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[VIDEOPRT]

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Fix buggy monitor device id decode routine.
This patch is dedicated to Christoph von Wittlich.

svn path=/trunk/; revision=63224
This commit is contained in:
Eric Kohl 2014-05-10 21:15:36 +00:00
parent 8ce24812f8
commit 94f60baa09
1 changed files with 9 additions and 14 deletions
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23
reactos/win32ss/drivers/videoprt/child.c
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@ -20,6 +20,7 @@
*/
#include "videoprt.h"
#include <stdio.h>
#define NDEBUG
#include <debug.h>
@ -33,30 +34,24 @@ IntVideoPortGetMonitorId(
IN OUT PWCHAR Buffer)
{
USHORT Manufacturer, Model;
UNICODE_STRING UnicodeModelStr;
/* This must be valid to call this function */
ASSERT(ChildExtension->EdidValid);
/* 3 letters 5-bit ANSI manufacturer code (big endian) */
Manufacturer = *(PUSHORT)(&ChildExtension->ChildDescriptor[8]);
/* Letters encoded as A=1 to Z=26 */
Buffer[0] = (WCHAR)((Manufacturer & 0x7C00) + 'A' - 1);
Buffer[1] = (WCHAR)((Manufacturer & 0x03E0) + 'A' - 1);
Buffer[2] = (WCHAR)((Manufacturer & 0x001F) + 'A' - 1);
Manufacturer = *(PUSHORT)(&ChildExtension->ChildDescriptor[8]);
/* Model number (16-bit little endian) */
Model = *(PUSHORT)(&ChildExtension->ChildDescriptor[10]);
/* Use Rtl helper for conversion */
UnicodeModelStr.Buffer = &Buffer[3];
UnicodeModelStr.Length = 0;
UnicodeModelStr.MaximumLength = 4 * sizeof(WCHAR);
RtlIntegerToUnicodeString(Model, 16, &UnicodeModelStr);
/* Terminate it */
Buffer[7] = UNICODE_NULL;
/* Convert the Monitor ID to a readable form */
swprintf(Buffer,
L"%C%C%C%04hx",
(WCHAR)((Manufacturer >> 10 & 0x001F) + 'A' - 1),
(WCHAR)((Manufacturer >> 5 & 0x001F) + 'A' - 1),
(WCHAR)((Manufacturer & 0x001F) + 'A' - 1),
Model);
/* And we're done */
return TRUE;