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comparison USBLib/Descriptor/UsbDescriptor.cs @ 47:15ddb1e0e2a5

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USBLib: added convenience functions to retrieve descriptors from devices
author Ivo Smits <Ivo@UCIS.nl>
date Tue, 16 Jul 2013 13:16:04 +0200
parents 5b14fed54a89
children fd63c453ff65
comparison
equal deleted inserted replaced
46:053cc617af54 47:15ddb1e0e2a5
27 if (offset < 0 || length < 0 || offset + length > buffer.Length) throw new ArgumentOutOfRangeException("length", "The specified offset and length exceed the buffer dimensions"); 27 if (offset < 0 || length < 0 || offset + length > buffer.Length) throw new ArgumentOutOfRangeException("length", "The specified offset and length exceed the buffer dimensions");
28 if (buffer[offset + 1] != (Byte)UsbDescriptorType.String) throw new InvalidOperationException("The descriptor is not a string descriptor"); 28 if (buffer[offset + 1] != (Byte)UsbDescriptorType.String) throw new InvalidOperationException("The descriptor is not a string descriptor");
29 int slen = buffer[offset]; 29 int slen = buffer[offset];
30 if (slen > length) throw new InvalidOperationException("The string has been truncated"); 30 if (slen > length) throw new InvalidOperationException("The string has been truncated");
31 return Encoding.Unicode.GetString(buffer, offset + 2, slen - 2); 31 return Encoding.Unicode.GetString(buffer, offset + 2, slen - 2);
32 }
33 public static String GetStringFromDevice(IUsbInterface device, byte index, short langId) {
34 Byte[] buff = new Byte[256];
35 int len = device.GetDescriptor((Byte)UsbDescriptorType.String, index, langId, buff, 0, buff.Length);
36 return GetString(buff, 0, len);
32 } 37 }
33 } 38 }
34 [StructLayout(LayoutKind.Sequential, Pack = 1)] 39 [StructLayout(LayoutKind.Sequential, Pack = 1)]
35 public struct UsbDeviceDescriptor { 40 public struct UsbDeviceDescriptor {
36 byte bmLength; 41 byte bmLength;
64 public unsafe static UsbDeviceDescriptor FromByteArray(Byte[] buffer, int offset, int length) { 69 public unsafe static UsbDeviceDescriptor FromByteArray(Byte[] buffer, int offset, int length) {
65 if (length < Size) throw new ArgumentOutOfRangeException("length", "The data length is smaller than the descriptor length"); 70 if (length < Size) throw new ArgumentOutOfRangeException("length", "The data length is smaller than the descriptor length");
66 if (offset < 0 || length < 0 || offset + length > buffer.Length) throw new ArgumentOutOfRangeException("length", "The specified offset and length exceed the buffer dimensions"); 71 if (offset < 0 || length < 0 || offset + length > buffer.Length) throw new ArgumentOutOfRangeException("length", "The specified offset and length exceed the buffer dimensions");
67 fixed (Byte* ptr = buffer) return *(UsbDeviceDescriptor*)(ptr + offset); 72 fixed (Byte* ptr = buffer) return *(UsbDeviceDescriptor*)(ptr + offset);
68 } 73 }
74 public static UsbDeviceDescriptor FromDevice(IUsbInterface device) {
75 Byte[] buff = new Byte[UsbDeviceDescriptor.Size];
76 int len = device.GetDescriptor((Byte)UsbDescriptorType.Device, 0, 0, buff, 0, buff.Length);
77 return FromByteArray(buff, 0, len);
78 }
69 public static unsafe int Size { get { return sizeof(UsbDeviceDescriptor); } } 79 public static unsafe int Size { get { return sizeof(UsbDeviceDescriptor); } }
70 } 80 }
71 [StructLayout(LayoutKind.Sequential, Pack = 1)] 81 [StructLayout(LayoutKind.Sequential, Pack = 1)]
72 public struct UsbConfigurationDescriptor { 82 public struct UsbConfigurationDescriptor {
73 byte bmLength; 83 byte bmLength;