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Enabled recognition of multi-session emulation with partition offset 16 and GPT

This commit is contained in:
Thomas Schmitt 2023-07-12 20:32:56 +02:00
parent 9b17a8a24a
commit 11c5f6585a
2 changed files with 62 additions and 2 deletions
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62
libisoburn/isofs_wrap.c
View File

@ -87,6 +87,18 @@ uint32_t iso_read_lsb(const uint8_t *buf, int bytes)
}
static
uint64_t iso_read_lsb64(const uint8_t *buf)
{
int i;
uint64_t ret = 0;
for (i=0; i < 8; i++)
ret += ((uint64_t) buf[i]) << (i * 8);
return ret;
}
/* API function. See libisoburn.h
*/
IsoImage *isoburn_get_attached_image(struct burn_drive *d)
@ -640,6 +652,42 @@ int isoburn_get_img_partition_offset(struct burn_drive *drive,
}
/* Try to read partition start and size block number from given GPT entry */
int isoburn_get_gpt_entry(struct isoburn *o, int partno,
uint64_t *start_lba, uint64_t *size, int flag)
{
uint32_t part_start, entry_count, entry_size, part_lba, end_lba;
uint8_t *gpt, *part;
/* Check for GPT header block */
gpt = o->target_iso_head + 512;
if(memcmp(gpt, "EFI PART", 8) != 0)
return(0);
if(gpt[8] != 0x00 || gpt[9] != 0x00 || gpt[10] != 0x01 || gpt[11] != 0x00)
return(0);
part_start = iso_read_lsb64(gpt + 72);
entry_count = iso_read_lsb64(gpt + 80);
entry_size = iso_read_lsb64(gpt + 84);
/* Read partition entry */
if(partno < 1)
return(0);
if(((uint64_t) partno) > entry_count)
return(0);
if(part_start * 512 + partno * entry_size > 32768)
return(0);
part = o->target_iso_head + part_start * 512 + (partno - 1) * entry_size;
part_lba = iso_read_lsb64(part + 32);
end_lba = iso_read_lsb64(part + 40);
if(end_lba < part_lba)
return(0);
*start_lba = part_lba;
*size = end_lba - part_lba + 1;
return(1);
}
/* Check for MBR signature and a first partition that starts at a 2k block
and ends where the image ends.
If not too large or too small, accept its start as partition offset.
@ -649,6 +697,7 @@ static int isoburn_inspect_partition(struct isoburn *o, uint32_t img_size,
{
uint8_t *mbr, *part, *buf= NULL;
uint32_t offst, numsec;
uint64_t gpt_start_lba, gpt_size;
struct ecma119_pri_vol_desc *pvm;
off_t data_count;
int ret;
@ -671,9 +720,20 @@ static int isoburn_inspect_partition(struct isoburn *o, uint32_t img_size,
if(part[1] == 0 && part[2] == 0 && part[3] == 0)
{ret= 2; goto ex;} /* Zero C/H/S start address */
/* Does it match the normal ISO image ? */
offst= iso_read_lsb(part + 8, 4);
numsec= iso_read_lsb(part + 12, 4);
/* Is it GPT ? */
if(part[4] == 0xee && offst == 1) {
ret= isoburn_get_gpt_entry(o, 1, &gpt_start_lba, &gpt_size, 0);
if(ret > 0 && gpt_start_lba < ((uint64_t) 1) << 32 &&
gpt_size < ((uint64_t) 1) << 32) {
offst= gpt_start_lba;
numsec= gpt_size;
}
}
/* Does it match the normal ISO image ? */
if(offst < 64)
{ret= 2; goto ex;} /* Zero or unusably small partition start */
if((offst % 4) || (numsec % 4))

2
xorriso/xorriso_timestamp.h
View File

@ -1 +1 @@
#define Xorriso_timestamP "2023.06.07.200919"
#define Xorriso_timestamP "2023.07.12.182812"