1 /* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
2
3 #include "lib.h"
4 #include "buffer.h"
5 #include "hex-binary.h"
6
7 static void
binary_to_hex_case(unsigned char * dest,const unsigned char * data,size_t size,bool ucase)8 binary_to_hex_case(unsigned char *dest, const unsigned char *data,
9 size_t size, bool ucase)
10 {
11 unsigned char *p;
12 char base_char;
13 size_t i;
14 int value;
15
16 /* @UNSAFE */
17 base_char = ucase ? 'A' : 'a';
18
19 p = dest;
20 for (i = 0; i < size; i++) {
21 value = data[i] >> 4;
22 *p++ = value < 10 ? value + '0' : value - 10 + base_char;
23
24 value = data[i] & 0x0f;
25 *p++ = value < 10 ? value + '0' : value - 10 + base_char;
26 }
27 }
28
binary_to_hex(const unsigned char * data,size_t size)29 const char *binary_to_hex(const unsigned char *data, size_t size)
30 {
31 unsigned char *dest = t_malloc_no0(MALLOC_MULTIPLY(size, 2) + 1);
32
33 binary_to_hex_case(dest, data, size, FALSE);
34 dest[size*2] = '\0';
35 return (char *)dest;
36 }
37
binary_to_hex_ucase(const unsigned char * data,size_t size)38 const char *binary_to_hex_ucase(const unsigned char *data, size_t size)
39 {
40 unsigned char *dest = t_malloc_no0(MALLOC_MULTIPLY(size, 2) + 1);
41
42 binary_to_hex_case(dest, data, size, TRUE);
43 dest[size*2] = '\0';
44 return (char *)dest;
45 }
46
binary_to_hex_append(string_t * dest,const unsigned char * data,size_t size)47 void binary_to_hex_append(string_t *dest, const unsigned char *data,
48 size_t size)
49 {
50 unsigned char *buf;
51
52 buf = buffer_append_space_unsafe(dest, size * 2);
53 binary_to_hex_case(buf, data, size, FALSE);
54 }
55
hex_to_binary(const char * data,buffer_t * dest)56 int hex_to_binary(const char *data, buffer_t *dest)
57 {
58 int value;
59
60 while (*data != '\0') {
61 if (*data >= '0' && *data <= '9')
62 value = (*data - '0') << 4;
63 else if (*data >= 'a' && *data <= 'f')
64 value = (*data - 'a' + 10) << 4;
65 else if (*data >= 'A' && *data <= 'F')
66 value = (*data - 'A' + 10) << 4;
67 else
68 return -1;
69
70 data++;
71 if (*data >= '0' && *data <= '9')
72 value |= *data - '0';
73 else if (*data >= 'a' && *data <= 'f')
74 value |= *data - 'a' + 10;
75 else if (*data >= 'A' && *data <= 'F')
76 value |= *data - 'A' + 10;
77 else
78 return -1;
79
80 buffer_append_c(dest, value);
81 data++;
82 }
83
84 return 0;
85 }
86