From 876e1a4724a7bd75dc642e295de354241096e028 Mon Sep 17 00:00:00 2001
From: llornkcor <llornkcor>
Date: Fri, 20 Dec 2002 01:35:01 +0000
Subject: update - sorry it took so long. hope this works correctly

---
(limited to 'noncore/apps/opie-reader/Navigation.cpp')

diff --git a/noncore/apps/opie-reader/Navigation.cpp b/noncore/apps/opie-reader/Navigation.cpp
new file mode 100644
index 0000000..7b392ba
--- a/dev/null
+++ b/noncore/apps/opie-reader/Navigation.cpp
@@ -0,0 +1,98 @@
+#include "Navigation.h"
+
+void CNavigation::saveposn(size_t posn)
+{
+//    qDebug("Saved:%u [%u,%u,%u]", posn, historystart, historycurrent, historyend);
+    historycurrent = historyend = (historycurrent+1)%NAVIGATION_HISTORY_SIZE;
+    history[historycurrent] = posn;
+    if (historystart == historyend) historystart = (historystart+1)%NAVIGATION_HISTORY_SIZE;
+//    qDebug("Saved:%u [%u,%u,%u]", posn, historystart, historycurrent, historyend);
+}
+
+bool CNavigation::forward(size_t& loc)
+{
+    if (historycurrent != historyend)
+    {
+	historycurrent = (historycurrent + 1)%NAVIGATION_HISTORY_SIZE;
+	loc = history[historycurrent];
+//	qDebug("Forward:%u [%u,%u,%u]", loc, historystart, historycurrent, historyend);
+	return true;
+    }
+    else
+    {
+	return false;
+    }
+}
+
+bool CNavigation::back(size_t& loc)
+{
+    if (historyend != historystart)
+    {
+//	qDebug("Back:%u [%u,%u,%u]", loc, historystart, historycurrent, historyend);
+	if (historycurrent == historyend && history[historycurrent] != loc)
+	{
+	    historyend = (historyend+1) % NAVIGATION_HISTORY_SIZE;
+	    history[historyend] = loc;
+	}
+	else
+	{
+	    size_t sv = historycurrent;
+	    historycurrent = (historycurrent + NAVIGATION_HISTORY_SIZE - 1) % NAVIGATION_HISTORY_SIZE;
+	    if (historycurrent == historystart)
+	    {
+		historycurrent = sv;
+		return false;
+	    }
+	}
+	loc = history[historycurrent];
+//	qDebug("Back:%u [%u,%u,%u]", loc, historystart, historycurrent, historyend);
+	return true;
+    }
+    else
+    {
+	return false;
+    }
+}
+
+#include <stdio.h>
+
+void CNavigation::setSaveData(unsigned char*& data, unsigned short& len, unsigned char* src, unsigned short srclen)
+{
+    len = srclen+sizeof(size_t)*(3+NAVIGATION_HISTORY_SIZE);
+    data = new unsigned char[len];
+    unsigned char* p = data;
+    memcpy(p, src, srclen);
+    p += srclen;
+    memcpy(p, &historystart, sizeof(size_t));
+    p += sizeof(size_t);
+    memcpy(p, &historyend, sizeof(size_t));
+    p += sizeof(size_t);
+    memcpy(p, &historycurrent, sizeof(size_t));
+    p += sizeof(size_t);
+    memcpy(p, history, sizeof(size_t)*NAVIGATION_HISTORY_SIZE);
+    printf("<%u,%u,%u>\n", historystart, historyend, historycurrent);
+    for (int i = historystart; i <= historyend; i++)
+	printf("<%u> ", history[i]);
+    printf("\n");
+}
+
+void CNavigation::putSaveData(unsigned char*& src, unsigned short& srclen)
+{
+    if (srclen >= sizeof(size_t)*(3+NAVIGATION_HISTORY_SIZE))
+    {
+	unsigned char* p = src;
+	memcpy(&historystart, p, sizeof(size_t));
+	p += sizeof(size_t);
+	memcpy(&historyend, p, sizeof(size_t));
+	p += sizeof(size_t);
+	memcpy(&historycurrent, p, sizeof(size_t));
+	p += sizeof(size_t);
+	memcpy(history, p, sizeof(size_t)*NAVIGATION_HISTORY_SIZE);
+	src = p + sizeof(size_t)*NAVIGATION_HISTORY_SIZE;
+	srclen -= sizeof(size_t)*(3+NAVIGATION_HISTORY_SIZE);
+    }
+    printf("<%u,%u,%u>\n", historystart, historyend, historycurrent);
+    for (int i = historystart; i <= historyend; i++)
+	printf("<%u> ", history[i]);
+    printf("\n");
+}
--
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