commit ada0ae4b8e972fbdb6a4f0b6854b81177f6c5cf4
Author: Oswald Buddenhagen <o...@users.sf.net>
Date: Sun Jul 30 18:37:58 2017 +0200
fix spurious decompression errors
while that's just bad api, inflate() can return Z_BUF_ERROR during
normal operation.
contrary to the zpipe example and what the documentation implies,
deflate() actually isn't that braindead. add respective comments.
REFMAIL: cala3aexmjtrl0tamguanpdtnn-_hj0sykoexwzoo6dvainf...@mail.gmail.com
src/socket.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/socket.c b/src/socket.c
index 4677c67..9357b8c 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -637,7 +637,9 @@ socket_fill_z( conn_t *sock )
sock->in_z->next_out = (unsigned char *)buf;
ret = inflate( sock->in_z, Z_SYNC_FLUSH );
- if (ret != Z_OK && ret != Z_STREAM_END) {
+ /* Z_BUF_ERROR happens here when the previous call both consumed
+ * all input and exactly filled up the output buffer. */
+ if (ret != Z_OK && ret != Z_BUF_ERROR && ret != Z_STREAM_END) {
error( "Error decompressing data from %s: %s\n", sock->name,
z_err_msg( ret, sock->in_z ) );
socket_fail( sock );
return;
@@ -824,6 +826,9 @@ do_flush( conn_t *conn )
conn->out_z->avail_in = 0;
conn->out_z->next_out = (uchar *)bc->data + bc->len;
conn->out_z->avail_out = buf_avail;
+ /* Z_BUF_ERROR cannot happen here, as zlib suppresses
the error
+ * both upon increasing the flush level (1st iteration)
and upon
+ * a no-op after the output buffer was full (later
iterations). */
if ((ret = deflate( conn->out_z, Z_PARTIAL_FLUSH )) !=
Z_OK) {
error( "Fatal: Compression error: %s\n",
z_err_msg( ret, conn->out_z ) );
abort();
@@ -892,6 +897,8 @@ socket_write( conn_t *conn, conn_iovec_t *iov, int iovcnt )
conn->out_z->avail_in = len;
conn->out_z->next_out = (uchar *)bc->data +
bc->len;
conn->out_z->avail_out = buf_avail;
+ /* Z_BUF_ERROR is impossible here, as the input
buffer always has data,
+ * and the output buffer always has space. */
if ((ret = deflate( conn->out_z, Z_NO_FLUSH ))
!= Z_OK) {
error( "Fatal: Compression error:
%s\n", z_err_msg( ret, conn->out_z ) );
abort();
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