From: Brian Downing <bdowning@lavos.net>
Date: Thu, 12 Jul 2007 12:55:48 +0000 (-0500)
Subject: Support fetching the memory usage of a delta index
X-Git-Tag: v1.5.3-rc1~10
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=11779e79078c9da604753e570d02134c8d4bae6a;p=git.git

Support fetching the memory usage of a delta index

Delta indices, at least on 64-bit platforms, tend to be larger than
the actual uncompressed data.  As such, keeping track of this storage
is important if you want to successfully limit the memory size of your
pack window.

Squirrel away the total allocation size inside the delta_index struct,
and add an accessor "sizeof_delta_index" to access it.

Signed-off-by: Brian Downing <bdowning@lavos.net>
Acked-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/delta.h b/delta.h
index 7b3f86d85..40ccf5a1e 100644
--- a/delta.h
+++ b/delta.h
@@ -23,6 +23,13 @@ create_delta_index(const void *buf, unsigned long bufsize);
  */
 extern void free_delta_index(struct delta_index *index);
 
+/*
+ * sizeof_delta_index: returns memory usage of delta index
+ *
+ * Given pointer must be what create_delta_index() returned, or NULL.
+ */
+extern unsigned long sizeof_delta_index(struct delta_index *index);
+
 /*
  * create_delta: create a delta from given index for the given buffer
  *
diff --git a/diff-delta.c b/diff-delta.c
index faf96e471..3af583536 100644
--- a/diff-delta.c
+++ b/diff-delta.c
@@ -119,6 +119,7 @@ struct index_entry {
 };
 
 struct delta_index {
+	unsigned long memsize;
 	const void *src_buf;
 	unsigned long src_size;
 	unsigned int hash_mask;
@@ -159,6 +160,7 @@ struct delta_index * create_delta_index(const void *buf, unsigned long bufsize)
 	mem = hash + hsize;
 	entry = mem;
 
+	index->memsize = memsize;
 	index->src_buf = buf;
 	index->src_size = bufsize;
 	index->hash_mask = hmask;
@@ -228,6 +230,14 @@ void free_delta_index(struct delta_index *index)
 	free(index);
 }
 
+unsigned long sizeof_delta_index(struct delta_index *index)
+{
+	if (index)
+		return index->memsize;
+	else
+		return 0;
+}
+
 /*
  * The maximum size for any opcode sequence, including the initial header
  * plus Rabin window plus biggest copy.