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Re: [Qemu-devel] [PATCH v2 2/2] usb-mtp: added object properties
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From: |
Bandan Das |
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Subject: |
Re: [Qemu-devel] [PATCH v2 2/2] usb-mtp: added object properties |
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Date: |
Wed, 27 Jul 2016 16:41:10 -0400 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Isaac Lozano <address@hidden> writes:
> Windows uses object properties to determine the size of a file, so to
> add object properties, we must also add a minimum set of new commands
> and object properties. Most object properties are data that we already
> have, except for the unique persistant object identifier. Windows
> doesn't use this property, it seems, so we can cheat a bit and just use
> the object handle for it.
>
> Signed-off-by: Isaac Lozano <address@hidden>
> ---
> hw/usb/dev-mtp.c | 186
> +++++++++++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 181 insertions(+), 5 deletions(-)
>
> diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c
> index 6f6a270..fa0c81e 100644
> --- a/hw/usb/dev-mtp.c
> +++ b/hw/usb/dev-mtp.c
> @@ -48,6 +48,9 @@ enum mtp_code {
> CMD_GET_OBJECT_INFO = 0x1008,
> CMD_GET_OBJECT = 0x1009,
> CMD_GET_PARTIAL_OBJECT = 0x101b,
> + CMD_GET_OBJECT_PROPS_SUPPORTED = 0x9801,
> + CMD_GET_OBJECT_PROP_DESC = 0x9802,
> + CMD_GET_OBJECT_PROP_VALUE = 0x9803,
>
> /* response codes */
> RES_OK = 0x2001,
> @@ -59,10 +62,12 @@ enum mtp_code {
> RES_INCOMPLETE_TRANSFER = 0x2007,
> RES_INVALID_STORAGE_ID = 0x2008,
> RES_INVALID_OBJECT_HANDLE = 0x2009,
> + RES_INVALID_OBJECT_FORMAT_CODE = 0x200b,
> RES_SPEC_BY_FORMAT_UNSUPPORTED = 0x2014,
> RES_INVALID_PARENT_OBJECT = 0x201a,
> RES_INVALID_PARAMETER = 0x201d,
> RES_SESSION_ALREADY_OPEN = 0x201e,
> + RES_INVALID_OBJECT_PROP_CODE = 0xA801,
>
> /* format codes */
> FMT_UNDEFINED_OBJECT = 0x3000,
> @@ -72,6 +77,22 @@ enum mtp_code {
> EVT_OBJ_ADDED = 0x4002,
> EVT_OBJ_REMOVED = 0x4003,
> EVT_OBJ_INFO_CHANGED = 0x4007,
> +
> + /* object properties */
> + PROP_STORAGE_ID = 0xDC01,
> + PROP_OBJECT_FORMAT = 0xDC02,
> + PROP_OBJECT_COMPRESSED_SIZE = 0xDC04,
> + PROP_PARENT_OBJECT = 0xDC0B,
> + PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER = 0xDC41,
> + PROP_NAME = 0xDC44,
> +};
> +
> +enum mtp_data_type {
> + DATA_TYPE_UINT16 = 0x0004,
> + DATA_TYPE_UINT32 = 0x0006,
> + DATA_TYPE_UINT64 = 0x0008,
> + DATA_TYPE_UINT128 = 0x000a,
> + DATA_TYPE_STRING = 0xffff,
> };
>
> typedef struct {
> @@ -778,6 +799,9 @@ static MTPData *usb_mtp_get_device_info(MTPState *s,
> MTPControl *c)
> CMD_GET_OBJECT_INFO,
> CMD_GET_OBJECT,
> CMD_GET_PARTIAL_OBJECT,
> + CMD_GET_OBJECT_PROPS_SUPPORTED,
> + CMD_GET_OBJECT_PROP_DESC,
> + CMD_GET_OBJECT_PROP_VALUE,
> };
> static const uint16_t fmt[] = {
> FMT_UNDEFINED_OBJECT,
> @@ -886,8 +910,7 @@ static MTPData *usb_mtp_get_object_info(MTPState *s,
> MTPControl *c,
>
> if (o->stat.st_size > 0xFFFFFFFF) {
> usb_mtp_add_u32(d, 0xFFFFFFFF);
> - }
> - else {
> + } else {
> usb_mtp_add_u32(d, o->stat.st_size);
> }
>
> @@ -972,6 +995,122 @@ static MTPData *usb_mtp_get_partial_object(MTPState *s,
> MTPControl *c,
> return d;
> }
>
> +static MTPData *usb_mtp_get_object_props_supported(MTPState *s, MTPControl
> *c)
> +{
> + static const uint16_t props[] = {
> + PROP_STORAGE_ID,
> + PROP_OBJECT_FORMAT,
> + PROP_OBJECT_COMPRESSED_SIZE,
> + PROP_PARENT_OBJECT,
> + PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER,
> + PROP_NAME,
> + };
> + MTPData *d = usb_mtp_data_alloc(c);
> + usb_mtp_add_u16_array(d, ARRAY_SIZE(props), props);
> +
> + return d;
> +}
> +
> +static MTPData *usb_mtp_get_object_prop_desc(MTPState *s, MTPControl *c)
> +{
> + MTPData *d = usb_mtp_data_alloc(c);
> + switch (c->argv[0]) {
> + case PROP_STORAGE_ID:
> + usb_mtp_add_u16(d, PROP_STORAGE_ID);
> + usb_mtp_add_u16(d, DATA_TYPE_UINT32);
> + usb_mtp_add_u8(d, 0x00);
> + usb_mtp_add_u32(d, 0x00000000);
> + usb_mtp_add_u32(d, 0x00000000);
> + usb_mtp_add_u8(d, 0x00);
> + break;
Stylistic:
Can rewrite all 0 valued calls to usb_mtp_add_u32(d, 0) and the like
but this is fine too :)
> + case PROP_OBJECT_FORMAT:
> + usb_mtp_add_u16(d, PROP_OBJECT_FORMAT);
> + usb_mtp_add_u16(d, DATA_TYPE_UINT16);
> + usb_mtp_add_u8(d, 0x00);
> + usb_mtp_add_u16(d, 0x0000);
> + usb_mtp_add_u32(d, 0x00000000);
> + usb_mtp_add_u8(d, 0x00);
> + break;
> + case PROP_OBJECT_COMPRESSED_SIZE:
> + usb_mtp_add_u16(d, PROP_OBJECT_COMPRESSED_SIZE);
> + usb_mtp_add_u16(d, DATA_TYPE_UINT64);
> + usb_mtp_add_u8(d, 0x00);
> + usb_mtp_add_u64(d, 0x0000000000000000);
> + usb_mtp_add_u32(d, 0x00000000);
> + usb_mtp_add_u8(d, 0x00);
> + break;
> + case PROP_PARENT_OBJECT:
> + usb_mtp_add_u16(d, PROP_PARENT_OBJECT);
> + usb_mtp_add_u16(d, DATA_TYPE_UINT32);
> + usb_mtp_add_u8(d, 0x00);
> + usb_mtp_add_u32(d, 0x00000000);
> + usb_mtp_add_u32(d, 0x00000000);
> + usb_mtp_add_u8(d, 0x00);
> + break;
> + case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
> + usb_mtp_add_u16(d, PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER);
> + usb_mtp_add_u16(d, DATA_TYPE_UINT128);
> + usb_mtp_add_u8(d, 0x00);
> + usb_mtp_add_u64(d, 0x0000000000000000);
> + usb_mtp_add_u64(d, 0x0000000000000000);
> + usb_mtp_add_u32(d, 0x00000000);
> + usb_mtp_add_u8(d, 0x00);
> + break;
> + case PROP_NAME:
> + usb_mtp_add_u16(d, PROP_NAME);
> + usb_mtp_add_u16(d, DATA_TYPE_STRING);
> + usb_mtp_add_u8(d, 0x00);
> + usb_mtp_add_u8(d, 0x00);
> + usb_mtp_add_u32(d, 0x00000000);
> + usb_mtp_add_u8(d, 0x00);
> + break;
> + default:
> + usb_mtp_data_free(d);
> + return NULL;
> + }
> +
> + return d;
> +}
> +
> +static MTPData *usb_mtp_get_object_prop_value(MTPState *s, MTPControl *c,
> + MTPObject *o)
> +{
> + MTPData *d = usb_mtp_data_alloc(c);
> + switch (c->argv[1]) {
> + case PROP_STORAGE_ID:
> + usb_mtp_add_u32(d, QEMU_STORAGE_ID);
> + break;
> + case PROP_OBJECT_FORMAT:
> + usb_mtp_add_u16(d, o->format);
> + break;
> + case PROP_OBJECT_COMPRESSED_SIZE:
> + usb_mtp_add_u64(d, o->stat.st_size);
> + break;
> + case PROP_PARENT_OBJECT:
> + if (o->parent == NULL) {
> + usb_mtp_add_u32(d, 0x00000000);
> + } else {
> + usb_mtp_add_u32(d, o->parent->handle);
> + }
> + break;
> + case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
> + /* Should be persistant between sessions,
> + * but using our objedt ID is "good enough"
s/objedt/object
> + * for now */
> + usb_mtp_add_u64(d, 0x0000000000000000);
> + usb_mtp_add_u64(d, o->handle);
I thought we decided on the inode number ? Probably harmless but can't be handle
be different across sessions ? For example, a new file is added followed by a
new
session.
Bandan
> + break;
> + case PROP_NAME:
> + usb_mtp_add_str(d, o->name);
> + break;
> + default:
> + usb_mtp_data_free(d);
> + return NULL;
> + }
> +
> + return d;
> +}
> +
> static void usb_mtp_command(MTPState *s, MTPControl *c)
> {
> MTPData *data_in = NULL;
> @@ -1119,6 +1258,43 @@ static void usb_mtp_command(MTPState *s, MTPControl *c)
> nres = 1;
> res0 = data_in->length;
> break;
> + case CMD_GET_OBJECT_PROPS_SUPPORTED:
> + if (c->argv[0] != FMT_UNDEFINED_OBJECT &&
> + c->argv[0] != FMT_ASSOCIATION) {
> + usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
> + c->trans, 0, 0, 0);
> + return;
> + }
> + data_in = usb_mtp_get_object_props_supported(s, c);
> + break;
> + case CMD_GET_OBJECT_PROP_DESC:
> + if (c->argv[1] != FMT_UNDEFINED_OBJECT &&
> + c->argv[1] != FMT_ASSOCIATION) {
> + usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
> + c->trans, 0, 0, 0);
> + return;
> + }
> + data_in = usb_mtp_get_object_prop_desc(s, c);
> + if (data_in == NULL) {
> + usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
> + c->trans, 0, 0, 0);
> + return;
> + }
> + break;
> + case CMD_GET_OBJECT_PROP_VALUE:
> + o = usb_mtp_object_lookup(s, c->argv[0]);
> + if (o == NULL) {
> + usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
> + c->trans, 0, 0, 0);
> + return;
> + }
> + data_in = usb_mtp_get_object_prop_value(s, c, o);
> + if (data_in == NULL) {
> + usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
> + c->trans, 0, 0, 0);
> + return;
> + }
> + break;
> default:
> trace_usb_mtp_op_unknown(s->dev.addr, c->code);
> usb_mtp_queue_result(s, RES_OPERATION_NOT_SUPPORTED,
> @@ -1204,9 +1380,9 @@ static void usb_mtp_handle_data(USBDevice *dev,
> USBPacket *p)
> trace_usb_mtp_data_in(s->dev.addr, d->trans, d->length);
> if (d->length + sizeof(container) > 0xFFFFFFFF) {
> container.length = cpu_to_le32(0xFFFFFFFF);
> - }
> - else {
> - container.length = cpu_to_le32(d->length +
> sizeof(container));
> + } else {
> + container.length = cpu_to_le32(d->length +
> + sizeof(container));
> }
> container.type = cpu_to_le16(TYPE_DATA);
> container.code = cpu_to_le16(d->code);