From ec7d16e77f66472470f0bea8d56dc5129de756c9 Mon Sep 17 00:00:00 2001
From: fc_botelho <fc_botelho>
Date: Wed, 19 Apr 2006 18:02:40 +0000
Subject: [PATCH] buffer_manage.c and buffer_manage.h added

---
 src/buffer_manage.c | 66 +++++++++++++++++++++++++++++++++++++++++++++
 src/buffer_manage.h | 12 +++++++++
 2 files changed, 78 insertions(+)
 create mode 100644 src/buffer_manage.c
 create mode 100644 src/buffer_manage.h

diff --git a/src/buffer_manage.c b/src/buffer_manage.c
new file mode 100644
index 0000000..5b518d5
--- /dev/null
+++ b/src/buffer_manage.c
@@ -0,0 +1,66 @@
+#include "buffer_manage.h"
+#include "buffer_entry.h"
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+struct __buffer_manage_t
+{
+	cmph_uint32 memory_avail;         // memory available
+	buffer_entry_t ** buffer_entries; // buffer entries to be managed
+	cmph_uint32 nentries;             // number of entries to be managed
+	cmph_uint32 *memory_avail_list;   // memory available list
+	int pos_avail_list;               // current position in memory available list
+};
+
+buffer_manage_t * buffer_manage_new(cmph_uint32 memory_avail, cmph_uint32 nentries)
+{
+	cmph_uint32 memory_avail_entry, i;
+	buffer_manage_t *buff_manage = (buffer_manage_t *)malloc(sizeof(buffer_manage_t));
+	assert(buff_manage);
+	buff_manage->memory_avail = memory_avail;
+	buff_manage->buffer_entries = (buffer_entry_t **)calloc(nentries, sizeof(buffer_entry_t *));
+	buff_manage->memory_avail_list = (cmph_uint32 *)calloc(nentries, sizeof(cmph_uint32));
+	buff_manage->pos_avail_list = -1;
+	buff_manage->nentries = nentries;
+	memory_avail_entry = buff_manage->memory_avail/buff_manage->nentries + 1;
+	for(i = 0; i < buff_manage->nentries; i++)
+	{
+		buff_manage->buffer_entries[i] = buffer_entry_new(memory_avail_entry);
+	}	
+	return buff_manage;
+}
+
+void buffer_manage_open(buffer_manage_t * buffer_manage, cmph_uint32 index, char * filename)
+{
+	buffer_entry_open(buffer_manage->buffer_entries[index], filename);
+}
+
+cmph_uint8 * buffer_manage_read_key(buffer_manage_t * buffer_manage, cmph_uint32 index)
+{
+	cmph_uint8 * key = NULL;
+	if (buffer_manage->pos_avail_list >= 0 ) // recovering memory
+	{
+		cmph_uint32 new_capacity = buffer_entry_get_capacity(buffer_manage->buffer_entries[index]) + buffer_manage->memory_avail_list[(buffer_manage->pos_avail_list)--];
+		buffer_entry_set_capacity(buffer_manage->buffer_entries[index], new_capacity);
+		//fprintf(stderr, "recovering memory\n");
+	}
+	key = buffer_entry_read_key(buffer_manage->buffer_entries[index]);
+	if (key == NULL) // storing memory to be recovered
+	{
+		buffer_manage->memory_avail_list[++(buffer_manage->pos_avail_list)] = buffer_entry_get_capacity(buffer_manage->buffer_entries[index]);
+		//fprintf(stderr, "storing memory to be recovered\n");
+	}
+	return key;
+}
+
+void buffer_manage_destroy(buffer_manage_t * buffer_manage)
+{ 
+	cmph_uint32 i;
+	for(i = 0; i < buffer_manage->nentries; i++)
+	{
+		buffer_entry_destroy(buffer_manage->buffer_entries[i]);
+	}
+	free(buffer_manage->memory_avail_list);
+	free(buffer_manage->buffer_entries);
+	free(buffer_manage);
+}
diff --git a/src/buffer_manage.h b/src/buffer_manage.h
new file mode 100644
index 0000000..8c66cff
--- /dev/null
+++ b/src/buffer_manage.h
@@ -0,0 +1,12 @@
+#ifndef __CMPH_BUFFER_MANAGE_H__
+#define __CMPH_BUFFER_MANAGE_H__
+
+#include "cmph_types.h"
+#include <stdio.h>
+typedef struct __buffer_manage_t buffer_manage_t;
+
+buffer_manage_t * buffer_manage_new(cmph_uint32 memory_avail, cmph_uint32 nentries);
+void buffer_manage_open(buffer_manage_t * buffer_manage, cmph_uint32 index, char * filename);
+cmph_uint8 * buffer_manage_read_key(buffer_manage_t * buffer_manage, cmph_uint32 index);
+void buffer_manage_destroy(buffer_manage_t * buffer_manage);
+#endif