net: move `gitno` buffer to `staticstr`

The `gitno` buffer interface is another layer on top of socket reads.
Abstract it a bit into a "static string" that has `git_str` like
semantics but without heap allocation which moves the actual reading
logic into the socket / stream code, and allows for easier future usage
of a static / stack-allocated `git_str`-like interface.

22 files changed, 151 insertions, 237 deletions

diff --git a/src/libgit2/fetch.c b/src/libgit2/fetch.c
index 5bbef87f4..d74abb4a8 100644
--- a/src/libgit2/fetch.c
+++ b/src/libgit2/fetch.c
@@ -17,7 +17,6 @@
 #include "remote.h"
 #include "refspec.h"
 #include "pack.h"
-#include "netops.h"
 #include "repository.h"
 #include "refs.h"
 #include "transports/smart.h"
diff --git a/src/libgit2/fetch.h b/src/libgit2/fetch.h
index 10b6731f0..493366ded 100644
--- a/src/libgit2/fetch.h
+++ b/src/libgit2/fetch.h
@@ -11,8 +11,6 @@
 
 #include "git2/remote.h"
 
-#include "netops.h"
-
 int git_fetch_negotiate(git_remote *remote, const git_fetch_options *opts);
 
 int git_fetch_download_pack(git_remote *remote);
diff --git a/src/libgit2/netops.c b/src/libgit2/netops.c
deleted file mode 100644
index 5cae374ad..000000000
--- a/src/libgit2/netops.c
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * 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 "netops.h"
-
-#include <ctype.h>
-#include "git2/errors.h"
-
-#include "posix.h"
-#include "str.h"
-#include "runtime.h"
-
-int gitno_recv(gitno_buffer *buf)
-{
-	return buf->recv(buf);
-}
-
-void gitno_buffer_setup_callback(
-	gitno_buffer *buf,
-	char *data,
-	size_t len,
-	int (*recv)(gitno_buffer *buf), void *cb_data)
-{
-	memset(data, 0x0, len);
-	buf->data = data;
-	buf->len = len;
-	buf->offset = 0;
-	buf->recv = recv;
-	buf->cb_data = cb_data;
-}
-
-static int recv_stream(gitno_buffer *buf)
-{
-	git_stream *io = (git_stream *) buf->cb_data;
-	size_t readlen = buf->len - buf->offset;
-	ssize_t ret;
-
-	readlen = min(readlen, INT_MAX);
-
-	ret = git_stream_read(io, buf->data + buf->offset, (int)readlen);
-	if (ret < 0)
-		return -1;
-
-	buf->offset += ret;
-	return (int)ret;
-}
-
-void gitno_buffer_setup_fromstream(git_stream *st, gitno_buffer *buf, char *data, size_t len)
-{
-	memset(data, 0x0, len);
-	buf->data = data;
-	buf->len = len;
-	buf->offset = 0;
-	buf->recv = recv_stream;
-	buf->cb_data = st;
-}
-
-/* Consume up to ptr and move the rest of the buffer to the beginning */
-int gitno_consume(gitno_buffer *buf, const char *ptr)
-{
-	size_t consumed;
-
-	GIT_ASSERT(ptr - buf->data >= 0);
-	GIT_ASSERT(ptr - buf->data <= (int) buf->len);
-
-	consumed = ptr - buf->data;
-
-	memmove(buf->data, ptr, buf->offset - consumed);
-	memset(buf->data + buf->offset, 0x0, buf->len - buf->offset);
-	buf->offset -= consumed;
-
-	return 0;
-}
-
-/* Consume const bytes and move the rest of the buffer to the beginning */
-void gitno_consume_n(gitno_buffer *buf, size_t cons)
-{
-	memmove(buf->data, buf->data + cons, buf->len - buf->offset);
-	memset(buf->data + cons, 0x0, buf->len - buf->offset);
-	buf->offset -= cons;
-}
diff --git a/src/libgit2/netops.h b/src/libgit2/netops.h
deleted file mode 100644
index a3f4a0f95..000000000
--- a/src/libgit2/netops.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * 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_netops_h__
-#define INCLUDE_netops_h__
-
-#include "common.h"
-
-#include "posix.h"
-#include "stream.h"
-#include "net.h"
-
-#ifdef GIT_OPENSSL
-# include "streams/openssl.h"
-#endif
-
-typedef struct gitno_ssl {
-#ifdef GIT_OPENSSL
-	SSL *ssl;
-#else
-	size_t dummy;
-#endif
-} gitno_ssl;
-
-/* Represents a socket that may or may not be using SSL */
-typedef struct gitno_socket {
-	GIT_SOCKET socket;
-	gitno_ssl ssl;
-} gitno_socket;
-
-typedef struct gitno_buffer {
-	char *data;
-	size_t len;
-	size_t offset;
-	int (*recv)(struct gitno_buffer *buffer);
-	void *cb_data;
-} gitno_buffer;
-
-/* Flags to gitno_connect */
-enum {
-	/* Attempt to create an SSL connection. */
-	GITNO_CONNECT_SSL = 1
-};
-
-void gitno_buffer_setup_fromstream(git_stream *st, gitno_buffer *buf, char *data, size_t len);
-void gitno_buffer_setup_callback(gitno_buffer *buf, char *data, size_t len, int (*recv)(gitno_buffer *buf), void *cb_data);
-int gitno_recv(gitno_buffer *buf);
-
-int gitno_consume(gitno_buffer *buf, const char *ptr);
-void gitno_consume_n(gitno_buffer *buf, size_t cons);
-
-#endif
diff --git a/src/libgit2/pack-objects.c b/src/libgit2/pack-objects.c
index fc8efc65f..b2d80cba9 100644
--- a/src/libgit2/pack-objects.c
+++ b/src/libgit2/pack-objects.c
@@ -11,7 +11,6 @@
 #include "zstream.h"
 #include "delta.h"
 #include "iterator.h"
-#include "netops.h"
 #include "pack.h"
 #include "thread.h"
 #include "tree.h"
diff --git a/src/libgit2/pack-objects.h b/src/libgit2/pack-objects.h
index 0ceebc23c..bbc8b9430 100644
--- a/src/libgit2/pack-objects.h
+++ b/src/libgit2/pack-objects.h
@@ -13,7 +13,6 @@
 #include "str.h"
 #include "hash.h"
 #include "oidmap.h"
-#include "netops.h"
 #include "zstream.h"
 #include "pool.h"
 #include "indexer.h"
diff --git a/src/libgit2/streams/mbedtls.c b/src/libgit2/streams/mbedtls.c
index 0cf5c8af1..49aa76c3e 100644
--- a/src/libgit2/streams/mbedtls.c
+++ b/src/libgit2/streams/mbedtls.c
@@ -14,7 +14,6 @@
 #include "runtime.h"
 #include "stream.h"
 #include "streams/socket.h"
-#include "netops.h"
 #include "git2/transport.h"
 #include "util.h"
 
diff --git a/src/libgit2/streams/openssl.c b/src/libgit2/streams/openssl.c
index 58b2d1b23..9db911e39 100644
--- a/src/libgit2/streams/openssl.c
+++ b/src/libgit2/streams/openssl.c
@@ -20,7 +20,6 @@
 #include "stream.h"
 #include "net.h"
 #include "streams/socket.h"
-#include "netops.h"
 #include "git2/transport.h"
 #include "git2/sys/openssl.h"
 
@@ -71,14 +70,14 @@ static void *git_openssl_malloc(size_t bytes, const char *file, int line)
 	GIT_UNUSED(line);
 	return git__calloc(1, bytes);
 }
- 
+
 static void *git_openssl_realloc(void *mem, size_t size, const char *file, int line)
 {
 	GIT_UNUSED(file);
 	GIT_UNUSED(line);
 	return git__realloc(mem, size);
 }
- 
+
 static void git_openssl_free(void *mem, const char *file, int line)
 {
 	GIT_UNUSED(file);
diff --git a/src/libgit2/streams/socket.c b/src/libgit2/streams/socket.c
index 8f23e746e..6994d58f2 100644
--- a/src/libgit2/streams/socket.c
+++ b/src/libgit2/streams/socket.c
@@ -8,7 +8,6 @@
 #include "streams/socket.h"
 
 #include "posix.h"
-#include "netops.h"
 #include "registry.h"
 #include "runtime.h"
 #include "stream.h"
diff --git a/src/libgit2/streams/socket.h b/src/libgit2/streams/socket.h
index 300e70893..73e8de099 100644
--- a/src/libgit2/streams/socket.h
+++ b/src/libgit2/streams/socket.h
@@ -9,7 +9,7 @@
 
 #include "common.h"
 
-#include "netops.h"
+#include "stream.h"
 
 typedef struct {
 	git_stream parent;
diff --git a/src/libgit2/transports/auth.h b/src/libgit2/transports/auth.h
index 64680cc53..9f6f8fd3b 100644
--- a/src/libgit2/transports/auth.h
+++ b/src/libgit2/transports/auth.h
@@ -9,8 +9,7 @@
 #define INCLUDE_transports_auth_h__
 
 #include "common.h"
-
-#include "netops.h"
+#include "net.h"
 
 typedef enum {
 	GIT_HTTP_AUTH_BASIC = 1,
diff --git a/src/libgit2/transports/git.c b/src/libgit2/transports/git.c
index 591e2ab03..53611f2a7 100644
--- a/src/libgit2/transports/git.c
+++ b/src/libgit2/transports/git.c
@@ -7,7 +7,7 @@
 
 #include "common.h"
 
-#include "netops.h"
+#include "net.h"
 #include "stream.h"
 #include "streams/socket.h"
 #include "git2/sys/transport.h"
@@ -95,22 +95,21 @@ static int git_proto_stream_read(
 	size_t buf_size,
 	size_t *bytes_read)
 {
-	int error;
 	git_proto_stream *s = (git_proto_stream *)stream;
-	gitno_buffer buf;
+	ssize_t ret;
+	int error;
 
 	*bytes_read = 0;
 
 	if (!s->sent_command && (error = send_command(s)) < 0)
 		return error;
 
-	gitno_buffer_setup_fromstream(s->io, &buf, buffer, buf_size);
+	ret = git_stream_read(s->io, buffer, min(buf_size, INT_MAX));
 
-	if ((error = gitno_recv(&buf)) < 0)
-		return error;
-
-	*bytes_read = buf.offset;
+	if (ret < 0)
+		return -1;
 
+	*bytes_read = (size_t)ret;
 	return 0;
 }
 
diff --git a/src/libgit2/transports/http.c b/src/libgit2/transports/http.c
index cda76ae61..0534503bf 100644
--- a/src/libgit2/transports/http.c
+++ b/src/libgit2/transports/http.c
@@ -11,7 +11,6 @@
 
 #include "http_parser.h"
 #include "net.h"
-#include "netops.h"
 #include "remote.h"
 #include "smart.h"
 #include "auth.h"
diff --git a/src/libgit2/transports/smart.c b/src/libgit2/transports/smart.c
index a56524bff..537272828 100644
--- a/src/libgit2/transports/smart.c
+++ b/src/libgit2/transports/smart.c
@@ -13,30 +13,42 @@
 #include "refspec.h"
 #include "proxy.h"
 
-static int git_smart__recv_cb(gitno_buffer *buf)
+int git_smart__recv(transport_smart *t)
 {
-	transport_smart *t = (transport_smart *) buf->cb_data;
-	size_t old_len, bytes_read;
-	int error;
+	size_t bytes_read;
+	int ret;
 
+	GIT_ASSERT_ARG(t);
 	GIT_ASSERT(t->current_stream);
 
-	old_len = buf->offset;
+	if (git_staticstr_remain(&t->buffer) == 0) {
+		git_error_set(GIT_ERROR_NET, "out of buffer space");
+		return -1;
+	}
 
-	if ((error = t->current_stream->read(t->current_stream, buf->data + buf->offset, buf->len - buf->offset, &bytes_read)) < 0)
-		return error;
+	ret = t->current_stream->read(t->current_stream,
+		git_staticstr_offset(&t->buffer),
+		git_staticstr_remain(&t->buffer),
+		&bytes_read);
 
-	buf->offset += bytes_read;
+	if (ret < 0)
+		return ret;
+
+	GIT_ASSERT(bytes_read <= INT_MAX);
+	GIT_ASSERT(bytes_read <= git_staticstr_remain(&t->buffer));
+
+	git_staticstr_increase(&t->buffer, bytes_read);
 
 	if (t->packetsize_cb && !t->cancelled.val) {
-		error = t->packetsize_cb(bytes_read, t->packetsize_payload);
-		if (error) {
+		ret = t->packetsize_cb(bytes_read, t->packetsize_payload);
+
+		if (ret) {
 			git_atomic32_set(&t->cancelled, 1);
 			return GIT_EUSER;
 		}
 	}
 
-	return (int)(buf->offset - old_len);
+	return (int)bytes_read;
 }
 
 GIT_INLINE(int) git_smart__reset_stream(transport_smart *t, bool close_subtransport)
@@ -155,8 +167,6 @@ static int git_smart__connect(
 	/* Save off the current stream (i.e. socket) that we are working with */
 	t->current_stream = stream;
 
-	gitno_buffer_setup_callback(&t->buffer, t->buffer_data, sizeof(t->buffer_data), git_smart__recv_cb, t);
-
 	/* 2 flushes for RPC; 1 for stateful */
 	if ((error = git_smart__store_refs(t, t->rpc ? 2 : 1)) < 0)
 		return error;
@@ -313,8 +323,6 @@ int git_smart__negotiation_step(git_transport *transport, void *data, size_t len
 	if ((error = stream->write(stream, (const char *)data, len)) < 0)
 		return error;
 
-	gitno_buffer_setup_callback(&t->buffer, t->buffer_data, sizeof(t->buffer_data), git_smart__recv_cb, t);
-
 	return 0;
 }
 
@@ -339,8 +347,6 @@ int git_smart__get_push_stream(transport_smart *t, git_smart_subtransport_stream
 	/* Save off the current stream (i.e. socket) that we are working with */
 	t->current_stream = *stream;
 
-	gitno_buffer_setup_callback(&t->buffer, t->buffer_data, sizeof(t->buffer_data), git_smart__recv_cb, t);
-
 	return 0;
 }
 
@@ -502,20 +508,17 @@ int git_transport_smart(git_transport **out, git_remote *owner, void *param)
 	t->owner = owner;
 	t->rpc = definition->rpc;
 
-	if (git_vector_init(&t->refs, 16, ref_name_cmp) < 0) {
+	if (git_vector_init(&t->refs, 16, ref_name_cmp) < 0 ||
+	    git_vector_init(&t->heads, 16, ref_name_cmp) < 0 ||
+	    definition->callback(&t->wrapped, &t->parent, definition->param) < 0) {
+		git_vector_free(&t->refs);
+		git_vector_free(&t->heads);
+		t->wrapped->free(t->wrapped);
 		git__free(t);
 		return -1;
 	}
 
-	if (git_vector_init(&t->heads, 16, ref_name_cmp) < 0) {
-		git__free(t);
-		return -1;
-	}
-
-	if (definition->callback(&t->wrapped, &t->parent, definition->param) < 0) {
-		git__free(t);
-		return -1;
-	}
+	git_staticstr_init(&t->buffer, GIT_SMART_BUFFER_SIZE);
 
 	*out = (git_transport *) t;
 	return 0;
diff --git a/src/libgit2/transports/smart.h b/src/libgit2/transports/smart.h
index 34e27ea8e..52c7553a1 100644
--- a/src/libgit2/transports/smart.h
+++ b/src/libgit2/transports/smart.h
@@ -11,12 +11,14 @@
 
 #include "git2.h"
 #include "vector.h"
-#include "netops.h"
 #include "push.h"
 #include "str.h"
 #include "oidarray.h"
+#include "staticstr.h"
 #include "git2/sys/transport.h"
 
+#define GIT_SMART_BUFFER_SIZE  65536
+
 #define GIT_SIDE_BAND_DATA     1
 #define GIT_SIDE_BAND_PROGRESS 2
 #define GIT_SIDE_BAND_ERROR    3
@@ -170,8 +172,7 @@ typedef struct {
 	unsigned rpc : 1,
 	         have_refs : 1,
 	         connected : 1;
-	gitno_buffer buffer;
-	char buffer_data[65536];
+	git_staticstr_with_size(GIT_SMART_BUFFER_SIZE) buffer;
 } transport_smart;
 
 /* smart_protocol.c */
@@ -192,6 +193,8 @@ int git_smart__download_pack(
 	git_indexer_progress *stats);
 
 /* smart.c */
+int git_smart__recv(transport_smart *t);
+
 int git_smart__negotiation_step(git_transport *transport, void *data, size_t len);
 int git_smart__get_push_stream(transport_smart *t, git_smart_subtransport_stream **out);
 
diff --git a/src/libgit2/transports/smart_pkt.c b/src/libgit2/transports/smart_pkt.c
index 9127ad5fe..7805f3323 100644
--- a/src/libgit2/transports/smart_pkt.c
+++ b/src/libgit2/transports/smart_pkt.c
@@ -9,7 +9,6 @@
 
 #include "smart.h"
 #include "util.h"
-#include "netops.h"
 #include "posix.h"
 #include "str.h"
 #include "oid.h"
diff --git a/src/libgit2/transports/smart_protocol.c b/src/libgit2/transports/smart_protocol.c
index f7a567829..c9c422d4c 100644
--- a/src/libgit2/transports/smart_protocol.c
+++ b/src/libgit2/transports/smart_protocol.c
@@ -27,7 +27,6 @@ bool git_smart__ofs_delta_enabled = true;
 
 int git_smart__store_refs(transport_smart *t, int flushes)
 {
-	gitno_buffer *buf = &t->buffer;
 	git_vector *refs = &t->refs;
 	int error, flush = 0, recvd;
 	const char *line_end = NULL;
@@ -45,8 +44,10 @@ int git_smart__store_refs(transport_smart *t, int flushes)
 	pkt = NULL;
 
 	do {
-		if (buf->offset > 0)
-			error = git_pkt_parse_line(&pkt, &line_end, buf->data, buf->offset, &pkt_parse_data);
+		if (t->buffer.len > 0)
+			error = git_pkt_parse_line(&pkt, &line_end,
+				t->buffer.data, t->buffer.len,
+				&pkt_parse_data);
 		else
 			error = GIT_EBUFS;
 
@@ -54,7 +55,7 @@ int git_smart__store_refs(transport_smart *t, int flushes)
 			return error;
 
 		if (error == GIT_EBUFS) {
-			if ((recvd = gitno_recv(buf)) < 0)
+			if ((recvd = git_smart__recv(t)) < 0)
 				return recvd;
 
 			if (recvd == 0) {
@@ -65,8 +66,7 @@ int git_smart__store_refs(transport_smart *t, int flushes)
 			continue;
 		}
 
-		if (gitno_consume(buf, line_end) < 0)
-			return -1;
+		git_staticstr_consume(&t->buffer, line_end);
 
 		if (pkt->type == GIT_PKT_ERR) {
 			git_error_set(GIT_ERROR_NET, "remote error: %s", ((git_pkt_err *)pkt)->error);
@@ -259,10 +259,9 @@ int git_smart__detect_caps(
 static int recv_pkt(
 	git_pkt **out_pkt,
 	git_pkt_type *out_type,
-	transport_smart *t,
-	gitno_buffer *buf)
+	transport_smart *t)
 {
-	const char *ptr = buf->data, *line_end = ptr;
+	const char *ptr = t->buffer.data, *line_end = ptr;
 	git_pkt *pkt = NULL;
 	git_pkt_parse_data pkt_parse_data = { 0 };
 	int error = 0, ret;
@@ -271,8 +270,9 @@ static int recv_pkt(
 	pkt_parse_data.seen_capabilities = 1;
 
 	do {
-		if (buf->offset > 0)
-			error = git_pkt_parse_line(&pkt, &line_end, ptr, buf->offset, &pkt_parse_data);
+		if (t->buffer.len > 0)
+			error = git_pkt_parse_line(&pkt, &line_end, ptr,
+				t->buffer.len, &pkt_parse_data);
 		else
 			error = GIT_EBUFS;
 
@@ -282,7 +282,7 @@ static int recv_pkt(
 		if (error < 0 && error != GIT_EBUFS)
 			return error;
 
-		if ((ret = gitno_recv(buf)) < 0) {
+		if ((ret = git_smart__recv(t)) < 0) {
 			return ret;
 		} else if (ret == 0) {
 			git_error_set(GIT_ERROR_NET, "early EOF");
@@ -290,8 +290,7 @@ static int recv_pkt(
 		}
 	} while (error);
 
-	if (gitno_consume(buf, line_end) < 0)
-		return -1;
+	git_staticstr_consume(&t->buffer, line_end);
 
 	if (out_type != NULL)
 		*out_type = pkt->type;
@@ -306,11 +305,10 @@ static int recv_pkt(
 static int store_common(transport_smart *t)
 {
 	git_pkt *pkt = NULL;
-	gitno_buffer *buf = &t->buffer;
 	int error;
 
 	do {
-		if ((error = recv_pkt(&pkt, NULL, t, buf)) < 0)
+		if ((error = recv_pkt(&pkt, NULL, t)) < 0)
 			return error;
 
 		if (pkt->type != GIT_PKT_ACK) {
@@ -327,7 +325,7 @@ static int store_common(transport_smart *t)
 	return 0;
 }
 
-static int wait_while_ack(transport_smart *t, gitno_buffer *buf)
+static int wait_while_ack(transport_smart *t)
 {
 	int error;
 	git_pkt *pkt = NULL;
@@ -336,7 +334,7 @@ static int wait_while_ack(transport_smart *t, gitno_buffer *buf)
 	while (1) {
 		git_pkt_free(pkt);
 
-		if ((error = recv_pkt(&pkt, NULL, t, buf)) < 0)
+		if ((error = recv_pkt(&pkt, NULL, t)) < 0)
 			return error;
 
 		if (pkt->type == GIT_PKT_NAK)
@@ -402,7 +400,6 @@ int git_smart__negotiate_fetch(
 {
 	transport_smart *t = (transport_smart *)transport;
 	git_revwalk__push_options opts = GIT_REVWALK__PUSH_OPTIONS_INIT;
-	gitno_buffer *buf = &t->buffer;
 	git_str data = GIT_STR_INIT;
 	git_revwalk *walk = NULL;
 	int error = -1;
@@ -430,7 +427,7 @@ int git_smart__negotiate_fetch(
 		if ((error = git_smart__negotiation_step(&t->parent, data.ptr, data.size)) < 0)
 			goto on_error;
 
-		while ((error = recv_pkt((git_pkt **)&pkt, NULL, t, buf)) == 0) {
+		while ((error = recv_pkt((git_pkt **)&pkt, NULL, t)) == 0) {
 			bool complete = false;
 
 			if (pkt->type == GIT_PKT_SHALLOW) {
@@ -495,7 +492,7 @@ int git_smart__negotiate_fetch(
 				if ((error = store_common(t)) < 0)
 					goto on_error;
 			} else {
-				if ((error = recv_pkt(NULL, &pkt_type, t, buf)) < 0)
+				if ((error = recv_pkt(NULL, &pkt_type, t)) < 0)
 					goto on_error;
 
 				if (pkt_type == GIT_PKT_ACK) {
@@ -568,7 +565,7 @@ int git_smart__negotiate_fetch(
 
 	/* Now let's eat up whatever the server gives us */
 	if (!t->caps.multi_ack && !t->caps.multi_ack_detailed) {
-		if ((error = recv_pkt(NULL, &pkt_type, t, buf)) < 0)
+		if ((error = recv_pkt(NULL, &pkt_type, t)) < 0)
 			return error;
 
 		if (pkt_type != GIT_PKT_ACK && pkt_type != GIT_PKT_NAK) {
@@ -576,7 +573,7 @@ int git_smart__negotiate_fetch(
 			return -1;
 		}
 	} else {
-		error = wait_while_ack(t, buf);
+		error = wait_while_ack(t);
 	}
 
 	return error;
@@ -606,7 +603,10 @@ int git_smart__shallow_roots(git_oidarray *out, git_transport *transport)
 	return 0;
 }
 
-static int no_sideband(transport_smart *t, struct git_odb_writepack *writepack, gitno_buffer *buf, git_indexer_progress *stats)
+static int no_sideband(
+	transport_smart *t,
+	struct git_odb_writepack *writepack,
+	git_indexer_progress *stats)
 {
 	int recvd;
 
@@ -616,12 +616,12 @@ static int no_sideband(transport_smart *t, struct git_odb_writepack *writepack,
 			return GIT_EUSER;
 		}
 
-		if (writepack->append(writepack, buf->data, buf->offset, stats) < 0)
+		if (writepack->append(writepack, t->buffer.data, t->buffer.len, stats) < 0)
 			return -1;
 
-		gitno_consume_n(buf, buf->offset);
+		git_staticstr_clear(&t->buffer);
 
-		if ((recvd = gitno_recv(buf)) < 0)
+		if ((recvd = git_smart__recv(t)) < 0)
 			return recvd;
 	} while(recvd > 0);
 
@@ -663,7 +663,6 @@ int git_smart__download_pack(
 	git_indexer_progress *stats)
 {
 	transport_smart *t = (transport_smart *)transport;
-	gitno_buffer *buf = &t->buffer;
 	git_odb *odb;
 	struct git_odb_writepack *writepack = NULL;
 	int error = 0;
@@ -682,9 +681,10 @@ int git_smart__download_pack(
 		t->packetsize_payload = &npp;
 
 		/* We might have something in the buffer already from negotiate_fetch */
-		if (t->buffer.offset > 0 && !t->cancelled.val)
-			if (t->packetsize_cb(t->buffer.offset, t->packetsize_payload))
+		if (t->buffer.len > 0 && !t->cancelled.val) {
+			if (t->packetsize_cb(t->buffer.len, t->packetsize_payload))
 				git_atomic32_set(&t->cancelled, 1);
+		}
 	}
 
 	if ((error = git_repository_odb__weakptr(&odb, repo)) < 0 ||
@@ -697,7 +697,7 @@ int git_smart__download_pack(
 	 * check which one belongs there.
 	 */
 	if (!t->caps.side_band && !t->caps.side_band_64k) {
-		error = no_sideband(t, writepack, buf, stats);
+		error = no_sideband(t, writepack, stats);
 		goto done;
 	}
 
@@ -711,7 +711,7 @@ int git_smart__download_pack(
 			goto done;
 		}
 
-		if ((error = recv_pkt(&pkt, NULL, t, buf)) >= 0) {
+		if ((error = recv_pkt(&pkt, NULL, t)) >= 0) {
 			/* Check cancellation after network call */
 			if (t->cancelled.val) {
 				git_error_clear();
@@ -916,15 +916,15 @@ static int parse_report(transport_smart *transport, git_push *push)
 	git_pkt *pkt = NULL;
 	git_pkt_parse_data pkt_parse_data = { 0 };
 	const char *line_end = NULL;
-	gitno_buffer *buf = &transport->buffer;
 	int error, recvd;
 	git_str data_pkt_buf = GIT_STR_INIT;
 
 	for (;;) {
-		if (buf->offset > 0)
+		if (transport->buffer.len > 0)
 			error = git_pkt_parse_line(&pkt, &line_end,
-						   buf->data, buf->offset,
-						   &pkt_parse_data);
+				   transport->buffer.data,
+				   transport->buffer.len,
+				   &pkt_parse_data);
 		else
 			error = GIT_EBUFS;
 
@@ -934,7 +934,7 @@ static int parse_report(transport_smart *transport, git_push *push)
 		}
 
 		if (error == GIT_EBUFS) {
-			if ((recvd = gitno_recv(buf)) < 0) {
+			if ((recvd = git_smart__recv(transport)) < 0) {
 				error = recvd;
 				goto done;
 			}
@@ -947,9 +947,7 @@ static int parse_report(transport_smart *transport, git_push *push)
 			continue;
 		}
 
-		if (gitno_consume(buf, line_end) < 0)
-			return -1;
-
+		git_staticstr_consume(&transport->buffer, line_end);
 		error = 0;
 
 		switch (pkt->type) {
diff --git a/src/libgit2/transports/ssh.c b/src/libgit2/transports/ssh.c
index 5500ea100..af618e1a6 100644
--- a/src/libgit2/transports/ssh.c
+++ b/src/libgit2/transports/ssh.c
@@ -13,7 +13,6 @@
 
 #include "runtime.h"
 #include "net.h"
-#include "netops.h"
 #include "smart.h"
 #include "streams/socket.h"
 #include "sysdir.h"
diff --git a/src/libgit2/transports/winhttp.c b/src/libgit2/transports/winhttp.c
index de24a2a41..27e0fb6f7 100644
--- a/src/libgit2/transports/winhttp.c
+++ b/src/libgit2/transports/winhttp.c
@@ -13,7 +13,6 @@
 #include "git2/transport.h"
 #include "posix.h"
 #include "str.h"
-#include "netops.h"
 #include "smart.h"
 #include "remote.h"
 #include "repository.h"
diff --git a/src/util/staticstr.h b/src/util/staticstr.h
new file mode 100644
index 000000000..b7d0790c4
--- /dev/null
+++ b/src/util/staticstr.h
@@ -0,0 +1,66 @@
+/*
+ * 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_stackstr_h__
+#define INCLUDE_stackstr_h__
+
+#include "git2_util.h"
+
+typedef struct {
+	/* Length of / number of bytes used by `data`. */
+	size_t len;
+
+	/* Size of the allocated `data` buffer. */
+	size_t size;
+
+	/* The actual string buffer data. */
+	char data[GIT_FLEX_ARRAY];
+} git_staticstr;
+
+#define git_staticstr_with_size(__size) \
+	struct { \
+		size_t len; \
+		size_t size; \
+		char data[__size]; \
+	}
+
+#define git_staticstr_init(__str, __size) \
+	do { \
+		(__str)->len = 0; \
+		(__str)->size = __size; \
+		(__str)->data[0] = '\0'; \
+	} while(0)
+
+#define git_staticstr_offset(__str) \
+	((__str)->data + (__str)->len)
+
+#define git_staticstr_remain(__str) \
+	((__str)->len > (__str)->size ? 0 : ((__str)->size - (__str)->len))
+
+#define git_staticstr_increase(__str, __len) \
+	do { ((__str)->len += __len); } while(0)
+
+#define git_staticstr_consume_bytes(__str, __len) \
+	do { git_staticstr_consume(__str, (__str)->data + __len); } while(0)
+
+#define git_staticstr_consume(__str, __end) \
+	do { \
+		if (__end > (__str)->data && \
+		    __end <= (__str)->data + (__str)->len) { \
+			size_t __consumed = __end - (__str)->data; \
+			memmove((__str)->data, __end, (__str)->len - __consumed); \
+			(__str)->len -= __consumed; \
+			(__str)->data[(__str)->len] = '\0'; \
+		} \
+	} while(0)
+
+#define git_staticstr_clear(__str) \
+	do { \
+		(__str)->len = 0; \
+		(__str)->data[0] = 0; \
+	} while(0)
+
+#endif
diff --git a/tests/util/url/joinpath.c b/tests/util/url/joinpath.c
index 9fc02cde4..6027093e4 100644
--- a/tests/util/url/joinpath.c
+++ b/tests/util/url/joinpath.c
@@ -1,6 +1,5 @@
 #include "clar_libgit2.h"
 #include "net.h"
-#include "netops.h"
 
 static git_net_url source, target;
 
diff --git a/tests/util/url/redirect.c b/tests/util/url/redirect.c
index 540177861..a6f99dcdf 100644
--- a/tests/util/url/redirect.c
+++ b/tests/util/url/redirect.c
@@ -1,6 +1,5 @@
 #include "clar_libgit2.h"
 #include "net.h"
-#include "netops.h"
 
 static git_net_url conndata;