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Recognizing partition offset 16 if the MBR is a protective msdos label

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This commit is contained in:
Thomas Schmitt 2014-04-15 10:18:50 +02:00
parent 083795cba2
commit 593844b0ed
1 changed files with 40 additions and 18 deletions
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58
libisofs/fs_image.c
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@ -3846,17 +3846,45 @@ try_grub2_mbr:;
return 0;
}
static
int iso_analyze_partition_offset(IsoImage *image, IsoDataSource *src,
uint64_t start_block, int flag)
{
int ret;
uint8_t *buf = NULL;
off_t p_offset;
struct ecma119_pri_vol_desc *pvm;
struct iso_imported_sys_area *sai;
sai = image->imported_sa_info;
/* Check for PVD at partition start with same end */
LIBISO_ALLOC_MEM(buf, uint8_t, 2048);
p_offset = start_block / 4;
ret = src->read_block(src, p_offset + 16, buf);
if (ret > 0) {
pvm = (struct ecma119_pri_vol_desc *) buf;
if (strncmp((char*) pvm->std_identifier, "CD001", 5) == 0 &&
pvm->vol_desc_type[0] == 1 &&
pvm->vol_desc_version[0] == 1 &&
pvm->file_structure_version[0] == 1 &&
iso_read_lsb(pvm->vol_space_size, 4) + p_offset == sai->image_size)
sai->partition_offset = p_offset;
}
ret = 1;
ex:;
LIBISO_FREE_MEM(buf);
return ret;
}
static
int iso_analyze_mbr(IsoImage *image, IsoDataSource *src, int flag)
{
int sub_type = 2, ret, is_isohybrid = 0, is_grub2_mbr = 0;
int is_protective_label = 0;
char *sad;
off_t p_offset;
uint8_t *buf = NULL;
struct iso_imported_sys_area *sai;
struct iso_mbr_partition_request *part;
struct ecma119_pri_vol_desc *pvm;
sad = image->system_area_data;
sai = image->imported_sa_info;
@ -3937,20 +3965,15 @@ int iso_analyze_mbr(IsoImage *image, IsoDataSource *src, int flag)
part->start_block % 4 == 0 && part->block_count % 4 == 0 &&
(part->start_block + part->block_count) / 4 == sai->image_size) {
/* Check for PVD at partition start with same end */
LIBISO_ALLOC_MEM(buf, uint8_t, 2048);
p_offset = part->start_block / 4;
ret = src->read_block(src, p_offset + 16, buf);
if (ret > 0) {
pvm = (struct ecma119_pri_vol_desc *) buf;
if (strncmp((char*) pvm->std_identifier, "CD001", 5) == 0 &&
pvm->vol_desc_type[0] == 1 &&
pvm->vol_desc_version[0] == 1 &&
pvm->file_structure_version[0] == 1 &&
iso_read_lsb(pvm->vol_space_size, 4) + p_offset
== sai->image_size)
sai->partition_offset = p_offset;
}
ret = iso_analyze_partition_offset(image, src, part->start_block,
0);
if (ret < 0)
goto ex;
} else if (is_protective_label && sai->image_size >= 34) {
ret = iso_analyze_partition_offset(image, src, (uint64_t) (16 * 4),
0);
if (ret < 0)
goto ex;
}
}
@ -3962,7 +3985,6 @@ int iso_analyze_mbr(IsoImage *image, IsoDataSource *src, int flag)
(is_grub2_mbr << 14);
ret = 1;
ex:;
LIBISO_FREE_MEM(buf);
return ret;
}