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 (file)
--- a/csum-file.c
+++ b/csum-file.c
@@ -96,6 +96,26 @@ struct sha1file *sha1create(const char *fmt, ...)
        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;

diff --git a/csum-file.h b/csum-file.h
index 2b6c8dc..776cfb1 100644 (file)
--- a/csum-file.h
+++ b/csum-file.h
@@ -10,6 +10,7 @@ struct sha1file {
        unsigned char buffer[8192];
 };
 
+extern struct sha1file *sha1fd(int fd, const char *name);
 extern struct sha1file *sha1create(const char *fmt, ...);
 extern int sha1close(struct sha1file *, unsigned char *, int);
 extern int sha1write(struct sha1file *, void *, unsigned int);