4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
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11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
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26 * invalidate any other reasons why the executable file might be covered by
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29 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
33 * \brief KFile interface over a KBlock.
35 * \author Francesco Sacchi <batt@develer.com>
36 * \author Daniele Basile <asterix@develer.com>
40 #include "kfile_block.h"
45 * ID for KFile over a KBlock.
47 #define KFT_KFILEBLOCK MAKE_ID('K', 'F', 'B', 'L')
50 * Convert + ASSERT from generic KFile to KFileBlock.
52 INLINE KFileBlock * KFILEBLOCK_CAST(KFile *fd)
54 ASSERT(fd->_type == KFT_KFILEBLOCK);
55 return (KFileBlock *)fd;
58 #define KFILEBLOCK(dir, fd, buf, size) \
60 KFileBlock *fb = KFILEBLOCK_CAST(fd); \
64 block_idx_t id = (fd)->seek_pos / fb->blk->blk_size; \
65 if (id >= fb->blk->blk_cnt) \
67 size_t offset = (fd)->seek_pos % fb->blk->blk_size; \
68 size_t count = MIN(size, (size_t)(fb->blk->blk_size - offset)); \
69 size_t ret_len = kblock_##dir(fb->blk, id, buf, offset, count); \
71 (fd)->seek_pos += ret_len; \
72 buf = buf + ret_len; \
74 if (ret_len != count) \
80 static size_t kfileblock_read(struct KFile *fd, void *_buf, size_t size)
82 uint8_t *buf = (uint8_t *)_buf;
83 return KFILEBLOCK(read, fd, buf, size);
86 static size_t kfileblock_write(struct KFile *fd, const void *_buf, size_t size)
88 const uint8_t *buf = (const uint8_t *)_buf;
89 return KFILEBLOCK(write, fd, buf, size);
92 static int kfileblock_flush(struct KFile *fd)
94 KFileBlock *fb = KFILEBLOCK_CAST(fd);
95 return kblock_flush(fb->blk);
98 static int kfileblock_error(struct KFile *fd)
100 KFileBlock *fb = KFILEBLOCK_CAST(fd);
101 return kblock_error(fb->blk);
104 static void kfileblock_clearerr(struct KFile *fd)
106 KFileBlock *fb = KFILEBLOCK_CAST(fd);
107 return kblock_clearerr(fb->blk);
110 static int kfileblock_close(struct KFile *fd)
112 KFileBlock *fb = KFILEBLOCK_CAST(fd);
113 return kblock_close(fb->blk);
116 void kfileblock_init(KFileBlock *fb, KBlock *blk)
120 memset(fb, 0, sizeof(*fb));
122 DB(fb->fd._type = KFT_KFILEBLOCK);
124 fb->fd.size = blk->blk_cnt * blk->blk_size;
125 fb->fd.read = kfileblock_read;
126 fb->fd.write = kfileblock_write;
127 fb->fd.flush = kfileblock_flush;
128 fb->fd.error = kfileblock_error;
129 fb->fd.clearerr = kfileblock_clearerr;
130 fb->fd.close = kfileblock_close;