From: John Hodge <tpg@mutabah.net>
Date: Tue, 14 May 2013 07:48:17 +0000 (+0800)
Subject: Kernel - Added fast random (ala /dev/urandom), good random is stubbed
X-Git-Tag: rel0.15~483
X-Git-Url: https://git.ucc.asn.au/?a=commitdiff_plain;h=344c700061dfe97b5e96211ec9257671fd5a7f33;p=tpg%2Facess2.git

Kernel - Added fast random (ala /dev/urandom), good random is stubbed
---

diff --git a/KernelLand/Kernel/drv/zero-one.c b/KernelLand/Kernel/drv/zero-one.c
index 824f9276..fd14ed1b 100644
--- a/KernelLand/Kernel/drv/zero-one.c
+++ b/KernelLand/Kernel/drv/zero-one.c
@@ -16,6 +16,8 @@ size_t	CoreDevs_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *
 size_t	CoreDevs_Read_Zero(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer);
 size_t	CoreDevs_Read_One (tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer);
 size_t	CoreDevs_Read_Null(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer);
+size_t	CoreDevs_Read_FRandom(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer);
+size_t	CoreDevs_Read_GRandom(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer);
 
 // === GLOBALS ===
 MODULE_DEFINE(0, 0x0100, CoreDevs, CoreDevs_Install, NULL, NULL);
@@ -34,11 +36,20 @@ tVFS_NodeType	gCoreDevs_NT_One = {
 	.Read  = CoreDevs_Read_One,
 	.Write = CoreDevs_Write
 };
+tVFS_NodeType	gCoreDevs_NT_FRandom = {
+	.TypeName = "CoreDevs-frandom",
+	.Read  = CoreDevs_Read_FRandom,
+	.Write = CoreDevs_Write
+};
+tVFS_NodeType	gCoreDevs_NT_GRandom = {
+	.TypeName = "CoreDevs-grandom",
+	.Read  = CoreDevs_Read_GRandom,
+	.Write = CoreDevs_Write
+};
 tDevFS_Driver	gCoreDevs_Null = {
 	NULL, "null",
 	{
-	.Size = 0,
-	.NumACLs = 1,
+	.Size = 0, .NumACLs = 1,
 	.ACLs = &gVFS_ACL_EveryoneRW,
 	.Type = &gCoreDevs_NT_Null
 	}
@@ -46,8 +57,7 @@ tDevFS_Driver	gCoreDevs_Null = {
 tDevFS_Driver	gCoreDevs_Zero = {
 	NULL, "zero",
 	{
-	.Size = 0,
-	.NumACLs = 1,
+	.Size = 0, .NumACLs = 1,
 	.ACLs = &gVFS_ACL_EveryoneRW,
 	.Type = &gCoreDevs_NT_Zero
 	}
@@ -55,12 +65,27 @@ tDevFS_Driver	gCoreDevs_Zero = {
 tDevFS_Driver	gCoreDevs_One = {
 	NULL, "one",
 	{
-	.Size = 0,
-	.NumACLs = 1,
+	.Size = 0, .NumACLs = 1,
 	.ACLs = &gVFS_ACL_EveryoneRW,
 	.Type = &gCoreDevs_NT_One
 	}
 };
+tDevFS_Driver	gCoreDevs_FRandom = {
+	NULL, "frandom",
+	{
+	.Size = 0, .NumACLs = 1,
+	.ACLs = &gVFS_ACL_EveryoneRW,
+	.Type = &gCoreDevs_NT_FRandom
+	}
+};
+tDevFS_Driver	gCoreDevs_GRandom = {
+	NULL, "grandom",
+	{
+	.Size = 0, .NumACLs = 1,
+	.ACLs = &gVFS_ACL_EveryoneRW,
+	.Type = &gCoreDevs_NT_GRandom
+	}
+};
 
 // === CODE ===
 /**
@@ -71,6 +96,8 @@ int CoreDevs_Install(char **Options)
 	DevFS_AddDevice( &gCoreDevs_Null );
 	DevFS_AddDevice( &gCoreDevs_Zero );
 	DevFS_AddDevice( &gCoreDevs_One  );
+	DevFS_AddDevice( &gCoreDevs_FRandom  );
+	//DevFS_AddDevice( &gCoreDevs_GRandom  );
 	return MODULE_ERR_OK;
 }
 
@@ -99,3 +126,18 @@ size_t CoreDevs_Read_Null(tVFS_Node *Node, off_t Offset, size_t Length, void *Bu
 	return 0;
 }
 
+//! Fast random number generator
+size_t CoreDevs_Read_FRandom(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer)
+{
+	Uint8	*cbuf = Buffer;
+	for( int i = 0; i < Length; i ++ )
+		*cbuf++ = rand();
+	return Length;
+}
+
+size_t CoreDevs_Read_GRandom(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer)
+{
+	Log_Error("CoreDevs", "GRandom is unimplimented");
+	return -1;
+}
+