Added some utility methods to make parsing easier

.cproject

@@ -53,7 +53,6 @@
 		<buildTargets>
 			<target name="all" path="" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
 				<buildCommand>make</buildCommand>
-				<buildArguments/>
 				<buildTarget>all</buildTarget>
 				<stopOnError>true</stopOnError>
 				<useDefaultCommand>false</useDefaultCommand>
@@ -61,12 +60,19 @@
 			</target>
 			<target name="clean" path="" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
 				<buildCommand>make</buildCommand>
-				<buildArguments/>
 				<buildTarget>clean</buildTarget>
 				<stopOnError>true</stopOnError>
 				<useDefaultCommand>false</useDefaultCommand>
 				<runAllBuilders>true</runAllBuilders>
 			</target>
+			<target name="rebuild" path="" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
+				<buildCommand>make</buildCommand>
+				<buildArguments/>
+				<buildTarget>rebuild</buildTarget>
+				<stopOnError>true</stopOnError>
+				<useDefaultCommand>true</useDefaultCommand>
+				<runAllBuilders>true</runAllBuilders>
+			</target>
 		</buildTargets>
 	</storageModule>
 </cproject>

Makefile

@@ -28,4 +28,6 @@ all: test_multiaddr
 clean:
 	rm -f *.o
 	rm -f libmultiaddr.a
-	rm -f test_multiaddr
+	rm -f test_multiaddr
+	
+rebuild: clean all

include/multiaddr/multiaddr.h

@@ -50,8 +50,34 @@ void multiaddress_free(struct MultiAddress* in);
 
 struct MultiAddress* multiaddress_copy(const struct MultiAddress* source);
 
+// helpers to parse the MultiAddress struct
+
 int multiaddress_encapsulate(struct MultiAddress * result, char * string);
 
 int multiaddress_decapsulate(struct MultiAddress * result, char * srci);
 
+int multiaddress_is_ip(struct MultiAddress* in);
+
+int multiaddress_is_ip4(struct MultiAddress* in);
+
+int multiaddress_is_ip6(struct MultiAddress* in);
+
+int multiaddress_get_ip_family(struct MultiAddress* in);
+
+/***
+ * Pulls the textual representation of the IP address from a multihash
+ * @param in the multihash to parse
+ * @param ip where to put the ip address
+ * @returns true(1) on success, otherwise 0
+ */
+int multiaddress_get_ip_address(struct MultiAddress* in, char** ip);
+
+/***
+ * Pulls the IP port from a multiaddress
+ * @param in the multiaddress
+ * @param port where to put the port
+ * @returns the port, or a negative number for an error
+ */
+int multiaddress_get_ip_port(struct MultiAddress* in);
+
 #endif

multiaddr.c

@@ -1,4 +1,6 @@
 #include <string.h>
+#include <sys/socket.h>
+
 #include "multiaddr/varhexutils.h"
 #include "multiaddr/varint.h"
 #include "multiaddr/protocols.h"
@@ -81,6 +83,78 @@ struct MultiAddress* multiaddress_new_from_string(const char* straddress)//Const
 	return out;
 }
 
+int multiaddress_is_ip(struct MultiAddress* in) {
+	int byte = in->bytes[0];
+
+	if (byte == 4 || byte == 41)
+		return 1;
+	return 0;
+}
+int multiaddress_is_ip4(struct MultiAddress* in) {
+	return in->bytes[0] == 4;
+}
+
+int multiaddress_is_ip6(struct MultiAddress* in) {
+	return in->bytes[0] == 41;
+}
+
+
+int multiaddress_get_ip_family(struct MultiAddress* in) {
+	if (in->bytes[0] == 4)
+		return AF_INET;
+	if (in->bytes[0] == 41)
+		return AF_INET6;
+	return 0;
+}
+
+/***
+ * Pulls the textual representation of the IP address from a multihash
+ * @param in the multihash to parse
+ * @param ip where to put the ip address
+ * @returns true(1) on success, otherwise 0
+ */
+int multiaddress_get_ip_address(struct MultiAddress* in, char** ip) {
+	// the incoming address is not what was expected
+	if (strncmp(in->string, "/ip4/", 5) != 0 && strncmp(in->string, "/ip6/", 5) != 0)
+		return 0;
+	if (strstr(in->string, "/tcp/") == NULL && strstr(in->string, "/udp/") != NULL)
+		return 0;
+	// ip
+	char* str = malloc(strlen(in->string));
+	if (str == NULL)
+		return 0;
+	strcpy(str, &in->string[5]); // gets rid of /ip4/
+	char* pos = strchr(str, '/');
+	pos[0] = 0;
+	*ip = malloc(strlen(str) + 1);
+	strcpy(*ip, str);
+	free(str);
+	return 0;
+}
+
+/***
+ * Pulls the IP port from a multiaddress
+ * @param in the multiaddress
+ * @param port where to put the port
+ * @returns the port, or a negative number for an error
+ */
+int multiaddress_get_ip_port(struct MultiAddress* in) {
+	char* ptr = strstr(in->string, "/tcp/");
+	if (ptr == NULL)
+		ptr = strstr(in->string, "/udp/");
+	if (ptr == NULL)
+		return -1;
+	ptr += 5;
+	char* end_ptr = strstr(ptr, "/");
+	if (end_ptr == NULL) {
+		return atoi(ptr);
+	}
+	char str[end_ptr - ptr + 1];
+	memcpy(str, ptr, end_ptr - ptr);
+	str[end_ptr-ptr] = '\0';
+	return atoi(str);
+}
+
 void multiaddress_free(struct MultiAddress* in) {
 	if (in != NULL) {
 		if (in->bytes != NULL)

test_multiaddr.h

@@ -68,3 +68,27 @@ int test_int_to_hex() {
 	return 1;
 }
 
+int test_multiaddr_utils() {
+	struct MultiAddress* addr = multiaddress_new_from_string("/ip4/127.0.0.1/tcp/4001");
+	if (!multiaddress_is_ip(addr)) {
+		fprintf(stderr, "The address should be an IP\n");
+		return 0;
+	}
+	char* ip = NULL;
+	multiaddress_get_ip_address(addr, &ip);
+	if (ip == NULL) {
+		fprintf(stderr, "get_ip_address returned NULL\n");
+		return 0;
+	}
+	if(strcmp(ip, "127.0.0.1") != 0) {
+		fprintf(stderr, "ip addresses are not equal\n");
+		return 0;
+	}
+	int port = multiaddress_get_ip_port(addr);
+	if (port != 4001) {
+		fprintf(stderr, "port incorrect. %d was returned instead of %d\n", port, 4001);
+		return 0;
+	}
+	return 1;
+}
+

testing.c

@@ -6,14 +6,16 @@ const char* names[] = {
 		"test_new_from_string",
 		"test_full",
 		"test_hex_to_var",
-		"test_int_to_hex"
+		"test_int_to_hex",
+		"test_multiaddr_utils"
 };
 
 int (*funcs[])(void) = {
 		test_new_from_string,
 		test_full,
 		test_hex_to_var,
-		test_int_to_hex
+		test_int_to_hex,
+		test_multiaddr_utils
 };
 
 int testit(const char* name, int (*func)(void)) {