269 lines
8.9 KiB
C
269 lines
8.9 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*/
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#if !defined(AVB_INSIDE_LIBAVB_H) && !defined(AVB_COMPILATION)
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#error "Never include this file directly, include libavb.h instead."
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#endif
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#ifndef AVB_UTIL_H_
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#define AVB_UTIL_H_
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#include "avb_sysdeps.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define AVB_STRINGIFY(x) #x
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#define AVB_TO_STRING(x) AVB_STRINGIFY(x)
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#ifdef AVB_ENABLE_DEBUG
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/* Aborts the program if |expr| is false.
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*
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* This has no effect unless AVB_ENABLE_DEBUG is defined.
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*/
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#define avb_assert(expr) \
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do { \
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if (!(expr)) { \
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avb_fatal("assert fail: " #expr "\n"); \
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} \
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} while (0)
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#else
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#define avb_assert(expr)
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#endif
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/* Aborts the program if reached.
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*
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* This has no effect unless AVB_ENABLE_DEBUG is defined.
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*/
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#ifdef AVB_ENABLE_DEBUG
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#define avb_assert_not_reached() \
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do { \
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avb_fatal("assert_not_reached()\n"); \
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} while (0)
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#else
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#define avb_assert_not_reached()
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#endif
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/* Aborts the program if |addr| is not word-aligned.
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*
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* This has no effect unless AVB_ENABLE_DEBUG is defined.
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*/
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#define avb_assert_aligned(addr) \
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avb_assert((((uintptr_t)addr) & (AVB_ALIGNMENT_SIZE - 1)) == 0)
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#ifdef AVB_ENABLE_DEBUG
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/* Print functions, used for diagnostics.
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*
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* These have no effect unless AVB_ENABLE_DEBUG is defined.
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*/
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#define avb_debug(message) \
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do { \
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avb_printv(avb_basename(__FILE__), \
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":", \
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AVB_TO_STRING(__LINE__), \
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": DEBUG: ", \
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message, \
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NULL); \
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} while (0)
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#define avb_debugv(message, ...) \
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do { \
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avb_printv(avb_basename(__FILE__), \
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":", \
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AVB_TO_STRING(__LINE__), \
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": DEBUG: ", \
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message, \
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##__VA_ARGS__); \
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} while (0)
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#else
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#define avb_debug(message)
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#define avb_debugv(message, ...)
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#endif
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/* Prints out a message. This is typically used if a runtime-error
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* occurs.
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*/
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#define avb_error(message) \
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do { \
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avb_printv(avb_basename(__FILE__), \
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":", \
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AVB_TO_STRING(__LINE__), \
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": ERROR: ", \
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message, \
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NULL); \
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} while (0)
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#define avb_errorv(message, ...) \
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do { \
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avb_printv(avb_basename(__FILE__), \
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":", \
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AVB_TO_STRING(__LINE__), \
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": ERROR: ", \
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message, \
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##__VA_ARGS__); \
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} while (0)
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/* Prints out a message and calls avb_abort().
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*/
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#define avb_fatal(message) \
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do { \
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avb_printv(avb_basename(__FILE__), \
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":", \
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AVB_TO_STRING(__LINE__), \
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": FATAL: ", \
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message, \
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NULL); \
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avb_abort(); \
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} while (0)
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#define avb_fatalv(message, ...) \
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do { \
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avb_printv(avb_basename(__FILE__), \
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":", \
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AVB_TO_STRING(__LINE__), \
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": FATAL: ", \
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message, \
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##__VA_ARGS__); \
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avb_abort(); \
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} while (0)
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/* Converts a 32-bit unsigned integer from big-endian to host byte order. */
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uint32_t avb_be32toh(uint32_t in) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Converts a 64-bit unsigned integer from big-endian to host byte order. */
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uint64_t avb_be64toh(uint64_t in) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Converts a 32-bit unsigned integer from host to big-endian byte order. */
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uint32_t avb_htobe32(uint32_t in) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Converts a 64-bit unsigned integer from host to big-endian byte order. */
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uint64_t avb_htobe64(uint64_t in) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Compare |n| bytes starting at |s1| with |s2| and return 0 if they
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* match, 1 if they don't. Returns 0 if |n|==0, since no bytes
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* mismatched.
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*
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* Time taken to perform the comparison is only dependent on |n| and
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* not on the relationship of the match between |s1| and |s2|.
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*
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* Note that unlike avb_memcmp(), this only indicates inequality, not
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* whether |s1| is less than or greater than |s2|.
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*/
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int avb_safe_memcmp(const void* s1,
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const void* s2,
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size_t n) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Adds |value_to_add| to |value| with overflow protection.
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*
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* Returns false if the addition overflows, true otherwise. In either
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* case, |value| is always modified.
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*/
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bool avb_safe_add_to(uint64_t* value,
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uint64_t value_to_add) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Adds |a| and |b| with overflow protection, returning the value in
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* |out_result|.
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*
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* It's permissible to pass NULL for |out_result| if you just want to
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* check that the addition would not overflow.
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*
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* Returns false if the addition overflows, true otherwise.
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*/
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bool avb_safe_add(uint64_t* out_result,
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uint64_t a,
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uint64_t b) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Checks if |num_bytes| data at |data| is a valid UTF-8
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* string. Returns true if valid UTF-8, false otherwise.
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*/
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bool avb_validate_utf8(const uint8_t* data,
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size_t num_bytes) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Concatenates |str1| (of |str1_len| bytes) and |str2| (of |str2_len|
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* bytes) and puts the result in |buf| which holds |buf_size|
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* bytes. The result is also guaranteed to be NUL terminated. Fail if
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* there is not enough room in |buf| for the resulting string plus
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* terminating NUL byte.
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*
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* Returns true if the operation succeeds, false otherwise.
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*/
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bool avb_str_concat(char* buf,
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size_t buf_size,
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const char* str1,
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size_t str1_len,
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const char* str2,
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size_t str2_len);
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/* Like avb_malloc_() but prints a error using avb_error() if memory
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* allocation fails.
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*/
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void* avb_malloc(size_t size) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Like avb_malloc() but sets the memory with zeroes. */
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void* avb_calloc(size_t size) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Duplicates a NUL-terminated string. Returns NULL on OOM. */
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char* avb_strdup(const char* str) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Duplicates a NULL-terminated array of NUL-terminated strings by
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* concatenating them. The returned string will be
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* NUL-terminated. Returns NULL on OOM.
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*/
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char* avb_strdupv(const char* str,
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...) AVB_ATTR_WARN_UNUSED_RESULT AVB_ATTR_SENTINEL;
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/* Finds the first occurrence of |needle| in the string |haystack|
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* where both strings are NUL-terminated strings. The terminating NUL
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* bytes are not compared.
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*
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* Returns NULL if not found, otherwise points into |haystack| for the
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* first occurrence of |needle|.
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*/
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const char* avb_strstr(const char* haystack,
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const char* needle) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Finds the first occurrence of |str| in the NULL-terminated string
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* array |strings|. Each element in |strings| must be
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* NUL-terminated. The string given by |str| need not be
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* NUL-terminated but its size must be given in |str_size|.
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*
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* Returns NULL if not found, otherwise points into |strings| for the
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* first occurrence of |str|.
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*/
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const char* avb_strv_find_str(const char* const* strings,
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const char* str,
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size_t str_size);
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/* Replaces all occurrences of |search| with |replace| in |str|.
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*
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* Returns a newly allocated string or NULL if out of memory.
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*/
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char* avb_replace(const char* str,
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const char* search,
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const char* replace) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Calculates the CRC-32 for data in |buf| of size |buf_size|. */
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uint32_t avb_crc32(const uint8_t* buf, size_t buf_size);
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/* Returns the basename of |str|. This is defined as the last path
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* component, assuming the normal POSIX separator '/'. If there are no
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* separators, returns |str|.
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*/
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const char* avb_basename(const char* str);
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/* Converts any ascii lowercase characters in |str| to uppercase in-place.
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* |str| must be NUL-terminated and valid UTF-8.
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*/
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void avb_uppercase(char* str);
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/* Converts |data_len| bytes of |data| to hex and returns the result. Returns
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* NULL on OOM. Caller must free the returned string with avb_free.
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*/
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char* avb_bin2hex(const uint8_t* data, size_t data_len);
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#ifdef __cplusplus
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}
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#endif
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#endif /* AVB_UTIL_H_ */
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