| /* vi: set sw=4 ts=4: */ |
| /* |
| * Copyright 2006 Rob Landley <rob@landley.net> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| #include "libbb.h" |
| |
| /* Conversion table. for base 64 */ |
| const char bb_uuenc_tbl_base64[65 + 2] = { |
| 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', |
| 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', |
| 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', |
| 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', |
| 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', |
| 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', |
| 'w', 'x', 'y', 'z', '0', '1', '2', '3', |
| '4', '5', '6', '7', '8', '9', '+', '/', |
| '=' /* termination character */, |
| '\n', '\0' /* needed for uudecode.c */ |
| }; |
| |
| const char bb_uuenc_tbl_std[65] = { |
| '`', '!', '"', '#', '$', '%', '&', '\'', |
| '(', ')', '*', '+', ',', '-', '.', '/', |
| '0', '1', '2', '3', '4', '5', '6', '7', |
| '8', '9', ':', ';', '<', '=', '>', '?', |
| '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', |
| 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', |
| 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', |
| 'X', 'Y', 'Z', '[', '\\', ']', '^', '_', |
| '`' /* termination character */ |
| }; |
| |
| /* |
| * Encode the string S of length LENGTH to base64 format and place it |
| * to STORE. STORE will be 0-terminated, and must point to a writable |
| * buffer of at least 1+BASE64_LENGTH(length) bytes. |
| * where BASE64_LENGTH(len) = (4 * ((LENGTH + 2) / 3)) |
| */ |
| void bb_uuencode(const unsigned char *s, char *store, const int length, const char *tbl) |
| { |
| int i; |
| char *p = store; |
| |
| /* Transform the 3x8 bits to 4x6 bits, as required by base64. */ |
| for (i = 0; i < length; i += 3) { |
| *p++ = tbl[s[0] >> 2]; |
| *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)]; |
| *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)]; |
| *p++ = tbl[s[2] & 0x3f]; |
| s += 3; |
| } |
| /* Pad the result if necessary... */ |
| if (i == length + 1) { |
| *(p - 1) = tbl[64]; |
| } |
| else if (i == length + 2) { |
| *(p - 1) = *(p - 2) = tbl[64]; |
| } |
| /* ...and zero-terminate it. */ |
| *p = '\0'; |
| } |