Blame view
lib/hexdump.c
8.31 KB
99eaf3c45
|
1 2 3 4 5 6 7 8 9 10 11 12 |
/* * lib/hexdump.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. See README and COPYING for * more details. */ #include <linux/types.h> #include <linux/ctype.h> #include <linux/kernel.h> |
8bc3bcc93
|
13 |
#include <linux/export.h> |
0f70fe605
|
14 |
#include <asm/unaligned.h> |
99eaf3c45
|
15 |
|
3fc957721
|
16 17 |
const char hex_asc[] = "0123456789abcdef"; EXPORT_SYMBOL(hex_asc); |
c26d436cb
|
18 19 |
const char hex_asc_upper[] = "0123456789ABCDEF"; EXPORT_SYMBOL(hex_asc_upper); |
3fc957721
|
20 |
|
99eaf3c45
|
21 |
/** |
903788892
|
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 |
* hex_to_bin - convert a hex digit to its real value * @ch: ascii character represents hex digit * * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad * input. */ int hex_to_bin(char ch) { if ((ch >= '0') && (ch <= '9')) return ch - '0'; ch = tolower(ch); if ((ch >= 'a') && (ch <= 'f')) return ch - 'a' + 10; return -1; } EXPORT_SYMBOL(hex_to_bin); /** |
dc88e4602
|
40 41 42 43 |
* hex2bin - convert an ascii hexadecimal string to its binary representation * @dst: binary result * @src: ascii hexadecimal string * @count: result length |
b78049831
|
44 45 |
* * Return 0 on success, -1 in case of bad input. |
dc88e4602
|
46 |
*/ |
b78049831
|
47 |
int hex2bin(u8 *dst, const char *src, size_t count) |
dc88e4602
|
48 49 |
{ while (count--) { |
b78049831
|
50 51 52 53 54 55 56 |
int hi = hex_to_bin(*src++); int lo = hex_to_bin(*src++); if ((hi < 0) || (lo < 0)) return -1; *dst++ = (hi << 4) | lo; |
dc88e4602
|
57 |
} |
b78049831
|
58 |
return 0; |
dc88e4602
|
59 60 61 62 |
} EXPORT_SYMBOL(hex2bin); /** |
53d91c5ce
|
63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 |
* bin2hex - convert binary data to an ascii hexadecimal string * @dst: ascii hexadecimal result * @src: binary data * @count: binary data length */ char *bin2hex(char *dst, const void *src, size_t count) { const unsigned char *_src = src; while (count--) dst = hex_byte_pack(dst, *_src++); return dst; } EXPORT_SYMBOL(bin2hex); /** |
99eaf3c45
|
79 80 81 |
* hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory * @buf: data blob to dump * @len: number of bytes in the @buf |
c79092349
|
82 83 |
* @rowsize: number of bytes to print per line; must be 16 or 32 * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1) |
99eaf3c45
|
84 85 |
* @linebuf: where to put the converted data * @linebuflen: total size of @linebuf, including space for terminating NUL |
c79092349
|
86 |
* @ascii: include ASCII after the hex output |
99eaf3c45
|
87 88 |
* * hex_dump_to_buffer() works on one "line" of output at a time, i.e., |
c79092349
|
89 |
* 16 or 32 bytes of input data converted to hex + ASCII output. |
99eaf3c45
|
90 91 92 93 94 95 |
* * Given a buffer of u8 data, hex_dump_to_buffer() converts the input data * to a hex + ASCII dump at the supplied memory location. * The converted output is always NUL-terminated. * * E.g.: |
c79092349
|
96 |
* hex_dump_to_buffer(frame->data, frame->len, 16, 1, |
db0fd97c2
|
97 |
* linebuf, sizeof(linebuf), true); |
99eaf3c45
|
98 99 |
* * example output buffer: |
c79092349
|
100 |
* 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO |
114fc1afb
|
101 102 103 104 105 106 |
* * Return: * The amount of bytes placed in the buffer without terminating NUL. If the * output was truncated, then the return value is the number of bytes * (excluding the terminating NUL) which would have been written to the final * string if enough space had been available. |
99eaf3c45
|
107 |
*/ |
114fc1afb
|
108 109 |
int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize, char *linebuf, size_t linebuflen, bool ascii) |
99eaf3c45
|
110 111 |
{ const u8 *ptr = buf; |
5d909c8d5
|
112 |
int ngroups; |
99eaf3c45
|
113 114 |
u8 ch; int j, lx = 0; |
c79092349
|
115 |
int ascii_column; |
114fc1afb
|
116 |
int ret; |
99eaf3c45
|
117 |
|
c79092349
|
118 119 |
if (rowsize != 16 && rowsize != 32) rowsize = 16; |
c79092349
|
120 121 |
if (len > rowsize) /* limit to one line at a time */ len = rowsize; |
5d909c8d5
|
122 123 |
if (!is_power_of_2(groupsize) || groupsize > 8) groupsize = 1; |
c79092349
|
124 125 |
if ((len % groupsize) != 0) /* no mixed size output */ groupsize = 1; |
5d909c8d5
|
126 127 |
ngroups = len / groupsize; ascii_column = rowsize * 2 + rowsize / groupsize + 1; |
114fc1afb
|
128 129 130 131 132 133 |
if (!linebuflen) goto overflow1; if (!len) goto nil; |
5d909c8d5
|
134 |
if (groupsize == 8) { |
c79092349
|
135 |
const u64 *ptr8 = buf; |
c79092349
|
136 |
|
114fc1afb
|
137 138 139 |
for (j = 0; j < ngroups; j++) { ret = snprintf(linebuf + lx, linebuflen - lx, "%s%16.16llx", j ? " " : "", |
0f70fe605
|
140 |
get_unaligned(ptr8 + j)); |
114fc1afb
|
141 142 143 144 |
if (ret >= linebuflen - lx) goto overflow1; lx += ret; } |
5d909c8d5
|
145 |
} else if (groupsize == 4) { |
c79092349
|
146 |
const u32 *ptr4 = buf; |
c79092349
|
147 |
|
114fc1afb
|
148 149 150 |
for (j = 0; j < ngroups; j++) { ret = snprintf(linebuf + lx, linebuflen - lx, "%s%8.8x", j ? " " : "", |
0f70fe605
|
151 |
get_unaligned(ptr4 + j)); |
114fc1afb
|
152 153 154 155 |
if (ret >= linebuflen - lx) goto overflow1; lx += ret; } |
5d909c8d5
|
156 |
} else if (groupsize == 2) { |
c79092349
|
157 |
const u16 *ptr2 = buf; |
c79092349
|
158 |
|
114fc1afb
|
159 160 161 |
for (j = 0; j < ngroups; j++) { ret = snprintf(linebuf + lx, linebuflen - lx, "%s%4.4x", j ? " " : "", |
0f70fe605
|
162 |
get_unaligned(ptr2 + j)); |
114fc1afb
|
163 164 165 166 |
if (ret >= linebuflen - lx) goto overflow1; lx += ret; } |
5d909c8d5
|
167 |
} else { |
114fc1afb
|
168 |
for (j = 0; j < len; j++) { |
9f029f540
|
169 |
if (linebuflen < lx + 2) |
114fc1afb
|
170 |
goto overflow2; |
c79092349
|
171 |
ch = ptr[j]; |
3fc957721
|
172 |
linebuf[lx++] = hex_asc_hi(ch); |
9f029f540
|
173 174 |
if (linebuflen < lx + 2) goto overflow2; |
3fc957721
|
175 |
linebuf[lx++] = hex_asc_lo(ch); |
9f029f540
|
176 177 |
if (linebuflen < lx + 2) goto overflow2; |
99eaf3c45
|
178 |
linebuf[lx++] = ' '; |
c79092349
|
179 |
} |
c67ae69b6
|
180 181 |
if (j) lx--; |
99eaf3c45
|
182 |
} |
c79092349
|
183 184 |
if (!ascii) goto nil; |
114fc1afb
|
185 186 187 |
while (lx < ascii_column) { if (linebuflen < lx + 2) goto overflow2; |
99eaf3c45
|
188 |
linebuf[lx++] = ' '; |
114fc1afb
|
189 190 191 192 |
} for (j = 0; j < len; j++) { if (linebuflen < lx + 2) goto overflow2; |
db0fd97c2
|
193 194 195 |
ch = ptr[j]; linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.'; } |
c79092349
|
196 |
nil: |
114fc1afb
|
197 198 199 |
linebuf[lx] = '\0'; return lx; overflow2: |
99eaf3c45
|
200 |
linebuf[lx++] = '\0'; |
114fc1afb
|
201 202 |
overflow1: return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1; |
99eaf3c45
|
203 204 |
} EXPORT_SYMBOL(hex_dump_to_buffer); |
ac83ed687
|
205 |
#ifdef CONFIG_PRINTK |
99eaf3c45
|
206 207 208 |
/** * print_hex_dump - print a text hex dump to syslog for a binary blob of data * @level: kernel log level (e.g. KERN_DEBUG) |
c79092349
|
209 210 |
* @prefix_str: string to prefix each line with; * caller supplies trailing spaces for alignment if desired |
99eaf3c45
|
211 212 |
* @prefix_type: controls whether prefix of an offset, address, or none * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE) |
c79092349
|
213 214 |
* @rowsize: number of bytes to print per line; must be 16 or 32 * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1) |
99eaf3c45
|
215 216 |
* @buf: data blob to dump * @len: number of bytes in the @buf |
c79092349
|
217 |
* @ascii: include ASCII after the hex output |
99eaf3c45
|
218 219 220 221 222 |
* * Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump * to the kernel log at the specified kernel log level, with an optional * leading prefix. * |
c79092349
|
223 224 225 226 227 |
* print_hex_dump() works on one "line" of output at a time, i.e., * 16 or 32 bytes of input data converted to hex + ASCII output. * print_hex_dump() iterates over the entire input @buf, breaking it into * "line size" chunks to format and print. * |
99eaf3c45
|
228 |
* E.g.: |
c79092349
|
229 |
* print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS, |
db0fd97c2
|
230 |
* 16, 1, frame->data, frame->len, true); |
99eaf3c45
|
231 |
* |
c79092349
|
232 233 234 235 |
* Example output using %DUMP_PREFIX_OFFSET and 1-byte mode: * 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO * Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode: * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~. |
99eaf3c45
|
236 |
*/ |
c79092349
|
237 |
void print_hex_dump(const char *level, const char *prefix_str, int prefix_type, |
db0fd97c2
|
238 239 |
int rowsize, int groupsize, const void *buf, size_t len, bool ascii) |
99eaf3c45
|
240 |
{ |
6a0ed91e3
|
241 |
const u8 *ptr = buf; |
99eaf3c45
|
242 |
int i, linelen, remaining = len; |
db0fd97c2
|
243 |
unsigned char linebuf[32 * 3 + 2 + 32 + 1]; |
99eaf3c45
|
244 |
|
c79092349
|
245 246 247 248 249 250 |
if (rowsize != 16 && rowsize != 32) rowsize = 16; for (i = 0; i < len; i += rowsize) { linelen = min(remaining, rowsize); remaining -= rowsize; |
db0fd97c2
|
251 |
|
c79092349
|
252 |
hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, |
db0fd97c2
|
253 |
linebuf, sizeof(linebuf), ascii); |
99eaf3c45
|
254 255 256 |
switch (prefix_type) { case DUMP_PREFIX_ADDRESS: |
db0fd97c2
|
257 258 259 |
printk("%s%s%p: %s ", level, prefix_str, ptr + i, linebuf); |
99eaf3c45
|
260 261 |
break; case DUMP_PREFIX_OFFSET: |
c79092349
|
262 263 |
printk("%s%s%.8x: %s ", level, prefix_str, i, linebuf); |
99eaf3c45
|
264 265 |
break; default: |
c79092349
|
266 267 |
printk("%s%s%s ", level, prefix_str, linebuf); |
99eaf3c45
|
268 269 270 271 272 |
break; } } } EXPORT_SYMBOL(print_hex_dump); |
c79092349
|
273 |
|
7a555613e
|
274 |
#if !defined(CONFIG_DYNAMIC_DEBUG) |
c79092349
|
275 276 277 278 279 280 281 282 283 284 285 286 287 |
/** * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params * @prefix_str: string to prefix each line with; * caller supplies trailing spaces for alignment if desired * @prefix_type: controls whether prefix of an offset, address, or none * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE) * @buf: data blob to dump * @len: number of bytes in the @buf * * Calls print_hex_dump(), with log level of KERN_DEBUG, * rowsize of 16, groupsize of 1, and ASCII output included. */ void print_hex_dump_bytes(const char *prefix_str, int prefix_type, |
db0fd97c2
|
288 |
const void *buf, size_t len) |
c79092349
|
289 290 |
{ print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, 16, 1, |
db0fd97c2
|
291 |
buf, len, true); |
c79092349
|
292 293 |
} EXPORT_SYMBOL(print_hex_dump_bytes); |
7a555613e
|
294 295 |
#endif /* !defined(CONFIG_DYNAMIC_DEBUG) */ #endif /* defined(CONFIG_PRINTK) */ |