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New API function burn_random_access_write()

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This commit is contained in:
Thomas Schmitt
2007-08-11 20:16:57 +00:00
parent bdba12f0f9
commit 9078e65ae6
4 changed files with 121 additions and 9 deletions
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85
libburn/trunk/libburn/write.c
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@ -1523,7 +1523,7 @@ int burn_dvd_write_sync(struct burn_write_opts *o,
sprintf(msg,
"Write start address not properly aligned to 2048");
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020125,
0x00020126,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
goto early_failure;
@ -1553,7 +1553,7 @@ int burn_dvd_write_sync(struct burn_write_opts *o,
sprintf(msg,
"Write start address not properly aligned to 32K");
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020125,
0x00020126,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
goto early_failure;
@ -1636,7 +1636,7 @@ int burn_dvd_write_sync(struct burn_write_opts *o,
if (o->start_byte >= 0) {
sprintf(msg, "Write start address not supported");
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020124,
0x00020125,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
goto early_failure;
@ -1969,3 +1969,82 @@ fail_wo_sync:;
d->cancel = 1;
d->busy = BURN_DRIVE_IDLE;
}
int burn_random_access_write(struct burn_drive *d, off_t byte_address,
char *data, off_t data_count, int flag)
{
int alignment = 0, start, upto, chunksize, err;
char msg[81], *rpt;
struct buffer buf;
if (d->current_profile == 0x12) /* DVD-RAM */
alignment = 2 * 1024;
if (d->current_profile == 0x13) /* DVD-RW restricted overwrite */
alignment = 32 * 1024;
if (d->current_profile == 0x1a) /* DVD+RW */
alignment = 2 * 1024;
if (alignment == 0) {
sprintf(msg, "Write start address not supported");
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020125,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
"Write start address not supported", 0, 0);
return 0;
}
if ((byte_address % alignment) != 0) {
sprintf(msg,
"Write start address not properly aligned (%d bytes)",
alignment);
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020126,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
return 0;
}
if ((data_count % alignment) != 0) {
sprintf(msg,
"Write data count not properly aligned (%ld bytes)",
(long) alignment);
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020141,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
return 0;
}
if (d->busy != BURN_DRIVE_IDLE) {
libdax_msgs_submit(libdax_messenger,
d->global_index, 0x00020140,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
"Drive is busy on attempt to write random access",0,0);
return 0;
}
d->busy = BURN_DRIVE_WRITING;
d->buffer = &buf;
start = byte_address / 2048;
upto = start + data_count / 2048;
rpt = data;
for (; start < upto; start += 16) {
chunksize = upto - start;
if (chunksize > 16)
chunksize = 16;
d->buffer->bytes = chunksize * 2048;
memcpy(d->buffer->data, rpt, d->buffer->bytes);
rpt += d->buffer->bytes;
d->buffer->sectors = chunksize;
d->nwa = start;
err = d->write(d, d->nwa, d->buffer);
if (err == BE_CANCELLED) {
d->busy = BURN_DRIVE_IDLE;
return (-(start * 2048 - byte_address));
}
}
if (flag & 1)
d->sync_cache(d);
d->busy = BURN_DRIVE_IDLE;
return(1);
}