Line end!
foundLineEnd = true;
break;
}
else
{
// Add to string
r += c;
}
// Implicit line ending at EOF
if(mBufferBegin >= mBytesInBuffer && mPendingEOF)
{
foundLineEnd = true;
}
}
// Check size
if(r.size() > IOSTREAMGETLINE_MAX_LINE_SIZE)
{
THROW_EXCEPTION(CommonException, GetLineTooLarge)
}
// Read more in?
if(!foundLineEnd && mBufferBegin >= mBytesInBuffer && !mPendingEOF)
{
int bytes = mrStream.Read(mBuffer, sizeof(mBuffer), Timeout);
// Adjust buffer info
mBytesInBuffer = bytes;
mBufferBegin = 0;
// EOF / closed?
if(!mrStream.StreamDataLeft())
{
mPendingEOF = true;
}
// No data returned?
if(bytes == 0 && mrStream.StreamDataLeft())
{
// store string away
mPendingString = r;
// Return false;
return false;
}
}
// EOF?
if(mPendingEOF && mBufferBegin >= mBytesInBuffer)
{
// File is EOF, and now we've depleted the buffer completely, so tell caller as well.
mEOF = true;
}
}
if(!Preprocess)
{
rOutput = r;
return true;
}
else
{
// Check for comment char, but char before must be whitespace
int end = 0;
int size = r.size();
while(end < size)
{
if(r[end] == '#' && (end == 0 || (iw(r[end-1]))))
{
break;
}
end++;
}
// Remove whitespace
int begin = 0;
while(begin < size && iw(r[begin]))
{
begin++;
}
if(!iw(r[end])) end--;
while(end > begin && iw(r[end]))
{
end--;
}
// Return a sub string
rOutput = r.substr(begin, end - begin + 1);
return true;
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: IOStreamGetLine::DetachFile()
// Purpose: Detaches the file handle, setting the file pointer correctly.
// Probably not good for sockets...
// Created: 2003/07/24
//
// --------------------------------------------------------------------------
void IOStreamGetLine::DetachFile()
{
// Adjust file pointer
int bytesOver = mBytesInBuffer - mBufferBegin;
ASSERT(bytesOver >= 0);
if(bytesOver > 0)
{
mrStream.Seek(0 - bytesOver, IOStream::SeekType_Relative);
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: IOStreamGetLine::IgnoreBufferedData(int)
// Purpose: Ignore buffered bytes (effectively removing them from the
// beginning of the buffered data.)
// Cannot remove more bytes than are currently in the buffer.
// Be careful when this is used!
// Created: 22/12/04
//
// --------------------------------------------------------------------------
void IOStreamGetLine::IgnoreBufferedData(int BytesToIgnore)
{
int bytesInBuffer = mBytesInBuffer - mBufferBegin;
if(BytesToIgnore < 0 || BytesToIgnore > bytesInBuffer)
{
THROW_EXCEPTION(CommonException, IOStreamGetLineNotEnoughDataToIgnore)
}
mBufferBegin += BytesToIgnore;
}
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