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usb/microsoft: Implemented support for sending the feature descriptors

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dragonmux
2022-08-12 09:27:18 +01:00
committed by Piotr Esden-Tempski
parent c5e47af5da
commit f2db2a1c61
1 changed files with 56 additions and 0 deletions
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56
lib/usb/usb_microsoft.c
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@@ -22,12 +22,68 @@
#include <libopencm3/usb/microsoft.h>
#include "usb_private.h"
#define MICROSOFT_OS_FEATURE_REGISTRY_PROPERTY_DESCRIPTOR_SIZE_CHUNK1 8U
#define MICROSOFT_OS_FEATURE_REGISTRY_PROPERTY_DESCRIPTOR_SIZE_CHUNK2 2U
static uint16_t build_function_subset(const microsoft_os_descriptor_function_subset_header *const subset,
uint8_t *const buf, uint16_t len)
{
uint16_t count = MIN(len, subset->wLength);
memcpy(buf, subset, count);
uint16_t total = count;
uint16_t total_length = subset->wLength;
size_t offset = 0;
for (uint8_t i = 0; i < subset->num_feature_descriptors; ++i) {
const microsoft_os_feature_descriptor *const feature =
(const microsoft_os_feature_descriptor *)(((const uint8_t *)subset->feature_descriptors) + offset);
switch (feature->wDescriptorType) {
case MICROSOFT_OS_FEATURE_COMPATIBLE_ID:
case MICROSOFT_OS_FEATURE_MIN_RESUME_TIME:
case MICROSOFT_OS_FEATURE_MODEL_ID:
case MICROSOFT_OS_FEATURE_CCGP_DEVICE:
case MICROSOFT_OS_FEATURE_VENDOR_REVISION:
count = MIN(len, feature->wLength);
memcpy(buf + total, feature, count);
total_length += feature->wLength;
offset += feature->wLength;
break;
case MICROSOFT_OS_FEATURE_REG_PROPERTY: {
const microsoft_os_feature_registry_property_descriptor *const registry_property =
(const microsoft_os_feature_registry_property_descriptor *)feature;
uint16_t *descriptor_length = (uint16_t *)(buf + total);
/* Copy in the first chunk of the descriptor */
count = MIN(len, MICROSOFT_OS_FEATURE_REGISTRY_PROPERTY_DESCRIPTOR_SIZE_CHUNK1);
memcpy(buf + total, registry_property, count);
len -= count;
total += count;
/* Copy in the property name */
count = MIN(len, registry_property->wPropertyNameLength);
memcpy(buf + total, registry_property->PropertyName, count);
len -= count;
total += count;
/* Copy in the second chunk of the descriptor */
count = MIN(len, MICROSOFT_OS_FEATURE_REGISTRY_PROPERTY_DESCRIPTOR_SIZE_CHUNK2);
memcpy(buf + total, &registry_property->wPropertyDataLength, count);
len -= count;
total += count;
/* Copy in the property data */
count = MIN(len, registry_property->wPropertyDataLength);
memcpy(buf + total, registry_property->PropertyData, count);
/* Compute the total length of this descriptor and update total_length + offset */
*descriptor_length = MICROSOFT_OS_FEATURE_REGISTRY_PROPERTY_DESCRIPTOR_SIZE_BASE +
registry_property->wPropertyNameLength + registry_property->wPropertyDataLength;
total_length += *descriptor_length;
offset += sizeof(microsoft_os_feature_registry_property_descriptor);
break;
}
default:
return 0;
}
len -= count;
total += count;
}
((microsoft_os_descriptor_function_subset_header *)buf)->wTotalLength = total_length;
return total_length;