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