Contents of /tags/mkinitrd-6_2_1/busybox/libbb/uuencode.c
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2027 byte(s)
tagged 'mkinitrd-6_2_1'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Copyright 2006 Rob Landley <rob@landley.net> |
4 | * |
5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
6 | */ |
7 | |
8 | #include "libbb.h" |
9 | |
10 | /* Conversion table. for base 64 */ |
11 | const char bb_uuenc_tbl_base64[65 + 2] ALIGN1 = { |
12 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', |
13 | 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', |
14 | 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', |
15 | 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', |
16 | 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', |
17 | 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', |
18 | 'w', 'x', 'y', 'z', '0', '1', '2', '3', |
19 | '4', '5', '6', '7', '8', '9', '+', '/', |
20 | '=' /* termination character */, |
21 | '\n', '\0' /* needed for uudecode.c */ |
22 | }; |
23 | |
24 | const char bb_uuenc_tbl_std[65] ALIGN1 = { |
25 | '`', '!', '"', '#', '$', '%', '&', '\'', |
26 | '(', ')', '*', '+', ',', '-', '.', '/', |
27 | '0', '1', '2', '3', '4', '5', '6', '7', |
28 | '8', '9', ':', ';', '<', '=', '>', '?', |
29 | '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', |
30 | 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', |
31 | 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', |
32 | 'X', 'Y', 'Z', '[', '\\', ']', '^', '_', |
33 | '`' /* termination character */ |
34 | }; |
35 | |
36 | /* |
37 | * Encode bytes at S of length LENGTH to uuencode or base64 format and place it |
38 | * to STORE. STORE will be 0-terminated, and must point to a writable |
39 | * buffer of at least 1+BASE64_LENGTH(length) bytes. |
40 | * where BASE64_LENGTH(len) = (4 * ((LENGTH + 2) / 3)) |
41 | */ |
42 | void FAST_FUNC bb_uuencode(char *p, const void *src, int length, const char *tbl) |
43 | { |
44 | const unsigned char *s = src; |
45 | |
46 | /* Transform the 3x8 bits to 4x6 bits */ |
47 | while (length > 0) { |
48 | unsigned s1, s2; |
49 | |
50 | /* Are s[1], s[2] valid or should be assumed 0? */ |
51 | s1 = s2 = 0; |
52 | length -= 3; /* can be >=0, -1, -2 */ |
53 | if (length >= -1) { |
54 | s1 = s[1]; |
55 | if (length >= 0) |
56 | s2 = s[2]; |
57 | } |
58 | *p++ = tbl[s[0] >> 2]; |
59 | *p++ = tbl[((s[0] & 3) << 4) + (s1 >> 4)]; |
60 | *p++ = tbl[((s1 & 0xf) << 2) + (s2 >> 6)]; |
61 | *p++ = tbl[s2 & 0x3f]; |
62 | s += 3; |
63 | } |
64 | /* Zero-terminate */ |
65 | *p = '\0'; |
66 | /* If length is -2 or -1, pad last char or two */ |
67 | while (length) { |
68 | *--p = tbl[64]; |
69 | length++; |
70 | } |
71 | } |