From e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 28 Aug 2015 09:58:54 +0800 Subject: Add qemu 2.4.0 Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang --- qemu/roms/ipxe/src/core/xferbuf.c | 108 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 qemu/roms/ipxe/src/core/xferbuf.c (limited to 'qemu/roms/ipxe/src/core/xferbuf.c') diff --git a/qemu/roms/ipxe/src/core/xferbuf.c b/qemu/roms/ipxe/src/core/xferbuf.c new file mode 100644 index 000000000..a0457feee --- /dev/null +++ b/qemu/roms/ipxe/src/core/xferbuf.c @@ -0,0 +1,108 @@ +/* + * Copyright (C) 2012 Michael Brown . + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include +#include +#include +#include +#include +#include + +/** @file + * + * Data transfer buffer + * + */ + +/** + * Finish using data transfer buffer + * + * @v xferbuf Data transfer buffer + */ +void xferbuf_done ( struct xfer_buffer *xferbuf ) { + free ( xferbuf->data ); + xferbuf->data = NULL; + xferbuf->len = 0; + xferbuf->pos = 0; +} + +/** + * Ensure that data transfer buffer is large enough for the specified size + * + * @v xferbuf Data transfer buffer + * @v len Required minimum size + * @ret rc Return status code + */ +static int xferbuf_ensure_size ( struct xfer_buffer *xferbuf, size_t len ) { + void *new_data; + + /* If buffer is already large enough, do nothing */ + if ( len <= xferbuf->len ) + return 0; + + /* Extend buffer */ + new_data = realloc ( xferbuf->data, len ); + if ( ! new_data ) { + DBGC ( xferbuf, "XFERBUF %p could not extend buffer to " + "%zd bytes\n", xferbuf, len ); + return -ENOSPC; + } + xferbuf->data = new_data; + xferbuf->len = len; + + return 0; +} + +/** + * Add received data to data transfer buffer + * + * @v xferbuf Data transfer buffer + * @v iobuf I/O buffer + * @v meta Data transfer metadata + * @ret rc Return status code + */ +int xferbuf_deliver ( struct xfer_buffer *xferbuf, struct io_buffer *iobuf, + struct xfer_metadata *meta ) { + size_t len; + size_t max; + int rc; + + /* Calculate new buffer position */ + if ( meta->flags & XFER_FL_ABS_OFFSET ) + xferbuf->pos = 0; + xferbuf->pos += meta->offset; + + /* Ensure that we have enough buffer space for this data */ + len = iob_len ( iobuf ); + max = ( xferbuf->pos + len ); + if ( ( rc = xferbuf_ensure_size ( xferbuf, max ) ) != 0 ) + goto done; + + /* Copy data to buffer */ + memcpy ( ( xferbuf->data + xferbuf->pos ), iobuf->data, len ); + + /* Update current buffer position */ + xferbuf->pos += len; + + done: + free_iob ( iobuf ); + return rc; +} -- cgit 1.2.3-korg