diff options
| -rw-r--r-- | csum-file.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/csum-file.c b/csum-file.c index 28389541a3..bb70c75ee1 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; |