From 072326fef01a2e9ca321c7af73db14675b696439 Mon Sep 17 00:00:00 2001
From: Thomas Waldmann <tw@waldmann-edv.de>
Date: Sun, 31 May 2015 18:41:23 +0200
Subject: [PATCH] chunker: get rid of read_buf

if we have a OS file handle, we can directly read to the final destination - one memcpy less.
if we have a Python file object, we get a Python bytes object as read result (can't save the memcpy here).
---
 borg/_chunker.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/borg/_chunker.c b/borg/_chunker.c
index 526878596..20461e7c6 100644
--- a/borg/_chunker.c
+++ b/borg/_chunker.c
@@ -79,7 +79,7 @@ typedef struct {
     int window_size, chunk_mask, min_size;
     size_t buf_size;
     uint32_t *table;
-    uint8_t *data, *read_buf;
+    uint8_t *data;
     PyObject *fd;
     int fh;
     int done, eof;
@@ -96,7 +96,6 @@ chunker_init(int window_size, int chunk_mask, int min_size, int max_size, uint32
     c->table = buzhash_init_table(seed);
     c->buf_size = max_size;
     c->data = malloc(c->buf_size);
-    c->read_buf = malloc(c->buf_size);
     return c;
 }
 
@@ -122,7 +121,6 @@ chunker_free(Chunker *c)
     Py_XDECREF(c->fd);
     free(c->table);
     free(c->data);
-    free(c->read_buf);
     free(c);
 }
 
@@ -140,9 +138,8 @@ chunker_fill(Chunker *c)
     }
     if(c->fh >= 0) {
         // if we have a os-level file descriptor, use os-level API
-        n = read(c->fh, c->read_buf, n);
+        n = read(c->fh, c->data + c->position + c->remaining, n);
         if(n > 0) {
-            memcpy(c->data + c->position + c->remaining, c->read_buf, n);
             c->remaining += n;
             c->bytes_read += n;
         }