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#include "SpoolRewindInputStream.hpp"
#include "Logger.hpp"
#include <algorithm>
#include <cstring>
#include <cassert>
// TODO: thread-safe and platform-conformant name of spool file
#ifndef _WIN32
#define SPOOL_FILE_NAME "/tmp/spool.tmp"
#else
#define SPOOL_FILE_NAME "C:\\TEMP\\SPOOL.TMP"
#endif
using namespace std;
spool_streambuf::spool_streambuf( size_t bufSize, size_t putBack, size_t spoolBufSize )
: m_putBack( max( putBack, size_t( 1 ) ) ),
m_spoolBuf( spoolBufSize ), m_spoolBufPos( 0 ),
m_spoolBufSize( spoolBufSize ), m_state( TO_SPOOL_MEMORY ),
m_buf( max( bufSize, putBack ) + putBack ),
m_base( 0 ), m_start( 0 )
{
char *end = &m_buf.front( ) + m_buf.size( );
setg( end, end, end );
}
spool_streambuf::~spool_streambuf( )
{
switch( m_state ) {
case TO_SPOOL_MEMORY:
case FROM_SPOOL_MEMORY:
// memory only, nothing to clean up
break;
case TO_SPOOL_FILE:
case FROM_SPOOL_FILE:
m_spoolFile.close( );
(void)remove( SPOOL_FILE_NAME );
break;
}
}
streambuf::int_type spool_streambuf::spoolSourceData( char *data, size_t n )
{
m_base = &m_buf.front( );
m_start = m_base;
size_t data_len = m_buf.size( ) - ( m_start - m_base ) ;
// more space than data, no problem
if( n < data_len ) {
data_len = n;
}
// enough space in the stream read buffer, put it there
memcpy( m_start, data, data_len );
setg( m_base, m_start, m_start + data_len );
data += data_len;
n -= data_len;
spoolData( data, n );
return data_len + n;
}
void spool_streambuf::spoolData( char *data, size_t n )
{
switch( m_state ) {
case TO_SPOOL_MEMORY:
// as long we can "spool" to memory, do so..
if( m_spoolBufPos + n <= m_spoolBufSize ) {
m_spoolBuf.insert( m_spoolBuf.begin( ) + m_spoolBufPos, data, data + n );
m_spoolBufPos += n;
} else {
// ..otherwise start spooling to disk, write
// current memory spool buffer first..
LOG( logWARNING ) << "Spooling spool buffer exceeded (>" << m_spoolBufSize << ")";
m_spoolFile.open( SPOOL_FILE_NAME, ios::binary | ios::out | ios::trunc );
assert( m_spoolFile.good( ) );
m_spoolFile.write( &m_spoolBuf.front( ), m_spoolBufSize );
assert( m_spoolFile.good( ) );
m_state = TO_SPOOL_FILE;
m_spoolFile.write( data, n );
assert( m_spoolFile.good( ) );
}
break;
case TO_SPOOL_FILE:
// we are appending to the spool file
assert( m_spoolFile.good( ) );
m_spoolFile.write( data, n );
assert( m_spoolFile.good( ) );
break;
case FROM_SPOOL_MEMORY:
case FROM_SPOOL_FILE:
throw logic_error( "Still getting data from source after rewind!" );
default:
throw logic_error( "Illegal state!" );
}
}
streambuf::int_type spool_streambuf::underflow( )
{
// check if buffer is exhausted, if not, return current character
if( gptr( ) < egptr( ) )
return traits_type::to_int_type( *gptr( ) );
m_base = &m_buf.front( );
m_start = m_base;
// move put back away
if( eback( ) == m_base ) {
memmove( m_base, egptr( ) - m_putBack, m_putBack );
m_start += m_putBack;
}
// read from source or spool (depends on calling rewind)
streambuf::int_type n;
switch( m_state ) {
case TO_SPOOL_MEMORY:
case TO_SPOOL_FILE:
n = readFromSource( );
if( n == 0 ) {
return traits_type::eof( );
} else if( n < 0 ) {
// TODO handle error
return traits_type::eof( );
}
spoolData( m_start, n );
break;
case FROM_SPOOL_MEMORY:
n = min( m_buf.size( ) - ( m_start - m_base ), m_spoolBufSize - m_spoolBufPos );
if( n == 0 ) {
return traits_type::eof( );
}
copy( m_spoolBuf.begin( ) + m_spoolBufPos,
m_spoolBuf.begin( ) + m_spoolBufPos + n,
m_buf.begin( ) + ( m_start - m_base ) );
m_spoolBufPos += n;
break;
case FROM_SPOOL_FILE:
n = min( m_buf.size( ) - ( m_start - m_base ), m_spoolBufSize - m_spoolBufPos );
m_spoolFile.read( m_start, n );
m_spoolBufPos += n;
if( m_spoolBufPos > m_spoolBufSize ) {
return traits_type::eof( );
}
if( n == 0 || m_spoolFile.eof( ) ) {
return traits_type::eof( );
}
break;
default:
throw logic_error( "Illegal state!" );
}
// set pointers
setg( m_base, m_start, m_start + n );
return traits_type::to_int_type( *gptr( ) );
}
void spool_streambuf::rewind( )
{
switch( m_state ) {
case TO_SPOOL_MEMORY:
m_spoolBufPos = 0;
m_state = FROM_SPOOL_MEMORY;
break;
case TO_SPOOL_FILE:
m_spoolFile.close( );
m_spoolFile.open( SPOOL_FILE_NAME, ios::binary | ios::in );
m_spoolFile.seekg( 0, ios::end );
m_spoolBufSize = m_spoolFile.tellg( );
m_spoolFile.seekg( 0, ios::beg );
m_spoolBufPos = 0;
m_state = FROM_SPOOL_FILE;
break;
case FROM_SPOOL_MEMORY:
m_spoolBufPos = 0;
break;
case FROM_SPOOL_FILE:
m_spoolBufPos = 0;
m_spoolFile.seekg( 0, ios::beg );
break;
}
char *end = &m_buf.front( ) + m_buf.size( );
setg( end, end, end );
pubseekpos( 0, ios_base::in );
}
SpoolRewindInputStream::SpoolRewindInputStream( const URL &url )
: RewindInputStream( url ), m_buf( 0 )
{
}
SpoolRewindInputStream::~SpoolRewindInputStream( )
{
}
void SpoolRewindInputStream::rewind( )
{
// consume rest of web request, force spooling in streambuf
enum { CHUNKSIZE = 1024 };
char buf[CHUNKSIZE];
while( good( ) && !eof( ) ) {
read( buf, CHUNKSIZE );
}
ios::clear( );
assert( m_buf != 0 );
m_buf->rewind( );
}
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