From ce815ef2a2b6f5880a40c9783ef906eaa994a089 Mon Sep 17 00:00:00 2001
From: Marcus Meissner <marcus@jet.franken.de>
Date: Wed, 17 Sep 2014 14:40:07 +0000
Subject: [PATCH] also allow partial data sent to handler for libmtp

git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@15185 67ed7778-7388-44ab-90cf-0a291f65f57c
---
 camlibs/ptp2/ptp.c | 23 +++++++++++++++++++++++
 camlibs/ptp2/ptp.h |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/camlibs/ptp2/ptp.c b/camlibs/ptp2/ptp.c
index 445e74a5c..69334048e 100644
--- a/camlibs/ptp2/ptp.c
+++ b/camlibs/ptp2/ptp.c
@@ -1446,6 +1446,29 @@ ptp_getpartialobject (PTPParams* params, uint32_t handle, uint32_t offset,
 	return ptp_transaction(params, &ptp, PTP_DP_GETDATA, 0, object, len);
 }
 
+/**
+ * ptp_getpartialobject_to_handler:
+ * params:	PTPParams*
+ *		handle			- Object handle
+ *		offset			- Offset into object
+ *		maxbytes		- Maximum of bytes to read
+ *		handler			- a ptp data handler
+ *
+ * Get object 'handle' from device and send the data to the
+ * data handler. Start from offset and read at most maxbytes.
+ *
+ * Return values: Some PTP_RC_* code.
+ **/
+uint16_t
+ptp_getpartialobject_to_handler (PTPParams* params, uint32_t handle, uint32_t offset,
+			uint32_t maxbytes, PTPDataHandler *handler)
+{
+	PTPContainer ptp;
+
+	PTP_CNT_INIT(ptp, PTP_OC_GetPartialObject, handle, offset, maxbytes);
+	return ptp_transaction_new(params, &ptp, PTP_DP_GETDATA, 0, handler);
+}
+
 /**
  * ptp_getthumb:
  * params:	PTPParams*
diff --git a/camlibs/ptp2/ptp.h b/camlibs/ptp2/ptp.h
index b8282fc10..754ce13ee 100644
--- a/camlibs/ptp2/ptp.h
+++ b/camlibs/ptp2/ptp.h
@@ -2523,6 +2523,9 @@ uint16_t ptp_getobject_to_handler (PTPParams* params, uint32_t handle, PTPDataHa
 uint16_t ptp_getpartialobject	(PTPParams* params, uint32_t handle, uint32_t offset,
 				uint32_t maxbytes, unsigned char** object,
 				uint32_t *len);
+uint16_t ptp_getpartialobject_to_handler (PTPParams* params, uint32_t handle, uint32_t offset,
+                        	uint32_t maxbytes, PTPDataHandler *handler);
+
 uint16_t ptp_getthumb		(PTPParams *params, uint32_t handle,
 				unsigned char** object, unsigned int *len);