1 /*
2 * Helper to hexdump a buffer
3 *
4 * Copyright (c) 2013 Red Hat, Inc.
5 * Copyright (c) 2013 Gerd Hoffmann <kraxel@redhat.com>
6 * Copyright (c) 2013 Peter Crosthwaite <peter.crosthwaite@xilinx.com>
7 * Copyright (c) 2013 Xilinx, Inc
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
14 */
15
16 #include "qemu/osdep.h"
17 #include "qemu/cutils.h"
18
hexdump_nibble(unsigned x)19 static inline char hexdump_nibble(unsigned x)
20 {
21 return (x < 10 ? '0' : 'a' - 10) + x;
22 }
23
qemu_hexdump_line(GString * str,const void * vbuf,size_t len,size_t unit_len,size_t block_len)24 GString *qemu_hexdump_line(GString *str, const void *vbuf, size_t len,
25 size_t unit_len, size_t block_len)
26 {
27 const uint8_t *buf = vbuf;
28 size_t u, b;
29
30 if (str == NULL) {
31 /* Estimate the length of the output to avoid reallocs. */
32 size_t est = len * 2;
33 if (unit_len) {
34 est += len / unit_len;
35 }
36 if (block_len) {
37 est += len / block_len;
38 }
39 str = g_string_sized_new(est + 1);
40 }
41
42 for (u = 0, b = 0; len; u++, b++, len--, buf++) {
43 uint8_t c;
44
45 if (unit_len && u == unit_len) {
46 g_string_append_c(str, ' ');
47 u = 0;
48 }
49 if (block_len && b == block_len) {
50 g_string_append_c(str, ' ');
51 b = 0;
52 }
53
54 c = *buf;
55 g_string_append_c(str, hexdump_nibble(c / 16));
56 g_string_append_c(str, hexdump_nibble(c % 16));
57 }
58
59 return str;
60 }
61
asciidump_line(char * line,const void * bufptr,size_t len)62 static void asciidump_line(char *line, const void *bufptr, size_t len)
63 {
64 const char *buf = bufptr;
65
66 for (size_t i = 0; i < len; i++) {
67 char c = buf[i];
68
69 if (c < ' ' || c > '~') {
70 c = '.';
71 }
72 *line++ = c;
73 }
74 *line = '\0';
75 }
76
77 #define QEMU_HEXDUMP_LINE_BYTES 16
78 #define QEMU_HEXDUMP_LINE_WIDTH \
79 (QEMU_HEXDUMP_LINE_BYTES * 2 + QEMU_HEXDUMP_LINE_BYTES / 4)
80
qemu_hexdump(FILE * fp,const char * prefix,const void * bufptr,size_t size)81 void qemu_hexdump(FILE *fp, const char *prefix,
82 const void *bufptr, size_t size)
83 {
84 g_autoptr(GString) str = g_string_sized_new(QEMU_HEXDUMP_LINE_WIDTH + 1);
85 char ascii[QEMU_HEXDUMP_LINE_BYTES + 1];
86 size_t b, len;
87
88 for (b = 0; b < size; b += len) {
89 len = MIN(size - b, QEMU_HEXDUMP_LINE_BYTES);
90
91 g_string_truncate(str, 0);
92 qemu_hexdump_line(str, bufptr + b, len, 1, 4);
93 asciidump_line(ascii, bufptr + b, len);
94
95 fprintf(fp, "%s: %04zx: %-*s %s\n",
96 prefix, b, QEMU_HEXDUMP_LINE_WIDTH, str->str, ascii);
97 }
98
99 }
100