* first implementation of passing data via area to app_server

this makes printing of large images work, fixes task #1067



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27214 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/app/LinkReceiver.cpp

@@ -21,7 +21,7 @@
 #include <Region.h>
 
 #include "link_message.h"
-
+#include "syscalls.h"
 
 //#define DEBUG_BPORTLINK
 #ifdef DEBUG_BPORTLINK
@@ -245,9 +245,11 @@ LinkReceiver::ReadFromPort(bigtime_t timeout)
 
 
 status_t
-LinkReceiver::Read(void *data, ssize_t size)
+LinkReceiver::Read(void *data, ssize_t passedSize)
 {
 //	STRACE(("info: LinkReceiver Read()ing %ld bytes...\n", size));
+	ssize_t size = passedSize;
+
 	if (fReadError < B_OK)
 		return fReadError;
 
@@ -259,13 +261,49 @@ LinkReceiver::Read(void *data, ssize_t size)
 	if (fDataSize == 0 || fReplySize == 0)
 		return B_NO_INIT;	// need to call GetNextReply() first
 
+	bool useArea = false;
+	if ((size_t)size >= kMaxBufferSize) {
+		useArea = true;
+		size = sizeof(area_id);
+	}
+
 	if (fRecvPosition + size > fRecvStart + fReplySize) {
 		// reading past the end of current message
 		fReadError = B_BAD_VALUE;
 		return B_BAD_VALUE;
 	}
 
-	memcpy(data, fRecvBuffer + fRecvPosition, size);
+	if (useArea) {
+		area_id sourceArea;
+		memcpy((void*)&sourceArea, fRecvBuffer + fRecvPosition, size);
+
+		area_info areaInfo;
+		if (get_area_info(sourceArea, &areaInfo) < B_OK)
+			fReadError = B_BAD_VALUE;
+
+		if (fReadError >= B_OK) {
+			thread_info threadInfo;
+			get_thread_info(find_thread(NULL), &threadInfo);
+
+			void* areaAddress = NULL;
+			if (areaInfo.team != threadInfo.team) {
+				sourceArea = _kern_transfer_area(sourceArea, &areaAddress,
+					B_ANY_ADDRESS, threadInfo.team);
+		
+				if (sourceArea < B_OK)
+					fReadError = sourceArea;
+			} else {
+				areaAddress = areaInfo.address;
+			}
+			
+			if (areaAddress && sourceArea >= B_OK) {
+				memcpy(data, areaAddress, passedSize);
+				delete_area(sourceArea);
+			}
+		}
+	} else {
+		memcpy(data, fRecvBuffer + fRecvPosition, size);
+	}
 	fRecvPosition += size;
 	return fReadError;
 }

src/kits/app/LinkSender.cpp

@@ -129,8 +129,11 @@ LinkSender::CancelMessage()
 
 
 status_t
-LinkSender::Attach(const void *data, size_t size)
+LinkSender::Attach(const void *passedData, size_t passedSize)
 {
+	size_t size = passedSize;
+	const void* data = passedData;
+
 	if (fCurrentStatus < B_OK)
 		return fCurrentStatus;
 
@@ -140,6 +143,12 @@ LinkSender::Attach(const void *data, size_t size)
 	if (fCurrentEnd == fCurrentStart)
 		return B_NO_INIT;	// need to call StartMessage() first
 
+	bool useArea = false;
+	if (size >= kMaxBufferSize) {
+		useArea = true;
+		size = sizeof(area_id);
+	}
+
 	if (SpaceLeft() < size) {
 		// we have to make space for the data
 
@@ -148,6 +157,20 @@ LinkSender::Attach(const void *data, size_t size)
 			return fCurrentStatus = status;
 	}
 
+	area_id senderArea = -1;
+	if (useArea) {
+		void* address = NULL;
+		off_t alignedSize = (passedSize + B_PAGE_SIZE) & ~(B_PAGE_SIZE - 1);
+		senderArea = create_area("LinkSenderArea", &address, B_ANY_ADDRESS,
+			alignedSize, B_NO_LOCK, B_READ_AREA | B_WRITE_AREA);
+
+		if (senderArea < B_OK)
+			return senderArea;
+
+		data = &senderArea;
+		memcpy(address, passedData, passedSize);
+	}
+
 	memcpy(fBuffer + fCurrentEnd, data, size);
 	fCurrentEnd += size;
 

src/servers/app/ServerPicture.cpp

@@ -30,6 +30,7 @@
 #include <List.h>
 #include <Shape.h>
 
+#include <new>
 #include <stdio.h>
 #include <stack>
 
@@ -976,37 +977,27 @@ ServerPicture::DataLength() const
 }
 
 
-#define BUFFER_SIZE 4096
-
-
 status_t
 ServerPicture::ImportData(BPrivate::LinkReceiver &link)
 {	
 	int32 size = 0;
 	link.Read<int32>(&size);
 
-	if (size >= 65536) {
-		//TODO: Pass via an area.
-		// Ideally the Link** api would allow to write partial messages,
-		// so that a big picture could be written in chunks of 4096 bytes
-		// or so
-		return B_ERROR;
-	}
-
 	off_t oldPosition = fData->Position();
 	fData->Seek(0, SEEK_SET);
 
-	// TODO: Oh yeah... 65kb on the stack...
-	char buffer[size];
-	status_t read = link.Read(buffer, size);
-	if (read < B_OK)
-		return (status_t)read;		
-	
-	fData->Write(buffer, size);	
+	status_t status = B_NO_MEMORY;
+	char* buffer = new(std::nothrow) char[size];
+	if (buffer) {
+		status = B_OK;
+		ssize_t read = link.Read(buffer, size);
+		if (read < B_OK || fData->Write(buffer, size) < B_OK)
+			status = B_ERROR;
+		delete [] buffer;
+	}
 
 	fData->Seek(oldPosition, SEEK_SET);
-	
-	return B_OK;
+	return status;
 }
 
 
@@ -1032,27 +1023,24 @@ ServerPicture::ExportData(BPrivate::PortLink &link)
 	off_t size = 0;
 	fData->GetSize(&size);
 	link.Attach<int32>((int32)size);
-	if (size >= 65536) {
-		//TODO: Pass via an area
+
+	status_t status = B_NO_MEMORY;
+	char* buffer = new(std::nothrow) char[size];
+	if (buffer) {
+		status = B_OK;
+		ssize_t read = fData->Read(buffer, size);
+		if (read < B_OK || link.Attach(buffer, read) < B_OK)
+			status = B_ERROR;
+		delete [] buffer;
+	}
+
+	if (status < B_OK) {
 		link.CancelMessage();
 		link.StartMessage(B_ERROR);
-		return B_ERROR;
 	}
-	// TODO: Oh yeah... 65kb on the stack...
-	char buffer[size];
-	ssize_t read = fData->Read(buffer, size);
-	if (read < B_OK)
-		return (status_t)read;		
-	if (link.Attach(buffer, read) < B_OK) {
-		//
-		link.CancelMessage();
-		link.StartMessage(B_ERROR);	
-	};
 
-	
 	fData->Seek(oldPosition, SEEK_SET);
-
-	return B_OK;
+	return status;
 }