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/* ========================================
Copyright (C) 2024-2025 Amlal El Mahrouss , licensed under the Apache 2.0 license.
======================================== */
#include <KernelKit/FileMgr.h>
#include <SwapKit/DiskSwap.h>
namespace Kernel {
static constexpr UInt32 kSwapDiskHeaderMagic = 0x44535750; // 'DSWP'
/***********************************************************************************/
/// @brief Write memory chunk onto disk.
/// @param fork_name The swap name to recognize this memory region.
/// @param fork_name_len length of fork name.
/// @param data the data packet.
/// @return Whether the swap was written to disk, or not.
/***********************************************************************************/
BOOL DiskSwapInterface::Write(const Char* fork_name, SizeT fork_name_len, SWAP_DISK_HEADER* data) {
if (!fork_name || !fork_name_len) return NO;
if (*fork_name == 0) return NO;
if (!data || data->fMagic != kSwapDiskHeaderMagic) return NO;
FileStream file(kSwapPageFilePath, kRestrictWRB);
ErrorOr<Int64> ret = file.Write(fork_name, data, sizeof(SWAP_DISK_HEADER) + data->fBlobSz);
if (ret.Error()) return NO;
return YES;
}
/***********************************************************************************/
/// @brief Read memory chunk from disk.
/// @param fork_name The swap name to recognize this memory region.
/// @param fork_name_len length of fork name.
/// @param data the data packet length.
/// @return Whether the swap was fetched to disk, or not.
/***********************************************************************************/
SWAP_DISK_HEADER* DiskSwapInterface::Read(const Char* fork_name, SizeT fork_name_len,
SizeT data_len) {
if (!fork_name || !fork_name_len) return nullptr;
if (*fork_name == 0) return nullptr;
if (data_len > kSwapBlockMaxSize) return nullptr;
if (data_len == 0) return nullptr;
FileStream file(kSwapPageFilePath, kRestrictRB);
VoidPtr blob = file.Read(fork_name, sizeof(SWAP_DISK_HEADER) + data_len);
if (!blob || ((SWAP_DISK_HEADER*) blob)->fMagic != kSwapDiskHeaderMagic) {
if (blob) mm_free_ptr(blob);
return nullptr;
}
return reinterpret_cast<SWAP_DISK_HEADER*>(blob);
}
} // namespace Kernel
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