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-rw-r--r--lib/libarchive/archive_read.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/libarchive/archive_read.c b/lib/libarchive/archive_read.c
index 8ef839a..1028c5d 100644
--- a/lib/libarchive/archive_read.c
+++ b/lib/libarchive/archive_read.c
@@ -741,3 +741,14 @@ __archive_read_register_compression(struct archive_read *a,
__archive_errx(1, "Not enough slots for compression registration");
return (NULL); /* Never actually executed. */
}
+
+/* used internally to simplify read-ahead */
+const void *
+__archive_read_ahead(struct archive_read *a, size_t len)
+{
+ const void *h;
+
+ if ((a->decompressor->read_ahead)(a, &h, len) < (ssize_t)len)
+ return (NULL);
+ return (h);
+}
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