INITIAL COMMIT

src/wapp/uuid/uuid.c

@@ -0,0 +1,58 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "uuid.h"
+#include "../common/aliases/aliases.h"
+#include "../common/assert/assert.h"
+#include "../base/strings/str8/str8.h"
+#include "../prng/xorshift/xorshift.h"
+#include <inttypes.h>
+
+#define UUID_STR_FORMAT ("%.8" PRIx64 "-%.4" PRIx64 "-%.4" PRIx64 "-%.4" PRIx64 "-%.12" PRIx64)
+
+typedef struct UUID4 UUID4;
+struct UUID4 {
+	u64 high;
+	u64 low;
+};
+
+wp_intern UUID4 generate_uuid4(void);
+wp_intern void  uuid4_to_uuid(const UUID4* uuid4, WpUuid *uuid);
+
+WpUuid *wpUuidInitUuid4(WpUuid *uuid) {
+	wpDebugAssert(uuid != NULL, "`uuid` should not be NULL");
+
+	UUID4 uuid4 = generate_uuid4();
+	uuid4_to_uuid(&uuid4, uuid);
+
+	return uuid;
+}
+
+wp_intern UUID4 generate_uuid4(void) {
+	wp_persist WpXor256State state = {0};
+	wp_persist b8 initialised = false;
+
+	if (!initialised) {
+		initialised = true;
+		state       = wpPrngXorshiftInit();
+	}
+
+	UUID4 uuid = (UUID4){
+		.high  = wpPrngXorshift256(&state),
+		.low  = wpPrngXorshift256(&state),
+	};
+
+	uuid.high = (uuid.high  & 0xffffffffffff0fff) | 0x0000000000004000;
+	uuid.low  = (uuid.low   & 0x3fffffffffffffff) | 0x8000000000000000;
+
+	return uuid;
+}
+
+wp_intern void uuid4_to_uuid(const UUID4* uuid4, WpUuid *uuid) {
+	u64 group1 = uuid4->high >> 32;
+	u64 group2 = (uuid4->high << 32) >> 48;
+	u64 group3 = (uuid4->high << 48) >> 48;
+	u64 group4 = uuid4->low >> 48;
+	u64 group5 = (uuid4->low << 16) >> 16;
+
+	wpStr8Format(&(uuid->uuid), UUID_STR_FORMAT, group1, group2, group3, group4, group5);
+}

src/wapp/uuid/uuid.h

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+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef UUID_H
+#define UUID_H
+
+#include "../common/aliases/aliases.h"
+#include "../common/platform/platform.h"
+#include "../base/strings/str8/str8.h"
+
+#ifdef WP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WP_PLATFORM_CPP
+
+#define WP_UUID_BUF_LENGTH 48
+#define WP_UUID_SPEC WP_STR8_SPEC
+#define wpUuidVarg(WpUuid) wpStr8Varg((WpUuid).uuid)
+
+typedef struct WpUuid WpUuid;
+struct WpUuid {
+	WpStr8 uuid;
+};
+
+// TODO (Abdelrahman): Update UUID implementation to work properly with C++ and tests for validation
+
+#ifdef WP_PLATFORM_CPP
+#define wpUuidGenUuid4() ([&](){           \
+	wp_persist WpUuid uuid = wpUuidCreate(); \
+	return *(wpUuidInitUuid4(&uuid));        \
+}())
+#else
+#define wpUuidGenUuid4() *(wpUuidInitUuid4(&wpUuidCreate()))
+#endif
+
+/* Low level UUID API */
+
+#ifdef WP_PLATFORM_CPP
+#define wpUuidCreate() ([&](){ return WpUuid{wpStr8Buf(WP_UUID_BUF_LENGTH)}; }())
+#else
+#define wpUuidCreate() ((WpUuid){.uuid = wpStr8Buf(WP_UUID_BUF_LENGTH)})
+#endif
+
+// Just returns the same pointer that was passed in with the UUID initialised.
+// Fails when passed a NULL pointer.
+WpUuid *wpUuidInitUuid4(WpUuid *uuid);
+
+#ifdef WP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WP_PLATFORM_CPP
+
+#endif // !UUID_H

src/wapp/uuid/wapp_uuid.c

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+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef WAPP_UUID_C
+#define WAPP_UUID_C
+
+#include "uuid.c"
+#include "../base/wapp_base.c"
+#include "../prng/wapp_prng.c"
+
+#endif // !WAPP_UUID_C

src/wapp/uuid/wapp_uuid.h

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+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef WAPP_UUID_H
+#define WAPP_UUID_H
+
+#include "uuid.h"
+#include "../common/wapp_common.h"
+#include "../base/wapp_base.h"
+#include "../prng/wapp_prng.h"
+
+#endif // !WAPP_UUID_H