From 4ef448db24d0f17b2f4db358ef6896192ddbdeb2 Mon Sep 17 00:00:00 2001
From: Ulf Jaenicke-Roessler <ujr@insynergie.de>
Date: Sun, 24 Apr 2022 14:27:18 +0200
Subject: [PATCH 1/2] fix request start position for chunks larger than 31952
 bytes

---
 lib/protocol/SFTP.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/protocol/SFTP.js b/lib/protocol/SFTP.js
index a7fc4f90..9ea3ee0c 100644
--- a/lib/protocol/SFTP.js
+++ b/lib/protocol/SFTP.js
@@ -1986,6 +1986,7 @@ function read_(self, handle, buf, off, len, position, cb, req_) {
   const req = (req_ || {
     nb: 0,
     position,
+    origPosition: position,
     off,
     origOff: off,
     len: undefined,
@@ -2012,7 +2013,7 @@ function read_(self, handle, buf, off, len, position, cb, req_) {
         data = buf;
       else
         data = bufferSlice(buf, req.origOff, req.origOff + req.nb + nb);
-      cb(undefined, req.nb + nb, data, req.position);
+      cb(undefined, req.nb + nb, data, req.origPosition);
     },
     buffer: undefined,
   });

From c61cead286f9ef14f9be634753ff0b1903f6920a Mon Sep 17 00:00:00 2001
From: Ulf Jaenicke-Roessler <ujr@insynergie.de>
Date: Sun, 24 Apr 2022 16:40:42 +0200
Subject: [PATCH 2/2] add test for start position

---
 test/test-sftp.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/test-sftp.js b/test/test-sftp.js
index 1bda7668..65e33479 100644
--- a/test/test-sftp.js
+++ b/test/test-sftp.js
@@ -105,10 +105,12 @@ setup('read (overflow)', mustCall((client, server) => {
     if (reqs === 3)
       server.end();
   }, 3));
-  client.read(handle_, buf, 0, buf.length, 0, mustCall((err, nb) => {
+  let reqPos = 0
+  client.read(handle_, buf, 0, buf.length, reqPos, mustCall((err, nb, retBuf, retPos) => {
     assert(!err, `Unexpected read() error: ${err}`);
     assert.deepStrictEqual(buf, expected);
     assert.strictEqual(nb, buf.length, 'read nb mismatch');
+    assert.strictEqual(reqPos, retPos, 'read ressource position does not match request');
   }));
 }));