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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2024 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "mboot.h"
#include "vfs.h"
#if MBOOT_FSLOAD && MBOOT_VFS_RAW
#ifndef MIN
#define MIN(x, y) ((x) < (y) ? (x) : (y))
#endif
int vfs_raw_mount(vfs_raw_context_t *ctx, mboot_addr_t seg0_base_addr, mboot_addr_t seg0_byte_len, mboot_addr_t seg1_base_addr, mboot_addr_t seg1_byte_len) {
ctx->seg0_base_addr = seg0_base_addr;
ctx->seg0_byte_len = seg0_byte_len;
ctx->seg1_base_addr = seg1_base_addr;
ctx->seg1_byte_len = seg1_byte_len;
return 0;
}
static int vfs_raw_stream_open(void *stream_in, const char *fname) {
vfs_raw_context_t *stream = stream_in;
(void)fname;
stream->file_pos = 0;
return 0;
}
static void vfs_raw_stream_close(void *stream_in) {
(void)stream_in;
}
static int vfs_raw_stream_read(void *stream_in, uint8_t *buf, size_t len) {
vfs_raw_context_t *stream = stream_in;
size_t orig_len = len;
while (len) {
mboot_addr_t addr;
mboot_addr_t remain;
if (stream->file_pos < stream->seg0_byte_len) {
// Reading from segment 0.
mboot_addr_t seg0_pos = stream->file_pos;
addr = stream->seg0_base_addr + seg0_pos;
remain = stream->seg0_byte_len - seg0_pos;
} else {
// Reading from segment 1.
mboot_addr_t seg1_pos = stream->file_pos - stream->seg0_byte_len;
addr = stream->seg1_base_addr + seg1_pos;
remain = stream->seg1_byte_len - seg1_pos;
if (!remain) {
// At the end of segment 1.
break;
}
}
size_t l = MIN(len, remain);
hw_read(addr, l, buf);
stream->file_pos += l;
buf += l;
len -= l;
}
return orig_len - len;
}
const stream_methods_t vfs_raw_stream_methods = {
vfs_raw_stream_open,
vfs_raw_stream_close,
vfs_raw_stream_read,
};
#endif // MBOOT_FSLOAD && MBOOT_VFS_RAW
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