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New API calls el_torito_set_id_string(), el_torito_get_id_string(),

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el_torito_set_selection_crit(), el_torito_get_selection_crit().
This commit is contained in:
Thomas Schmitt
2010-04-23 18:01:27 +02:00
parent ace0d1ab2e
commit 02d7a690eb
4 changed files with 157 additions and 20 deletions
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91
libisofs/eltorito.c
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@@ -123,6 +123,36 @@ int el_torito_get_bootable(ElToritoBootImage *bootimg)
return !!bootimg->bootable;
}
/* API */
int el_torito_set_id_string(ElToritoBootImage *bootimg, uint8_t id_string[28])
{
memcpy(bootimg->id_string, id_string, 28);
return 1;
}
/* API */
int el_torito_get_id_string(ElToritoBootImage *bootimg, uint8_t id_string[28])
{
memcpy(id_string, bootimg->id_string, 28);
return 1;
}
/* API */
int el_torito_set_selection_crit(ElToritoBootImage *bootimg, uint8_t crit[20])
{
memcpy(bootimg->selection_crit, crit, 20);
return 1;
}
/* API */
int el_torito_get_selection_crit(ElToritoBootImage *bootimg, uint8_t crit[20])
{
memcpy(crit, bootimg->selection_crit, 20);
return 1;
}
/**
* Specifies that this image needs to be patched. This involves the writting
* of a 56 bytes boot information table at offset 8 of the boot image file.
@@ -376,7 +406,8 @@ int create_image(IsoImage *image, const char *image_path,
boot->load_seg = 0;
boot->load_size = load_sectors;
boot->platform_id = 0; /* 80x86 */
memset(boot->id_string, 0, sizeof(boot->id_string));
memset(boot->selection_crit, 0, sizeof(boot->selection_crit));
if (bootimg) {
*bootimg = boot;
}
@@ -656,7 +687,8 @@ struct catalog_stream
};
static void
write_validation_entry(uint8_t *buf, uint8_t platform_id)
write_validation_entry(uint8_t *buf, uint8_t platform_id,
uint8_t id_string[24])
{
size_t i;
int checksum;
@@ -665,9 +697,9 @@ write_validation_entry(uint8_t *buf, uint8_t platform_id)
(struct el_torito_validation_entry*)buf;
ve->header_id[0] = 1;
ve->platform_id[0] = platform_id;
memcpy(ve->id_string, id_string, sizeof(ve->id_string));
ve->key_byte1[0] = 0x55;
ve->key_byte2[0] = 0xAA;
/* calculate the checksum, to ensure sum of all words is 0 */
checksum = 0;
for (i = 0; i < sizeof(struct el_torito_validation_entry); i += 2) {
@@ -677,7 +709,8 @@ write_validation_entry(uint8_t *buf, uint8_t platform_id)
}
static void
write_section_header(uint8_t *buf, Ecma119Image *t, int idx) {
write_section_header(uint8_t *buf, Ecma119Image *t, int idx, int num_entries)
{
int pi;
char *id_string;
@@ -687,17 +720,11 @@ write_section_header(uint8_t *buf, Ecma119Image *t, int idx) {
/* 0x90 = more section headers follow , 0x91 = final section */
e->header_indicator[0] = 0x90 + (idx == t->catalog->num_bootimages - 1);
pi= e->platform_id[0] = t->catalog->bootimages[idx]->platform_id;
e->num_entries[0] = 1;
e->num_entries[1] = 0;
e->num_entries[0] = num_entries & 0xff;
e->num_entries[1] = (num_entries >> 8) & 0xff;;
id_string = (char *) e->id_string;
memset(id_string, 0, sizeof(e->id_string));
/* >>> ???
El-Torito 1.0 , chapter 2.3 :
"If the BIOS understands the ID, string it may choose to boot
the system using one of these entries ..."
*/
memcpy(id_string, t->catalog->bootimages[idx]->id_string,
sizeof(e->id_string));
}
/**
@@ -720,18 +747,25 @@ write_section_entry(uint8_t *buf, Ecma119Image *t, int idx)
se->system_type[0] = img->partition_type;
iso_lsb(se->sec_count, img->load_size, 2);
iso_lsb(se->block, t->bootsrc[idx]->sections[0].block, 4);
se->selec_criteria[0] = img->selection_crit[0];
memcpy(se->vendor_sc, img->selection_crit + 1, 19);
}
static
int catalog_open(IsoStream *stream)
{
int i;
int i, j, k, num_entries;
struct catalog_stream *data;
uint8_t *wpt;
struct el_torito_boot_catalog *cat;
struct el_torito_boot_image **boots;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
data = stream->data;
cat = data->target->catalog;
boots = cat->bootimages;
if (data->offset != -1) {
return ISO_FILE_ALREADY_OPENED;
@@ -741,16 +775,35 @@ int catalog_open(IsoStream *stream)
/* fill the buffer with the catalog contents */
write_validation_entry(data->buffer,
data->target->catalog->bootimages[0]->platform_id);
boots[0]->platform_id, boots[0]->id_string);
/* write default entry = first boot image */
write_section_entry(data->buffer + 32, data->target, 0);
/* ts B00420 */
/* (The maximum number of boot images must fit into BLOCK_SIZE) */
for (i = 1; i < data->target->catalog->num_bootimages; i++) {
write_section_header(data->buffer + i * 64, data->target, i);
write_section_entry(data->buffer + i * 64 + 32, data->target, i);
wpt = data->buffer + 64;
for (i = 1; i < cat->num_bootimages; ) {
/* Look ahead and put images of same platform_id and id_string
into the same section */
for (j = i + 1; j < cat->num_bootimages; j++) {
if (boots[i]->platform_id != boots[j]->platform_id)
break;
for (k = 0; k < sizeof(boots[i]->selection_crit); k++)
if (boots[i]->selection_crit[k] != boots[j]->selection_crit[k])
break;
if (k < sizeof(boots[i]->selection_crit))
break;
}
num_entries = j - i;
write_section_header(wpt, data->target, i, num_entries);
wpt += 32;
for (j = 0; j < num_entries; j++) {
write_section_entry(wpt, data->target, i);
wpt += 32;
i++;
}
}
data->offset = 0;
return ISO_SUCCESS;