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Adjusted new partition offset feature for multi-session and MD5 tags.

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This commit is contained in:
Thomas Schmitt 2010-09-10 13:45:37 +02:00
parent 08e442a2ab
commit 1d4f26f325
4 changed files with 58 additions and 18 deletions
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3
Makefile.am
View File

@ -81,9 +81,6 @@ libinclude_HEADERS = \
libisofs/libisofs.h
# This is a now obsolete demo filter
# libisofs/filters/xor_encrypt.c
## ========================================================================= ##
## Build demo applications

59
libisofs/ecma119.c
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@ -258,6 +258,12 @@ int ecma119_writer_compute_data_blocks(IsoImageWriter *writer)
target->curblock += DIV_UP(path_table_size, BLOCK_SIZE);
target->path_table_size = path_table_size;
if (target->md5_session_checksum) {
/* Account for first tree checksum tag */
target->checksum_tree_tag_pos = target->curblock;
target->curblock++;
}
if (target->partition_offset > 0) {
/* TWINTREE: take into respect second directory tree */
ndirs = target->ndirs;
@ -274,12 +280,10 @@ int ecma119_writer_compute_data_blocks(IsoImageWriter *writer)
target->curblock += DIV_UP(path_table_size, BLOCK_SIZE);
target->partition_m_table_pos = target->curblock;
target->curblock += DIV_UP(path_table_size, BLOCK_SIZE);
}
if (target->md5_session_checksum) {
/* Account for tree checksum tag */
target->checksum_tree_tag_pos = target->curblock;
target->curblock++;
/* >>> TWINTREE: >>> For now, checksum tags are only for the
image start and not for the partition */;
}
return ISO_SUCCESS;
}
@ -757,9 +761,11 @@ int write_path_tables(Ecma119Image *t)
static
int ecma119_writer_write_dirs(IsoImageWriter *writer)
{
int ret;
int ret, isofs_ca_changed = 0;
Ecma119Image *t;
Ecma119Node *root;
char *value = NULL;
size_t value_length;
t = writer->target;
@ -767,6 +773,24 @@ int ecma119_writer_write_dirs(IsoImageWriter *writer)
/* TWINTREE: t->root -> root */
if (t->eff_partition_offset > 0) {
root = t->partition_root;
if ((t->md5_file_checksums & 1) || t->md5_session_checksum) {
/* Take into respect the address offset in "isofs.ca" */
ret = iso_node_lookup_attr((IsoNode *) t->image->root, "isofs.ca",
&value_length, &value, 0);
if (value != NULL)
free(value);
if (ret == 1 && value_length == 20) {
/* "isofs.ca" does really exist and has the expected length */
ret = iso_root_set_isofsca((IsoNode *) t->image->root,
t->checksum_range_start - t->eff_partition_offset,
t->checksum_array_pos - t->eff_partition_offset,
t->checksum_idx_counter + 2, 16, "MD5", 0);
if (ret < 0)
return ret;
isofs_ca_changed = 1;
}
}
} else {
root = t->root;
}
@ -782,12 +806,21 @@ int ecma119_writer_write_dirs(IsoImageWriter *writer)
if (t->md5_session_checksum) {
/* Write tree checksum tag */
if (t->eff_partition_offset > 0) {
/* >>> TWINTREE: >>> For now, checksums and tags are only for the
first session */;
/* >>> TWINTREE: >>> For now, tags are only for the
image start and not for the partition */;
} else {
ret = iso_md5_write_tag(t, 3);
}
}
if (isofs_ca_changed) {
/* Restore old addresses offset in "isofs.ca" of root node */
ret = iso_root_set_isofsca((IsoNode *) t->image->root,
t->checksum_range_start,
t->checksum_array_pos,
t->checksum_idx_counter + 2, 16, "MD5", 0);
if (ret < 0)
return ret;
}
return ret;
}
@ -875,15 +908,17 @@ static
int pad_writer_compute_data_blocks(IsoImageWriter *writer)
{
Ecma119Image *target;
uint32_t min_size;
if (writer == NULL) {
return ISO_ASSERT_FAILURE;
}
target = writer->target;
if (target->curblock < 32) {
target->pad_blocks = 32 - target->curblock;
target->curblock = 32;
/* TWINTREE: */
min_size = 32 + target->partition_offset;
if (target->curblock < min_size) {
target->pad_blocks = min_size - target->curblock;
target->curblock = min_size;
}
return ISO_SUCCESS;
}

2
libisofs/libisofs.h
View File

@ -1263,7 +1263,7 @@ int iso_write_opts_set_iso1999(IsoWriteOpts *opts, int enable);
* Inode numbers get written as "file serial number" with PX entries as of
* RRIP-1.12. They may mark families of hardlinks.
* RRIP-1.10 prescribes a PX entry without file serial number. If not overriden
* by iso_write_opts_set_rrip_1_10_px_ino() there will be no file serial
* by iso_write_opts_set_rrip_1_10_px_ino() there will be no file serial number
* written into RRIP-1.10 images.
*
* Inode number generation does not affect IsoNode objects which imported their

12
libisofs/system_area.c
View File

@ -147,6 +147,8 @@ int make_grub_msdos_label(uint32_t img_blocks, uint8_t *buf, int flag)
}
/* @param flag bit0= zeroize partitions entries 2, 3, 4
*/
static
int iso_offset_partition_start(uint32_t img_blocks, uint32_t partition_offset,
int sph_in, int hpc_in, uint8_t *buf, int flag)
@ -166,6 +168,9 @@ int iso_offset_partition_start(uint32_t img_blocks, uint32_t partition_offset,
&end_lba, &end_sec, &end_head, &end_cyl, 0);
wpt = buf + 446;
/* Let pass only legal bootability values */
if (*wpt != 0 && *wpt != 0x80)
(*wpt) = 0;
wpt++;
/* C/H/S of the start */
@ -190,12 +195,15 @@ int iso_offset_partition_start(uint32_t img_blocks, uint32_t partition_offset,
for (i = 0; i < 4; i++)
*(wpt++) = (end_lba >> (8 * i)) & 0xff;
/* at 446-462 */
if (wpt - buf != 462) {
fprintf(stderr,
"libisofs: program error in iso_offset_partition_start: \"assert 462\"\n");
return ISO_ASSERT_FAILURE;
}
if (flag & 1) /* zeroize the other partition entries */
memset(wpt, 0, 3 * 16);
return ISO_SUCCESS;
}
@ -265,7 +273,7 @@ int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
img_blocks = t->curblock; /* value might be altered */
ret = iso_offset_partition_start(img_blocks, t->partition_offset,
t->partition_secs_per_head,
t->partition_heads_per_cyl, buf, 0);
t->partition_heads_per_cyl, buf, 1);
if (ret != ISO_SUCCESS) /* error should never happen */
return ISO_ASSERT_FAILURE;
}