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Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 12 years 8 months ago. By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation. | |
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1 | /* |
2 | * lib/hexdump.c |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License version 2 as |
6 | * published by the Free Software Foundation. See README and COPYING for |
7 | * more details. |
8 | */ |
9 | |
10 | #include <linux/types.h> |
11 | #include <linux/ctype.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | |
15 | const char hex_asc[] = "0123456789abcdef"; |
16 | EXPORT_SYMBOL(hex_asc); |
17 | |
18 | /** |
19 | * hex_to_bin - convert a hex digit to its real value |
20 | * @ch: ascii character represents hex digit |
21 | * |
22 | * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad |
23 | * input. |
24 | */ |
25 | int hex_to_bin(char ch) |
26 | { |
27 | if ((ch >= '0') && (ch <= '9')) |
28 | return ch - '0'; |
29 | ch = tolower(ch); |
30 | if ((ch >= 'a') && (ch <= 'f')) |
31 | return ch - 'a' + 10; |
32 | return -1; |
33 | } |
34 | EXPORT_SYMBOL(hex_to_bin); |
35 | |
36 | /** |
37 | * hex2bin - convert an ascii hexadecimal string to its binary representation |
38 | * @dst: binary result |
39 | * @src: ascii hexadecimal string |
40 | * @count: result length |
41 | */ |
42 | void hex2bin(u8 *dst, const char *src, size_t count) |
43 | { |
44 | while (count--) { |
45 | *dst = hex_to_bin(*src++) << 4; |
46 | *dst += hex_to_bin(*src++); |
47 | dst++; |
48 | } |
49 | } |
50 | EXPORT_SYMBOL(hex2bin); |
51 | |
52 | /** |
53 | * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory |
54 | * @buf: data blob to dump |
55 | * @len: number of bytes in the @buf |
56 | * @rowsize: number of bytes to print per line; must be 16 or 32 |
57 | * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1) |
58 | * @linebuf: where to put the converted data |
59 | * @linebuflen: total size of @linebuf, including space for terminating NUL |
60 | * @ascii: include ASCII after the hex output |
61 | * |
62 | * hex_dump_to_buffer() works on one "line" of output at a time, i.e., |
63 | * 16 or 32 bytes of input data converted to hex + ASCII output. |
64 | * |
65 | * Given a buffer of u8 data, hex_dump_to_buffer() converts the input data |
66 | * to a hex + ASCII dump at the supplied memory location. |
67 | * The converted output is always NUL-terminated. |
68 | * |
69 | * E.g.: |
70 | * hex_dump_to_buffer(frame->data, frame->len, 16, 1, |
71 | * linebuf, sizeof(linebuf), true); |
72 | * |
73 | * example output buffer: |
74 | * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO |
75 | */ |
76 | void hex_dump_to_buffer(const void *buf, size_t len, int rowsize, |
77 | int groupsize, char *linebuf, size_t linebuflen, |
78 | bool ascii) |
79 | { |
80 | const u8 *ptr = buf; |
81 | u8 ch; |
82 | int j, lx = 0; |
83 | int ascii_column; |
84 | |
85 | if (rowsize != 16 && rowsize != 32) |
86 | rowsize = 16; |
87 | |
88 | if (!len) |
89 | goto nil; |
90 | if (len > rowsize) /* limit to one line at a time */ |
91 | len = rowsize; |
92 | if ((len % groupsize) != 0) /* no mixed size output */ |
93 | groupsize = 1; |
94 | |
95 | switch (groupsize) { |
96 | case 8: { |
97 | const u64 *ptr8 = buf; |
98 | int ngroups = len / groupsize; |
99 | |
100 | for (j = 0; j < ngroups; j++) |
101 | lx += scnprintf(linebuf + lx, linebuflen - lx, |
102 | "%s%16.16llx", j ? " " : "", |
103 | (unsigned long long)*(ptr8 + j)); |
104 | ascii_column = 17 * ngroups + 2; |
105 | break; |
106 | } |
107 | |
108 | case 4: { |
109 | const u32 *ptr4 = buf; |
110 | int ngroups = len / groupsize; |
111 | |
112 | for (j = 0; j < ngroups; j++) |
113 | lx += scnprintf(linebuf + lx, linebuflen - lx, |
114 | "%s%8.8x", j ? " " : "", *(ptr4 + j)); |
115 | ascii_column = 9 * ngroups + 2; |
116 | break; |
117 | } |
118 | |
119 | case 2: { |
120 | const u16 *ptr2 = buf; |
121 | int ngroups = len / groupsize; |
122 | |
123 | for (j = 0; j < ngroups; j++) |
124 | lx += scnprintf(linebuf + lx, linebuflen - lx, |
125 | "%s%4.4x", j ? " " : "", *(ptr2 + j)); |
126 | ascii_column = 5 * ngroups + 2; |
127 | break; |
128 | } |
129 | |
130 | default: |
131 | for (j = 0; (j < len) && (lx + 3) <= linebuflen; j++) { |
132 | ch = ptr[j]; |
133 | linebuf[lx++] = hex_asc_hi(ch); |
134 | linebuf[lx++] = hex_asc_lo(ch); |
135 | linebuf[lx++] = ' '; |
136 | } |
137 | if (j) |
138 | lx--; |
139 | |
140 | ascii_column = 3 * rowsize + 2; |
141 | break; |
142 | } |
143 | if (!ascii) |
144 | goto nil; |
145 | |
146 | while (lx < (linebuflen - 1) && lx < (ascii_column - 1)) |
147 | linebuf[lx++] = ' '; |
148 | for (j = 0; (j < len) && (lx + 2) < linebuflen; j++) { |
149 | ch = ptr[j]; |
150 | linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.'; |
151 | } |
152 | nil: |
153 | linebuf[lx++] = '\0'; |
154 | } |
155 | EXPORT_SYMBOL(hex_dump_to_buffer); |
156 | |
157 | #ifdef CONFIG_PRINTK |
158 | /** |
159 | * print_hex_dump - print a text hex dump to syslog for a binary blob of data |
160 | * @level: kernel log level (e.g. KERN_DEBUG) |
161 | * @prefix_str: string to prefix each line with; |
162 | * caller supplies trailing spaces for alignment if desired |
163 | * @prefix_type: controls whether prefix of an offset, address, or none |
164 | * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE) |
165 | * @rowsize: number of bytes to print per line; must be 16 or 32 |
166 | * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1) |
167 | * @buf: data blob to dump |
168 | * @len: number of bytes in the @buf |
169 | * @ascii: include ASCII after the hex output |
170 | * |
171 | * Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump |
172 | * to the kernel log at the specified kernel log level, with an optional |
173 | * leading prefix. |
174 | * |
175 | * print_hex_dump() works on one "line" of output at a time, i.e., |
176 | * 16 or 32 bytes of input data converted to hex + ASCII output. |
177 | * print_hex_dump() iterates over the entire input @buf, breaking it into |
178 | * "line size" chunks to format and print. |
179 | * |
180 | * E.g.: |
181 | * print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS, |
182 | * 16, 1, frame->data, frame->len, true); |
183 | * |
184 | * Example output using %DUMP_PREFIX_OFFSET and 1-byte mode: |
185 | * 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO |
186 | * Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode: |
187 | * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~. |
188 | */ |
189 | void print_hex_dump(const char *level, const char *prefix_str, int prefix_type, |
190 | int rowsize, int groupsize, |
191 | const void *buf, size_t len, bool ascii) |
192 | { |
193 | const u8 *ptr = buf; |
194 | int i, linelen, remaining = len; |
195 | unsigned char linebuf[32 * 3 + 2 + 32 + 1]; |
196 | |
197 | if (rowsize != 16 && rowsize != 32) |
198 | rowsize = 16; |
199 | |
200 | for (i = 0; i < len; i += rowsize) { |
201 | linelen = min(remaining, rowsize); |
202 | remaining -= rowsize; |
203 | |
204 | hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, |
205 | linebuf, sizeof(linebuf), ascii); |
206 | |
207 | switch (prefix_type) { |
208 | case DUMP_PREFIX_ADDRESS: |
209 | printk("%s%s%p: %s\n", |
210 | level, prefix_str, ptr + i, linebuf); |
211 | break; |
212 | case DUMP_PREFIX_OFFSET: |
213 | printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf); |
214 | break; |
215 | default: |
216 | printk("%s%s%s\n", level, prefix_str, linebuf); |
217 | break; |
218 | } |
219 | } |
220 | } |
221 | EXPORT_SYMBOL(print_hex_dump); |
222 | |
223 | /** |
224 | * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params |
225 | * @prefix_str: string to prefix each line with; |
226 | * caller supplies trailing spaces for alignment if desired |
227 | * @prefix_type: controls whether prefix of an offset, address, or none |
228 | * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE) |
229 | * @buf: data blob to dump |
230 | * @len: number of bytes in the @buf |
231 | * |
232 | * Calls print_hex_dump(), with log level of KERN_DEBUG, |
233 | * rowsize of 16, groupsize of 1, and ASCII output included. |
234 | */ |
235 | void print_hex_dump_bytes(const char *prefix_str, int prefix_type, |
236 | const void *buf, size_t len) |
237 | { |
238 | print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, 16, 1, |
239 | buf, len, true); |
240 | } |
241 | EXPORT_SYMBOL(print_hex_dump_bytes); |
242 | #endif |
243 |
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