Merge branch 'nd/stream-more'

[git.git] / streaming.c

diff --git a/streaming.c b/streaming.c
index 71072e1b1da670cdb4b048a3a6e83a4ae806bf5f..7e7ee2be6fe147ff660f8ab25618fbe4d4d0f11c 100644 (file)
--- a/streaming.c
+++ b/streaming.c
@@ -489,3 +489,58 @@ static open_method_decl(incore)
 
        return st->u.incore.buf ? 0 : -1;
 }
+
+
+/****************************************************************
+ * Users of streaming interface
+ ****************************************************************/
+
+int stream_blob_to_fd(int fd, unsigned const char *sha1, struct stream_filter *filter,
+                     int can_seek)
+{
+       struct git_istream *st;
+       enum object_type type;
+       unsigned long sz;
+       ssize_t kept = 0;
+       int result = -1;
+
+       st = open_istream(sha1, &type, &sz, filter);
+       if (!st)
+               return result;
+       if (type != OBJ_BLOB)
+               goto close_and_exit;
+       for (;;) {
+               char buf[1024 * 16];
+               ssize_t wrote, holeto;
+               ssize_t readlen = read_istream(st, buf, sizeof(buf));
+
+               if (!readlen)
+                       break;
+               if (can_seek && sizeof(buf) == readlen) {
+                       for (holeto = 0; holeto < readlen; holeto++)
+                               if (buf[holeto])
+                                       break;
+                       if (readlen == holeto) {
+                               kept += holeto;
+                               continue;
+                       }
+               }
+
+               if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1)
+                       goto close_and_exit;
+               else
+                       kept = 0;
+               wrote = write_in_full(fd, buf, readlen);
+
+               if (wrote != readlen)
+                       goto close_and_exit;
+       }
+       if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 ||
+                    write(fd, "", 1) != 1))
+               goto close_and_exit;
+       result = 0;
+
+ close_and_exit:
+       close_istream(st);
+       return result;
+}