raop: Move base64 implementation to a util file

Base64 implementation is now in a common file called raop_util.c.
Old Base64 files are removed but copyright is preserved.

Original patch by Martin Blanchard, patch splitted by
Hajime Fujita <crisp.fujita@nifty.com>.

src/Makefile.am

@@ -1155,9 +1155,9 @@ librtp_la_LIBADD = $(AM_LIBADD) libpulsecore-@PA_MAJORMINOR@.la libpulsecommon-@
 
 libraop_la_SOURCES = \
         modules/raop/raop_client.c modules/raop/raop_client.h \
+        modules/raop/raop_packet_buffer.h modules/raop/raop_packet_buffer.c \
         modules/raop/raop_crypto.c modules/raop/raop_crypto.h \
-        modules/raop/base64.c modules/raop/base64.h \
-        modules/raop/raop_packet_buffer.h modules/raop/raop_packet_buffer.c
+        modules/raop/raop_util.c modules/raop/raop_util.h
 libraop_la_CFLAGS = $(AM_CFLAGS) $(OPENSSL_CFLAGS) -I$(top_srcdir)/src/modules/rtp
 libraop_la_LDFLAGS = $(AM_LDFLAGS) $(AM_LIBLDFLAGS) -avoid-version
 libraop_la_LIBADD = $(AM_LIBADD) $(OPENSSL_LIBS) libpulsecore-@PA_MAJORMINOR@.la librtp.la libpulsecommon-@PA_MAJORMINOR@.la libpulse.la

src/modules/raop/raop_client.c

@@ -53,7 +53,7 @@
 #include "rtsp_client.h"
 #include "raop_packet_buffer.h"
 #include "raop_crypto.h"
-#include "base64.h"
+#include "raop_util.h"
 
 #define JACK_STATUS_DISCONNECTED 0
 #define JACK_STATUS_CONNECTED 1
@@ -528,7 +528,7 @@ static void do_rtsp_announce(pa_raop_client *c) {
     /* UDP protocol does not need "Apple-Challenge" at announce. */
     if (c->protocol == RAOP_TCP) {
         pa_random(&rand_data, sizeof(rand_data));
-        pa_base64_encode(&rand_data, sizeof(rand_data), &sac);
+        pa_raop_base64_encode(&rand_data, 8*sizeof(rand_data), &sac);
         rtrimchar(sac, '=');
         pa_rtsp_add_header(c->rtsp, "Apple-Challenge", sac);
     }
@@ -689,7 +689,7 @@ static void udp_rtsp_cb(pa_rtsp_client *rtsp, pa_rtsp_state state, pa_headerlist
 
             /* Set the Apple-Challenge key */
             pa_random(&rand, sizeof(rand));
-            pa_base64_encode(&rand, sizeof(rand), &sac);
+            pa_raop_base64_encode(&rand, 8*sizeof(rand), &sac);
             rtrimchar(sac, '=');
             pa_rtsp_add_header(c->rtsp, "Apple-Challenge", sac);
 

src/modules/raop/raop_crypto.c

@@ -37,7 +37,7 @@
 #include <pulsecore/random.h>
 
 #include "raop_crypto.h"
-#include "base64.h"
+#include "raop_util.h"
 
 #define AES_CHUNK_SIZE 16
 
@@ -85,9 +85,9 @@ static int rsa_encrypt(uint8_t *data, int len, uint8_t *str) {
     pa_assert(str);
 
     rsa = RSA_new();
-    size = pa_base64_decode(rsa_modulus, modules);
+    size = pa_raop_base64_decode(rsa_modulus, modules);
     n_bn = BN_bin2bn(modules, size, NULL);
-    size = pa_base64_decode(rsa_exponent, exponent);
+    size = pa_raop_base64_decode(rsa_exponent, exponent);
     e_bn = BN_bin2bn(exponent, size, NULL);
     RSA_set0_key(rsa, n_bn, e_bn, NULL);
 
@@ -120,7 +120,7 @@ char* pa_raop_secret_get_iv(pa_raop_secret *s) {
 
     pa_assert(s);
 
-    pa_base64_encode(s->iv, AES_CHUNK_SIZE, &base64_iv);
+    pa_raop_base64_encode(s->iv, AES_CHUNK_SIZE, &base64_iv);
 
     return base64_iv;
 }
@@ -134,7 +134,7 @@ char* pa_raop_secret_get_key(pa_raop_secret *s) {
 
     /* Encrypt our AES public key to send to the device */
     size = rsa_encrypt(s->key, AES_CHUNK_SIZE, rsa_key);
-    pa_base64_encode(rsa_key, size, &base64_key);
+    pa_raop_base64_encode(rsa_key, size, &base64_key);
 
     return base64_key;
 }

src/modules/raop/raop_util.c

@@ -1,7 +1,8 @@
 /***
   This file is part of PulseAudio.
 
-  Copyright 2008 Colin Guthrie
+  Copyright 2013 Martin Blanchard
+  Copyright Kungliga Tekniska Høgskolan & 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
@@ -18,8 +19,8 @@
 ***/
 
 /***
-  This file was originally inspired by a file developed by
-  Kungliga Tekniska högskolan
+  The base64 implementation was originally inspired by a file developed
+  by Kungliga Tekniska högskolan.
 ***/
 
 #ifdef HAVE_CONFIG_H
@@ -31,12 +32,16 @@
 
 #include <pulse/xmalloc.h>
 
-#include "base64.h"
+#include <pulsecore/macro.h>
+
+#include "raop_util.h"
+
+#define BASE64_DECODE_ERROR 0xffffffff
 
 static const char base64_chars[] =
     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
-static int pos(char c) {
+static int char_position(char c) {
     if (c >= 'A' && c <= 'Z')
         return c - 'A' + 0;
     if (c >= 'a' && c <= 'z')
@@ -51,79 +56,81 @@ static int pos(char c) {
     return -1;
 }
 
-int pa_base64_encode(const void *data, int size, char **str) {
-    char *s, *p;
+static unsigned int token_decode(const char *token) {
+    unsigned int val = 0;
+    int marker = 0;
     int i;
-    int c;
-    const unsigned char *q;
 
-    p = s = pa_xnew(char, size * 4 / 3 + 4);
+    if (strlen(token) < 4)
+        return BASE64_DECODE_ERROR;
+    for (i = 0; i < 4; i++) {
+        val *= 64;
+        if (token[i] == '=')
+            marker++;
+        else if (marker > 0)
+            return BASE64_DECODE_ERROR;
+        else {
+            int lpos = char_position(token[i]);
+            if (lpos < 0)
+                return BASE64_DECODE_ERROR;
+            val += lpos;
+        }
+    }
+
+    if (marker > 2)
+        return BASE64_DECODE_ERROR;
+
+    return (marker << 24) | val;
+}
+
+int pa_raop_base64_encode(const void *data, int len, char **str) {
+    const unsigned char *q;
+    char *p, *s = NULL;
+    int i, c;
+
+    pa_assert(data);
+    pa_assert(str);
+
+    p = s = pa_xnew(char, len * 4 / 3 + 4);
     q = (const unsigned char *) data;
-    for (i = 0; i < size;) {
+    for (i = 0; i < len;) {
         c = q[i++];
         c *= 256;
-        if (i < size)
+        if (i < len)
             c += q[i];
         i++;
         c *= 256;
-        if (i < size)
+        if (i < len)
             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)
+        if (i > len)
             p[3] = '=';
-        if (i > size + 1)
+        if (i > len + 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 {
-            int lpos = pos(token[i]);
-            if (lpos < 0)
-                return DECODE_ERROR;
-            val += lpos;
-        }
-    }
-
-    if (marker > 2)
-        return DECODE_ERROR;
-
-    return (marker << 24) | val;
-}
-
-int pa_base64_decode(const char *str, void *data) {
+int pa_raop_base64_decode(const char *str, void *data) {
     const char *p;
     unsigned char *q;
 
+    pa_assert(str);
+    pa_assert(data);
+
     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)
+        if (val == BASE64_DECODE_ERROR)
             return -1;
         *q++ = (val >> 16) & 0xff;
         if (marker < 2)

src/modules/raop/raop_util.h

@@ -1,11 +1,12 @@
-#ifndef foobase64hfoo
-#define foobase64hfoo
+#ifndef fooraoputilfoo
+#define fooraoputilfoo
 
 /***
   This file is part of PulseAudio.
 
   Copyright 2008 Colin Guthrie
   Copyright Kungliga Tekniska högskolan
+  Copyright 2013 Martin Blanchard
 
   PulseAudio is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published
@@ -23,10 +24,10 @@
 
 /***
   This file was originally inspired by a file developed by
-  Kungliga Tekniska högskolan
+  Kungliga Tekniska högskolan.
 ***/
 
-int pa_base64_encode(const void *data, int size, char **str);
-int pa_base64_decode(const char *str, void *data);
+int pa_raop_base64_encode(const void *data, int len, char **str);
+int pa_raop_base64_decode(const char *str, void *data);
 
 #endif