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/************************************************************************/
/* */
/* Simple io streams, recursive use for packing in 255 byte blocks */
/* with a length indicator. */
/* [Like in the GIF spec.] */
/* */
/************************************************************************/
# include "appUtilConfig.h"
# include <stdlib.h>
# include <string.h>
# include "sioBlocked.h"
# include <appDebugon.h>
typedef struct BlockedInputStream
{
SimpleInputStream * bisBlocked;
unsigned char bisBytes[256];
int bisOffset;
int bisExhausted;
} BlockedInputStream;
static int sioInBlockedReadBytes( void * voidbis,
unsigned char * buffer,
int count )
{
BlockedInputStream * bis= (BlockedInputStream *)voidbis;
int done= 0;
int todo;
if ( bis->bisExhausted )
{ return -1; }
if ( bis->bisOffset < bis->bisBytes[0]+ 1 )
{
todo= bis->bisBytes[0]+ 1- bis->bisOffset;
if ( todo > count )
{ todo= count; }
memcpy( buffer, bis->bisBytes+ bis->bisOffset, todo );
bis->bisOffset += todo;
buffer += todo;
done += todo;
}
while( done < count )
{
if ( bis->bisOffset != bis->bisBytes[0]+ 1 )
{ LLDEB(bis->bisOffset,bis->bisBytes[0]); }
bis->bisOffset= 1;
todo= sioInGetCharacter( bis->bisBlocked );
if ( todo == EOF )
{ LDEB(todo); bis->bisExhausted= 1; return -1; }
bis->bisBytes[0]= todo;
if ( bis->bisBytes[0] == 0 )
{ bis->bisExhausted= 1; break; }
if ( todo > count- done )
{
if ( sioInReadBytes( bis->bisBlocked, bis->bisBytes+ 1,
todo ) != todo )
{ LDEB(todo); bis->bisExhausted= 1; return -1; }
todo= count- done;
memcpy( buffer, bis->bisBytes+ 1, todo );
}
else{
if ( sioInReadBytes( bis->bisBlocked, buffer, todo ) != todo )
{ LDEB(todo); bis->bisExhausted= 1; return -1; }
}
bis->bisOffset= 1+ todo;
buffer += todo;
done += todo;
}
return done;
}
/************************************************************************/
/* */
/* Close a Blocked Input stream. */
/* */
/* 1) First drain it. */
/* */
/************************************************************************/
static int sioInBlockedClose( void * voidbis )
{
int rval= 0;
BlockedInputStream * bis= (BlockedInputStream *)voidbis;
/* 1 */
while ( ! bis->bisExhausted )
{
unsigned char bytes[SIOsizBUF];
if ( sioInBlockedReadBytes( voidbis, bytes, SIOsizBUF ) < 0 )
{ LDEB(1); rval= -1; break; }
}
free( voidbis );
return rval;
}
SimpleInputStream * sioInBlockedOpen( SimpleInputStream * sisBlocked )
{
SimpleInputStream * sis;
BlockedInputStream * bis;
bis= (BlockedInputStream *)malloc( sizeof(BlockedInputStream) );
if ( ! bis )
{ XDEB(bis); return (SimpleInputStream *)0; }
bis->bisBlocked= sisBlocked;
bis->bisBytes[0]= 0;
bis->bisOffset= 1;
bis->bisExhausted= 0;
sis= sioInOpen( (void *)bis, sioInBlockedReadBytes, sioInBlockedClose );
if ( ! sis )
{ XDEB(sis); free( bis ); return (SimpleInputStream *)0; }
return sis;
}
/************************************************************************/
/* */
/* Output. */
/* */
/************************************************************************/
typedef struct BlockedOutputStream
{
SimpleOutputStream * bosSosBlocked;
unsigned char bosBytes[256];
} BlockedOutputStream;
/************************************************************************/
/* */
/* Close a blocked stream. */
/* */
/* 1) If necessary flush the cache. */
/* 2) Should be impossible. */
/* 3) Superfluous, but it feels nice to have predictable values in */
/* the buffer. */
/* 4) Emit the remaining digits and the padding '=' characters. */
/* */
/************************************************************************/
static int sioOutBlockedClose( void * voidbos )
{
int rval= 0;
BlockedOutputStream * bos= (BlockedOutputStream *)voidbos;
/* 1 */
if ( bos->bosBytes[0] > 0 )
{
if ( sioOutWriteBytes( bos->bosSosBlocked, bos->bosBytes,
bos->bosBytes[0]+ 1 ) != bos->bosBytes[0]+ 1 )
{ LDEB(bos->bosBytes[0]); rval= -1; }
}
sioOutPutCharacter( '\0', bos->bosSosBlocked );
free( bos );
return rval;
}
/************************************************************************/
/* */
/* Write bytes in 255 byte blocks with a length indicator. */
/* */
/************************************************************************/
static int sioOutBlockedWriteBytes( void * voidbos,
const unsigned char * buffer,
int count )
{
BlockedOutputStream * bos= (BlockedOutputStream *)voidbos;
int done= 0;
while( done < count )
{
int todo;
todo= count- done;
if ( todo > 255- bos->bosBytes[0] )
{ todo= 255- bos->bosBytes[0]; }
memcpy( bos->bosBytes+ bos->bosBytes[0]+ 1, buffer, todo );
bos->bosBytes[0] += todo;
if ( bos->bosBytes[0] == 255 )
{
if ( sioOutWriteBytes( bos->bosSosBlocked, bos->bosBytes,
bos->bosBytes[0]+ 1 ) != bos->bosBytes[0]+ 1 )
{ LDEB(bos->bosBytes[0]); return -1; }
bos->bosBytes[0]= 0;
}
buffer += todo;
done += todo;
}
return count;
}
SimpleOutputStream * sioOutBlockedOpen( SimpleOutputStream * sosBlocked )
{
SimpleOutputStream * sos;
BlockedOutputStream * bos;
bos= (BlockedOutputStream *)malloc( sizeof(BlockedOutputStream) );
if ( ! bos )
{ XDEB(bos); return (SimpleOutputStream *)0; }
bos->bosSosBlocked= sosBlocked;
bos->bosBytes[0]= 0;
sos= sioOutOpen( (void *)bos, sioOutBlockedWriteBytes,
(SIOoutSEEK)0, sioOutBlockedClose );
if ( ! sos )
{ XDEB(sos); free( bos ); return (SimpleOutputStream *)0; }
return sos;
}
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