1 files changed, 98 insertions, 0 deletions

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");
+}