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Bug fix: Misinterpreted mode page 2A if block descriptors are present

This commit is contained in:
Thomas Schmitt 2011-11-03 13:08:44 +00:00
parent a1158a118b
commit b4ff95c2e7
2 changed files with 20 additions and 12 deletions
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2
cdrskin/cdrskin_timestamp.h
View File

@ -1 +1 @@
#define Cdrskin_timestamP "2011.11.02.130735"
#define Cdrskin_timestamP "2011.11.03.130710"

30
libburn/spc.c
View File

@ -348,7 +348,7 @@ static int spc_sense_caps_al(struct burn_drive *d, int *alloc_len, int flag)
struct buffer *buf = NULL;
struct scsi_mode_data *m;
int page_length, num_write_speeds = 0, i, speed, ret;
int old_alloc_len, was_error = 0;
int old_alloc_len, was_error = 0, block_descr_len;
unsigned char *page;
struct command *c = NULL;
struct burn_speed_descriptor *sd;
@ -371,10 +371,6 @@ static int spc_sense_caps_al(struct burn_drive *d, int *alloc_len, int flag)
memset(buf, 0, sizeof(struct buffer));
scsi_init_command(c, SPC_MODE_SENSE, sizeof(SPC_MODE_SENSE));
/*
memcpy(c->opcode, SPC_MODE_SENSE, sizeof(SPC_MODE_SENSE));
c->oplen = sizeof(SPC_MODE_SENSE);
*/
c->dxfer_len = *alloc_len;
c->opcode[7] = (c->dxfer_len >> 8) & 0xff;
c->opcode[8] = c->dxfer_len & 0xff;
@ -391,15 +387,22 @@ static int spc_sense_caps_al(struct burn_drive *d, int *alloc_len, int flag)
was_error = 1;
}
page = c->page->data + 8;
/* ts B11103 : qemu SCSI CD-ROM has Block Descriptor Length > 0.
The descriptors come between header and page.
*/
block_descr_len = c->page->data[6] * 256 + c->page->data[7];
/* Skip over Mode Data Header and block descriptors */
page = c->page->data + 8 + block_descr_len;
/* ts A61225 :
Although MODE SENSE indeed belongs to SPC, the returned code page
2Ah is part of MMC-1 to MMC-3. In MMC-1 5.2.3.4. it has 22 bytes,
in MMC-3 6.3.11 there are at least 28 bytes plus a variable length
set of speed descriptors. In MMC-5 E.11 it is declared "legacy".
ts B11031 : qemu emulates a pre-MMC-1 "DVD-ROM" (which makes not
much sense as DVD appeared first in MMC-3)
ts B11031 :
qemu emulates an ATAPI DVD-ROM, which delivers only a page length
of 18. This is now tolerated.
*/
/* ts A90603 :
SPC-1 8.3.3 enumerates mode page format bytes from 0 to n and
@ -413,7 +416,7 @@ static int spc_sense_caps_al(struct burn_drive *d, int *alloc_len, int flag)
if (page_length + 10 > old_alloc_len)
page_length = old_alloc_len - 10;
/* ts A90602 : 20 asserts page[21]. (see SPC-1 8.3.3) */
/* ts A90602 : page_length N asserts page[N+1]. (see SPC-1 8.3.3) */
/* ts B11031 : qemu drive has a page_length of 18 */
if (page_length < 18) {
m->valid = -1;
@ -548,7 +551,7 @@ ex:
void spc_sense_caps(struct burn_drive *d)
{
int alloc_len, start_len = 28, ret;
int alloc_len, start_len = 30, minimum_len = 28, ret;
mmc_start_if_needed(d, 1);
if (mmc_function_spy(d, "sense_caps") <= 0)
@ -561,7 +564,12 @@ void spc_sense_caps(struct burn_drive *d)
fprintf(stderr,"LIBBURN_DEBUG: 5Ah alloc_len = %d , ret = %d\n",
alloc_len, ret);
*/
if (alloc_len >= start_len && ret > 0)
/* ts B11103:
qemu ATAPI DVD-ROM delivers only 28.
SanDisk Cruzer U3 memory stick throws error on alloc_len < 30.
MMC-1 prescribes that 30 are available. qemu tolerates 30.
*/
if (alloc_len >= minimum_len && ret > 0)
/* second execution with announced length */
spc_sense_caps_al(d, &alloc_len, 0);
}