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/************************************************************************/
/* */
/* Simple io streams using the C stdio. */
/* */
/************************************************************************/
# include "config.h"
# include <stdlib.h>
# include <sioMemory.h>
# include <debugon.h>
void sioMemoryInit( MemoryBuffer * mb )
{
mb->mbCapacity= 0;
mb->mbBytes= (unsigned char *)0;
return;
}
void sioMemoryClean( MemoryBuffer * mb )
{
if ( mb->mbBytes )
{ free( mb->mbBytes ); }
mb->mbCapacity= 0;
mb->mbBytes= (unsigned char *)0;
return;
}
typedef struct SioMemoryPrivate
{
MemoryBuffer * smpBuffer;
int smpPosition;
} SioMemoryPrivate;
static int sioMemoryClose( void * voidsmp )
{ free( voidsmp ); return 0; }
static int sioInMemoryReadBytes( void * voidsmp,
unsigned char * buffer,
int count )
{
SioMemoryPrivate * smp= (SioMemoryPrivate *)voidsmp;
MemoryBuffer * mb= smp->smpBuffer;
if ( smp->smpPosition >= mb->mbCapacity )
{ return -1; }
if ( smp->smpPosition+ count > mb->mbCapacity )
{ count= mb->mbCapacity- smp->smpPosition; }
memcpy( buffer, mb->mbBytes+ smp->smpPosition, count );
smp->smpPosition += count;
return count;
}
static int sioMemorySeek( void * voidsmp,
long pos )
{
SioMemoryPrivate * smp= (SioMemoryPrivate *)voidsmp;
smp->smpPosition= pos;
return 0;
}
SimpleInputStream * sioInMemoryOpen( MemoryBuffer * mb )
{
SimpleInputStream * sis;
SioMemoryPrivate * smp;
smp= (SioMemoryPrivate *)malloc( sizeof(SioMemoryPrivate) );
if ( ! smp )
{ XDEB(smp); return (SimpleInputStream *)0; }
smp->smpBuffer= mb;
smp->smpPosition= 0;
sis= sioInOpen( (void *)smp,
sioInMemoryReadBytes, sioMemorySeek, sioMemoryClose );
if ( ! sis )
{ XDEB(sis); free( smp ); return (SimpleInputStream *)0; }
return sis;
}
static int sioOutMemoryWriteBytes( void * voidsmp,
const unsigned char * buffer,
int count )
{
SioMemoryPrivate * smp= (SioMemoryPrivate *)voidsmp;
MemoryBuffer * mb= smp->smpBuffer;
if ( smp->smpPosition+ count > mb->mbCapacity )
{
unsigned char * fresh;
fresh= (unsigned char *)realloc( mb->mbBytes, smp->smpPosition+ count );
if ( ! fresh )
{ LXDEB(smp->smpPosition+ count,fresh); return -1; }
mb->mbBytes= fresh;
}
memcpy( mb->mbBytes+ smp->smpPosition, buffer, count );
smp->smpPosition += count;
if ( mb->mbCapacity < smp->smpPosition )
{ mb->mbCapacity= smp->smpPosition; }
return count;
}
SimpleOutputStream * sioOutMemoryOpen( MemoryBuffer * mb )
{
SimpleOutputStream * sos;
SioMemoryPrivate * smp;
smp= (SioMemoryPrivate *)malloc( sizeof(SioMemoryPrivate) );
if ( ! smp )
{ XDEB(smp); return (SimpleOutputStream *)0; }
smp->smpBuffer= mb;
smp->smpPosition= 0;
sos= sioOutOpen( (void *)smp, sioOutMemoryWriteBytes,
sioMemorySeek, sioMemoryClose );
if ( ! sos )
{ XDEB(sos); free( smp ); return (SimpleOutputStream *)0; }
mb->mbCapacity= 0;
return sos;
}
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