Clib/EFI: Add file position seeking/telling support

This patch adds file position seeking/telling support. Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>

2 files changed, 171 insertions, 2 deletions

diff --git a/source/include/platform/acefiex.h b/source/include/platform/acefiex.h
index 9f5b9208c..e90b89712 100644
--- a/source/include/platform/acefiex.h
+++ b/source/include/platform/acefiex.h
@@ -167,6 +167,20 @@ typedef struct {
     UINT8   Data4[8];
 } ACPI_EFI_GUID;
 
+typedef struct {
+    UINT16 Year;       /* 1998 - 20XX */
+    UINT8  Month;      /* 1 - 12 */
+    UINT8  Day;        /* 1 - 31 */
+    UINT8  Hour;       /* 0 - 23 */
+    UINT8  Minute;     /* 0 - 59 */
+    UINT8  Second;     /* 0 - 59 */
+    UINT8  Pad1;
+    UINT32 Nanosecond; /* 0 - 999,999,999 */
+    INT16  TimeZone;   /* -1440 to 1440 or 2047 */
+    UINT8  Daylight;
+    UINT8  Pad2;
+} ACPI_EFI_TIME;
+
 typedef struct _ACPI_EFI_DEVICE_PATH {
         UINT8                           Type;
         UINT8                           SubType;
@@ -447,6 +461,22 @@ ACPI_EFI_STATUS
     struct _ACPI_EFI_FILE_HANDLE                *File,
     UINT64                                      *Position);
 
+#define ACPI_EFI_FILE_INFO_ID \
+    { 0x9576e92, 0x6d3f, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b} }
+
+typedef struct {
+    UINT64 Size;
+    UINT64 FileSize;
+    UINT64 PhysicalSize;
+    ACPI_EFI_TIME CreateTime;
+    ACPI_EFI_TIME LastAccessTime;
+    ACPI_EFI_TIME ModificationTime;
+    UINT64 Attribute;
+    CHAR16 FileName[1];
+} ACPI_EFI_FILE_INFO;
+
+#define SIZE_OF_ACPI_EFI_FILE_INFO  ACPI_OFFSET(ACPI_EFI_FILE_INFO, FileName)
+
 typedef
 ACPI_EFI_STATUS
 (ACPI_EFI_API *ACPI_EFI_FILE_GET_INFO) (
@@ -1018,5 +1048,6 @@ extern ACPI_EFI_GUID AcpiGbl_LoadedImageProtocol;
 extern ACPI_EFI_GUID AcpiGbl_TextInProtocol;
 extern ACPI_EFI_GUID AcpiGbl_TextOutProtocol;
 extern ACPI_EFI_GUID AcpiGbl_FileSystemProtocol;
+extern ACPI_EFI_GUID AcpiGbl_GenericFileInfo;
 
 #endif /* __ACEFIEX_H__ */
diff --git a/source/os_specific/efi/oseficlib.c b/source/os_specific/efi/oseficlib.c
index 96b6f9f9c..333031801 100644
--- a/source/os_specific/efi/oseficlib.c
+++ b/source/os_specific/efi/oseficlib.c
@@ -153,6 +153,11 @@ AcpiEfiConvertArgcv (
     char                    ***ArgvPtr,
     char                    **BufferPtr);
 
+static int
+AcpiEfiGetFileInfo (
+    FILE                    *File,
+    ACPI_EFI_FILE_INFO      **InfoPtr);
+
 static CHAR16 *
 AcpiEfiFlushFile (
     FILE                    *File,
@@ -172,6 +177,7 @@ ACPI_EFI_GUID               AcpiGbl_LoadedImageProtocol = ACPI_EFI_LOADED_IMAGE_
 ACPI_EFI_GUID               AcpiGbl_TextInProtocol = ACPI_SIMPLE_TEXT_INPUT_PROTOCOL;
 ACPI_EFI_GUID               AcpiGbl_TextOutProtocol = ACPI_SIMPLE_TEXT_OUTPUT_PROTOCOL;
 ACPI_EFI_GUID               AcpiGbl_FileSystemProtocol = ACPI_SIMPLE_FILE_SYSTEM_PROTOCOL;
+ACPI_EFI_GUID               AcpiGbl_GenericFileInfo = ACPI_EFI_FILE_INFO_ID;
 
 int                         errno = 0;
 
@@ -683,11 +689,68 @@ ErrorExit:
 
 /*******************************************************************************
  *
+ * FUNCTION:    AcpiEfiGetFileInfo
+ *
+ * PARAMETERS:  File                - File descriptor
+ *              InfoPtr             - Pointer to contain file information
+ *
+ * RETURN:      Clibrary error code
+ *
+ * DESCRIPTION: Get file information.
+ *
+ ******************************************************************************/
+
+static int
+AcpiEfiGetFileInfo (
+    FILE                    *File,
+    ACPI_EFI_FILE_INFO      **InfoPtr)
+{
+    ACPI_EFI_STATUS         EfiStatus = ACPI_EFI_BUFFER_TOO_SMALL;
+    ACPI_EFI_FILE_INFO      *Buffer = NULL;
+    UINTN                   BufferSize = SIZE_OF_ACPI_EFI_FILE_INFO + 200;
+    ACPI_EFI_FILE_HANDLE    EfiFile;
+
+
+    if (!InfoPtr)
+    {
+        errno = EINVAL;
+        return (-EINVAL);
+    }
+
+    while (EfiStatus == ACPI_EFI_BUFFER_TOO_SMALL)
+    {
+        EfiFile = (ACPI_EFI_FILE_HANDLE) File;
+        Buffer = AcpiOsAllocate (BufferSize);
+        if (!Buffer)
+        {
+            errno = ENOMEM;
+            return (-ENOMEM);
+        }
+        EfiStatus = uefi_call_wrapper (EfiFile->GetInfo, 4, EfiFile,
+            &AcpiGbl_GenericFileInfo, &BufferSize, Buffer);
+        if (ACPI_EFI_ERROR (EfiStatus))
+        {
+            AcpiOsFree (Buffer);
+            if (EfiStatus != ACPI_EFI_BUFFER_TOO_SMALL)
+            {
+                errno = EIO;
+                return (-EIO);
+            }
+        }
+    }
+
+    *InfoPtr = Buffer;
+    return (0);
+}
+
+
+/*******************************************************************************
+ *
  * FUNCTION:    ftell
  *
  * PARAMETERS:  File                - File descriptor
  *
- * RETURN:      Size of current position
+ * RETURN:      current position
  *
  * DESCRIPTION: Get current file offset.
  *
@@ -698,8 +761,32 @@ ftell (
     FILE                    *File)
 {
     long                    Offset = -1;
+    UINT64                  Current;
+    ACPI_EFI_STATUS         EfiStatus;
+    ACPI_EFI_FILE_HANDLE    EfiFile;
+
 
+    if (File == stdin || File == stdout || File == stderr)
+    {
+        Offset = 0;
+    }
+    else
+    {
+        EfiFile = (ACPI_EFI_FILE_HANDLE) File;
+
+        EfiStatus = uefi_call_wrapper (EfiFile->GetPosition, 2,
+            EfiFile, &Current);
+        if (ACPI_EFI_ERROR (EfiStatus))
+        {
+            goto ErrorExit;
+        }
+        else
+        {
+            Offset = (long) Current;
+        }
+    }
 
+ErrorExit:
     return (Offset);
 }
 
@@ -724,8 +811,59 @@ fseek (
     long                    Offset,
     int                     From)
 {
+    ACPI_EFI_FILE_INFO      *Info;
+    int                     Error;
+    ACPI_SIZE               Size;
+    UINT64                  Current;
+    ACPI_EFI_STATUS         EfiStatus;
+    ACPI_EFI_FILE_HANDLE    EfiFile;
+
+
+    if (File == stdin || File == stdout || File == stderr)
+    {
+        return (0);
+    }
+    else
+    {
+        EfiFile = (ACPI_EFI_FILE_HANDLE) File;
+        Error = AcpiEfiGetFileInfo (File, &Info);
+        if (Error)
+        {
+            return (Error);
+        }
+        Size = Info->FileSize;
+        AcpiOsFree (Info);
+
+        if (From == SEEK_CUR)
+        {
+            EfiStatus = uefi_call_wrapper (EfiFile->GetPosition, 2,
+                EfiFile, &Current);
+            if (ACPI_EFI_ERROR (EfiStatus))
+            {
+                errno = ERANGE;
+                return (-ERANGE);
+            }
+            Current += Offset;
+        }
+        else if (From == SEEK_END)
+        {
+            Current = Size - Offset;
+        }
+        else
+        {
+            Current = Offset;
+        }
 
-    return (-1);
+        EfiStatus = uefi_call_wrapper (EfiFile->SetPosition, 2,
+            EfiFile, Current);
+        if (ACPI_EFI_ERROR (EfiStatus))
+        {
+            errno = ERANGE;
+            return (-ERANGE);
+        }
+    }
+
+    return (0);
 }