Ensure that the cbStruct member of the ACMDRIVERDETAILS[AW] struct is
filled with a valid value before returning.
Fill the cbStruct member of the ACMDRIVERDETAILS[AW] before sending a
ACMDM_DRIVER_DETAILS message to an installed codec that might be a
native library: native ACM codecs expect cbStruct to be valid before
filling the rest of the struct with any data.

Improved bounds checking.

(reported by Vitaliy Margolen).

Makes for a significantly better user experience for CJK users.

Various internal cleanups.

The handler does the opposite of normal page fault handlers.

make it pass under Wine.

Increase maximum length of commands to 8192 bytes as on Windows XP.
Add needed braces to a multi line "if" statement.

Changed exception raise functions to call it explicitly.

With a conformance test.

New implementation of relay thunks that doesn't require modifying code
on the fly, so that the thunks can be put in the text section.
Some performance improvements.

A no-access page is enough, we can't properly raise an overflow
exception anyway.