include/hexdump.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (C) 2018 Synopsys, Inc. All rights reserved.
   4  *
   5  */
   6
   7 #ifndef HEXDUMP_H
   8 #define HEXDUMP_H
   9
  10 #include <linux/ctype.h>
  11 #include <linux/types.h>
  12
  13 enum {
  14         DUMP_PREFIX_NONE,
  15         DUMP_PREFIX_ADDRESS,
  16         DUMP_PREFIX_OFFSET
  17 };
  18
  19 extern const char hex_asc[];
  20 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
  21 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
  22
  23 static inline char *hex_byte_pack(char *buf, u8 byte)
  24 {
  25         *buf++ = hex_asc_hi(byte);
  26         *buf++ = hex_asc_lo(byte);
  27         return buf;
  28 }
  29
  30 /**
  31  * hex_to_bin - convert a hex digit to its real value
  32  * @ch: ascii character represents hex digit
  33  *
  34  * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
  35  * input.
  36  */
  37 static inline int hex_to_bin(char ch)
  38 {
  39         if ((ch >= '0') && (ch <= '9'))
  40                 return ch - '0';
  41         ch = tolower(ch);
  42         if ((ch >= 'a') && (ch <= 'f'))
  43                 return ch - 'a' + 10;
  44         return -1;
  45 }
  46
  47 /**
  48  * hex2bin - convert an ascii hexadecimal string to its binary representation
  49  * @dst: binary result
  50  * @src: ascii hexadecimal string
  51  * @count: result length
  52  *
  53  * Return 0 on success, -1 in case of bad input.
  54  */
  55 static inline int hex2bin(u8 *dst, const char *src, size_t count)
  56 {
  57         while (count--) {
  58                 int hi = hex_to_bin(*src++);
  59                 int lo = hex_to_bin(*src++);
  60
  61                 if ((hi < 0) || (lo < 0))
  62                         return -1;
  63
  64                 *dst++ = (hi << 4) | lo;
  65         }
  66         return 0;
  67 }
  68
  69 /**
  70  * bin2hex - convert binary data to an ascii hexadecimal string
  71  * @dst: ascii hexadecimal result
  72  * @src: binary data
  73  * @count: binary data length
  74  */
  75 static inline char *bin2hex(char *dst, const void *src, size_t count)
  76 {
  77         const unsigned char *_src = src;
  78
  79         while (count--)
  80                 dst = hex_byte_pack(dst, *_src++);
  81         return dst;
  82 }
  83
  84 int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
  85                        char *linebuf, size_t linebuflen, bool ascii);
  86 void print_hex_dump(const char *prefix_str, int prefix_type, int rowsize,
  87                     int groupsize, const void *buf, size_t len, bool ascii);
  88 void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
  89                           const void *buf, size_t len);
  90
  91 #endif /* HEXDUMP_H */