lib-compression: Add COMPRESSION_HDR_MAX_SIZE macro

Will be used by the next commit.

diff --git a/src/lib-compression/compression.h b/src/lib-compression/compression.h
index 5a3404fe63ef23a09d6d340ad514728fe684aaa8..b27d09e8bc864a559c2bc7fd5d43b6f813c25b7b 100644 (file)
--- a/src/lib-compression/compression.h
+++ b/src/lib-compression/compression.h
@@ -1,6 +1,11 @@
 #ifndef COMPRESSION_H
 #define COMPRESSION_H
 
+/* Compressed input is always detected once at maximum this many bytes have
+   been read. This value must be smaller than a typical istream max buffer
+   size. */
+#define COMPRESSION_HDR_MAX_SIZE 128
+
 struct compression_handler {
        const char *name;
        const char *ext;