diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/include/cbfs_core.h | 7 | ||||
| -rw-r--r-- | src/lib/cbfs_core.c | 88 |
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, |