vfs/module/avr/progmem.h

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/*
 * Copyright (c) 2024 ykat UG (haftungsbeschraenkt) - All Rights Reserved
 *
 * Permission for non-commercial use is hereby granted,
 * free of charge, without warranty of any kind.
 */
#ifndef ZRTOS_VFS_MODULE_AVR_PROGMEM_H
#define ZRTOS_VFS_MODULE_AVR_PROGMEM_H
#ifdef __cplusplus
extern "C" {
#endif


#include <avr/pgmspace.h >

#include <zrtos/error.h>
#include <zrtos/types.h>
#include <zrtos/vfs_plugin.h>


typedef struct _zrtos_vfs_module_avr_progmem_inode_t{
    uint32_t start_addr;
    uint32_t end_addr;
}zrtos_vfs_module_avr_progmem_inode_t;


zrtos_error_t zrtos_vfs_module_avr_progmem__on_read(
     zrtos_vfs_file_t *thiz
    ,char *path
    ,void *buf
    ,size_t len
    ,zrtos_vfs_offset_t offset
    ,size_t *out
){
    zrtos_error_t ret = ZRTOS_ERROR__FAULT;
    zrtos_vfs_module_avr_progmem_inode_t *mod = zrtos_vfs_file__get_inode_data(
        thiz
    );
    uint32_t addr = offset;
    uint8_t *data_ptr = data;

    if(offset > ZRTOS_TYPES__UINT32_MAX){
        ret = ZRTOS_ERROR__INVAL;
        goto L_OUT;
    }

    if(zrtos_types__uint32_is_valid_address_range(
         mod->start_addr
        ,mod->end_addr
        ,addr
        ,&len
    )){
        *ret = len;
        for(;len--;addr++){
            *data_ptr++ = pgm_read_byte_far(addr);
        }
        ret = ZRTOS_ERROR__SUCCESS;
    }

L_OUT:
    return ret;
}

ZRTOS_VFS_PLUGIN__INIT(zero,
    ZRTOS_VFS_PLUGIN__ON_READ(zrtos_vfs_module_avr_progmem__on_read)
);


#ifdef __cplusplus
}
#endif
#endif