From: Aric Stewart <aric@codeweavers.com>
Subject: [13/14]hid: Implement HidP_MaxUsageListLength
Message-Id: <558C1B4C.7050100@codeweavers.com>
Date: Thu, 25 Jun 2015 10:16:28 -0500

---
 dlls/hid/hid.spec   |  2 +-
 dlls/hid/hidp.c     | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/ddk/hidpi.h |  2 +-
 3 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/dlls/hid/hid.spec b/dlls/hid/hid.spec
index 2dad3c7..8772a35 100644
--- a/dlls/hid/hid.spec
+++ b/dlls/hid/hid.spec
@@ -33,7 +33,7 @@
 @ stdcall HidP_GetValueCaps(long ptr ptr ptr)
 @ stdcall HidP_InitializeReportForID(long long ptr ptr long)
 @ stub HidP_MaxDataListLength
-@ stub HidP_MaxUsageListLength
+@ stdcall HidP_MaxUsageListLength(long long ptr)
 @ stub HidP_SetData
 @ stub HidP_SetScaledUsageValue
 @ stub HidP_SetUsageValue
diff --git a/dlls/hid/hidp.c b/dlls/hid/hidp.c
index 4bf63e7..7adc3e5 100644
--- a/dlls/hid/hidp.c
+++ b/dlls/hid/hidp.c
@@ -411,3 +411,56 @@ NTSTATUS WINAPI HidP_InitializeReportForID(HIDP_REPORT_TYPE ReportType, UCHAR Re
 
     return HIDP_STATUS_SUCCESS;
 }
+
+ULONG WINAPI HidP_MaxUsageListLength(HIDP_REPORT_TYPE ReportType, USAGE UsagePage, PHIDP_PREPARSED_DATA PreparsedData)
+{
+    PWINE_HIDP_PREPARSED_DATA data = (PWINE_HIDP_PREPARSED_DATA)PreparsedData;
+    WINE_HID_REPORT *report = NULL;
+    int r_count;
+    int i;
+    int count = 0;
+
+    TRACE("(%i, %x, %p)\n", ReportType, UsagePage, PreparsedData);
+
+    if (data->magic != HID_MAGIC)
+        return 0;
+
+    switch(ReportType)
+    {
+        case HidP_Input:
+            report = HID_INPUT_REPORTS(data);
+            r_count = data->dwInputReportCount;
+            break;
+        case HidP_Output:
+            report = HID_OUTPUT_REPORTS(data);
+            r_count = data->dwOutputReportCount;
+            break;
+        case HidP_Feature:
+            report = HID_FEATURE_REPORTS(data);
+            r_count = data->dwFeatureReportCount;
+            break;
+        default:
+            return HIDP_STATUS_INVALID_REPORT_TYPE;
+    }
+
+    if (!r_count || !report)
+        return 0;
+
+    for (i = 0; i < r_count; i++)
+    {
+        int j;
+        for (j = 0; j < report->elementCount; j++)
+        {
+            if (report->Elements[j].caps.button.UsagePage == UsagePage)
+            {
+                if (report->Elements[j].caps.button.IsRange)
+                    count += (report->Elements[j].caps.button.Range.UsageMax -
+                             report->Elements[j].caps.button.Range.UsageMin) + 1;
+                else
+                    count++;
+            }
+        }
+        report = HID_NEXT_REPORT(data, report);
+    }
+    return count;
+}
diff --git a/include/ddk/hidpi.h b/include/ddk/hidpi.h
index e31aebb..4210820 100644
--- a/include/ddk/hidpi.h
+++ b/include/ddk/hidpi.h
@@ -142,7 +142,7 @@ NTSTATUS WINAPI HidP_GetUsages(HIDP_REPORT_TYPE ReportType, USAGE UsagePage, USH
 NTSTATUS WINAPI HidP_GetUsageValue(HIDP_REPORT_TYPE ReportType, USAGE UsagePage, USHORT LinkCollection, USAGE Usage, PULONG UsageValue, PHIDP_PREPARSED_DATA PreparsedData, PCHAR Report, ULONG ReportLength);
 NTSTATUS WINAPI HidP_GetValueCaps(HIDP_REPORT_TYPE ReportType, PHIDP_VALUE_CAPS ValueCaps, PUSHORT ValueCapsLength, PHIDP_PREPARSED_DATA PreparsedData);
 NTSTATUS WINAPI HidP_InitializeReportForID(HIDP_REPORT_TYPE ReportType, UCHAR ReportID, PHIDP_PREPARSED_DATA PreparsedData, PCHAR Report, ULONG ReportLength);
-
+ULONG WINAPI HidP_MaxUsageListLength(HIDP_REPORT_TYPE ReportType, USAGE UsagePage, PHIDP_PREPARSED_DATA PreparsedData);
 
 #ifndef FACILITY_HID_ERROR_CODE
 #define FACILITY_HID_ERROR_CODE 0x11