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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
------------------------------------------- */
#ifdef __FSKIT_INCLUDES_HEFS__
#include <modules/AHCI/AHCI.h>
#include <modules/ATA/ATA.h>
#include <FSKit/HeFS.h>
#include <KernelKit/KPC.h>
#include <NewKit/Crc32.h>
#include <NewKit/KernelPanic.h>
#include <NewKit/KString.h>
#include <NewKit/Utils.h>
#include <FirmwareKit/EPM.h>
#include <FirmwareKit/GPT.h>
#include <KernelKit/ProcessScheduler.h>
#include <KernelKit/User.h>
namespace Kernel
{
namespace Detail
{
/// @brief Forward declarations of internal functions.
/// @brief Get the index node of a file or directory.
/// @param root The root node of the filesystem.
/// @param mnt The drive to read from.
/// @param dir_name The name of the directory.
/// @param file_name The name of the file.
/// @param kind The kind of the file (regular, directory, block, character, FIFO, socket, symbolic link, unknown).
STATIC HEFS_INDEX_NODE* hefs_fetch_index_node(HEFS_BOOT_NODE* root, DriveTrait* mnt, const Utf16Char* dir_name, const Utf16Char* file_name, UInt8 kind) noexcept;
/// @brief Allocate a new index node.
/// @param root The root node of the filesystem.
/// @param mnt The drive to read from.
/// @param parent_dir_name The name of the parent directory.
/// @return Status, see err_global_get().
STATIC BOOL hefs_allocate_index_node(HEFS_BOOT_NODE* root, DriveTrait* mnt, const Utf16Char* parent_dir_name, HEFS_INDEX_NODE* node) noexcept;
/// @brief Get the index node of a file or directory.
/// @param root The root node of the filesystem.
/// @param mnt The drive to read from.
/// @param dir_name The name of the directory.
/// @param file_name The name of the file.
/// @param kind The kind of the file (regular, directory, block, character, FIFO, socket, symbolic link, unknown).
STATIC HEFS_INDEX_NODE* hefs_fetch_index_node(HEFS_BOOT_NODE* root, DriveTrait* mnt, const Utf16Char* dir_name, const Utf16Char* file_name, UInt8 kind) noexcept
{
if (root)
{
HEFS_INDEX_NODE* node = new HEFS_INDEX_NODE();
HEFS_INDEX_NODE_DIRECTORY* dir = new HEFS_INDEX_NODE_DIRECTORY();
if (!node)
{
kout << "Error: Failed to allocate memory for index node.\r";
return nullptr;
}
auto start = root->fStartIND;
auto end = root->fEndIND;
auto hop_watch = 0;
while (start != end)
{
if (hop_watch > 100)
{
kout << "Error: Hop watch exceeded, filesystem is stalling.\r";
break;
}
if (start == 0)
{
++hop_watch;
start = root->fStartIND;
}
mnt->fPacket.fPacketLba = start;
mnt->fPacket.fPacketSize = sizeof(HEFS_INDEX_NODE_DIRECTORY);
mnt->fPacket.fPacketContent = dir;
mnt->fInput(mnt->fPacket);
if (!mnt->fPacket.fPacketGood)
{
delete node;
delete dir;
dir = nullptr;
node = nullptr;
err_global_get() = kErrorFileNotFound;
return nullptr;
}
if (dir->fKind == kHeFSFileKindDirectory)
{
if (KStringBuilder::Equals(dir_name, dir->fName))
{
for (SizeT inode_index = 0UL; inode_index < kHeFSBlockCount; ++inode_index)
{
if (dir->fIndexNodeStart[inode_index] != 0 ||
dir->fIndexNodeEnd[inode_index] != 0)
{
mnt->fPacket.fPacketLba = (!dir->fIndexNodeStart[inode_index]) ? dir->fIndexNodeEnd[inode_index] : dir->fIndexNodeStart[inode_index];
mnt->fPacket.fPacketSize = sizeof(HEFS_INDEX_NODE);
mnt->fPacket.fPacketContent = node;
mnt->fInput(mnt->fPacket);
if (mnt->fPacket.fPacketGood)
{
if (KStringBuilder::Equals(file_name, node->fName) && node->fKind == kind)
{
delete dir;
dir = nullptr;
return node;
}
}
else
{
err_global_get() = kErrorDiskIsCorrupted;
delete dir;
delete node;
dir = nullptr;
node = nullptr;
return nullptr;
}
}
}
}
}
start = dir->fNext;
if (dir->fColor == kHeFSBlack)
{
if (dir->fParent != 0)
start = dir->fParent;
}
else
{
if (dir->fChild != 0)
start = dir->fChild;
else if (dir->fNext != 0)
start = dir->fNext;
else if (dir->fPrev != 0)
start = dir->fPrev;
else
start = dir->fParent;
}
}
delete dir;
delete node;
dir = nullptr;
node = nullptr;
}
kout << "Error: Failed to find index node.\r";
err_global_get() = kErrorFileNotFound;
return nullptr;
}
/// @brief Allocate a new index node.
/// @param root The root node of the filesystem.
/// @param mnt The drive to read from.
/// @param parent_dir_name The name of the parent directory.
/// @return Status, see err_global_get().
STATIC BOOL hefs_allocate_index_node(HEFS_BOOT_NODE* root, DriveTrait* mnt, const Utf16Char* parent_dir_name, HEFS_INDEX_NODE* node) noexcept
{
NE_UNUSED(root);
NE_UNUSED(mnt);
NE_UNUSED(parent_dir_name);
NE_UNUSED(node);
return NO;
}
} // namespace Detail
} // namespace Kernel
/// @note HeFS will allocate inodes and ind in advance, to avoid having to allocate them in real-time.
/// @note This is certainly take longer to format a disk with it, but worth-it in the long run.
#endif // ifdef __FSKIT_INCLUDES_HEFS__
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