From e0b05403f4183d4ff3916412fd7341439bdbd6b4 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Sun, 12 Oct 2014 00:44:45 -0700
Subject: [PATCH] Util: Pull basic table struct from another branch

---
 src/util/table.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/util/table.h | 19 +++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 src/util/table.c
 create mode 100644 src/util/table.h

diff --git a/src/util/table.c b/src/util/table.c
new file mode 100644
index 000000000..1ce8dfe11
--- /dev/null
+++ b/src/util/table.c
@@ -0,0 +1,60 @@
+#include "table.h"
+
+#define LIST_INITIAL_SIZE 8
+
+struct TableTuple {
+	uint32_t key;
+	void* value;
+};
+
+struct TableList {
+	struct TableTuple* list;
+	size_t nEntries;
+	size_t listSize;
+};
+
+void TableInit(struct Table* table, size_t initialSize) {
+	table->tableSize = initialSize;
+	table->table = calloc(table->tableSize, sizeof(struct TableList));
+
+	size_t i;
+	for (i = 0; i < table->tableSize; ++i) {
+		table->table[i].listSize = LIST_INITIAL_SIZE;
+		table->table[i].list = calloc(LIST_INITIAL_SIZE, sizeof(struct TableTuple));
+	}
+}
+
+void TableDeinit(struct Table* table) {
+	size_t i;
+	for (i = 0; i < table->tableSize; ++i) {
+		// TODO: Don't leak entries
+		free(table->table[i].list);
+	}
+	free(table->table);
+	table->table = 0;
+	table->tableSize = 0;
+}
+
+void* TableLookup(struct Table* table, uint32_t key) {
+	uint32_t entry = key & (table->tableSize - 1);
+	struct TableList* list = &table->table[entry];
+	size_t i;
+	for (i = 0; i < list->nEntries; ++i) {
+		if (list->list[i].key == key) {
+			return list->list[i].value;
+		}
+	}
+	return 0;
+}
+
+void TableInsert(struct Table* table, uint32_t key, void* value) {
+	uint32_t entry = key & (table->tableSize - 1);
+	struct TableList* list = &table->table[entry];
+	if (list->nEntries + 1 == list->listSize) {
+		list->listSize *= 2;
+		list->list = realloc(list->list, list->listSize * sizeof(struct TableTuple));
+	}
+	list->list[list->nEntries].key = key;
+	list->list[list->nEntries].value = value;
+	++list->nEntries;
+}
diff --git a/src/util/table.h b/src/util/table.h
new file mode 100644
index 000000000..d769efdea
--- /dev/null
+++ b/src/util/table.h
@@ -0,0 +1,19 @@
+#ifndef TABLE_H
+#define TABLE_H
+
+#include "util/common.h"
+
+struct TableList;
+
+struct Table {
+	struct TableList* table;
+	size_t tableSize;
+};
+
+void TableInit(struct Table*, size_t initialSize);
+void TableDeinit(struct Table*);
+
+void* TableLookup(struct Table*, uint32_t key);
+void TableInsert(struct Table*, uint32_t key, void* value);
+
+#endif