diff options
| -rw-r--r-- | src/modules/rtp/base64.c | 128 | ||||
| -rw-r--r-- | src/modules/rtp/base64.h | 35 |
2 files changed, 163 insertions, 0 deletions
diff --git a/src/modules/rtp/base64.c b/src/modules/rtp/base64.c new file mode 100644 index 00000000..ec9f2212 --- /dev/null +++ b/src/modules/rtp/base64.c @@ -0,0 +1,128 @@ +/* $Id$ */ + +/*** + This file is part of PulseAudio. + + Copyright 2008 Colin Guthrie + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2 of the License, + or (at your option) any later version. + + PulseAudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with PulseAudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +/* + This file was originally inspired by a file developed by + Kungliga Tekniska H�gskolan +*/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdlib.h> +#include <string.h> + +#include "base64.h" + +static char base64_chars[] = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +static int pos(char c) +{ + char *p; + for (p = base64_chars; *p; p++) + if (*p == c) + return p - base64_chars; + return -1; +} + +int pa_base64_encode(const void *data, int size, char **str) +{ + char *s, *p; + int i; + int c; + const unsigned char *q; + + p = s = (char *) malloc(size * 4 / 3 + 4); + if (p == NULL) + return -1; + q = (const unsigned char *) data; + i = 0; + for (i = 0; i < size;) { + c = q[i++]; + c *= 256; + if (i < size) + c += q[i]; + i++; + c *= 256; + if (i < size) + c += q[i]; + i++; + p[0] = base64_chars[(c & 0x00fc0000) >> 18]; + p[1] = base64_chars[(c & 0x0003f000) >> 12]; + p[2] = base64_chars[(c & 0x00000fc0) >> 6]; + p[3] = base64_chars[(c & 0x0000003f) >> 0]; + if (i > size) + p[3] = '='; + if (i > size + 1) + p[2] = '='; + p += 4; + } + *p = 0; + *str = s; + return strlen(s); +} + +#define DECODE_ERROR 0xffffffff + +static unsigned int token_decode(const char *token) +{ + int i; + unsigned int val = 0; + int marker = 0; + if (strlen(token) < 4) + return DECODE_ERROR; + for (i = 0; i < 4; i++) { + val *= 64; + if (token[i] == '=') + marker++; + else if (marker > 0) + return DECODE_ERROR; + else + val += pos(token[i]); + } + if (marker > 2) + return DECODE_ERROR; + return (marker << 24) | val; +} + +int pa_base64_decode(const char *str, void *data) +{ + const char *p; + unsigned char *q; + + q = data; + for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) { + unsigned int val = token_decode(p); + unsigned int marker = (val >> 24) & 0xff; + if (val == DECODE_ERROR) + return -1; + *q++ = (val >> 16) & 0xff; + if (marker < 2) + *q++ = (val >> 8) & 0xff; + if (marker < 1) + *q++ = val & 0xff; + } + return q - (unsigned char *) data; +} diff --git a/src/modules/rtp/base64.h b/src/modules/rtp/base64.h new file mode 100644 index 00000000..199c6352 --- /dev/null +++ b/src/modules/rtp/base64.h @@ -0,0 +1,35 @@ +#ifndef foobase64hfoo +#define foobase64hfoo + +/* $Id$ */ + +/*** + This file is part of PulseAudio. + + Copyright 2008 Colin Guthrie + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2 of the License, + or (at your option) any later version. + + PulseAudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with PulseAudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +/* + This file was originally inspired by a file developed by + Kungliga Tekniska Högskolan +*/ + +int pa_base64_encode(const void *data, int size, char **str); +int pa_base64_decode(const char *str, void *data); + +#endif |