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Diffstat (limited to 'csum-file.c')
-rw-r--r--csum-file.c27
1 files changed, 17 insertions, 10 deletions
diff --git a/csum-file.c b/csum-file.c
index 28389541a..bb70c75ee 100644
--- a/csum-file.c
+++ b/csum-file.c
@@ -11,10 +11,8 @@
#include "progress.h"
#include "csum-file.h"
-static void sha1flush(struct sha1file *f, unsigned int count)
+static void sha1flush(struct sha1file *f, void *buf, unsigned int count)
{
- void *buf = f->buffer;
-
for (;;) {
int ret = xwrite(f->fd, buf, count);
if (ret > 0) {
@@ -39,7 +37,7 @@ int sha1close(struct sha1file *f, unsigned char *result, unsigned int flags)
if (offset) {
SHA1_Update(&f->ctx, f->buffer, offset);
- sha1flush(f, offset);
+ sha1flush(f, f->buffer, offset);
f->offset = 0;
}
SHA1_Final(f->buffer, &f->ctx);
@@ -47,7 +45,7 @@ int sha1close(struct sha1file *f, unsigned char *result, unsigned int flags)
hashcpy(result, f->buffer);
if (flags & (CSUM_CLOSE | CSUM_FSYNC)) {
/* write checksum and close fd */
- sha1flush(f, 20);
+ sha1flush(f, f->buffer, 20);
if (flags & CSUM_FSYNC)
fsync_or_die(f->fd, f->name);
if (close(f->fd))
@@ -62,21 +60,30 @@ int sha1close(struct sha1file *f, unsigned char *result, unsigned int flags)
int sha1write(struct sha1file *f, void *buf, unsigned int count)
{
- if (f->do_crc)
- f->crc32 = crc32(f->crc32, buf, count);
while (count) {
unsigned offset = f->offset;
unsigned left = sizeof(f->buffer) - offset;
unsigned nr = count > left ? left : count;
+ void *data;
+
+ if (f->do_crc)
+ f->crc32 = crc32(f->crc32, buf, nr);
+
+ if (nr == sizeof(f->buffer)) {
+ /* process full buffer directly without copy */
+ data = buf;
+ } else {
+ memcpy(f->buffer + offset, buf, nr);
+ data = f->buffer;
+ }
- memcpy(f->buffer + offset, buf, nr);
count -= nr;
offset += nr;
buf = (char *) buf + nr;
left -= nr;
if (!left) {
- SHA1_Update(&f->ctx, f->buffer, offset);
- sha1flush(f, offset);
+ SHA1_Update(&f->ctx, data, offset);
+ sha1flush(f, data, offset);
offset = 0;
}
f->offset = offset;