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/**
* @file llbufferstream.cpp
* @author Phoenix
* @date 2005-10-10
* @brief Implementation of the buffer iostream classes
*
* Copyright (c) 2005-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#include "linden_common.h"
#include "llbufferstream.h"
#include "llbuffer.h"
#include "llmemtype.h"
static const S32 DEFAULT_OUTPUT_SEGMENT_SIZE = 1024 * 4;
/*
* LLBufferStreamBuf
*/
LLBufferStreamBuf::LLBufferStreamBuf(
const LLChannelDescriptors& channels,
LLBufferArray* buffer) :
mChannels(channels),
mBuffer(buffer)
{
LLMemType m1(LLMemType::MTYPE_IO_BUFFER);
}
LLBufferStreamBuf::~LLBufferStreamBuf()
{
LLMemType m1(LLMemType::MTYPE_IO_BUFFER);
sync();
}
// virtual
int LLBufferStreamBuf::underflow()
{
LLMemType m1(LLMemType::MTYPE_IO_BUFFER);
//lldebugs << "LLBufferStreamBuf::underflow()" << llendl;
if(!mBuffer)
{
return EOF;
}
LLSegment segment;
LLBufferArray::segment_iterator_t it;
U8* last_pos = (U8*)gptr();
if(last_pos) --last_pos;
LLBufferArray::segment_iterator_t end = mBuffer->endSegment();
// Get iterator to full segment containing last_pos
// and construct sub-segment starting at last_pos.
// Note: segment may != *it at this point
it = mBuffer->constructSegmentAfter(last_pos, segment);
if(it == end)
{
return EOF;
}
// Iterate through segments to find a non-empty segment on input channel.
while((!segment.isOnChannel(mChannels.in()) || (segment.size() == 0)))
{
++it;
if(it == end)
{
return EOF;
}
segment = *it;
}
char* start = (char*)segment.data();
setg(start, start, start + segment.size());
return *gptr();
}
// virtual
int LLBufferStreamBuf::overflow(int c)
{
LLMemType m1(LLMemType::MTYPE_IO_BUFFER);
if(!mBuffer)
{
return EOF;
}
if(EOF == c)
{
// if someone puts an EOF, I suppose we should sync and return
// success.
if(0 == sync())
{
return 1;
}
else
{
return EOF;
}
}
// since we got here, we have a buffer, and we have a character to
// put on it.
LLBufferArray::segment_iterator_t it;
it = mBuffer->makeSegment(mChannels.out(), DEFAULT_OUTPUT_SEGMENT_SIZE);
if(it != mBuffer->endSegment())
{
char* start = (char*)(*it).data();
(*start) = (char)(c);
setp(start + 1, start + (*it).size());
return c;
}
else
{
return EOF;
}
}
// virtual
int LLBufferStreamBuf::sync()
{
LLMemType m1(LLMemType::MTYPE_IO_BUFFER);
int return_value = -1;
if(!mBuffer)
{
return return_value;
}
// set the put pointer so that we force an overflow on the next
// write.
U8* address = (U8*)pptr();
setp(NULL, NULL);
// *NOTE: I bet we could just --address. Need to think about that.
address = mBuffer->seek(mChannels.out(), address, -1);
if(address)
{
LLBufferArray::segment_iterator_t it;
it = mBuffer->splitAfter(address);
LLBufferArray::segment_iterator_t end = mBuffer->endSegment();
if(it != end)
{
++it;
if(it != end)
{
mBuffer->eraseSegment(it);
}
return_value = 0;
}
}
else
{
// nothing was put on the buffer, so the sync() is a no-op.
return_value = 0;
}
return return_value;
}
// virtual
#if( LL_WINDOWS || __GNUC__ > 2)
LLBufferStreamBuf::pos_type LLBufferStreamBuf::seekoff(
LLBufferStreamBuf::off_type off,
std::ios::seekdir way,
std::ios::openmode which)
#else
streampos LLBufferStreamBuf::seekoff(
streamoff off,
std::ios::seekdir way,
std::ios::openmode which)
#endif
{
LLMemType m1(LLMemType::MTYPE_IO_BUFFER);
if(!mBuffer
|| ((way == std::ios::beg) && (off < 0))
|| ((way == std::ios::end) && (off > 0)))
{
return -1;
}
U8* address = NULL;
if(which & std::ios::in)
{
U8* base_addr = NULL;
switch(way)
{
case std::ios::end:
base_addr = (U8*)LLBufferArray::npos;
break;
case std::ios::cur:
// get the current get pointer and adjust it for buffer
// array semantics.
base_addr = (U8*)gptr();
break;
case std::ios::beg:
default:
// NULL is fine
break;
}
address = mBuffer->seek(mChannels.in(), base_addr, off);
if(address)
{
LLBufferArray::segment_iterator_t iter;
iter = mBuffer->getSegment(address);
char* start = (char*)(*iter).data();
setg(start, (char*)address, start + (*iter).size());
}
else
{
address = (U8*)(-1);
}
}
if(which & std::ios::out)
{
U8* base_addr = NULL;
switch(way)
{
case std::ios::end:
base_addr = (U8*)LLBufferArray::npos;
break;
case std::ios::cur:
// get the current put pointer and adjust it for buffer
// array semantics.
base_addr = (U8*)pptr();
break;
case std::ios::beg:
default:
// NULL is fine
break;
}
address = mBuffer->seek(mChannels.out(), base_addr, off);
if(address)
{
LLBufferArray::segment_iterator_t iter;
iter = mBuffer->getSegment(address);
setp((char*)address, (char*)(*iter).data() + (*iter).size());
}
else
{
address = (U8*)(-1);
}
}
#if( LL_WINDOWS || __GNUC__ > 2 )
S32 rv = (S32)(intptr_t)address;
return (pos_type)rv;
#else
return (streampos)address;
#endif
}
/*
* LLBufferStream
*/
LLBufferStream::LLBufferStream(
const LLChannelDescriptors& channels,
LLBufferArray* buffer) :
std::iostream(&mStreamBuf),
mStreamBuf(channels, buffer)
{
LLMemType m1(LLMemType::MTYPE_IO_BUFFER);
}
LLBufferStream::~LLBufferStream()
{
LLMemType m1(LLMemType::MTYPE_IO_BUFFER);
}
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