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sharperang
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hhhhhhfuck

This commit is contained in:
Maff 2019-08-28 00:39:15 +01:00
parent ead19b2175
commit 1687d16832
3 changed files with 82 additions and 20 deletions
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48
libsharperang/CRC32.cs Normal file
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@ -0,0 +1,48 @@
using System;
using System.Collections.Generic;
using System.Linq;
namespace libsharperang {
public class CRC32 {
public uint Initial { get; private set; } = 0xFFFFFFFF;
private uint Polynomial = 0xedb88320;
//private uint Polynomial = 0x04c11db7;
private uint[] Table;
public bool Initialised=false;
public CRC32(uint Initial) => this.Initial=Initial;
public CRC32() { }
public void Initialise() {
Table=Enumerable.Range(0, 256).Select(i => {
uint e=(uint)i;
for (ushort eb = 0; eb<8; ++eb) {
e=((e&1)!=0)
? (Polynomial^(e>>1))
: (e>>1);
}
return e;
}).ToArray();
Initialised=true;
}
public uint Reflect(uint iv) {
uint ivr=0;
for (int i = 0; i<32; i++) {
uint bit=(iv>>i)&1;
ivr |= (bit<<(31-i));
}
return ~ivr;
}
public uint GetChecksum<T>(IEnumerable<T> bytes) {
if (!Initialised) Initialise();
try {
return ~bytes.Aggregate(Initial,
(csR, cB) => Table[(csR & 0xFF) ^ Convert.ToByte(cB)] ^ (csR>>8));
} catch (FormatException e) {
throw new Exception("Could not read stream as bytes", e);
} catch (InvalidCastException e) {
throw new Exception("Could not read stream as bytes", e);
} catch (OverflowException e) {
throw new Exception("Could not read stream as bytes", e);
}
}
}
}

37
libsharperang/DataTransforms.cs
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@ -3,29 +3,40 @@ using Crc;
namespace libsharperang {
public class DataTransforms {
public class CrcSum : Crc32Base {
/*public class CrcSum : Crc32Base {
public uint CrcKey;
public CrcSum(uint Mangled, uint Key) : base(0x04c11db7, Mangled, 0xffffffff, true, true) => CrcKey=Key;
}
private uint Bludgeon(uint iv) {
uint ivr=0;
for (int i=0;i<32;i++) {
uint bit=(iv>>i)&1;
ivr |= (bit<<(31-i));
}
return ~ivr;
public CrcSum CRC;*/
public CRC32 hasher;
private uint MagicNumber=0x35769521;
//public bool IsCrcInitialised() => (CRC!=null);
public bool IsCrcInitialised() => (hasher!=null && hasher.Initialised);
//public void InitialiseCrc() => CRC=new CrcSum(Bludgeon(0x77c40d4d^0x35769521), 0x77c40d4d);
//public void InitialiseCrc(uint Key) => CRC=new CrcSum(Bludgeon(Key), Key);
public void InitialiseCrc(uint Key=0x35769521) {
if (hasher==null || (hasher.Initialised && hasher.Initial != Key)) hasher=new CRC32(Key);
hasher.Initialise();
}
public byte[] GetHashSum(byte[] data) {
if (!IsCrcInitialised()) InitialiseCrc();
//return CRC.ComputeHash(data);
return BitConverter.GetBytes(hasher.GetChecksum(data));
}
public CrcSum CRC;
public bool IsCrcInitialised() => (CRC!=null);
public void InitialiseCrc() => CRC=new CrcSum(Bludgeon(0x77c40d4d^0x35769521), 0x77c40d4d);
public void InitialiseCrc(uint Key) => CRC=new CrcSum(Bludgeon(Key), Key);
public uint GetCrcKey() {
if (!IsCrcInitialised()) InitialiseCrc();
return CRC.CrcKey;
//return CRC.CrcKey;
return (hasher.Initial == MagicNumber? hasher.Initial : hasher.Initial ^ MagicNumber);
}
public byte[] GetCrcKeyBytes() {
if (!IsCrcInitialised()) InitialiseCrc();
return BitConverter.GetBytes(GetCrcKey());
}
public uint SwapEndianness(uint value) => (
(value & 0x000000FFU) << 24) |
((value & 0x0000FF00U) << 8) |
((value & 0x00FF0000U) >> 8) |
((value & 0xFF000000U) >> 24);
}
}

17
libsharperang/usb.cs
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@ -62,6 +62,7 @@ using LibUsbDotNet.Main;
namespace libsharperang {
public class Frame {
public DataTransforms transformer=new DataTransforms();
public enum Opcode {
SessionBegin = 10,
SessionEnd,
@ -69,6 +70,8 @@ namespace libsharperang {
PrintContinue,
CrcTransmit = 30
}
private byte FrameStart = 0x02;
private byte FrameEnd = 0x03;
private byte[] ResolveOpcode(Opcode opcode) {
switch (opcode) {
case Opcode.SessionBegin: return new byte[] { 0x06, 0x00, 0x02, 0x00 };
@ -81,24 +84,24 @@ namespace libsharperang {
}
public byte[] Build(Opcode opcode, byte[] data) => Build(opcode, data, transformer);
public byte[] Build(Opcode opcode, byte[] data, DataTransforms transformer) {
if (!transformer.IsCrcInitialised()) transformer.InitialiseCrc();
byte[] result=new byte[data.Length+10];
result[0]=0x02;
result[result.Length-1]=0x03;
result[0]=FrameStart;
result[result.Length-1]=FrameEnd;
Buffer.BlockCopy(ResolveOpcode(opcode), 0, result, 1, 4);
Buffer.BlockCopy(data, 0, result, 5, data.Length);
Buffer.BlockCopy(transformer.CRC.ComputeHash(data), 0, result, result.Length-5, 4);
Buffer.BlockCopy(transformer.GetHashSum(data), 0, result, result.Length-5, 4);
return result;
}
public byte[] BuildTransmitCrc() {
if (!transformer.IsCrcInitialised()) transformer.InitialiseCrc(0x77c40d4d^0x35769521);
DataTransforms _=new DataTransforms();
_.InitialiseCrc(0x35769521);
_.InitialiseCrc();
return Build(Opcode.CrcTransmit, transformer.GetCrcKeyBytes(), _);
}
}
public class USBPrinter : Base, IPrinter {
// TODO - work out if it's possible to get this working with the default usbprint.inf driver Windows uses on plugging in
// otherwise any user would have to first use Zadig to change the driver to WinUSB
// TODO - work out if it's possible to get this working with the default usbprint.inf driver Windows uses on plugging in
// otherwise any user would have to first use Zadig to change the driver to WinUSB
private UsbDevice _uDv;
private UsbEndpointWriter _uWr;
private UsbEndpointReader _uRd;