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[z.facultad/75.52/treemulator.git] / src / btree.cpp

diff --git a/src/btree.cpp b/src/btree.cpp
index 6771746f1971b7b7aa8aa61ece6f580c01c52b01..e78a91e406688633f1818fad4464e9776f9b8c03 100644 (file)
--- a/src/btree.cpp
+++ b/src/btree.cpp
@@ -33,9 +33,52 @@ BTree::BTree (const std::string &name, unsigned int block_size, int tt, int kt,
        delete [] node;
 }
 
+BTree::BTree (const std::string &name)
+{
+       /* Leo los bloques recuperables */
+       std::string del = filename + ".del";
+
+       fp = fopen (del.c_str (), "wb");
+       if (fp != NULL) {
+               uint i;
+
+               while (fread (&i, 1, sizeof (uint), fp)) {
+                       deleted_nodes.push_back (i);
+               }
+
+               fclose (fp);
+       }
+
+       fp = fopen (name.c_str(), "rb+");
+       if (!fp) {
+               /* TODO : mandar una exception ? */
+               return;
+       }
+       ReadFileHeader ();
+}
+
 BTree::~BTree ()
 {
        fclose (fp);
+
+       std::string del = filename + ".del";
+
+       fp = fopen (del.c_str (), "wb");
+       std::list<uint>::iterator it = deleted_nodes.begin ();
+
+       while (it != deleted_nodes.end ()) {
+               uint i = *it;
+               fwrite (&i, 1, sizeof (uint), fp);
+               it++;
+       }
+
+       fclose (fp);
+}
+
+void BTree::ReadFileHeader ()
+{
+       fseek (fp, 0L, SEEK_SET);
+       fread (&header, 1, sizeof (BTreeFileHeader), fp);
 }
 
 void BTree::WriteFileHeader ()
@@ -1138,9 +1181,9 @@ uchar *BTree::NewBlock (uint &num)
        BTreeNodeHeader nh;
 
        std::list<uint>::iterator it;
-       it = deleted_nodes.begin ();
 
-       if (it != deleted_nodes.end ()) {
+       if (deleted_nodes.size ()) {
+               it = deleted_nodes.begin ();
                num = *it;
                deleted_nodes.erase (it);
        } else {