diff options
Diffstat (limited to 'src/commonlib/bsd/cbfs_private.c')
-rw-r--r-- | src/commonlib/bsd/cbfs_private.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/commonlib/bsd/cbfs_private.c b/src/commonlib/bsd/cbfs_private.c index 035684b91e..7814c4a727 100644 --- a/src/commonlib/bsd/cbfs_private.c +++ b/src/commonlib/bsd/cbfs_private.c @@ -159,3 +159,35 @@ cb_err_t cbfs_lookup(cbfs_dev_t dev, const char *name, union cbfs_mdata *mdata_o }; return cbfs_walk(dev, lookup_walker, &args, metadata_hash, 0); } + +const void *cbfs_find_attr(const union cbfs_mdata *mdata, uint32_t attr_tag, size_t size_check) +{ + uint32_t offset = be32toh(mdata->h.attributes_offset); + uint32_t end = be32toh(mdata->h.offset); + + if (!offset) + return NULL; + + while (offset + sizeof(struct cbfs_file_attribute) <= end) { + const struct cbfs_file_attribute *attr = (const void *)mdata->raw + offset; + const uint32_t tag = be32toh(attr->tag); + const uint32_t len = be32toh(attr->len); + + if (offset + len > end) { + ERROR("Attribute %s[%u] overflows end of metadata\n", + mdata->filename, tag); + return NULL; + } + if (tag == attr_tag) { + if (size_check && len != size_check) { + ERROR("Attribute %s[%u] size mismatch: %u != %zu\n", + mdata->filename, tag, len, size_check); + return NULL; + } + return attr; + } + offset += len; + } + + return NULL; +} |