From 3833a92d5823f0f54030dedbcadbda4ef8583b41 Mon Sep 17 00:00:00 2001
From: Alexis211 <alexis211@gmail.com>
Date: Sun, 15 Nov 2009 19:33:04 +0100
Subject: Screwy implementation of FATFS::read

---
 Grub-menu.cfg                                 |  8 ++++++++
 Makefile                                      |  2 ++
 Source/Kernel/Core/Sys.ns.cpp                 |  2 +-
 Source/Kernel/FileSystems/FAT/FATFS.class.cpp | 28 +++++++++++++++++++++++++--
 4 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/Grub-menu.cfg b/Grub-menu.cfg
index 870179a..5fe0cf5 100644
--- a/Grub-menu.cfg
+++ b/Grub-menu.cfg
@@ -19,3 +19,11 @@ title	Game of life simulator
 root	(fd0)
 kernel	/Melon.ke init:/Applications/Demos/GOL.app
 module	/Init.rfs
+
+#kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
+#kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
+#ooooooooooooooooooooooooooooooooooooooooooooooooooo
+#---------------------------------------------------
+
+
+#@.@
diff --git a/Makefile b/Makefile
index 33205ff..98a9dd5 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,8 @@ floppy: $(Files)
 	for f in $(Files); do \
 		sudo cp $$f Mount; \
 	done
+	sudo cp Source/Applications/Demos/GOL Mount/GOL.app
+	sudo cp Source/Applications/Demos/asmdemo Mount/ASM.dem
 	sleep 0.4
 	sudo umount Mount
 
diff --git a/Source/Kernel/Core/Sys.ns.cpp b/Source/Kernel/Core/Sys.ns.cpp
index eeb92ee..49b2725 100644
--- a/Source/Kernel/Core/Sys.ns.cpp
+++ b/Source/Kernel/Core/Sys.ns.cpp
@@ -83,7 +83,7 @@ void dumpRegs(registers_t *regs, VirtualTerminal& vt) {
 
 void stackTrace(u32int ebp, VirtualTerminal& vt, u32int maxframes) {
 	u32int *stack = (u32int*)ebp;
-	for (u32int i = 0; i < maxframes and (u32int)stack > 0xC0000000; i++) {
+	for (u32int i = 0; i < maxframes and (u32int)stack > 0xC0000000 and (u32int)stack < (ebp + 0x10000); i++) {
 		vt << "Frame: " << (u32int)stack << " n:" << stack[0] << " r:" << stack[1] << "\n";
 		stack = (u32int*)stack[0];
 	}
diff --git a/Source/Kernel/FileSystems/FAT/FATFS.class.cpp b/Source/Kernel/FileSystems/FAT/FATFS.class.cpp
index 2590785..00107e5 100644
--- a/Source/Kernel/FileSystems/FAT/FATFS.class.cpp
+++ b/Source/Kernel/FileSystems/FAT/FATFS.class.cpp
@@ -50,7 +50,8 @@ FATFS* FATFS::mount(Partition* p, DirectoryNode* mountpoint) {
 	*kvt << "\nDetected a FAT" << (s64int)fs->m_fatType << " filesystem.\n" <<
 		"root_dir_sectors:" << fs->m_rootDirSectors << " fat_size:" << fs->m_fatSize << " total_sectors:" <<
 		fs->m_totalSectors << " data_sectors:" << dataSectors << " count_of_clusters:" << fs->m_countOfClusters <<
-		" sizeof(fat_dir_entry_t):" << sizeof(fat_dir_entry_t) << " first_data_sector:" << fs->m_firstDataSector;
+		" sizeof(fat_dir_entry_t):" << sizeof(fat_dir_entry_t) << " first_data_sector:" << fs->m_firstDataSector <<
+		" cluster_size:" << fs->m_clusterSize;
 	return 0;
 }
 
@@ -122,7 +123,30 @@ bool FATFS::setParent(FSNode* node, FSNode* parent) {
 }
 
 u32int FATFS::read(FileNode* file, u64int position, u32int max_length, u8int *data) {
-	return 0;
+	u32int len = max_length;
+	if (position >= file->getLength()) return 0;
+	if (position + len > file->getLength()) len = len - position;
+	u32int firstCluster = position / m_clusterSize, clusterOffset = position % m_clusterSize;
+	u32int clusters = (len + clusterOffset) / m_clusterSize + 1, lastClusBytesToRead = (len + clusterOffset) % m_clusterSize;
+	u32int clust = FIRSTCLUS(file);
+	//Find first cluster
+	for (u32int i = 0; i < firstCluster and clust != 0; i++) clust = nextCluster(clust);
+	if (clust == 0) return 0;
+	//Read first cluster
+	u8int* temp = (u8int*)Mem::alloc(m_clusterSize);
+	readCluster(clust, temp);
+	memcpy(data, temp + clusterOffset, (m_clusterSize - clusterOffset));
+	//Read next clusters
+	u32int pos = (m_clusterSize - clusterOffset);
+	for (u32int i = 1; i < clusters; i++) {
+		clust = nextCluster(clust);
+		if (clust == 0) break;
+		readCluster(clust, temp);
+		memcpy(data + pos, temp, (i == clusters - 1 ? lastClusBytesToRead : m_clusterSize));
+		pos += m_clusterSize;
+	}
+	Mem::free(temp);
+	return len;
 }
 
 bool FATFS::write(FileNode* file, u64int position, u32int length, u8int* data) {
-- 
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