mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
88 lines
3 KiB
C
88 lines
3 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/*
|
|
* Copyright (C) 2016 The Android Open Source Project
|
|
*/
|
|
|
|
#if !defined(AVB_INSIDE_LIBAVB_H) && !defined(AVB_COMPILATION)
|
|
#error "Never include this file directly, include libavb.h instead."
|
|
#endif
|
|
|
|
#ifndef AVB_PROPERTY_DESCRIPTOR_H_
|
|
#define AVB_PROPERTY_DESCRIPTOR_H_
|
|
|
|
#include "avb_descriptor.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* A descriptor for properties (free-form key/value pairs).
|
|
*
|
|
* Following this struct are |key_num_bytes| bytes of key data,
|
|
* followed by a NUL byte, then |value_num_bytes| bytes of value data,
|
|
* followed by a NUL byte and then enough padding to make the combined
|
|
* size a multiple of 8.
|
|
*/
|
|
typedef struct AvbPropertyDescriptor {
|
|
AvbDescriptor parent_descriptor;
|
|
uint64_t key_num_bytes;
|
|
uint64_t value_num_bytes;
|
|
} AVB_ATTR_PACKED AvbPropertyDescriptor;
|
|
|
|
/* Copies |src| to |dest| and validates, byte-swapping fields in the
|
|
* process if needed. Returns true if valid, false if invalid.
|
|
*
|
|
* Data following the struct is not validated nor copied.
|
|
*/
|
|
bool avb_property_descriptor_validate_and_byteswap(
|
|
const AvbPropertyDescriptor* src,
|
|
AvbPropertyDescriptor* dest) AVB_ATTR_WARN_UNUSED_RESULT;
|
|
|
|
/* Convenience function for looking up the value for a property with
|
|
* name |key| in a vbmeta image. If |key_size| is 0, |key| must be
|
|
* NUL-terminated.
|
|
*
|
|
* The |image_data| parameter must be a pointer to a vbmeta image of
|
|
* size |image_size|.
|
|
*
|
|
* This function returns a pointer to the value inside the passed-in
|
|
* image or NULL if not found. Note that the value is always
|
|
* guaranteed to be followed by a NUL byte.
|
|
*
|
|
* If the value was found and |out_value_size| is not NULL, the size
|
|
* of the value is returned there.
|
|
*
|
|
* This function is O(n) in number of descriptors so if you need to
|
|
* look up a lot of values, you may want to build a more efficient
|
|
* lookup-table by manually walking all descriptors using
|
|
* avb_descriptor_foreach().
|
|
*
|
|
* Before using this function, you MUST verify |image_data| with
|
|
* avb_vbmeta_image_verify() and reject it unless it's signed by a
|
|
* known good public key.
|
|
*/
|
|
const char* avb_property_lookup(const uint8_t* image_data,
|
|
size_t image_size,
|
|
const char* key,
|
|
size_t key_size,
|
|
size_t* out_value_size)
|
|
AVB_ATTR_WARN_UNUSED_RESULT;
|
|
|
|
/* Like avb_property_lookup() but parses the intial portions of the
|
|
* value as an unsigned 64-bit integer. Both decimal and hexadecimal
|
|
* representations (e.g. "0x2a") are supported. Returns false on
|
|
* failure and true on success. On success, the parsed value is
|
|
* returned in |out_value|.
|
|
*/
|
|
bool avb_property_lookup_uint64(const uint8_t* image_data,
|
|
size_t image_size,
|
|
const char* key,
|
|
size_t key_size,
|
|
uint64_t* out_value)
|
|
AVB_ATTR_WARN_UNUSED_RESULT;
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* AVB_PROPERTY_DESCRIPTOR_H_ */
|