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New API function burn_read_data()

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This commit is contained in:
Thomas Schmitt
2007-08-12 15:25:56 +00:00
parent 12b6a07e9f
commit d21697b289
8 changed files with 161 additions and 4 deletions
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71
libburn/read.c
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@ -31,6 +31,12 @@
#include "read.h"
#include "options.h"
/* ts A70812 */
#include "error.h"
#include "libdax_msgs.h"
extern struct libdax_msgs *libdax_messenger;
void burn_disc_read(struct burn_drive *d, const struct burn_read_opts *o)
{
#if 0
@ -280,3 +286,68 @@ static void flipq(unsigned char *sub)
*(sub + 12 + 11) = ~*(sub + 12 + 11);
}
*/
/* ts A70812 : API function */
int burn_read_data(struct burn_drive *d, off_t byte_address,
char data[], off_t data_size, off_t *data_count, int flag)
{
int alignment = 2048, start, upto, chunksize, err, cpy_size;
char msg[81], *wpt;
struct buffer buf;
*data_count = 0;
if (d->released) {
libdax_msgs_submit(libdax_messenger,
d->global_index, 0x00020142,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
"Drive is not grabbed on random access write", 0, 0);
return 0;
}
if ((byte_address % alignment) != 0) {
sprintf(msg,
"Read start address not properly aligned (%d bytes)",
alignment);
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020143,
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, 0x00020145,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
"Drive is busy on attempt to read data", 0, 0);
return 0;
}
d->busy = BURN_DRIVE_READING;
d->buffer = &buf;
start = byte_address / 2048;
upto = start + data_size / 2048;
if (data_size % 2048)
upto++;
wpt = data;
for (; start < upto; start += 16) {
chunksize = upto - start;
if (chunksize > 16) {
chunksize = 16;
cpy_size = 16 * 2048;
} else
cpy_size = data_size - *data_count;
err = d->read_10(d, start, chunksize, d->buffer);
if (err == BE_CANCELLED) {
d->busy = BURN_DRIVE_IDLE;
return 0;
}
memcpy(wpt, d->buffer->data, cpy_size);
wpt += cpy_size;
*data_count += cpy_size;
}
d->buffer = NULL;
d->busy = BURN_DRIVE_IDLE;
return 1;
}