Hi,
Here is a Length Disassembler Engine for Windows x64. You can evaluate length instruction for both
32 bits and 64 bits targets :

To disasm instruction from 64 bits architecture :

mov edx, 64
mov rcx, Address2Disasm
call LDE
return -> rax == Instruction Size

To disasm instruction from 32 bits architecture :

mov edx, 0
mov rcx, Address2Disasm
call LDE
return -> rax == Instruction Size

Remarks:
1 - LDE64-x64 is quite fast
2 - LDE64-x64 is relocatable
3 - LDE64-x64 uses _fastcall convention.
3 - It is not a "small" LDE. Sorry for its size (12000 bytes).
4 - You can analyze all standard instructions, MMX, FPU, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, VMX.

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