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-rw-r--r--src/include/cbfs_core.h7
-rw-r--r--src/lib/cbfs_core.c88
2 files changed, 66 insertions, 29 deletions
diff --git a/src/include/cbfs_core.h b/src/include/cbfs_core.h
index e74d618d92..3cef9031ab 100644
--- a/src/include/cbfs_core.h
+++ b/src/include/cbfs_core.h
@@ -217,6 +217,13 @@ struct cbfs_media {
int (*close)(struct cbfs_media *media);
};
+/*
+ * Locate file by name and fill in cbfs_file in host byte order. Returns
+ * < 0 on error, else the offset of the file data.
+ */
+ssize_t cbfs_locate_file(struct cbfs_media *media, struct cbfs_file *file,
+ const char *name);
+
/* returns pointer to a file entry inside CBFS or NULL */
struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name);
diff --git a/src/lib/cbfs_core.c b/src/lib/cbfs_core.c
index 0f97755314..24e5998f71 100644
--- a/src/lib/cbfs_core.c
+++ b/src/lib/cbfs_core.c
@@ -93,25 +93,33 @@ const struct cbfs_header *cbfs_get_header(struct cbfs_media *media)
return header;
}
+
+static int init_media(struct cbfs_media **media, struct cbfs_media *backing)
+{
+ if (*media == CBFS_DEFAULT_MEDIA) {
+ *media = backing;
+ if (init_default_cbfs_media(*media) != 0) {
+ ERROR("Failed to initialize default media.\n");
+ return -1;
+ }
+ }
+ return 0;
+}
+
/* public API starts here*/
-struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
+ssize_t cbfs_locate_file(struct cbfs_media *media, struct cbfs_file *file,
+ const char *name)
{
const char *file_name;
uint32_t offset, align, romsize, name_len;
const struct cbfs_header *header;
- struct cbfs_file file, *file_ptr;
struct cbfs_media default_media;
- if (media == CBFS_DEFAULT_MEDIA) {
- media = &default_media;
- if (init_default_cbfs_media(media) != 0) {
- ERROR("Failed to initialize default media.\n");
- return NULL;
- }
- }
+ if (init_media(&media, &default_media))
+ return -1;
if (CBFS_HEADER_INVALID_ADDRESS == (header = cbfs_get_header(media)))
- return NULL;
+ return -1;
// Logical offset (for source media) of first file.
offset = ntohl(header->offset);
@@ -139,9 +147,9 @@ struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
media->open(media);
while (offset < romsize &&
- media->read(media, &file, offset, sizeof(file)) == sizeof(file)) {
- if (memcmp(CBFS_FILE_MAGIC, file.magic,
- sizeof(file.magic)) != 0) {
+ media->read(media, file, offset, sizeof(*file)) == sizeof(*file)) {
+ if (memcmp(CBFS_FILE_MAGIC, file->magic,
+ sizeof(file->magic)) != 0) {
uint32_t new_align = align;
if (offset % align)
new_align += align - (offset % align);
@@ -151,30 +159,25 @@ struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
offset += new_align;
continue;
}
- name_len = ntohl(file.offset) - sizeof(file);
+
+ file->len = ntohl(file->len);
+ file->type= ntohl(file->type);
+ file->offset = ntohl(file->offset);
+
+ name_len = file->offset - sizeof(*file);
DEBUG(" - load entry 0x%x file name (%d bytes)...\n", offset,
name_len);
// load file name (arbitrary length).
file_name = (const char *)media->map(
- media, offset + sizeof(file), name_len);
+ media, offset + sizeof(*file), name_len);
if (file_name == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
ERROR("ERROR: Failed to get filename: 0x%x.\n", offset);
} else if (strcmp(file_name, name) == 0) {
- int file_offset = ntohl(file.offset),
- file_len = ntohl(file.len);
DEBUG("Found file (offset=0x%x, len=%d).\n",
- offset + file_offset, file_len);
+ offset + file->offset, file->len);
media->unmap(media, file_name);
- file_ptr = media->map(media, offset,
- file_offset + file_len);
- media->close(media);
- if (file_ptr == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
- ERROR("ERROR: Mapping %s failed (insufficient "
- "buffer space?).\n", file_name);
- return NULL;
- }
- return file_ptr;
+ return offset + file->offset;
} else {
DEBUG(" (unmatched file @0x%x: %s)\n", offset,
file_name);
@@ -182,13 +185,40 @@ struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
}
// Move to next file.
- offset += ntohl(file.len) + ntohl(file.offset);
+ offset += file->len + file->offset;
if (offset % align)
offset += align - (offset % align);
}
media->close(media);
LOG("WARNING: '%s' not found.\n", name);
- return NULL;
+ return -1;
+}
+
+struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
+{
+ struct cbfs_media default_media;
+ struct cbfs_file file, *file_ptr;
+ ssize_t offset;
+
+ if (init_media(&media, &default_media))
+ return NULL;
+
+ offset = cbfs_locate_file(media, &file, name);
+ if (offset < 0)
+ return NULL;
+
+ /* Map both the metadata and the file contents. */
+ media->open(media);
+ offset -= file.offset;
+ file_ptr = media->map(media, offset, file.offset + file.len);
+ media->close(media);
+
+ if (file_ptr == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
+ ERROR("ERROR: Mapping %s failed.\n", name);
+ return NULL;
+ }
+
+ return file_ptr;
}
void *cbfs_get_file_content(struct cbfs_media *media, const char *name,