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/* Simple buffered version of file reader.
* JPEG decoding seems to work faster with it.
* Not fully tested. In case of any issues try FILEGETC (see SOURCES)
* */
#include "rb_glue.h"
static int fd;
static unsigned char buff[256]; //TODO: Adjust it...
static int length = 0;
static int cur_buff_pos = 0;
static int file_pos = 0;
extern int GETC(void)
{
if (cur_buff_pos >= length)
{
length = rb->read(fd, buff, sizeof(buff));
file_pos += length;
cur_buff_pos = 0;
}
return buff[cur_buff_pos++];
}
// multibyte readers: host-endian independent - if evaluated in right order (ie. don't optimize)
extern int GETWbi(void) // 16-bit big-endian
{
return ( GETC()<<8 ) | GETC();
}
extern int GETDbi(void) // 32-bit big-endian
{
return ( GETC()<<24 ) | ( GETC()<<16 ) | ( GETC()<<8 ) | GETC();
}
extern int GETWli(void) // 16-bit little-endian
{
return GETC() | ( GETC()<<8 );
}
extern int GETDli(void) // 32-bit little-endian
{
return GETC() | ( GETC()<<8 ) | ( GETC()<<16 ) | ( GETC()<<24 );
}
// seek
extern void SEEK(int d)
{
int newPos = cur_buff_pos + d;
if (newPos < length && newPos >= 0)
{
cur_buff_pos = newPos;
return;
}
file_pos = rb->lseek(fd, (cur_buff_pos - length) + d, SEEK_CUR);
cur_buff_pos = length = 0;
}
extern void POS(int d)
{
cur_buff_pos = length = 0;
file_pos = d;
rb->lseek(fd, d, SEEK_SET);
}
extern int TELL(void)
{
return file_pos + cur_buff_pos - length;
}
// OPEN/CLOSE file
extern void *OPEN(char *f)
{
printf("Opening %s\n", f);
cur_buff_pos = length = file_pos = 0;
fd = rb->open(f,O_RDONLY);
if ( fd < 0 )
{
printf("Error opening %s\n", f);
return NULL;
}
return &fd;
}
extern int CLOSE(void)
{
cur_buff_pos = length = file_pos = 0;
return rb->close(fd);
}
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