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cbfs: Support reading compression information

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CBFS now supports compressed filed. Add support for reading this
information so that the correct decompression can be applied. The
decompression itself is not implemented in CBFS.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-03-15 18:00:16 +13:00
parent 0e2fee52d0
commit a202f17d7b
2 changed files with 33 additions and 0 deletions
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22
fs/cbfs/cbfs.c
View file

@ -91,6 +91,7 @@ static int fill_node(struct cbfs_cachenode *node, void *start,
struct cbfs_fileheader *header)
{
uint name_len;
uint offset;
/* Check the header is large enough */
if (header->offset < sizeof(struct cbfs_fileheader))
@ -104,6 +105,27 @@ static int fill_node(struct cbfs_cachenode *node, void *start,
node->name = start + sizeof(struct cbfs_fileheader);
node->name_length = name_len;
node->attr_offset = header->attributes_offset;
node->comp_algo = CBFS_COMPRESS_NONE;
node->decomp_size = 0;
for (offset = node->attr_offset; offset < header->offset;) {
const struct cbfs_file_attribute *attr;
uint tag, len;
attr = start + offset;
tag = be32_to_cpu(attr->tag);
len = be32_to_cpu(attr->len);
if (tag == CBFS_FILE_ATTR_TAG_COMPRESSION) {
struct cbfs_file_attr_compression *comp;
comp = start + offset;
node->comp_algo = be32_to_cpu(comp->compression);
node->decomp_size =
be32_to_cpu(comp->decompressed_size);
}
offset += len;
}
return 0;
}

11
include/cbfs.h
View file

@ -75,6 +75,15 @@ struct cbfs_fileheader {
char filename[];
} __packed;
/**
* These are standard values for the known compression alogrithms that coreboot
* knows about for stages and payloads. Of course, other CBFS users can use
* whatever values they want, as long as they understand them.
*/
#define CBFS_COMPRESS_NONE 0
#define CBFS_COMPRESS_LZMA 1
#define CBFS_COMPRESS_LZ4 2
/*
* Depending on how the header was initialized, it may be backed with 0x00 or
* 0xff, so support both
@ -119,6 +128,8 @@ struct cbfs_cachenode {
u32 data_length;
u32 name_length;
u32 attr_offset;
u32 comp_algo;
u32 decomp_size;
};
/**