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fix spurious decompression errors

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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-_HJ0sYkOEXWzoO6DVaiNFUHQ@mail.gmail.com
This commit is contained in:
Oswald Buddenhagen 2017-07-30 18:37:58 +02:00
parent 366ed7d762
commit ada0ae4b8e
1 changed files with 8 additions and 1 deletions
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9
src/socket.c
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@ -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();