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54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* 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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/* Helper functions/wrappers for memory allocations, manipulation and
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* comparison.
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*/
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#ifndef VBOOT_REFERENCE_UTILITY_H_
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#define VBOOT_REFERENCE_UTILITY_H_
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#include <inttypes.h>
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#include <string.h>
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/* Allocate [size] bytes and return a pointer to the allocated memory. Abort
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* on error.
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*/
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void* Malloc(size_t size);
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/* Free memory pointed by [ptr] previously allocated by Malloc(). */
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void Free(void* ptr);
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/* Copy [n] bytes from [src] to [dest]. */
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void* Memcpy(void* dest, const void* src, size_t n);
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/* Set [n] bytes starting at [s] to [c]. */
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void* Memset(void *dest, const uint8_t c, size_t n);
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/* Compare [n] bytes starting at [s1] with [s2] and return 1 if they match,
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* 0 if they don't. Time taken to perform the comparison is only dependent on
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* [n] and not on the relationship of the match between [s1] and [s2].
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*/
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int SafeMemcmp(const void* s1, const void* s2, size_t n);
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/* Track remaining data to be read in a buffer. */
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typedef struct MemcpyState {
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void* remaining_buf;
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int remaining_len;
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} MemcpyState;
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/* Copy [len] bytes into [dst] only if there's enough data to read according
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* to [state].
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* On success, return [dst] and update [state]..
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* On failure, return NULL, set remaining len in state to -1.
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*
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* Useful for iterating through a binary blob to populate a struct. After the
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* first failure (buffer overrun), successive calls will always fail.
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*/
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void* StatefulMemcpy(MemcpyState* state, void* dst, int len);
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#endif /* VBOOT_REFERENCE_UTILITY_H_ */
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