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circuitpython/supervisor/shared/bluetooth/file_transfer.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019-2021 Scott Shawcroft for Adafruit Industries
*
* 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 <string.h>
#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "shared/timeutils/timeutils.h"
#include "shared-bindings/_bleio/__init__.h"
#include "shared-bindings/_bleio/Adapter.h"
#include "shared-bindings/_bleio/Characteristic.h"
#include "shared-bindings/_bleio/PacketBuffer.h"
#include "shared-bindings/_bleio/Service.h"
#include "shared-bindings/_bleio/UUID.h"
#include "shared-module/storage/__init__.h"
#include "bluetooth/ble_drv.h"
#include "common-hal/_bleio/__init__.h"
#include "supervisor/fatfs.h"
#include "supervisor/filesystem.h"
#include "supervisor/shared/reload.h"
#include "supervisor/shared/bluetooth/file_transfer.h"
#include "supervisor/shared/bluetooth/file_transfer_protocol.h"
#include "supervisor/shared/workflow.h"
#include "supervisor/shared/tick.h"
#include "supervisor/usb.h"
#include "py/mpstate.h"
STATIC bleio_service_obj_t supervisor_ble_service;
STATIC bleio_uuid_obj_t supervisor_ble_service_uuid;
STATIC bleio_characteristic_obj_t supervisor_ble_version_characteristic;
STATIC bleio_uuid_obj_t supervisor_ble_version_uuid;
STATIC bleio_characteristic_obj_t supervisor_ble_transfer_characteristic;
STATIC bleio_uuid_obj_t supervisor_ble_transfer_uuid;
// This is the base UUID for the file transfer service.
const uint8_t file_transfer_base_uuid[16] = {0x72, 0x65, 0x66, 0x73, 0x6e, 0x61, 0x72, 0x54, 0x65, 0x6c, 0x69, 0x46, 0x00, 0x00, 0xaf, 0xad };
STATIC mp_obj_list_t characteristic_list;
STATIC mp_obj_t characteristic_list_items[2];
// 2 * 10 ringbuf packets, 512 for a disk sector and 12 for the file transfer write header.
#define PACKET_BUFFER_SIZE (2 * 10 + 512 + 12)
// uint32_t so its aligned
STATIC uint32_t _buffer[PACKET_BUFFER_SIZE / 4 + 1];
STATIC uint32_t _outgoing1[BLE_GATTS_VAR_ATTR_LEN_MAX / 4];
STATIC uint32_t _outgoing2[BLE_GATTS_VAR_ATTR_LEN_MAX / 4];
STATIC ble_drv_evt_handler_entry_t static_handler_entry;
STATIC bleio_packet_buffer_obj_t _transfer_packet_buffer;
void supervisor_start_bluetooth_file_transfer(void) {
supervisor_ble_service_uuid.base.type = &bleio_uuid_type;
common_hal_bleio_uuid_construct(&supervisor_ble_service_uuid, 0xfebb, NULL);
// We know we'll only be 1 characteristic so we can statically allocate it.
characteristic_list.base.type = &mp_type_list;
characteristic_list.alloc = sizeof(characteristic_list_items) / sizeof(characteristic_list_items[0]);
characteristic_list.len = 0;
characteristic_list.items = characteristic_list_items;
mp_seq_clear(characteristic_list.items, 0, characteristic_list.alloc, sizeof(*characteristic_list.items));
_common_hal_bleio_service_construct(&supervisor_ble_service, &supervisor_ble_service_uuid, false /* is secondary */, &characteristic_list);
// Version number
supervisor_ble_version_uuid.base.type = &bleio_uuid_type;
common_hal_bleio_uuid_construct(&supervisor_ble_version_uuid, 0x0100, file_transfer_base_uuid);
common_hal_bleio_characteristic_construct(&supervisor_ble_version_characteristic,
&supervisor_ble_service,
0, // handle (for remote only)
&supervisor_ble_version_uuid,
CHAR_PROP_READ,
SECURITY_MODE_OPEN,
SECURITY_MODE_NO_ACCESS,
4, // max length
true, // fixed length
NULL, // no initial value
NULL); // no description
uint32_t version = 4;
mp_buffer_info_t bufinfo;
bufinfo.buf = &version;
bufinfo.len = sizeof(version);
common_hal_bleio_characteristic_set_value(&supervisor_ble_version_characteristic, &bufinfo);
// Active filename.
supervisor_ble_transfer_uuid.base.type = &bleio_uuid_type;
common_hal_bleio_uuid_construct(&supervisor_ble_transfer_uuid, 0x0200, file_transfer_base_uuid);
common_hal_bleio_characteristic_construct(&supervisor_ble_transfer_characteristic,
&supervisor_ble_service,
0, // handle (for remote only)
&supervisor_ble_transfer_uuid,
CHAR_PROP_READ | CHAR_PROP_WRITE_NO_RESPONSE | CHAR_PROP_NOTIFY,
SECURITY_MODE_ENC_NO_MITM,
SECURITY_MODE_ENC_NO_MITM,
BLE_GATTS_VAR_ATTR_LEN_MAX, // max length
false, // fixed length
NULL, // no initial valuen
NULL);
_common_hal_bleio_packet_buffer_construct(
&_transfer_packet_buffer, &supervisor_ble_transfer_characteristic,
_buffer, PACKET_BUFFER_SIZE,
_outgoing1, _outgoing2, BLE_GATTS_VAR_ATTR_LEN_MAX,
&static_handler_entry);
}
#define COMMAND_SIZE 1024
#define ANY_COMMAND 0x00
#define THIS_COMMAND 0x01
// FATFS has a two second timestamp resolution but the BLE API allows for nanosecond resolution.
// This function truncates the time the time to a resolution storable by FATFS and fills in the
// FATFS encoded version into fattime.
STATIC uint64_t truncate_time(uint64_t input_time, DWORD *fattime) {
timeutils_struct_time_t tm;
uint64_t seconds_since_epoch = timeutils_seconds_since_epoch_from_nanoseconds_since_1970(input_time);
timeutils_seconds_since_epoch_to_struct_time(seconds_since_epoch, &tm);
uint64_t truncated_time = timeutils_nanoseconds_since_epoch_to_nanoseconds_since_1970((seconds_since_epoch / 2) * 2 * 1000000000);
*fattime = ((tm.tm_year - 1980) << 25) | (tm.tm_mon << 21) | (tm.tm_mday << 16) |
(tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1);
return truncated_time;
}
// Used by read and write.
STATIC FIL active_file;
STATIC uint8_t _process_read(const uint8_t *raw_buf, size_t command_len) {
struct read_command *command = (struct read_command *)raw_buf;
size_t header_size = sizeof(struct read_command);
size_t response_size = sizeof(struct read_data);
uint8_t data_buffer[response_size];
struct read_data response;
response.command = READ_DATA;
response.status = STATUS_OK;
if (command->path_length > (COMMAND_SIZE - response_size - 1)) { // -1 for the null we'll write
// TODO: throw away any more packets of path.
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, response_size, NULL, 0);
return ANY_COMMAND;
}
// We need to receive another packet to have the full path.
if (command_len < header_size + command->path_length) {
return THIS_COMMAND;
}
char *path = (char *)((uint8_t *)command) + header_size;
path[command->path_length] = '\0';
FATFS *fs = filesystem_circuitpy();
FRESULT result = f_open(fs, &active_file, path, FA_READ);
if (result != FR_OK) {
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, response_size, NULL, 0);
return ANY_COMMAND;
}
uint32_t total_length = f_size(&active_file);
// Write out the response header.
uint32_t offset = command->chunk_offset;
uint32_t chunk_size = command->chunk_size;
chunk_size = MIN(chunk_size, total_length - offset);
response.chunk_offset = offset;
response.total_length = total_length;
response.data_size = chunk_size;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, response_size, NULL, 0);
f_lseek(&active_file, offset);
// Write out the chunk contents. We can do this in small pieces because PacketBuffer
// will assemble them into larger packets of its own.
size_t chunk_end = offset + chunk_size;
while (offset < chunk_end) {
size_t quantity_read;
size_t read_amount = MIN(response_size, chunk_end - offset);
f_read(&active_file, data_buffer, read_amount, &quantity_read);
offset += quantity_read;
// TODO: Do something if the read fails
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, data_buffer, quantity_read, NULL, 0);
}
if (offset >= total_length) {
f_close(&active_file);
return ANY_COMMAND;
}
return READ_PACING;
}
STATIC uint8_t _process_read_pacing(const uint8_t *raw_buf, size_t command_len) {
struct read_pacing *command = (struct read_pacing *)raw_buf;
struct read_data response;
response.command = READ_DATA;
response.status = STATUS_OK;
size_t response_size = sizeof(struct read_data);
uint32_t total_length = f_size(&active_file);
// Write out the response header.
uint32_t chunk_size = MIN(command->chunk_size, total_length - command->chunk_offset);
response.chunk_offset = command->chunk_offset;
response.total_length = total_length;
response.data_size = chunk_size;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, response_size, NULL, 0);
f_lseek(&active_file, command->chunk_offset);
// Write out the chunk contents. We can do this in small pieces because PacketBuffer
// will assemble them into larger packets of its own.
size_t chunk_offset = 0;
uint8_t data[20];
while (chunk_offset < chunk_size) {
size_t quantity_read;
size_t read_size = MIN(chunk_size - chunk_offset, sizeof(data));
FRESULT result = f_read(&active_file, &data, read_size, &quantity_read);
if (quantity_read == 0 || result != FR_OK) {
// TODO: If we can't read everything, then the file must have been shortened. Maybe we
// should return 0s to pad it out.
break;
}
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&data, quantity_read, NULL, 0);
chunk_offset += quantity_read;
}
if ((chunk_offset + chunk_size) >= total_length) {
f_close(&active_file);
return ANY_COMMAND;
}
return READ_PACING;
}
// Used by write and write data to know when the write is complete.
STATIC size_t total_write_length;
STATIC uint64_t _truncated_time;
// Returns true if usb is active and replies with an error if so. If not, it grabs
// the USB mass storage lock and returns false. Make sure to release the lock with
// usb_msc_unlock() when the transaction is complete.
STATIC bool _usb_active(void *response, size_t response_size) {
// Check to see if USB has already been mounted. If not, then we "eject" from USB until we're done.
#if CIRCUITPY_USB && CIRCUITPY_USB_MSC
if (storage_usb_enabled() && !usb_msc_lock()) {
// Status is always the second byte of the response.
((uint8_t *)response)[1] = STATUS_ERROR_READONLY;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)response, response_size, NULL, 0);
return true;
}
#endif
return false;
}
STATIC uint8_t _process_write(const uint8_t *raw_buf, size_t command_len) {
struct write_command *command = (struct write_command *)raw_buf;
size_t header_size = sizeof(struct write_command);
struct write_pacing response;
response.command = WRITE_PACING;
response.status = STATUS_OK;
if (command->path_length > (COMMAND_SIZE - header_size - 1)) { // -1 for the null we'll write
// TODO: throw away any more packets of path.
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct write_pacing), NULL, 0);
return ANY_COMMAND;
}
// We need to receive another packet to have the full path.
if (command_len < header_size + command->path_length) {
return THIS_COMMAND;
}
total_write_length = command->total_length;
char *path = (char *)command->path;
path[command->path_length] = '\0';
if (_usb_active(&response, sizeof(struct write_pacing))) {
return ANY_COMMAND;
}
FATFS *fs = filesystem_circuitpy();
DWORD fattime;
_truncated_time = truncate_time(command->modification_time, &fattime);
override_fattime(fattime);
FRESULT result = f_open(fs, &active_file, path, FA_WRITE | FA_OPEN_ALWAYS);
if (result != FR_OK) {
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct write_pacing), NULL, 0);
#if CIRCUITPY_USB_MSC
usb_msc_unlock();
#endif
override_fattime(0);
return ANY_COMMAND;
}
// Write out the pacing response.
// Align the next chunk to a sector boundary.
uint32_t offset = command->offset;
size_t chunk_size = MIN(total_write_length - offset, 512 - (offset % 512));
// Special case when truncating the file. (Deleting stuff off the end.)
if (chunk_size == 0) {
f_lseek(&active_file, offset);
f_truncate(&active_file);
f_close(&active_file);
override_fattime(0);
#if CIRCUITPY_USB_MSC
usb_msc_unlock();
#endif
}
response.offset = offset;
response.free_space = chunk_size;
response.truncated_time = _truncated_time;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct write_pacing), NULL, 0);
if (chunk_size == 0) {
// Don't reload until everything is written out of the packet buffer.
common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
return ANY_COMMAND;
}
return WRITE_DATA;
}
STATIC uint8_t _process_write_data(const uint8_t *raw_buf, size_t command_len) {
struct write_data *command = (struct write_data *)raw_buf;
size_t header_size = sizeof(struct write_data);
struct write_pacing response;
response.command = WRITE_PACING;
response.status = STATUS_OK;
if (command->data_size > (COMMAND_SIZE - header_size - 1)) { // -1 for the null we'll write
// TODO: throw away any more packets of path.
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct write_pacing), NULL, 0);
#if CIRCUITPY_USB_MSC
usb_msc_unlock();
#endif
override_fattime(0);
return ANY_COMMAND;
}
// We need to receive another packet to have the full path.
if (command_len < header_size + command->data_size) {
return THIS_COMMAND;
}
uint32_t offset = command->offset;
f_lseek(&active_file, offset);
UINT actual;
f_write(&active_file, command->data, command->data_size, &actual);
if (actual < command->data_size) { // -1 for the null we'll write
// TODO: throw away any more packets of path.
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct write_pacing), NULL, 0);
#if CIRCUITPY_USB_MSC
usb_msc_unlock();
#endif
override_fattime(0);
return ANY_COMMAND;
}
offset += command->data_size;
// Align the next chunk to a sector boundary.
size_t chunk_size = MIN(total_write_length - offset, 512);
response.offset = offset;
response.free_space = chunk_size;
response.truncated_time = _truncated_time;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct write_pacing), NULL, 0);
if (total_write_length == offset) {
f_truncate(&active_file);
f_close(&active_file);
override_fattime(0);
#if CIRCUITPY_USB_MSC
usb_msc_unlock();
#endif
// Don't reload until everything is written out of the packet buffer.
common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
return ANY_COMMAND;
}
return WRITE_DATA;
}
STATIC uint8_t _process_delete(const uint8_t *raw_buf, size_t command_len) {
const struct delete_command *command = (struct delete_command *)raw_buf;
size_t header_size = sizeof(struct delete_command);
struct delete_status response;
response.command = DELETE_STATUS;
response.status = STATUS_OK;
if (command->path_length > (COMMAND_SIZE - header_size - 1)) { // -1 for the null we'll write
// TODO: throw away any more packets of path.
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct delete_status), NULL, 0);
return ANY_COMMAND;
}
if (_usb_active(&response, sizeof(struct delete_status))) {
return ANY_COMMAND;
}
// We need to receive another packet to have the full path.
if (command_len < header_size + command->path_length) {
return THIS_COMMAND;
}
FATFS *fs = filesystem_circuitpy();
char *path = (char *)((uint8_t *)command) + header_size;
path[command->path_length] = '\0';
FILINFO file;
FRESULT result = f_stat(fs, path, &file);
if (result == FR_OK) {
if ((file.fattrib & AM_DIR) != 0) {
result = supervisor_workflow_delete_directory_contents(fs, path);
}
if (result == FR_OK) {
result = f_unlink(fs, path);
}
}
#if CIRCUITPY_USB_MSC
usb_msc_unlock();
#endif
if (result != FR_OK) {
response.status = STATUS_ERROR;
}
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct delete_status), NULL, 0);
if (result == FR_OK) {
// Don't reload until everything is written out of the packet buffer.
common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
}
return ANY_COMMAND;
}
// NULL-terminate the path and remove any trailing /. Older versions of the
// protocol require it but newer ones do not.
STATIC void _terminate_path(char *path, size_t path_length) {
// -1 because fatfs doesn't want a trailing /
if (path[path_length - 1] == '/') {
path[path_length - 1] = '\0';
} else {
path[path_length] = '\0';
}
}
STATIC uint8_t _process_mkdir(const uint8_t *raw_buf, size_t command_len) {
const struct mkdir_command *command = (struct mkdir_command *)raw_buf;
size_t header_size = sizeof(struct mkdir_command);
struct mkdir_status response;
response.command = MKDIR_STATUS;
response.status = STATUS_OK;
if (command->path_length > (COMMAND_SIZE - header_size - 1)) { // -1 for the null we'll write
// TODO: throw away any more packets of path.
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct mkdir_status), NULL, 0);
return ANY_COMMAND;
}
if (_usb_active(&response, sizeof(struct mkdir_status))) {
return ANY_COMMAND;
}
// We need to receive another packet to have the full path.
if (command_len < header_size + command->path_length) {
return THIS_COMMAND;
}
FATFS *fs = filesystem_circuitpy();
char *path = (char *)command->path;
_terminate_path(path, command->path_length);
DWORD fattime;
response.truncated_time = truncate_time(command->modification_time, &fattime);
override_fattime(fattime);
FRESULT result = supervisor_workflow_mkdir_parents(fs, path);
override_fattime(0);
#if CIRCUITPY_USB_MSC
usb_msc_unlock();
#endif
if (result != FR_OK) {
response.status = STATUS_ERROR;
}
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct mkdir_status), NULL, 0);
if (result == FR_OK) {
// Don't reload until everything is written out of the packet buffer.
common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
}
return ANY_COMMAND;
}
STATIC void send_listdir_entry_header(const struct listdir_entry *entry, mp_int_t max_packet_size) {
mp_int_t response_size = sizeof(struct listdir_entry);
if (max_packet_size >= response_size) {
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)entry, response_size, NULL, 0);
return;
}
// Split into 16 + 12 size packets to fit into 20 byte minimum packet size.
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)entry, 16, NULL, 0);
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, ((const uint8_t *)entry) + 16, response_size - 16, NULL, 0);
}
STATIC uint8_t _process_listdir(uint8_t *raw_buf, size_t command_len) {
const struct listdir_command *command = (struct listdir_command *)raw_buf;
struct listdir_entry *entry = (struct listdir_entry *)raw_buf;
size_t header_size = sizeof(struct listdir_command);
mp_int_t max_packet_size = common_hal_bleio_packet_buffer_get_outgoing_packet_length(&_transfer_packet_buffer);
if (max_packet_size < 0) {
// -1 means we're disconnected
return ANY_COMMAND;
}
// We reuse the command buffer so that we can produce long packets without
// making the stack large.
if (command->path_length > (COMMAND_SIZE - header_size - 1)) { // -1 for the null we'll write
// TODO: throw away any more packets of path.
entry->command = LISTDIR_ENTRY;
entry->status = STATUS_ERROR;
send_listdir_entry_header(entry, max_packet_size);
return ANY_COMMAND;
}
// We need to receive another packet to have the full path.
if (command_len < header_size + command->path_length) {
return THIS_COMMAND;
}
FATFS *fs = filesystem_circuitpy();
char *path = (char *)&command->path;
_terminate_path(path, command->path_length);
// mp_printf(&mp_plat_print, "list %s\n", path);
FF_DIR dir;
FRESULT res = f_opendir(fs, &dir, path);
entry->command = LISTDIR_ENTRY;
entry->status = STATUS_OK;
entry->path_length = 0;
entry->entry_number = 0;
entry->entry_count = 0;
entry->flags = 0;
if (res != FR_OK) {
entry->status = STATUS_ERROR_NO_FILE;
send_listdir_entry_header(entry, max_packet_size);
return ANY_COMMAND;
}
FILINFO file_info;
res = f_readdir(&dir, &file_info);
char *fn = file_info.fname;
size_t total_entries = 0;
while (res == FR_OK && fn[0] != 0) {
res = f_readdir(&dir, &file_info);
total_entries += 1;
}
// Rewind the directory.
f_readdir(&dir, NULL);
entry->entry_count = total_entries;
for (size_t i = 0; i < total_entries; i++) {
res = f_readdir(&dir, &file_info);
entry->entry_number = i;
uint64_t truncated_time = timeutils_mktime(1980 + (file_info.fdate >> 9),
(file_info.fdate >> 5) & 0xf,
file_info.fdate & 0x1f,
file_info.ftime >> 11,
(file_info.ftime >> 5) & 0x1f,
(file_info.ftime & 0x1f) * 2) * 1000000000ULL;
entry->truncated_time = truncated_time;
if ((file_info.fattrib & AM_DIR) != 0) {
entry->flags = 1; // Directory
entry->file_size = 0;
} else {
entry->flags = 0;
entry->file_size = file_info.fsize;
}
size_t name_length = strlen(file_info.fname);
entry->path_length = name_length;
send_listdir_entry_header(entry, max_packet_size);
size_t fn_offset = 0;
while (fn_offset < name_length) {
size_t fn_size = MIN(name_length - fn_offset, 4);
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, ((uint8_t *)file_info.fname) + fn_offset, fn_size, NULL, 0);
fn_offset += fn_size;
}
}
f_closedir(&dir);
entry->path_length = 0;
entry->entry_number = entry->entry_count;
entry->flags = 0;
entry->file_size = 0;
send_listdir_entry_header(entry, max_packet_size);
return ANY_COMMAND;
}
STATIC uint8_t _process_move(const uint8_t *raw_buf, size_t command_len) {
const struct move_command *command = (struct move_command *)raw_buf;
size_t header_size = sizeof(struct move_command);
struct move_status response;
response.command = MOVE_STATUS;
response.status = STATUS_OK;
// +2 for null terminators.
uint32_t total_path_length = command->old_path_length + command->new_path_length + 1;
if (total_path_length > (COMMAND_SIZE - header_size - 1)) {
// TODO: throw away any more packets of path.
response.status = STATUS_ERROR;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct move_status), NULL, 0);
return ANY_COMMAND;
}
if (_usb_active(&response, sizeof(struct move_status))) {
return ANY_COMMAND;
}
// We need to receive another packet to have the full path.
if (command_len < header_size + total_path_length) {
return THIS_COMMAND;
}
FATFS *fs = filesystem_circuitpy();
char *old_path = (char *)command->paths;
old_path[command->old_path_length] = '\0';
char *new_path = old_path + command->old_path_length + 1;
new_path[command->new_path_length] = '\0';
// mp_printf(&mp_plat_print, "move %s to %s\n", old_path, new_path);
FRESULT result = f_rename(fs, old_path, new_path);
#if CIRCUITPY_USB_MSC
usb_msc_unlock();
#endif
if (result != FR_OK) {
response.status = STATUS_ERROR;
}
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, (const uint8_t *)&response, sizeof(struct move_status), NULL, 0);
if (result == FR_OK) {
// Don't reload until everything is written out of the packet buffer.
common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
}
return ANY_COMMAND;
}
// Background state that must live across background calls. After the _process
// helpers to force them to not use them.
STATIC uint8_t current_command[COMMAND_SIZE] __attribute__ ((aligned(4)));
STATIC volatile size_t current_offset;
STATIC uint8_t next_command;
STATIC bool running = false;
void supervisor_bluetooth_file_transfer_background(void) {
if (running) {
return;
}
running = true;
mp_int_t size = 1;
while (size > 0) {
size = common_hal_bleio_packet_buffer_readinto(&_transfer_packet_buffer, current_command + current_offset, COMMAND_SIZE - current_offset);
if (size == 0) {
break;
}
autoreload_suspend(AUTORELOAD_SUSPEND_BLE);
// TODO: If size < 0 return an error.
current_offset += size;
#if CIRCUITPY_VERBOSE_BLE
mp_printf(&mp_plat_print, "buffer[:%d]:", current_offset);
for (size_t i = 0; i < current_offset; i++) {
mp_printf(&mp_plat_print, " (%x %c)", current_command[i], current_command[i]);
}
mp_printf(&mp_plat_print, "\n");
#endif
uint8_t current_state = current_command[0];
// mp_printf(&mp_plat_print, "current command 0x%02x\n", current_state);
// Check for protocol error.
if (next_command != ANY_COMMAND && next_command != THIS_COMMAND && ((current_state & 0xf) != 0) && current_state != next_command) {
uint8_t response[2];
response[0] = next_command;
response[1] = STATUS_ERROR_PROTOCOL;
common_hal_bleio_packet_buffer_write(&_transfer_packet_buffer, response, 2, NULL, 0);
autoreload_resume(AUTORELOAD_SUSPEND_BLE);
break;
}
switch (current_state) {
case READ:
next_command = _process_read(current_command, current_offset);
break;
case READ_PACING:
next_command = _process_read_pacing(current_command, current_offset);
break;
case WRITE:
next_command = _process_write(current_command, current_offset);
break;
case WRITE_DATA:
next_command = _process_write_data(current_command, current_offset);
break;
case DELETE:
next_command = _process_delete(current_command, current_offset);
break;
case MKDIR:
next_command = _process_mkdir(current_command, current_offset);
break;
case LISTDIR:
next_command = _process_listdir(current_command, current_offset);
break;
case MOVE:
next_command = _process_move(current_command, current_offset);
break;
}
// Preserve the offset if we are waiting for more from this command.
if (next_command != THIS_COMMAND) {
current_offset = 0;
}
if (next_command == ANY_COMMAND) {
autoreload_resume(AUTORELOAD_SUSPEND_BLE);
// Trigger a reload if the command may have mutated the file system.
if (current_state == WRITE ||
current_state == WRITE_DATA ||
current_state == DELETE ||
current_state == MKDIR ||
current_state == MOVE) {
autoreload_trigger();
}
}
}
running = false;
}
void supervisor_bluetooth_file_transfer_disconnected(void) {
next_command = ANY_COMMAND;
current_offset = 0;
f_close(&active_file);
autoreload_resume(AUTORELOAD_SUSPEND_BLE);
}
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