Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers...

[reactos.git] / boot / environ / lib / io / fat.c

diff --git a/boot/environ/lib/io/fat.c b/boot/environ/lib/io/fat.c
new file mode 100644 (file)
index 0000000..5612a89
--- /dev/null
+++ b/boot/environ/lib/io/fat.c
@@ -0,0 +1,110 @@
+/*
+ * COPYRIGHT:       See COPYING.ARM in the top level directory
+ * PROJECT:         ReactOS UEFI Boot Library
+ * FILE:            boot/environ/lib/io/fat.c
+ * PURPOSE:         Boot Library FAT File System Management Routines
+ * PROGRAMMER:      Alex Ionescu (alex.ionescu@reactos.org)
+ */
+
+/* INCLUDES ******************************************************************/
+
+#include <bl.h>
+#include <fs_rec/fs_rec.h>
+
+/* DATA VARIABLES ************************************************************/
+
+PVOID* FatDeviceTable;
+ULONG FatDeviceTableEntries;
+PWCHAR FatpLongFileName;
+
+/* FUNCTIONS *****************************************************************/
+
+NTSTATUS
+FatMount (
+    _In_ ULONG DeviceId,
+    _In_ ULONG Unknown,
+    _Out_ PBL_FILE_ENTRY* FileEntry
+    )
+{
+    BL_DEVICE_INFORMATION DeviceInformation;
+    ULONG UnknownFlag;
+    NTSTATUS Status;
+    PACKED_BOOT_SECTOR FatBootSector;
+    BIOS_PARAMETER_BLOCK BiosBlock;
+
+    /* Capture thing */
+    BlDeviceGetInformation(DeviceId, &DeviceInformation);
+    UnknownFlag = DeviceInformation.BlockDeviceInfo.Unknown;
+
+    /* Set thing to 1 */
+    DeviceInformation.BlockDeviceInfo.Unknown |= 1;
+    BlDeviceSetInformation(DeviceId, &DeviceInformation);
+
+    /* Read the boot sector */
+    Status = BlDeviceReadAtOffset(DeviceId,
+                                  sizeof(FatBootSector),
+                                  0,
+                                  &FatBootSector,
+                                  NULL);
+
+    /* Restore thing back */
+    DeviceInformation.BlockDeviceInfo.Unknown = UnknownFlag;
+    BlDeviceSetInformation(DeviceId, &DeviceInformation);
+    if (!NT_SUCCESS(Status))
+    {
+        EfiPrintf(L"Failed reading drive: %lx\r\n", Status);
+        return Status;
+    }
+
+    FatUnpackBios(&BiosBlock, &FatBootSector.PackedBpb);
+
+    /* For now, quickly fail if this isn't FAT */
+    if (FatBootSector.Jump[0] != 0xE9)
+    {
+        return STATUS_UNSUCCESSFUL;
+    }
+
+    EfiPrintf(L"Jump: %lx Bytes Per Sector: %d Sectors Per Cluster: %d Reserved: %d Fats: %d Sectors: %d Large Sectors: %d Media: %lx RootEntries: %d\r\n",
+              FatBootSector.Jump[0],
+              BiosBlock.BytesPerSector,
+              BiosBlock.SectorsPerCluster,
+              BiosBlock.ReservedSectors,
+              BiosBlock.Fats,
+              BiosBlock.Sectors,
+              BiosBlock.LargeSectors,
+              BiosBlock.Media,
+              BiosBlock.RootEntries);
+    return STATUS_NOT_IMPLEMENTED;
+}
+
+NTSTATUS
+FatInitialize (
+    VOID
+    )
+{
+    NTSTATUS Status;
+
+    /* Allocate the device table with 2 entries*/
+    FatDeviceTableEntries = 2;
+    FatDeviceTable = BlMmAllocateHeap(sizeof(PBL_FILE_ENTRY) *
+                                      FatDeviceTableEntries);
+    if (FatDeviceTable)
+    {
+        /* Zero it out */
+        RtlZeroMemory(FatDeviceTable,
+                      sizeof(PBL_FILE_ENTRY) * FatDeviceTableEntries);
+
+        /* Allocate a 512 byte buffer for long file name conversion */
+        FatpLongFileName = BlMmAllocateHeap(512);
+        Status = FatpLongFileName != NULL ? STATUS_SUCCESS : STATUS_NO_MEMORY;
+    }
+    else
+    {
+        /* No memory, fail */
+        Status = STATUS_NO_MEMORY;
+    }
+
+    /* Return back to caller */
+    return Status;
+}
+