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Add GetPartialObject to MTP example

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Added support for GetPartialObject for better compatibility with Linux file explorers.
This commit is contained in:
Wojciech Klimek
2026-05-13 22:27:57 +02:00
parent e1cb1b5b6f
commit 09f8208f5b
2 changed files with 45 additions and 0 deletions
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44
examples/device/mtp/src/mtp_fs_example.c
View File

@ -143,6 +143,7 @@ static int32_t fs_get_device_properties(tud_mtp_cb_data_t* cb_data);
static int32_t fs_get_object_handles(tud_mtp_cb_data_t* cb_data);
static int32_t fs_get_object_info(tud_mtp_cb_data_t* cb_data);
static int32_t fs_get_object(tud_mtp_cb_data_t* cb_data);
static int32_t fs_get_partial_object(tud_mtp_cb_data_t* cb_data);
static int32_t fs_delete_object(tud_mtp_cb_data_t* cb_data);
static int32_t fs_send_object_info(tud_mtp_cb_data_t* cb_data);
static int32_t fs_send_object(tud_mtp_cb_data_t* cb_data);
@ -164,6 +165,7 @@ fs_op_handler_dict_t fs_op_handler_dict[] = {
{ MTP_OP_GET_OBJECT_HANDLES, fs_get_object_handles },
{ MTP_OP_GET_OBJECT_INFO, fs_get_object_info },
{ MTP_OP_GET_OBJECT, fs_get_object },
{ MTP_OP_GET_PARTIAL_OBJECT, fs_get_partial_object },
{ MTP_OP_DELETE_OBJECT, fs_delete_object },
{ MTP_OP_SEND_OBJECT_INFO, fs_send_object_info },
{ MTP_OP_SEND_OBJECT, fs_send_object },
@ -330,6 +332,14 @@ int32_t tud_mtp_data_complete_cb(tud_mtp_cb_data_t* cb_data) {
break;
}
case MTP_OP_GET_PARTIAL_OBJECT: {
// response parameter: actual length of data sent excluding container header
const uint32_t len = cb_data->total_xferred_bytes - sizeof(mtp_container_header_t);
(void) mtp_container_add_uint32(resp, len);
resp->header->code = MTP_RESP_OK;
break;
}
default:
resp->header->code = (cb_data->xfer_result == XFER_RESULT_SUCCESS) ? MTP_RESP_OK : MTP_RESP_GENERAL_ERROR;
break;
@ -535,6 +545,40 @@ static int32_t fs_get_object(tud_mtp_cb_data_t* cb_data) {
return 0;
}
static int32_t fs_get_partial_object(tud_mtp_cb_data_t* cb_data) {
const mtp_container_command_t* command = cb_data->command_container;
mtp_container_info_t* io_container = &cb_data->io_container;
const uint32_t obj_handle = command->params[0];
const uint32_t req_offset = command->params[1];
const uint32_t req_max = command->params[2];
const fs_file_t* f = fs_get_file(obj_handle);
if (f == NULL) {
return MTP_RESP_INVALID_OBJECT_HANDLE;
}
const uint32_t avail = (req_offset >= f->size) ? 0u : (f->size - req_offset);
const uint32_t to_send = tu_min32(avail, req_max);
if (cb_data->phase == MTP_PHASE_COMMAND) {
// If file contents is larger than CFG_TUD_MTP_EP_BUFSIZE, data may only partially be added here
// the rest will be sent in tud_mtp_data_more_cb
(void) mtp_container_add_raw(io_container, f->data + req_offset, to_send);
tud_mtp_data_send(io_container);
} else if (cb_data->phase == MTP_PHASE_DATA) {
// continue sending remaining data: file contents offset is xferred byte minus header size
const uint32_t offset = cb_data->total_xferred_bytes - sizeof(mtp_container_header_t);
const uint32_t xact_len = tu_min32(to_send - offset, io_container->payload_bytes);
if (xact_len > 0) {
memcpy(io_container->payload, f->data + offset + req_offset, xact_len);
tud_mtp_data_send(io_container);
}
} else {
// nothing to do
}
return 0;
}
static int32_t fs_send_object_info(tud_mtp_cb_data_t* cb_data) {
const mtp_container_command_t* command = cb_data->command_container;
mtp_container_info_t* io_container = &cb_data->io_container;

1
examples/device/mtp/src/tusb_config.h
View File

@ -106,6 +106,7 @@
MTP_OP_GET_OBJECT_HANDLES, \
MTP_OP_GET_OBJECT_INFO, \
MTP_OP_GET_OBJECT, \
MTP_OP_GET_PARTIAL_OBJECT, \
MTP_OP_DELETE_OBJECT, \
MTP_OP_SEND_OBJECT_INFO, \
MTP_OP_SEND_OBJECT, \