From 6fcd86dce909f05de818fdd78d76e70aabc3ad22 Mon Sep 17 00:00:00 2001
From: Ricardo Markiewicz <rmarkie@fi.uba.ar>
Date: Mon, 12 Sep 2005 04:19:26 +0000
Subject: [PATCH] Paso todo a C++

---
 src/Makefile  |  3 ++-
 src/btree.c   | 58 --------------------------------------------------
 src/btree.cpp | 47 ++++++++++++++++++++++++++++++++++++++++
 src/btree.h   | 59 +++++++++++++++++++--------------------------------
 src/main.c    |  4 ++--
 5 files changed, 73 insertions(+), 98 deletions(-)
 delete mode 100644 src/btree.c
 create mode 100644 src/btree.cpp

diff --git a/src/Makefile b/src/Makefile
index b97eadb..5440d99 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,6 +1,7 @@
 TARGET=btree
-CFLAGS="-Wall"
+CXXFLAGS=-Wall -g
 
 all: $(TARGET)
 
 $(TARGET): main.o btree.o
+	g++ -o $(TARGET) main.o btree.o
diff --git a/src/btree.c b/src/btree.c
deleted file mode 100644
index 1cdf037..0000000
--- a/src/btree.c
+++ /dev/null
@@ -1,58 +0,0 @@
-
-#include "btree.h"
-
-static void write_tree_header (BTree *tree);
-static void write_block (BTree *tree, uchar *block, uint num);
-
-BTree *btree_create (const char *filename, unsigned int block_size)
-{
-	BTree *tree;
-	uchar *node;
-
-	tree = malloc (sizeof(BTree));
-	if (!tree)
-		return NULL;
-
-	tree->fp = fopen (filename, "wb");
-	if (!tree->fp) {
-		free (tree);
-		return NULL;
-	}
-
-	/* Nombre de archivo */
-	tree->filename = malloc(sizeof(char)*strlen(filename)+1);
-	strcpy (tree->filename, filename);
-	
-	/* Inicializo el header */
-	tree->header.block_size = block_size;
-	write_tree_header (tree);
-
-	/* Creo el primer bloque vacio */
-	node = calloc (1, block_size);
-	write_block (tree, node, 0);
-	free (node);
-
-	return tree;
-}
-
-int btree_close (BTree *tree)
-{
-	fclose (tree->fp);
-	free (tree->filename);
-	free (tree);
-
-	return 0;
-}
-
-static void write_tree_header (BTree *tree)
-{
-	fseek (tree->fp, 0L, SEEK_SET);
-	fwrite (&tree->header, 1, sizeof (BTreeHeader), tree->fp);
-}
-
-static void write_block (BTree *tree, uchar *block, uint num)
-{
-	fseek (tree->fp, num*tree->header.block_size + sizeof (BTreeHeader), SEEK_SET);
-	fwrite (block, 1, tree->header.block_size, tree->fp);
-}
-
diff --git a/src/btree.cpp b/src/btree.cpp
new file mode 100644
index 0000000..1ad006d
--- /dev/null
+++ b/src/btree.cpp
@@ -0,0 +1,47 @@
+
+#include "btree.h"
+
+BTree::BTree (const char *name, unsigned int block_size, bool create_new_file)
+{
+	uchar *node;
+
+
+	fp = fopen (name, "wb");
+	if (!fp) {
+		/* TODO : mandar una exception ? */
+		return;
+	}
+
+	/* Nombre de archivo */
+	filename = name;
+	
+	/* Inicializo el header */
+	header.block_size = block_size;
+	write_tree_header ();
+
+	/* Creo el primer bloque vacio */
+	node = new uchar[block_size];
+	write_block (node, 0);
+	delete [] node;
+}
+
+BTree::~BTree ()
+{
+	fclose (fp);
+}
+
+void BTree::write_tree_header ()
+{
+	fseek (fp, 0L, SEEK_SET);
+	fwrite (&header, 1, sizeof (BTreeHeader), fp);
+}
+
+void BTree::write_block (uchar *block, uint num)
+{
+	fseek (fp, num*header.block_size + sizeof (BTreeHeader), SEEK_SET);
+	fwrite (block, 1, header.block_size, fp);
+}
+
+void BTree::AddKey () {}
+void BTree::DelKey () {}
+
diff --git a/src/btree.h b/src/btree.h
index 6764a63..cacd29b 100644
--- a/src/btree.h
+++ b/src/btree.h
@@ -44,9 +44,7 @@
  *    tomar una idea simimar)
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <string>
 
 /* alias para codear menos :) */
 typedef unsigned char uchar;
@@ -75,46 +73,33 @@ typedef struct _btree_header_ {
 	unsigned int item_count;
 } BTreeHeader;
 
-typedef struct _btree_ {
-	char *filename;
-	BTreeFileHeader header;
-
-	/** Apunta al archivo de datos, asi se abre solo 1 vez
-	 *
-	 *  \TODO Ver si vale la pena
-	 */
-	FILE *fp;
-} BTree;
-
 /** Crea un nuevo arbol B
  *
  *  \param filename Nombre del archivo a crear
  *  \param block_size Tamaño de bloque a utilizar
  *  \return Un nuevo arbol B creado o NULL en caso de error
  */
-BTree *btree_create (const char *filename, unsigned int block_size);
-
-/** Abre un arbol B existente
- *
- *  \param filename Nombre del archivo a abrir
- *  \return El arbol abierto o NULL en caso de error
- */
-BTree *btree_open (const char *filename);
-
-/** Agrega una clave en el arbol
- *
- *  \TODO Definir parametros
- */
-int btree_add (BTree *);
-
-/** Borra una clave del arbol
- *
- *  \TODO Definir parametros
- */
-int btree_del (BTree *);
-
-/** Cierra el arbol y libera los recursos */
-int btree_close (BTree *);
+class BTree {
+	public:
+		BTree (const char *filename, unsigned int block_size, bool create_new_file = false);
+		~BTree ();
+
+		void AddKey ();
+		void DelKey ();
+
+	private:
+		void write_tree_header ();
+		void write_block (uchar *block, uint num);
+
+		std::string filename;
+		BTreeFileHeader header;
+
+		/** Apunta al archivo de datos, asi se abre solo 1 vez
+		 *
+		 *  \TODO Ver si vale la pena
+		 */
+		FILE *fp;
+};
 
 #endif // _B_TREE_H
 
diff --git a/src/main.c b/src/main.c
index f058d58..0ad6845 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,9 +6,9 @@ int main  (int argc, char *argv[])
 {
 	BTree *tree;
 
-	tree = btree_create ("test.idx", 1024);
+	tree = new BTree ("test.idx", 1024);
 
-	btree_close (tree);
+	delete tree;
 
 	return 0;
 }
-- 
2.43.0