83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
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/**
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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 2009 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 memory buffer.
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*
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* \author Francesco Sacchi <batt@develer.com>
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*/
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#include "kfile_mem.h"
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#include <io/kfile.h>
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#include <string.h>
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static size_t kfilemem_read(struct KFile *_fd, void *buf, size_t size)
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{
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KFileMem *fd = KFILEMEM_CAST(_fd);
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size = MIN((kfile_off_t)size, fd->fd.size - fd->fd.seek_pos);
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uint8_t *mem = (uint8_t *)fd->mem;
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memcpy(buf, mem + fd->fd.seek_pos, size);
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fd->fd.seek_pos += size;
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return size;
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}
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static size_t kfilemem_write(struct KFile *_fd, const void *buf, size_t size)
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{
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KFileMem *fd = KFILEMEM_CAST(_fd);
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size = MIN((kfile_off_t)size, fd->fd.size - fd->fd.seek_pos);
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uint8_t *mem = (uint8_t *)fd->mem;
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memcpy(mem + fd->fd.seek_pos, buf, size);
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fd->fd.seek_pos += size;
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return size;
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}
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void kfilemem_init(KFileMem *km, void *mem, size_t len)
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{
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ASSERT(km);
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ASSERT(mem);
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ASSERT(len);
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memset(km, 0, sizeof(*km));
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km->mem = mem;
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kfile_init(&km->fd);
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km->fd.read = kfilemem_read;
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km->fd.write = kfilemem_write;
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km->fd.size = len;
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DB(km->fd._type = KFT_KFILEMEM);
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}
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