From ad2bab318ec1271ae520606259c962382a519f0d Mon Sep 17 00:00:00 2001
From: Felix Domke <tmbinc@elitedvb.net>
Date: Fri, 20 Jan 2006 23:39:33 +0000
Subject: [PATCH] filepush: scatter/gather support

---
 lib/base/filepush.cpp | 29 ++++++++++++++++++++++++++---
 lib/base/filepush.h   |  9 +++++++++
 2 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/lib/base/filepush.cpp b/lib/base/filepush.cpp
index 60dc78ee..b99896fc 100644
--- a/lib/base/filepush.cpp
+++ b/lib/base/filepush.cpp
@@ -10,6 +10,7 @@
 eFilePushThread::eFilePushThread(): m_messagepump(eApp, 0)
 {
 	m_stop = 0;
+	m_sg = 0;
 	flush();
 	enablePVRCommit(0);
 	CONNECT(m_messagepump.recv_msg, eFilePushThread::recvEvent);
@@ -22,6 +23,10 @@ static void signal_handler(int x)
 void eFilePushThread::thread()
 {
 	off_t dest_pos = 0;
+	size_t bytes_read = 0;
+	
+	off_t current_span_offset;
+	size_t current_span_remaining = 0;
 	
 	int already_empty = 0;
 	eDebug("FILEPUSH THREAD START");
@@ -59,10 +64,29 @@ void eFilePushThread::thread()
 			m_buf_start += w;
 			continue;
 		}
-			
+
 			/* now fill our buffer. */
+			
+		if (m_sg && !current_span_remaining)
+		{
+			m_sg->getNextSourceSpan(bytes_read, current_span_offset, current_span_remaining);
+			bytes_read = 0;
+		}
+		
+		size_t maxread = sizeof(m_buffer);
+		
+			/* if we have a source span, don't read past the end */
+		if (m_sg && maxread < current_span_remaining)
+			maxread = current_span_remaining;
+
 		m_buf_start = 0;
-		m_buf_end = read(m_fd_source, m_buffer, sizeof(m_buffer));
+		m_buf_end = 0;
+		
+		if (maxread)
+			m_buf_end = read(m_fd_source, m_buffer, maxread);
+
+		bytes_read += m_buf_end;
+
 		if (m_buf_end < 0)
 		{
 			m_buf_end = 0;
@@ -84,7 +108,6 @@ void eFilePushThread::thread()
 				continue;
 			}
 			sendEvent(evtEOF);
-
 #if 0
 			eDebug("FILEPUSH: end-of-file! (currently unhandled)");
 			if (!lseek(m_fd_source, 0, SEEK_SET))
diff --git a/lib/base/filepush.h b/lib/base/filepush.h
index f2bd98be..7e16fa02 100644
--- a/lib/base/filepush.h
+++ b/lib/base/filepush.h
@@ -6,6 +6,12 @@
 #include <lib/base/message.h>
 #include <sys/types.h>
 
+class iFilePushScatterGather
+{
+public:
+	virtual void getNextSourceSpan(size_t bytes_read, off_t &start, size_t &size)=0;
+};
+
 class eFilePushThread: public eThread, public Object
 {
 public:
@@ -22,10 +28,13 @@ public:
 	void flush();
 	void enablePVRCommit(int);
 	
+	void setSG(iFilePushScatterGather *);
+	
 	enum { evtEOF, evtReadError, evtWriteError };
 	Signal1<void,int> m_event;
 	
 private:
+	iFilePushScatterGather *m_sg;
 	int m_stop;
 	unsigned char m_buffer[65536];
 	int m_buf_start, m_buf_end;
-- 
2.30.2