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100 lines
3.1 KiB
100 lines
3.1 KiB
4 months ago
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/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Host-side misc functions for verified boot.
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*/
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#ifndef VBOOT_REFERENCE_HOST_MISC_H_
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#define VBOOT_REFERENCE_HOST_MISC_H_
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#include "utility.h"
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#include "vboot_struct.h"
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/* Copy up to dest_size-1 characters from src to dest, ensuring null
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termination (which strncpy() doesn't do). Returns the destination
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string. */
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char* StrCopy(char* dest, const char* src, int dest_size);
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/* Read data from [filename]. Store the size of returned data in [size].
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*
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* Returns the data buffer, which the caller must Free(), or NULL if
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* error. */
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uint8_t* ReadFile(const char* filename, uint64_t* size);
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/* Read a string from a file. Passed the destination, dest size, and
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* filename to read.
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*
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* Returns the destination, or NULL if error. */
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char* ReadFileString(char* dest, int size, const char* filename);
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/* Read an unsigned integer from a file and save into passed pointer.
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*
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* Returns 0 if success, -1 if error. */
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int ReadFileInt(const char* filename, unsigned* value);
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/* Check if a bit is set in a file which contains an integer.
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*
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* Returns 1 if the bit is set, 0 if clear, or -1 if error. */
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int ReadFileBit(const char* filename, int bitmask);
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/* Writes [size] bytes of [data] to [filename].
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*
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* Returns 0 if success, 1 if error. */
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int WriteFile(const char* filename, const void *data, uint64_t size);
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/**
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* Read data from a file into a newly allocated buffer.
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*
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* @param filename Name of file to read from
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* @param data_ptr On exit, pointer to newly allocated buffer with data
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* will be stored here. Caller must free() the buffer
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* when done with it.
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* @param size_ptr On exit, size of data will be stored here.
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* @return VB2_SUCCESS, or non-zero if error.
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*/
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int vb2_read_file(const char *filename, uint8_t **data_ptr, uint32_t *size_ptr);
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/**
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* Write data to a file from a buffer.
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*
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* @param filename Name of file to write to
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* @param buf Buffer to write
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* @param size Number of bytes of data to write
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* @return VB2_SUCCESS, or non-zero if error.
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*/
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int vb2_write_file(const char *filename, const void *buf, uint32_t size);
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/**
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* Write a buffer which starts with a standard vb2_struct_common header.
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*
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* Determines the buffer size from the common header total size field.
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*
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* @param filename Name of file to write to
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* @param buf Buffer to write
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* @return VB2_SUCCESS, or non-zero if error.
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*/
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int vb2_write_object(const char *filename, const void *buf);
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/**
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* Round up a size to a multiple of 32 bits (4 bytes).
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*/
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static __inline const uint32_t roundup32(uint32_t v)
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{
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return (v + 3) & ~3;
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}
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/**
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* Return the buffer size required to hold a description string.
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*
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* If the string is NULL or empty, the size is zero. Otherwise, it is the
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* size of a buffer which can hold the string and its null terminator,
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* rounded up to the nerest multiple of 32 bits.
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*
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* @param desc Description string
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* @return The buffer size in bytes.
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*/
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uint32_t vb2_desc_size(const char *desc);
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#endif /* VBOOT_REFERENCE_HOST_MISC_H_ */
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