libburnia/libburn
2
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

New API call burn_fifo_peek_data()

Browse Source
This commit is contained in:
Thomas Schmitt
2008-07-14 11:38:22 +00:00
parent 38f0399fff
commit 9d48bb6892
4 changed files with 114 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

61
libburn/file.c
View File

@ -540,3 +540,64 @@ int burn_fifo_inquire_status(struct burn_source *source,
return ret;
}
int burn_fifo_peek_data(struct burn_source *source, char *buf, int bufsize,
int flag)
{
int size, free_bytes, ret, wait_count= 0;
char *status_text;
struct burn_source_fifo *fs = source->data;
/* Eventually start fifo thread by reading 0 bytes */
ret = fifo_read(source, (unsigned char *) NULL, 0);
if (ret<0)
return 0;
/* wait for at least bufsize bytes being ready */
while (1) {
ret= burn_fifo_inquire_status(source,
&size, &free_bytes, &status_text);
if (size < bufsize) {
libdax_msgs_submit(libdax_messenger, -1, 0x0002015c,
LIBDAX_MSGS_SEV_FAILURE, LIBDAX_MSGS_PRIO_HIGH,
"Fifo size is smaller than desired peek buffer", 0, 0);
return -1;
}
if (fs->out_counter > 0 || (ret & 4) || fs->buf == NULL) {
libdax_msgs_submit(libdax_messenger, -1, 0x0002015e,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
"Fifo is already under consumption when peeking is desired",
0, 0);
return -1;
}
if(size - free_bytes >= bufsize) {
/* <<<
fprintf(stderr,
"libburn_DEBUG: after waiting cycle %d : fifo %s , %d bytes\n",
wait_count, status_text, size - free_bytes);
*/
memcpy(buf, fs->buf, bufsize);
return 1;
}
if (ret&2) { /* input has ended, not enough data arrived */
libdax_msgs_submit(libdax_messenger, -1, 0x0002015d,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"Fifo input ended short of desired peek buffer size",
0, 0);
return 0;
}
usleep(100000);
wait_count++;
/* <<<
if(wait_count%10==0)
fprintf(stderr,
"libburn_DEBUG: waiting cycle %d : fifo %s , %d bytes\n",
wait_count, status_text, size - free_bytes);
*/
}
return(0);
}