thodg/libgit2

diff --git a/include/git2/sys/stream.h b/include/git2/sys/stream.h
new file mode 100644
index 0000000..69f8554
--- /dev/null
+++ b/include/git2/sys/stream.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_sys_git_stream_h__
+#define INCLUDE_sys_git_stream_h__
+
+#include "git2/common.h"
+#include "git2/types.h"
+
+GIT_BEGIN_DECL
+
+#define GIT_STREAM_VERSION 1
+
+/**
+ * Every stream must have this struct as its first element, so the
+ * API can talk to it. You'd define your stream as
+ *
+ *     struct my_stream {
+ *             git_stream parent;
+ *             ...
+ *     }
+ *
+ * and fill the functions
+ */
+typedef struct git_stream {
+	int version;
+
+	int encrypted;
+	int (*connect)(struct git_stream *);
+	int (*certificate)(git_cert **, struct git_stream *);
+	ssize_t (*read)(struct git_stream *, void *, size_t);
+	ssize_t (*write)(struct git_stream *, void *, size_t, int);
+	int (*close)(struct git_stream *);
+	void (*free)(struct git_stream *);
+} git_stream;
+
+#endif
diff --git a/src/socket_stream.c b/src/socket_stream.c
new file mode 100644
index 0000000..c182d6d
--- /dev/null
+++ b/src/socket_stream.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "common.h"
+#include "posix.h"
+#include "stream.h"
+#include "netops.h"
+
+#ifndef _WIN32
+#	include <sys/types.h>
+#	include <sys/socket.h>
+#	include <sys/select.h>
+#	include <sys/time.h>
+#	include <netdb.h>
+#	include <netinet/in.h>
+#       include <arpa/inet.h>
+#else
+#	include <winsock2.h>
+#	include <ws2tcpip.h>
+#	ifdef _MSC_VER
+#		pragma comment(lib, "ws2_32")
+#	endif
+#endif
+
+#ifdef GIT_WIN32
+static void net_set_error(const char *str)
+{
+	int error = WSAGetLastError();
+	char * win32_error = git_win32_get_error_message(error);
+
+	if (win32_error) {
+		giterr_set(GITERR_NET, "%s: %s", str, win32_error);
+		git__free(win32_error);
+	} else {
+		giterr_set(GITERR_NET, str);
+	}
+}
+#else
+static void net_set_error(const char *str)
+{
+	giterr_set(GITERR_NET, "%s: %s", str, strerror(errno));
+}
+#endif
+
+static int close_socket(GIT_SOCKET s)
+{
+	if (s == INVALID_SOCKET)
+		return 0;
+
+#ifdef GIT_WIN32
+	if (SOCKET_ERROR == closesocket(s))
+		return -1;
+
+	if (0 != WSACleanup()) {
+		giterr_set(GITERR_OS, "Winsock cleanup failed");
+		return -1;
+	}
+
+	return 0;
+#else
+	return close(s);
+#endif
+
+}
+
+typedef struct {
+	git_stream parent;
+	char *host;
+	char *port;
+	GIT_SOCKET s;
+} socket_stream;
+
+int socket_connect(git_stream *stream)
+{
+	struct addrinfo *info = NULL, *p;
+	struct addrinfo hints;
+	socket_stream *st = (socket_stream *) stream;
+	GIT_SOCKET s = INVALID_SOCKET;
+	int ret;
+
+#ifdef GIT_WIN32
+	/* on win32, the WSA context needs to be initialized
+	 * before any socket calls can be performed */
+	WSADATA wsd;
+
+	if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) {
+		giterr_set(GITERR_OS, "Winsock init failed");
+		return -1;
+	}
+
+	if (LOBYTE(wsd.wVersion) != 2 || HIBYTE(wsd.wVersion) != 2) {
+		WSACleanup();
+		giterr_set(GITERR_OS, "Winsock init failed");
+		return -1;
+	}
+#endif
+
+	memset(&hints, 0x0, sizeof(struct addrinfo));
+	hints.ai_socktype = SOCK_STREAM;
+	hints.ai_family = AF_UNSPEC;
+
+	if ((ret = p_getaddrinfo(st->host, st->port, &hints, &info)) != 0) {
+		giterr_set(GITERR_NET,
+
+			   "Failed to resolve address for %s: %s", st->host, p_gai_strerror(ret));
+		return -1;
+	}
+
+	for (p = info; p != NULL; p = p->ai_next) {
+		s = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
+
+		if (s == INVALID_SOCKET) {
+			net_set_error("error creating socket");
+			break;
+		}
+
+		if (connect(s, p->ai_addr, (socklen_t)p->ai_addrlen) == 0)
+			break;
+
+		/* If we can't connect, try the next one */
+		close_socket(s);
+		s = INVALID_SOCKET;
+	}
+
+	/* Oops, we couldn't connect to any address */
+	if (s == INVALID_SOCKET && p == NULL) {
+		giterr_set(GITERR_OS, "Failed to connect to %s", st->host);
+		p_freeaddrinfo(info);
+		return -1;
+	}
+
+	st->s = s;
+	p_freeaddrinfo(info);
+	return 0;
+}
+
+ssize_t socket_write(git_stream *stream, void *data, size_t len, int flags)
+{
+	ssize_t ret;
+	size_t off = 0;
+	socket_stream *st = (socket_stream *) stream;
+
+	while (off < len) {
+		errno = 0;
+		ret = p_send(st->s, data + off, len - off, flags);
+		if (ret < 0) {
+			net_set_error("Error sending data");
+			return -1;
+		}
+
+		off += ret;
+	}
+
+	return off;
+}
+
+ssize_t socket_read(git_stream *stream, void *data, size_t len)
+{
+	ssize_t ret;
+	socket_stream *st = (socket_stream *) stream;
+
+	if ((ret = p_recv(st->s, data, len, 0)) < 0)
+		net_set_error("Error receiving socket data");
+
+	return ret;
+}
+
+int socket_close(git_stream *stream)
+{
+	socket_stream *st = (socket_stream *) stream;
+	int error;
+
+	error = close_socket(st->s);
+	st->s = INVALID_SOCKET;
+
+	return error;
+}
+
+void socket_free(git_stream *stream)
+{
+	socket_stream *st = (socket_stream *) stream;
+
+	git__free(st->host);
+	git__free(st->port);
+	git__free(st);
+}
+
+int git_socket_stream_new(git_stream **out, const char *host, const char *port)
+{
+	socket_stream *st;
+
+	assert(out && host);
+
+	st = git__calloc(1, sizeof(socket_stream));
+	GITERR_CHECK_ALLOC(st);
+
+	st->host = git__strdup(host);
+	GITERR_CHECK_ALLOC(st->host);
+
+	if (port) {
+		st->port = git__strdup(port);
+		GITERR_CHECK_ALLOC(st->port);
+	}
+
+	st->parent.version = GIT_STREAM_VERSION;
+	st->parent.connect = socket_connect;
+	st->parent.write = socket_write;
+	st->parent.read = socket_read;
+	st->parent.close = socket_close;
+	st->parent.free = socket_free;
+	st->s = INVALID_SOCKET;
+
+	*out = (git_stream *) st;
+	return 0;
+}
diff --git a/src/stream.h b/src/stream.h
new file mode 100644
index 0000000..8eec830
--- /dev/null
+++ b/src/stream.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_stream_h__
+#define INCLUDE_stream_h__
+
+#include "common.h"
+#include "git2/sys/stream.h"
+
+GIT_INLINE(int) git_stream_connect(git_stream *st)
+{
+	return st->connect(st);
+}
+
+GIT_INLINE(int) git_stream_certificate(git_cert **out, git_stream *st)
+{
+	if (!st->encrypted) {
+		giterr_set(GITERR_INVALID, "an unencrypted stream does not have a certificate");
+		return -1;
+	}
+
+	return st->certificate(out, st);
+}
+
+GIT_INLINE(ssize_t) git_stream_read(git_stream *st, void *data, size_t len)
+{
+	return st->read(st, data, len);
+}
+
+GIT_INLINE(ssize_t) git_stream_write(git_stream *st, void *data, size_t len, int flags)
+{
+	return st->write(st, data, len, flags);
+}
+
+GIT_INLINE(int) git_stream_close(git_stream *st)
+{
+	return st->close(st);
+}
+
+GIT_INLINE(void) git_stream_free(git_stream *st)
+{
+	return st->free(st);
+}
+
+#endif