Introduction
Introduction Statistics Contact Development Disclaimer Help
u32.c - 9base - revived minimalist port of Plan 9 userland to Unix
git clone git://git.suckless.org/9base
Log
Files
Refs
README
LICENSE
---
u32.c (2399B)
---
1 #include <lib9.h>
2
3 int
4 dec32(uchar *dest, int ndest, char *src, int nsrc)
5 {
6 char *s, *tab;
7 uchar *start;
8 int i, u[8];
9
10 if(ndest+1 < (5*nsrc+7)/8)
11 return -1;
12 start = dest;
13 tab = "23456789abcdefghijkmnpqrstuvwxyz";
14 while(nsrc>=8){
15 for(i=0; i<8; i++){
16 s = strchr(tab,(int)src[i]);
17 u[i] = s ? s-tab : 0;
18 }
19 *dest++ = (u[0]<<3) | (0x7 & (u[1]>>2));
20 *dest++ = ((0x3 & u[1])<<6) | (u[2]<<1) | (0x1 & (u[3]>>…
21 *dest++ = ((0xf & u[3])<<4) | (0xf & (u[4]>>1));
22 *dest++ = ((0x1 & u[4])<<7) | (u[5]<<2) | (0x3 & (u[6]>>…
23 *dest++ = ((0x7 & u[6])<<5) | u[7];
24 src += 8;
25 nsrc -= 8;
26 }
27 if(nsrc > 0){
28 if(nsrc == 1 || nsrc == 3 || nsrc == 6)
29 return -1;
30 for(i=0; i<nsrc; i++){
31 s = strchr(tab,(int)src[i]);
32 u[i] = s ? s-tab : 0;
33 }
34 *dest++ = (u[0]<<3) | (0x7 & (u[1]>>2));
35 if(nsrc == 2)
36 goto out;
37 *dest++ = ((0x3 & u[1])<<6) | (u[2]<<1) | (0x1 & (u[3]>>…
38 if(nsrc == 4)
39 goto out;
40 *dest++ = ((0xf & u[3])<<4) | (0xf & (u[4]>>1));
41 if(nsrc == 5)
42 goto out;
43 *dest++ = ((0x1 & u[4])<<7) | (u[5]<<2) | (0x3 & (u[6]>>…
44 }
45 out:
46 return dest-start;
47 }
48
49 int
50 enc32(char *dest, int ndest, uchar *src, int nsrc)
51 {
52 char *tab, *start;
53 int j;
54
55 if(ndest <= (8*nsrc+4)/5 )
56 return -1;
57 start = dest;
58 tab = "23456789abcdefghijkmnpqrstuvwxyz";
59 while(nsrc>=5){
60 j = (0x1f & (src[0]>>3));
61 *dest++ = tab[j];
62 j = (0x1c & (src[0]<<2)) | (0x03 & (src[1]>>6));
63 *dest++ = tab[j];
64 j = (0x1f & (src[1]>>1));
65 *dest++ = tab[j];
66 j = (0x10 & (src[1]<<4)) | (0x0f & (src[2]>>4));
67 *dest++ = tab[j];
68 j = (0x1e & (src[2]<<1)) | (0x01 & (src[3]>>7));
69 *dest++ = tab[j];
70 j = (0x1f & (src[3]>>2));
71 *dest++ = tab[j];
72 j = (0x18 & (src[3]<<3)) | (0x07 & (src[4]>>5));
73 *dest++ = tab[j];
74 j = (0x1f & (src[4]));
75 *dest++ = tab[j];
76 src += 5;
77 nsrc -= 5;
78 }
79 if(nsrc){
80 j = (0x1f & (src[0]>>3));
81 *dest++ = tab[j];
82 j = (0x1c & (src[0]<<2));
83 if(nsrc == 1)
84 goto out;
85 j |= (0x03 & (src[1]>>6));
86 *dest++ = tab[j];
87 j = (0x1f & (src[1]>>1));
88 if(nsrc == 2)
89 goto out;
90 *dest++ = tab[j];
91 j = (0x10 & (src[1]<<4));
92 if(nsrc == 3)
93 goto out;
94 j |= (0x0f & (src[2]>>4));
95 *dest++ = tab[j];
96 j = (0x1e & (src[2]<<1));
97 if(nsrc == 4)
98 goto out;
99 j |= (0x01 & (src[3]>>7));
100 *dest++ = tab[j];
101 j = (0x1f & (src[3]>>2));
102 *dest++ = tab[j];
103 j = (0x18 & (src[3]<<3));
104 out:
105 *dest++ = tab[j];
106 }
107 *dest = 0;
108 return dest-start;
109 }
You are viewing proxied material from suckless.org. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.