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@@ -0,0 +1,616 @@
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+/*
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+ Simple DirectMedia Layer
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+ Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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+
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+ This software is provided 'as-is', without any express or implied
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+ warranty. In no event will the authors be held liable for any damages
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+ arising from the use of this software.
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+
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+ Permission is granted to anyone to use this software for any purpose,
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+ including commercial applications, and to alter it and redistribute it
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+ freely, subject to the following restrictions:
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+
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+ 1. The origin of this software must not be misrepresented; you must not
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+ claim that you wrote the original software. If you use this software
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+ in a product, an acknowledgment in the product documentation would be
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+ appreciated but is not required.
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+ 2. Altered source versions must be plainly marked as such, and must not be
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+ misrepresented as being the original software.
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+ 3. This notice may not be removed or altered from any source distribution.
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+*/
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+#include "SDL_internal.h"
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+
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+#include "SDL_report_descriptor.h"
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+
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+// This is a very simple (and non-compliant!) report descriptor parser
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+// used to quickly parse Xbox Bluetooth reports
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+
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+typedef enum
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+{
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+ DescriptorItemTypeMain = 0,
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+ DescriptorItemTypeGlobal = 1,
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+ DescriptorItemTypeLocal = 2,
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+ DescriptorItemTypeReserved = 3,
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+} ItemType;
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+
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+typedef enum
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+{
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+ MainTagInput = 0x8,
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+ MainTagOutput = 0x9,
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+ MainTagFeature = 0xb,
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+ MainTagCollection = 0xa,
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+ MainTagEndCollection = 0xc,
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+} MainTag;
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+
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+typedef enum
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+{
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+ MainFlagConstant = 0x0001,
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+ MainFlagVariable = 0x0002,
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+ MainFlagRelative = 0x0004,
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+ MainFlagWrap = 0x0008,
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+ MainFlagNonLinear = 0x0010,
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+ MainFlagNoPreferred = 0x0020,
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+ MainFlagNullState = 0x0040,
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+ MainFlagVolatile = 0x0080,
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+ MainFlagBufferedBytes = 0x0100,
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+} MainFlag;
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+
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+typedef enum
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+{
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+ GlobalTagUsagePage = 0x0,
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+ GlobalTagLogicalMinimum = 0x1,
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+ GlobalTagLogicalMaximum = 0x2,
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+ GlobalTagPhysicalMinimum = 0x3,
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+ GlobalTagPhysicalMaximum = 0x4,
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+ GlobalTagUnitExponent = 0x5,
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+ GlobalTagUnit = 0x6,
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+ GlobalTagReportSize = 0x7,
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+ GlobalTagReportID = 0x8,
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+ GlobalTagReportCount = 0x9,
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+ GlobalTagPush = 0xa,
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+ GlobalTagPop = 0xb,
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+} GlobalTag;
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+
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+typedef enum
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+{
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+ LocalTagUsage = 0x0,
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+ LocalTagUsageMinimum = 0x1,
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+ LocalTagUsageMaximum = 0x2,
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+ LocalTagDesignatorIndex = 0x3,
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+ LocalTagDesignatorMinimum = 0x4,
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+ LocalTagDesignatorMaximum = 0x5,
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+ LocalTagStringIndex = 0x7,
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+ LocalTagStringMinimum = 0x8,
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+ LocalTagStringMaximum = 0x9,
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+ LocalTagDelimiter = 0xa,
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+} LocalTag;
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+
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+typedef struct
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+{
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+ unsigned int usage_page;
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+ unsigned int report_size;
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+ unsigned int report_count;
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+ unsigned int report_id;
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+} DescriptorGlobalState;
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+
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+typedef struct
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+{
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+ unsigned int usage_minimum;
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+ unsigned int usage_maximum;
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+ int usage_maxcount;
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+ int usage_count;
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+ Uint32 *usages;
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+} DescriptorLocalState;
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+
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+typedef struct
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+{
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+ int collection_depth;
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+ DescriptorGlobalState global;
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+ DescriptorLocalState local;
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+ int field_maxcount;
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+ int field_count;
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+ int field_offset;
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+ DescriptorInputField *fields;
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+} DescriptorContext;
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+
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+static void DebugDescriptor(DescriptorContext *ctx, const char *fmt, ...)
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+{
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+#ifdef DEBUG_DESCRIPTOR
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+ va_list ap;
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+ va_start(ap, fmt);
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+ char *message = NULL;
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+ SDL_vasprintf(&message, fmt, ap);
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+ va_end(ap);
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+ if (ctx->collection_depth > 0) {
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+ size_t len = 4 * ctx->collection_depth + SDL_strlen(message) + 1;
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+ char *output = (char *)SDL_malloc(len);
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+ if (output) {
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+ SDL_memset(output, ' ', 4 * ctx->collection_depth);
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+ output[4 * ctx->collection_depth] = '\0';
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+ SDL_strlcat(output, message, len);
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+ SDL_free(message);
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+ message = output;
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+ }
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+ }
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+ SDL_Log("%s", message);
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+ SDL_free(message);
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+#endif // DEBUG_DESCRIPTOR
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+}
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+
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+static void DebugMainTag(DescriptorContext *ctx, const char *tag, unsigned int flags)
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+{
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+#ifdef DEBUG_DESCRIPTOR
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+ char message[1024] = { 0 };
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+
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+ SDL_strlcat(message, tag, sizeof(message));
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+ SDL_strlcat(message, "(", sizeof(message));
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+ if (flags & MainFlagConstant) {
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+ SDL_strlcat(message, " Constant", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " Data", sizeof(message));
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+ }
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+ if (flags & MainFlagVariable) {
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+ SDL_strlcat(message, " Variable", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " Array", sizeof(message));
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+ }
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+ if (flags & MainFlagRelative) {
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+ SDL_strlcat(message, " Relative", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " Absolute", sizeof(message));
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+ }
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+ if (flags & MainFlagWrap) {
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+ SDL_strlcat(message, " Wrap", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " No Wrap", sizeof(message));
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+ }
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+ if (flags & MainFlagNonLinear) {
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+ SDL_strlcat(message, " Non Linear", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " Linear", sizeof(message));
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+ }
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+ if (flags & MainFlagNoPreferred) {
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+ SDL_strlcat(message, " No Preferred", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " Preferred State", sizeof(message));
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+ }
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+ if (flags & MainFlagNullState) {
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+ SDL_strlcat(message, " Null State", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " No Null Position", sizeof(message));
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+ }
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+ if (flags & MainFlagVolatile) {
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+ SDL_strlcat(message, " Volatile", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " Non Volatile", sizeof(message));
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+ }
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+ if (flags & MainFlagBufferedBytes) {
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+ SDL_strlcat(message, " Buffered Bytes", sizeof(message));
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+ } else {
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+ SDL_strlcat(message, " Bit Field", sizeof(message));
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+ }
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+ SDL_strlcat(message, " )", sizeof(message));
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+
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+ DebugDescriptor(ctx, "%s", message);
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+
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+#endif // DEBUG_DESCRIPTOR
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+}
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+
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+static unsigned int ReadValue(const Uint8 *data, int size)
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+{
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+ unsigned int value = 0;
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+
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+ int shift = 0;
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+ while (size--) {
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+ value |= ((unsigned int)*data++) << shift;
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+ shift += 8;
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+ }
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+ return value;
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+}
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+
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+static void ResetLocalState(DescriptorContext *ctx)
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+{
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+ ctx->local.usage_minimum = 0;
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+ ctx->local.usage_maximum = 0;
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+ ctx->local.usage_count = 0;
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+}
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+
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+static bool AddUsage(DescriptorContext *ctx, unsigned int usage)
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+{
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+ if (ctx->local.usage_count == ctx->local.usage_maxcount) {
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+ int usage_maxcount = ctx->local.usage_maxcount + 4;
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+ Uint32 *usages = (Uint32 *)SDL_realloc(ctx->local.usages, usage_maxcount * sizeof(*usages));
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+ if (!usages) {
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+ return false;
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+ }
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+ ctx->local.usages = usages;
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+ ctx->local.usage_maxcount = usage_maxcount;
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+ }
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+
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+ if (usage <= 0xFFFF) {
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+ usage |= (ctx->global.usage_page << 16);
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+ }
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+ ctx->local.usages[ctx->local.usage_count++] = usage;
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+ return true;
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+}
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+
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+static bool AddInputField(DescriptorContext *ctx, unsigned int usage, int bit_size)
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+{
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+ if (ctx->field_count == ctx->field_maxcount) {
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+ int field_maxcount = ctx->field_maxcount + 4;
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+ DescriptorInputField *fields = (DescriptorInputField *)SDL_realloc(ctx->fields, field_maxcount * sizeof(*fields));
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+ if (!fields) {
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+ return false;
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+ }
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+ ctx->fields = fields;
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+ ctx->field_maxcount = field_maxcount;
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+ }
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+
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+ DescriptorInputField *field = &ctx->fields[ctx->field_count++];
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+ field->report_id = (Uint8)ctx->global.report_id;
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+ field->usage = usage;
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+ field->bit_offset = ctx->field_offset;
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+ field->bit_size = bit_size;
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+
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+ DebugDescriptor(ctx, "Adding report %d field 0x%.8x size %d bits at bit offset %d", field->report_id, field->usage, field->bit_size, field->bit_offset);
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+ return true;
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+}
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+
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+static bool AddInputFields(DescriptorContext *ctx)
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+{
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+ unsigned int usage = 0;
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+
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+ if (ctx->global.report_count == 0 || ctx->global.report_size == 0) {
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+ return true;
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+ }
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+
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+ if (ctx->local.usage_count == 0 &&
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+ ctx->local.usage_minimum > 0 &&
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+ ctx->local.usage_maximum >= ctx->local.usage_minimum) {
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+ for (usage = ctx->local.usage_minimum; usage <= ctx->local.usage_maximum; ++usage) {
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+ if (!AddUsage(ctx, usage)) {
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+ return false;
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+ }
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+ }
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+ }
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+
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+ int usage_index = 0;
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+ for (unsigned int i = 0; i < ctx->global.report_count; ++i) {
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+ if (usage_index < ctx->local.usage_count) {
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+ usage = ctx->local.usages[usage_index];
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+ if (usage_index < (ctx->local.usage_count - 1)) {
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+ ++usage_index;
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+ }
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+ }
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+
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+ int size = (int)ctx->global.report_size;
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+ if (usage > 0) {
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+ if (!AddInputField(ctx, usage, size)) {
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+ return false;
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+ }
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+ }
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+ ctx->field_offset += size;
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+ }
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+ return true;
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+}
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+
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+static bool ParseMainItem(DescriptorContext *ctx, int tag, int size, const Uint8 *data)
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+{
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+ unsigned int flags;
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+
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+ switch (tag) {
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+ case MainTagInput:
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+ flags = ReadValue(data, size);
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+ DebugMainTag(ctx, "MainTagInput", flags);
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+ AddInputFields(ctx);
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+ break;
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+ case MainTagOutput:
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+ flags = ReadValue(data, size);
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+ DebugMainTag(ctx, "MainTagOutput", flags);
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+ break;
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+ case MainTagFeature:
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+ flags = ReadValue(data, size);
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+ DebugMainTag(ctx, "MainTagFeature", flags);
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+ break;
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+ case MainTagCollection:
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+ DebugDescriptor(ctx, "MainTagCollection");
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+ switch (*data) {
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+ case 0x00:
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+ DebugDescriptor(ctx, "Physical");
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+ break;
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+ case 0x01:
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+ DebugDescriptor(ctx, "Application");
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+ break;
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+ case 0x02:
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+ DebugDescriptor(ctx, "Logical");
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+ break;
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+ case 0x03:
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+ DebugDescriptor(ctx, "Report");
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+ break;
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+ case 0x04:
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+ DebugDescriptor(ctx, "Named Array");
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+ break;
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+ case 0x05:
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+ DebugDescriptor(ctx, "Usage Switch");
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+ break;
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+ case 0x06:
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+ DebugDescriptor(ctx, "Usage Modifier");
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+ break;
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+ default:
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+ break;
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+ }
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+ ++ctx->collection_depth;
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+ break;
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+ case MainTagEndCollection:
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+ if (ctx->collection_depth > 0) {
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+ --ctx->collection_depth;
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+ }
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+ DebugDescriptor(ctx, "MainTagEndCollection");
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+ break;
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+ default:
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+ DebugDescriptor(ctx, "Unknown main tag: %d", tag);
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+ break;
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+ }
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+
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+ ResetLocalState(ctx);
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+
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+ return true;
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+}
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+
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+static bool ParseGlobalItem(DescriptorContext *ctx, int tag, int size, const Uint8 *data)
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+{
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+ unsigned int value;
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+
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+ switch (tag) {
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+ case GlobalTagUsagePage:
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+ ctx->global.usage_page = ReadValue(data, size);
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+ DebugDescriptor(ctx, "GlobalTagUsagePage: 0x%.4x", ctx->global.usage_page);
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+ break;
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+ case GlobalTagLogicalMinimum:
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+ value = ReadValue(data, size);
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+ DebugDescriptor(ctx, "GlobalTagLogicalMinimum: %u", value);
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+ break;
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+ case GlobalTagLogicalMaximum:
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+ value = ReadValue(data, size);
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+ DebugDescriptor(ctx, "GlobalTagLogicalMaximum: %u", value);
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+ break;
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+ case GlobalTagPhysicalMinimum:
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+ value = ReadValue(data, size);
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+ DebugDescriptor(ctx, "GlobalTagPhysicalMinimum: %u", value);
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+ break;
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+ case GlobalTagPhysicalMaximum:
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+ value = ReadValue(data, size);
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+ DebugDescriptor(ctx, "GlobalTagPhysicalMaximum: %u", value);
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+ break;
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+ case GlobalTagUnitExponent:
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+ DebugDescriptor(ctx, "GlobalTagUnitExponent");
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+ break;
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+ case GlobalTagUnit:
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+ DebugDescriptor(ctx, "GlobalTagUnit");
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+ break;
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+ case GlobalTagReportSize:
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+ ctx->global.report_size = ReadValue(data, size);
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+ DebugDescriptor(ctx, "GlobalTagReportSize: %u", ctx->global.report_size);
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+ break;
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+ case GlobalTagReportID:
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+ ctx->global.report_id = ReadValue(data, size);
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+ ctx->field_offset = 0;
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+ DebugDescriptor(ctx, "GlobalTagReportID: %u", ctx->global.report_id);
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+ break;
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+ case GlobalTagReportCount:
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+ ctx->global.report_count = ReadValue(data, size);
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+ DebugDescriptor(ctx, "GlobalTagReportCount: %u", ctx->global.report_count);
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+ break;
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+ case GlobalTagPush:
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+ DebugDescriptor(ctx, "GlobalTagPush");
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+ break;
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+ case GlobalTagPop:
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+ DebugDescriptor(ctx, "GlobalTagPop");
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+ break;
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+ default:
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+ DebugDescriptor(ctx, "Unknown global tag");
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+ break;
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+ }
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+ return true;
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+}
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+
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+static bool ParseLocalItem(DescriptorContext *ctx, int tag, int size, const Uint8 *data)
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+{
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+ unsigned int value;
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+
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+ switch (tag) {
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+ case LocalTagUsage:
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+ value = ReadValue(data, size);
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+ AddUsage(ctx, value);
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+ DebugDescriptor(ctx, "LocalTagUsage: 0x%.4x", value);
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+ break;
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+ case LocalTagUsageMinimum:
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|
|
+ ctx->local.usage_minimum = ReadValue(data, size);
|
|
|
+ DebugDescriptor(ctx, "LocalTagUsageMinimum: 0x%.4x", ctx->local.usage_minimum);
|
|
|
+ break;
|
|
|
+ case LocalTagUsageMaximum:
|
|
|
+ ctx->local.usage_maximum = ReadValue(data, size);
|
|
|
+ DebugDescriptor(ctx, "LocalTagUsageMaximum: 0x%.4x", ctx->local.usage_maximum);
|
|
|
+ break;
|
|
|
+ case LocalTagDesignatorIndex:
|
|
|
+ DebugDescriptor(ctx, "LocalTagDesignatorIndex");
|
|
|
+ break;
|
|
|
+ case LocalTagDesignatorMinimum:
|
|
|
+ DebugDescriptor(ctx, "LocalTagDesignatorMinimum");
|
|
|
+ break;
|
|
|
+ case LocalTagDesignatorMaximum:
|
|
|
+ DebugDescriptor(ctx, "LocalTagDesignatorMaximum");
|
|
|
+ break;
|
|
|
+ case LocalTagStringIndex:
|
|
|
+ DebugDescriptor(ctx, "LocalTagStringIndex");
|
|
|
+ break;
|
|
|
+ case LocalTagStringMinimum:
|
|
|
+ DebugDescriptor(ctx, "LocalTagStringMinimum");
|
|
|
+ break;
|
|
|
+ case LocalTagStringMaximum:
|
|
|
+ DebugDescriptor(ctx, "LocalTagStringMaximum");
|
|
|
+ break;
|
|
|
+ case LocalTagDelimiter:
|
|
|
+ DebugDescriptor(ctx, "LocalTagDelimiter");
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ DebugDescriptor(ctx, "Unknown local tag");
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return true;
|
|
|
+}
|
|
|
+
|
|
|
+bool ParseDescriptor(DescriptorContext *ctx, const Uint8 *descriptor, int descriptor_size)
|
|
|
+{
|
|
|
+ SDL_zerop(ctx);
|
|
|
+
|
|
|
+ for (const Uint8 *here = descriptor; here < descriptor + descriptor_size; ) {
|
|
|
+ static const int sizes[4] = { 0, 1, 2, 4 };
|
|
|
+ Uint8 data = *here++;
|
|
|
+ int size = sizes[(data & 0x3)];
|
|
|
+ int type = ((data >> 2) & 0x3);
|
|
|
+ int tag = (data >> 4);
|
|
|
+
|
|
|
+ if ((here + size) > (descriptor + descriptor_size)) {
|
|
|
+ return SDL_SetError("Invalid descriptor");
|
|
|
+ }
|
|
|
+
|
|
|
+#ifdef DEBUG_DESCRIPTOR
|
|
|
+ SDL_Log("Data: 0x%.2x, size: %d, type: %d, tag: %d", data, size, type, tag);
|
|
|
+#endif
|
|
|
+ switch (type) {
|
|
|
+ case DescriptorItemTypeMain:
|
|
|
+ if (!ParseMainItem(ctx, tag, size, here)) {
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case DescriptorItemTypeGlobal:
|
|
|
+ if (!ParseGlobalItem(ctx, tag, size, here)) {
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case DescriptorItemTypeLocal:
|
|
|
+ if (!ParseLocalItem(ctx, tag, size, here)) {
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case DescriptorItemTypeReserved:
|
|
|
+ // Long items are currently unsupported
|
|
|
+ return SDL_Unsupported();
|
|
|
+ }
|
|
|
+
|
|
|
+ here += size;
|
|
|
+ }
|
|
|
+ return true;
|
|
|
+}
|
|
|
+
|
|
|
+static void CleanupContext(DescriptorContext *ctx)
|
|
|
+{
|
|
|
+ SDL_free(ctx->local.usages);
|
|
|
+ SDL_free(ctx->fields);
|
|
|
+}
|
|
|
+
|
|
|
+SDL_ReportDescriptor *SDL_ParseReportDescriptor(const Uint8 *descriptor, int descriptor_size)
|
|
|
+{
|
|
|
+ SDL_ReportDescriptor *result = NULL;
|
|
|
+
|
|
|
+ DescriptorContext ctx;
|
|
|
+ if (ParseDescriptor(&ctx, descriptor, descriptor_size)) {
|
|
|
+ result = (SDL_ReportDescriptor *)SDL_malloc(sizeof(*result));
|
|
|
+ if (result) {
|
|
|
+ result->field_count = ctx.field_count;
|
|
|
+ result->fields = ctx.fields;
|
|
|
+ ctx.fields = NULL;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ CleanupContext(&ctx);
|
|
|
+
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+bool SDL_DescriptorHasUsage(SDL_ReportDescriptor *descriptor, Uint16 usage_page, Uint16 usage)
|
|
|
+{
|
|
|
+ if (!descriptor) {
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ Uint32 full_usage = (((Uint32)usage_page << 16) | usage);
|
|
|
+ for (int i = 0; i < descriptor->field_count; ++i) {
|
|
|
+ if (descriptor->fields[i].usage == full_usage) {
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+void SDL_DestroyDescriptor(SDL_ReportDescriptor *descriptor)
|
|
|
+{
|
|
|
+ if (descriptor) {
|
|
|
+ SDL_free(descriptor->fields);
|
|
|
+ SDL_free(descriptor);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+bool SDL_ReadReportData(const Uint8 *data, int size, int bit_offset, int bit_size, unsigned int *value)
|
|
|
+{
|
|
|
+ int offset = (bit_offset / 8);
|
|
|
+ if (offset >= size) {
|
|
|
+ *value = 0;
|
|
|
+ return SDL_SetError("Out of bounds reading report data");
|
|
|
+ }
|
|
|
+
|
|
|
+ *value = ReadValue(data + offset, (bit_size + 7) / 8);
|
|
|
+
|
|
|
+ int shift = (bit_offset % 8);
|
|
|
+ if (shift > 0) {
|
|
|
+ *value >>= shift;
|
|
|
+ }
|
|
|
+
|
|
|
+ switch (bit_size) {
|
|
|
+ case 1:
|
|
|
+ *value &= 0x1;
|
|
|
+ break;
|
|
|
+ case 4:
|
|
|
+ *value &= 0xf;
|
|
|
+ break;
|
|
|
+ case 10:
|
|
|
+ *value &= 0x3ff;
|
|
|
+ break;
|
|
|
+ case 15:
|
|
|
+ *value &= 0x7fff;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ SDL_assert((bit_size % 8) == 0);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return true;
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef TEST_MAIN
|
|
|
+
|
|
|
+#include <SDL3/SDL_main.h>
|
|
|
+
|
|
|
+int main(int argc, char *argv[])
|
|
|
+{
|
|
|
+ const char *file = argv[1];
|
|
|
+ if (argc < 2) {
|
|
|
+ SDL_Log("Usage: %s file", argv[0]);
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ size_t descriptor_size = 0;
|
|
|
+ Uint8 *descriptor = SDL_LoadFile(argv[1], &descriptor_size);
|
|
|
+ if (!descriptor) {
|
|
|
+ SDL_Log("Couldn't load %s: %s", argv[1], SDL_GetError());
|
|
|
+ return 2;
|
|
|
+ }
|
|
|
+
|
|
|
+ DescriptorContext ctx;
|
|
|
+ if (!ParseDescriptor(&ctx, descriptor, descriptor_size)) {
|
|
|
+ SDL_Log("Couldn't parse %s: %s", argv[1], SDL_GetError());
|
|
|
+ return 3;
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+#endif // TEST_MAIN
|
Sam Lantinga