132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief KFile interface over a KBlock.
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*
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* \author Francesco Sacchi <batt@develer.com>
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* \author Daniele Basile <asterix@develer.com>
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*
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*/
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#include "kfile_block.h"
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#include <string.h>
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/**
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* ID for KFile over a KBlock.
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*/
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#define KFT_KFILEBLOCK MAKE_ID('K', 'F', 'B', 'L')
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/**
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* Convert + ASSERT from generic KFile to KFileBlock.
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*/
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INLINE KFileBlock * KFILEBLOCK_CAST(KFile *fd)
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{
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ASSERT(fd->_type == KFT_KFILEBLOCK);
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return (KFileBlock *)fd;
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}
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#define KFILEBLOCK(dir, fd, buf, size) \
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({ \
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KFileBlock *fb = KFILEBLOCK_CAST(fd); \
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size_t len = 0; \
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while (size) \
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{ \
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block_idx_t id = (fd)->seek_pos / fb->blk->blk_size; \
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if (id >= fb->blk->blk_cnt) \
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break; \
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size_t offset = (fd)->seek_pos % fb->blk->blk_size; \
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size_t count = MIN(size, (size_t)(fb->blk->blk_size - offset)); \
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size_t ret_len = kblock_##dir(fb->blk, id, buf, offset, count); \
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size -= ret_len; \
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(fd)->seek_pos += ret_len; \
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buf = buf + ret_len; \
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len += ret_len; \
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if (ret_len != count) \
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break; \
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} \
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len; \
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})
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static size_t kfileblock_read(struct KFile *fd, void *_buf, size_t size)
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{
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uint8_t *buf = (uint8_t *)_buf;
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return KFILEBLOCK(read, fd, buf, size);
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}
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static size_t kfileblock_write(struct KFile *fd, const void *_buf, size_t size)
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{
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const uint8_t *buf = (const uint8_t *)_buf;
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return KFILEBLOCK(write, fd, buf, size);
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}
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static int kfileblock_flush(struct KFile *fd)
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{
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KFileBlock *fb = KFILEBLOCK_CAST(fd);
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return kblock_flush(fb->blk);
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}
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static int kfileblock_error(struct KFile *fd)
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{
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KFileBlock *fb = KFILEBLOCK_CAST(fd);
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return kblock_error(fb->blk);
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}
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static void kfileblock_clearerr(struct KFile *fd)
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{
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KFileBlock *fb = KFILEBLOCK_CAST(fd);
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return kblock_clearerr(fb->blk);
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}
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static int kfileblock_close(struct KFile *fd)
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{
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KFileBlock *fb = KFILEBLOCK_CAST(fd);
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return kblock_close(fb->blk);
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}
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void kfileblock_init(KFileBlock *fb, KBlock *blk)
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{
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ASSERT(fb);
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ASSERT(blk);
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memset(fb, 0, sizeof(*fb));
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kfile_init(&fb->fd);
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DB(fb->fd._type = KFT_KFILEBLOCK);
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fb->blk = blk;
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fb->fd.size = blk->blk_cnt * blk->blk_size;
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fb->fd.read = kfileblock_read;
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fb->fd.write = kfileblock_write;
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fb->fd.flush = kfileblock_flush;
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fb->fd.error = kfileblock_error;
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fb->fd.clearerr = kfileblock_clearerr;
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fb->fd.close = kfileblock_close;
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}
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