194 lines
8.3 KiB
C
194 lines
8.3 KiB
C
/*
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* CBFS Image Manipulation
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*
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* Copyright (C) 2013 The Chromium OS Authors. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __CBFS_IMAGE_H
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#define __CBFS_IMAGE_H
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#include "common.h"
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#include "cbfs.h"
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/* CBFS image processing */
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struct cbfs_image {
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struct buffer buffer;
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/* An image has a header iff it's a legacy CBFS. */
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bool has_header;
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/* Only meaningful if has_header is selected. */
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struct cbfs_header header;
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};
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/* Given the string name of a compression algorithm, return the corresponding
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* enum comp_algo if it's supported, or a number < 0 otherwise. */
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int cbfs_parse_comp_algo(const char *name);
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/* Given the string name of a hash algorithm, return the corresponding
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* id if it's supported, or a number < 0 otherwise. */
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int cbfs_parse_hash_algo(const char *name);
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/* Given a pointer, serialize the header from host-native byte format
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* to cbfs format, i.e. big-endian. */
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void cbfs_put_header(void *dest, const struct cbfs_header *header);
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/* Or deserialize into host-native format */
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void cbfs_get_header(struct cbfs_header *header, void *src);
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/* Populates a CBFS with a single empty entry filling all available space
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* (entries_size bytes). If image's header field is already present, its
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* contents will be used to place an empty entry of the requested length at the
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* appropriate position in the existing buffer; otherwise, if not has_header,
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* the first entries_size bytes of buffer will be filled exclusively with the
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* single empty entry (and no CBFS master header).
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* Returns 0 on success, otherwise nonzero. */
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int cbfs_image_create(struct cbfs_image *image, size_t entries_size);
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/* Creates an empty CBFS image by given size, and description to its content
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* (bootblock, align, header location, starting offset of CBFS entries).
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* The output image will contain a valid cbfs_header, with one cbfs_file
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* entry with type CBFS_COMPONENT_NULL, with max available size.
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* Only call this if you want a legacy CBFS with a master header.
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* Returns 0 on success, otherwise nonzero. */
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int cbfs_legacy_image_create(struct cbfs_image *image,
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uint32_t arch,
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uint32_t align,
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struct buffer *bootblock,
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uint32_t bootblock_offset,
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uint32_t header_offset,
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uint32_t entries_offset);
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/* Constructs a cbfs_image from a buffer. The resulting image contains a shallow
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* copy of the buffer; releasing either one is the legal way to clean up after
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* both of them at once. Always produces a cbfs_image, but...
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* Returns 0 if it contains a valid CBFS, non-zero if it's unrecognized data. */
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int cbfs_image_from_buffer(struct cbfs_image *out, struct buffer *in,
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uint32_t offset);
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/* Create a duplicate CBFS image. Returns 0 on success, otherwise non-zero.
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* Will not succeed on new-style images without a master header. */
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int cbfs_copy_instance(struct cbfs_image *image, size_t copy_offset,
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size_t copy_size);
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/* Releases the CBFS image. Returns 0 on success, otherwise non-zero. */
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int cbfs_image_delete(struct cbfs_image *image);
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/* Returns a pointer to entry by name, or NULL if name is not found. */
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struct cbfs_file *cbfs_get_entry(struct cbfs_image *image, const char *name);
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/* Exports an entry to external file.
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* Returns 0 on success, otherwise (ex, not found) non-zero. */
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int cbfs_export_entry(struct cbfs_image *image, const char *entry_name,
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const char *filename, uint32_t arch);
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/* Adds an entry to CBFS image by given name and type. If content_offset is
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* non-zero, try to align "content" (CBFS_SUBHEADER(p)) at content_offset.
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* Never pass this function a top-aligned address: convert it to an offset.
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* Returns 0 on success, otherwise non-zero. */
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int cbfs_add_entry(struct cbfs_image *image, struct buffer *buffer,
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uint32_t content_offset, struct cbfs_file *header);
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/* Removes an entry from CBFS image. Returns 0 on success, otherwise non-zero. */
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int cbfs_remove_entry(struct cbfs_image *image, const char *name);
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/* Create a new cbfs file header structure to work with.
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Returns newly allocated memory that the caller needs to free after use. */
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struct cbfs_file *cbfs_create_file_header(int type, size_t len,
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const char *name);
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/* Initializes a new empty (type = NULL) entry with size and name in CBFS image.
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* Returns 0 on success, otherwise (ex, not found) non-zero. */
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int cbfs_create_empty_entry(struct cbfs_file *entry, int type,
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size_t len, const char *name);
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/* Finds a location to put given content by specified criteria:
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* "page_size" limits the content to fit on same memory page, and
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* "align" specifies starting address alignment.
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* Returns a valid offset, or -1 on failure. */
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int32_t cbfs_locate_entry(struct cbfs_image *image, size_t size,
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size_t page_size, size_t align, size_t metadata_size);
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/* Callback function used by cbfs_walk.
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* Returns 0 on success, or non-zero to stop further iteration. */
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typedef int (*cbfs_entry_callback)(struct cbfs_image *image,
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struct cbfs_file *file,
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void *arg);
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/* Iterates through all entries in CBFS image, and invoke with callback.
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* Stops if callback returns non-zero values.
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* Returns number of entries invoked. */
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int cbfs_walk(struct cbfs_image *image, cbfs_entry_callback callback, void *arg);
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/* Primitive CBFS utilities */
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/* Returns a pointer to the only valid CBFS header in give buffer, otherwise
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* NULL (including when multiple headers were found). If there is a X86 ROM
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* style signature (pointer at 0xfffffffc) found in ROM, it will be selected as
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* the only header.*/
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struct cbfs_header *cbfs_find_header(char *data, size_t size,
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uint32_t forced_offset);
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/* Returns the first cbfs_file entry in CBFS image by CBFS header (no matter if
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* the entry has valid content or not), otherwise NULL. */
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struct cbfs_file *cbfs_find_first_entry(struct cbfs_image *image);
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/* Returns next cbfs_file entry (no matter if its content is valid or not), or
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* NULL on failure. */
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struct cbfs_file *cbfs_find_next_entry(struct cbfs_image *image,
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struct cbfs_file *entry);
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/* Returns ROM address (offset) of entry.
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* This is different from entry->offset (pointer to content). */
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uint32_t cbfs_get_entry_addr(struct cbfs_image *image, struct cbfs_file *entry);
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/* Returns 1 if valid new-format CBFS (without a master header), otherwise 0. */
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int cbfs_is_valid_cbfs(struct cbfs_image *image);
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/* Returns 1 if valid legacy CBFS (with a master header), otherwise 0. */
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int cbfs_is_legacy_cbfs(struct cbfs_image *image);
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/* Returns 1 if entry has valid data (by checking magic number), otherwise 0. */
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int cbfs_is_valid_entry(struct cbfs_image *image, struct cbfs_file *entry);
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/* Print CBFS component information. */
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int cbfs_print_directory(struct cbfs_image *image);
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int cbfs_print_header_info(struct cbfs_image *image);
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int cbfs_print_entry_info(struct cbfs_image *image, struct cbfs_file *entry,
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void *arg);
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/* Merge empty entries starting from given entry.
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* Returns 0 on success, otherwise non-zero. */
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int cbfs_merge_empty_entry(struct cbfs_image *image, struct cbfs_file *entry,
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void *arg);
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/* Returns the size of a cbfs file header with no extensions */
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size_t cbfs_calculate_file_header_size(const char *name);
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/* Given a cbfs_file, return the first file attribute, or NULL. */
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struct cbfs_file_attribute *cbfs_file_first_attr(struct cbfs_file *file);
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/* Given a cbfs_file and a cbfs_file_attribute, return the attribute that
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* follows it, or NULL. */
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struct cbfs_file_attribute *cbfs_file_next_attr(struct cbfs_file *file,
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struct cbfs_file_attribute *attr);
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/* Adds to header a new extended attribute tagged 'tag', sized 'size'.
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* Returns pointer to the new attribute, or NULL on error. */
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struct cbfs_file_attribute *cbfs_add_file_attr(struct cbfs_file *header,
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uint32_t tag,
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uint32_t size);
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/* Adds an extended attribute to header, containing a hash of buffer's data of
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* the type specified by hash_type.
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* Returns 0 on success, -1 on error. */
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int cbfs_add_file_hash(struct cbfs_file *header, struct buffer *buffer,
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enum vb2_hash_algorithm hash_type);
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#endif
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