From 10a5d1be3a2503c5f31256c797cd53ff721e77d5 Mon Sep 17 00:00:00 2001
From: dengert <dengert@c6295689-39f2-0310-b995-f0e70906c6a9>
Date: Wed, 22 Sep 2010 14:55:03 +0000
Subject: [PATCH] Fix #257 Reading partial objects differs for T=0 vs T=1

git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@4761 c6295689-39f2-0310-b995-f0e70906c6a9
---
 src/libopensc/apdu.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/libopensc/apdu.c b/src/libopensc/apdu.c
index 6312284c..58736ad5 100644
--- a/src/libopensc/apdu.c
+++ b/src/libopensc/apdu.c
@@ -473,7 +473,11 @@ static int do_single_transmit(sc_card_t *card, sc_apdu_t *apdu)
 			/* 0x6100 means at least 256 more bytes to read */
 			le = apdu->sw2 != 0 ? (size_t)apdu->sw2 : 256;
 			/* we try to read at least as much as bytes as 
-			 * promised in the response bytes */
+			 * promised in the response bytes, but not more then
+			 * then requested. So now T=0 responds the same as T=1
+			 */
+			if (buflen < le) 
+				le = buflen;
 			minlen = le;
 
 			do {
@@ -492,6 +496,11 @@ static int do_single_transmit(sc_card_t *card, sc_apdu_t *apdu)
 				buf    += le;
 				buflen -= le;
 
+				/* we have all the data the caller requested 
+				 * even if the card has more data */
+				if (buflen == 0)
+					break;
+
 				minlen -= le;
 				if (r != 0) 
 					le = minlen = (size_t)r;