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Support fetching the memory usage of a delta index

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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>
This commit is contained in:
Brian Downing 2007-07-12 07:55:48 -05:00 committed by Junio C Hamano
parent a1dab41af4
commit 11779e7907
2 changed files with 17 additions and 0 deletions
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7
delta.h
View file

@ -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
*

10
diff-delta.c
View file

@ -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.