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cbfstool: add extended file attributes for cbfs_file

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cbfs_file_first_attr(struct cbfs_file *) and
cbfs_file_next_attr(struct cbfs_file *, struct cbfs_file_attribute *)
help navigate through extended attributes.

cbfs_add_file_attr(header, tag, size) adds a new file attribute to
header.

Change-Id: I325965286c44f31abd95df684d340cebb0e68b75
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10934
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Patrick Georgi
2015-07-15 20:49:00 +02:00
committed by Patrick Georgi
parent 4a666423c6
commit 2c61506630
3 changed files with 107 additions and 5 deletions
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87
util/cbfstool/cbfs_image.c
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@@ -997,11 +997,8 @@ int cbfs_is_valid_entry(struct cbfs_image *image, struct cbfs_file *entry)
struct cbfs_file *cbfs_create_file_header(int type,
size_t len, const char *name)
{
// assume that there won't be file names of ~1000 bytes
const int bufsize = 1024;
struct cbfs_file *entry = malloc(bufsize);
memset(entry, CBFS_CONTENT_DEFAULT_VALUE, bufsize);
struct cbfs_file *entry = malloc(MAX_CBFS_FILE_HEADER_BUFFER);
memset(entry, CBFS_CONTENT_DEFAULT_VALUE, MAX_CBFS_FILE_HEADER_BUFFER);
memcpy(entry->magic, CBFS_FILE_MAGIC, sizeof(entry->magic));
entry->type = htonl(type);
entry->len = htonl(len);
@@ -1022,6 +1019,86 @@ int cbfs_create_empty_entry(struct cbfs_file *entry, int type,
return 0;
}
struct cbfs_file_attribute *cbfs_file_first_attr(struct cbfs_file *file)
{
/* attributes_offset should be 0 when there is no attribute, but all
* values that point into the cbfs_file header are invalid, too. */
if (ntohl(file->attributes_offset) <= sizeof(*file))
return NULL;
/* There needs to be enough space for the file header and one
* attribute header for this to make sense. */
if (ntohl(file->offset) <=
sizeof(*file) + sizeof(struct cbfs_file_attribute))
return NULL;
return (struct cbfs_file_attribute *)
(((uint8_t *)file) + ntohl(file->attributes_offset));
}
struct cbfs_file_attribute *cbfs_file_next_attr(struct cbfs_file *file,
struct cbfs_file_attribute *attr)
{
/* ex falso sequitur quodlibet */
if (attr == NULL)
return NULL;
/* Is there enough space for another attribute? */
if ((uint8_t *)attr + ntohl(attr->len) +
sizeof(struct cbfs_file_attribute) >=
(uint8_t *)file + ntohl(file->offset))
return NULL;
struct cbfs_file_attribute *next = (struct cbfs_file_attribute *)
(((uint8_t *)attr) + ntohl(attr->len));
/* If any, "unused" attributes must come last. */
if (ntohl(next->tag) == CBFS_FILE_ATTR_TAG_UNUSED)
return NULL;
if (ntohl(next->tag) == CBFS_FILE_ATTR_TAG_UNUSED2)
return NULL;
return next;
}
struct cbfs_file_attribute *cbfs_add_file_attr(struct cbfs_file *header,
uint32_t tag,
uint32_t size)
{
struct cbfs_file_attribute *attr, *next;
next = cbfs_file_first_attr(header);
do {
attr = next;
next = cbfs_file_next_attr(header, attr);
} while (next != NULL);
uint32_t header_size = ntohl(header->offset) + size;
if (header_size > MAX_CBFS_FILE_HEADER_BUFFER) {
DEBUG("exceeding allocated space for cbfs_file headers");
return NULL;
}
/* attr points to the last valid attribute now.
* If NULL, we have to create the first one. */
if (attr == NULL) {
/* New attributes start where the header ends.
* header->offset is later set to accomodate the
* additional structure.
* No endianess translation necessary here, because both
* fields are encoded the same way. */
header->attributes_offset = header->offset;
attr = (struct cbfs_file_attribute *)
(((uint8_t *)header) +
ntohl(header->attributes_offset));
} else {
attr = (struct cbfs_file_attribute *)
(((uint8_t *)attr) +
ntohl(attr->len));
}
header->offset = htonl(header_size);
memset(attr, CBFS_CONTENT_DEFAULT_VALUE, size);
attr->tag = htonl(tag);
attr->len = htonl(size);
return attr;
}
/* Finds a place to hold whole data in same memory page. */
static int is_in_same_page(uint32_t start, uint32_t size, uint32_t page)
{