csum-file: add "sha1fd()" to create a SHA1 csum file from an existing file descriptor
We'll use this soon to write pack-files to stdout.
diff --git a/csum-file.c b/csum-file.c
index 3ab65b7..c8c7369 100644
--- a/csum-file.c
+++ b/csum-file.c
@@ -96,6 +96,26 @@
return f;
}
+struct sha1file *sha1fd(int fd, const char *name)
+{
+ struct sha1file *f;
+ unsigned len;
+
+ f = xmalloc(sizeof(*f));
+
+ len = strlen(name);
+ if (len >= PATH_MAX)
+ die("you wascally wabbit, you");
+ f->namelen = len;
+ memcpy(f->name, name, len+1);
+
+ f->fd = fd;
+ f->error = 0;
+ f->offset = 0;
+ SHA1_Init(&f->ctx);
+ return f;
+}
+
int sha1write_compressed(struct sha1file *f, void *in, unsigned int size)
{
z_stream stream;
