From 26a99cd8957db86bdc75d9d1ebf00146cb20c87c Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Sun, 2 Oct 2011 13:24:43 -0700
Subject: Add a transparent write mode to gzopen() when 'T' is in the mode.

---
 gzlib.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'gzlib.c')

diff --git a/gzlib.c b/gzlib.c
index 7b31d24..e53b6ab 100644
--- a/gzlib.c
+++ b/gzlib.c
@@ -79,7 +79,6 @@ local void gz_reset(state)
     if (state->mode == GZ_READ) {   /* for reading ... */
         state->eof = 0;             /* not at end of file */
         state->how = LOOK;          /* look for gzip header */
-        state->direct = 1;          /* default for empty file */
     }
     state->seek = 0;                /* no seek request pending */
     gz_error(state, Z_OK, NULL);    /* clear error */
@@ -111,6 +110,7 @@ local gzFile gz_open(path, fd, mode)
     state->mode = GZ_NONE;
     state->level = Z_DEFAULT_COMPRESSION;
     state->strategy = Z_DEFAULT_STRATEGY;
+    state->direct = 0;
     while (*mode) {
         if (*mode >= '0' && *mode <= '9')
             state->level = *mode - '0';
@@ -143,6 +143,8 @@ local gzFile gz_open(path, fd, mode)
                 break;
             case 'F':
                 state->strategy = Z_FIXED;
+            case 'T':
+                state->direct = 1;
             default:        /* could consider as an error, but just ignore */
                 ;
             }
@@ -155,6 +157,15 @@ local gzFile gz_open(path, fd, mode)
         return NULL;
     }
 
+    /* can't force transparent read */
+    if (state->mode == GZ_READ) {
+        if (state->direct) {
+            free(state);
+            return NULL;
+        }
+        state->direct = 1;      /* for empty file */
+    }
+
     /* save the path name for error messages */
     state->path = malloc(strlen(path) + 1);
     if (state->path == NULL) {
-- 
cgit v1.2.3-55-g6feb