audk/ShellPkg/Library/UefiShellLevel2CommandsLib/Parse.c

/** @file
  Main file for Parse shell level 2 function.

  (C) Copyright 2013-2015 Hewlett-Packard Development Company, L.P.<BR>
  Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "UefiShellLevel2CommandsLib.h"

/**
  Check if data is coming from StdIn output.

  @param[in] None
 
  @retval TRUE  StdIn stream data available to parse 
  @retval FALSE StdIn stream data is not available to parse. 
**/
BOOLEAN
IsStdInDataAvailable (
  VOID
  )
{
  SHELL_FILE_HANDLE FileHandle;
  EFI_STATUS        Status;
  CHAR16            CharBuffer; 
  UINTN             CharSize;
  UINT64            OriginalFilePosition;

  Status               = EFI_SUCCESS; 
  FileHandle           = NULL;
  OriginalFilePosition = 0;

  if (ShellOpenFileByName (L">i", &FileHandle, EFI_FILE_MODE_READ, 0) == EFI_SUCCESS) {
    CharSize = sizeof(CHAR16);
    gEfiShellProtocol->GetFilePosition (FileHandle, &OriginalFilePosition);
    Status = gEfiShellProtocol->ReadFile (FileHandle, &CharSize, &CharBuffer);
    if (EFI_ERROR (Status) || (CharSize != sizeof(CHAR16))) {
      return FALSE;
    }
    gEfiShellProtocol->SetFilePosition(FileHandle, OriginalFilePosition);
  }

  if (FileHandle == NULL) {
    return FALSE;
  } else {
    return TRUE;
  }
}

/**
  Function to read a single line (up to but not including the \n) using StdIn data from a SHELL_FILE_HANDLE.

  If the position upon start is 0, then the Ascii Boolean will be set.  This should be
  maintained and not changed for all operations with the same file.

  @param[in]       Handle        SHELL_FILE_HANDLE to read from.
  @param[in, out]  Buffer        The pointer to buffer to read into.
  @param[in, out]  Size          The pointer to number of bytes in Buffer.
  @param[in]       Truncate      If the buffer is large enough, this has no effect.
                                 If the buffer is is too small and Truncate is TRUE,
                                 the line will be truncated.
                                 If the buffer is is too small and Truncate is FALSE,
                                 then no read will occur.

  @retval EFI_SUCCESS           The operation was successful.  The line is stored in
                                Buffer.
  @retval EFI_INVALID_PARAMETER Handle was NULL.
  @retval EFI_INVALID_PARAMETER Size was NULL.
  @retval EFI_BUFFER_TOO_SMALL  Size was not large enough to store the line.
                                Size was updated to the minimum space required.
**/
EFI_STATUS
ShellFileHandleReadStdInLine(
  IN SHELL_FILE_HANDLE          Handle,
  IN OUT CHAR16                 *Buffer,
  IN OUT UINTN                  *Size,
  IN BOOLEAN                    Truncate
  )
{
  EFI_STATUS  Status;
  CHAR16      CharBuffer;
  UINTN       CharSize;
  UINTN       CountSoFar;
  UINT64      OriginalFilePosition;


  if (Handle == NULL
    ||Size   == NULL
   ){
    return (EFI_INVALID_PARAMETER);
  }
  if (Buffer == NULL) {
    ASSERT(*Size == 0);
  } else {
    *Buffer = CHAR_NULL;
  }
  gEfiShellProtocol->GetFilePosition (Handle, &OriginalFilePosition);

  for (CountSoFar = 0;;CountSoFar++){
    CharBuffer = 0;
    CharSize = sizeof(CHAR16);
    Status = gEfiShellProtocol->ReadFile (Handle, &CharSize, &CharBuffer);
    if (  EFI_ERROR(Status)
       || CharSize == 0
       || (CharBuffer == L'\n')
     ){
      break;
    }
    //
    // if we have space save it...
    //
    if ((CountSoFar+1)*sizeof(CHAR16) < *Size){
      ASSERT(Buffer != NULL);
      ((CHAR16*)Buffer)[CountSoFar] = CharBuffer;
      ((CHAR16*)Buffer)[CountSoFar+1] = CHAR_NULL;
    }
  }

  //
  // if we ran out of space tell when...
  //
  if ((CountSoFar+1)*sizeof(CHAR16) > *Size){
    *Size = (CountSoFar+1)*sizeof(CHAR16);
    if (!Truncate) {
      gEfiShellProtocol->SetFilePosition(Handle, OriginalFilePosition);
    } else {
      DEBUG((DEBUG_WARN, "The line was truncated in ShellFileHandleReadLine"));
    }
    return (EFI_BUFFER_TOO_SMALL);
  }
  while(Buffer[StrLen(Buffer)-1] == L'\r') {
    Buffer[StrLen(Buffer)-1] = CHAR_NULL;
  }

  return (Status);
}


/**
  Function to read a single line using StdIn from a SHELL_FILE_HANDLE. The \n is not included in the returned
  buffer.  The returned buffer must be callee freed.

  If the position upon start is 0, then the Ascii Boolean will be set.  This should be
  maintained and not changed for all operations with the same file.

  @param[in]       Handle        SHELL_FILE_HANDLE to read from.

  @return                        The line of text from the file.
  @retval NULL                   There was not enough memory available.

  @sa ShellFileHandleReadLine
**/
CHAR16*
ParseReturnStdInLine (
  IN SHELL_FILE_HANDLE Handle
  )
{
  CHAR16          *RetVal;
  UINTN           Size;
  EFI_STATUS      Status;

  Size   = 0;
  RetVal = NULL;

  Status = ShellFileHandleReadStdInLine (Handle, RetVal, &Size, FALSE);
  if (Status == EFI_BUFFER_TOO_SMALL) {
    RetVal = AllocateZeroPool(Size);
    if (RetVal == NULL) {
      return (NULL);
    }
    Status = ShellFileHandleReadStdInLine (Handle, RetVal, &Size, FALSE);

  }
  if (EFI_ERROR(Status) && (RetVal != NULL)) {
    FreePool(RetVal);
    RetVal = NULL;
  }
  return (RetVal);
}

/**
  Handle stings for SFO Output with escape character ^ in a string
  1. Quotation marks in the string must be escaped by using a ^ character (i.e. ^"). 
  2. The ^ character may be inserted using ^^.

  @param[in]  String  The Unicode NULL-terminated string.
 
  @retval NewString   The new string handled for SFO.
**/
EFI_STRING
HandleStringWithEscapeCharForParse (
  IN      CHAR16  *String
  )
{
  EFI_STRING  NewStr;
  EFI_STRING  StrWalker;
  EFI_STRING  ReturnStr;

  if (String == NULL) {
    return NULL;
  }
  
  //
  // start to parse the input string.
  //
  NewStr = AllocateZeroPool (StrSize (String));
  if (NewStr == NULL) {
    return NULL;
  }
  ReturnStr = NewStr;
  StrWalker = String;
  while (*StrWalker != CHAR_NULL) {
    if (*StrWalker == L'^' && (*(StrWalker + 1) == L'^' || *(StrWalker + 1) == L'"')) {
      *NewStr = *(StrWalker + 1);
      StrWalker++;
    } else {
      *NewStr = *StrWalker;
    }
    StrWalker++;
    NewStr++;
  }
  
  return ReturnStr;
}


/**
  Do the actual parsing of the file.  the file should be SFO output from a 
  shell command or a similar format.

  @param[in] FileName               The filename to open.
  @param[in] TableName              The name of the table to find.
  @param[in] ColumnIndex            The column number to get.
  @param[in] TableNameInstance      Which instance of the table to get (row).
  @param[in] ShellCommandInstance   Which instance of the command to get.
  @param[in] StreamingUnicode       Indicates Input file is StdIn Unicode streaming data or not

  @retval SHELL_NOT_FOUND     The requested instance was not found.
  @retval SHELL_SUCCESS       The operation was successful.
**/
SHELL_STATUS
PerformParsing(
  IN CONST CHAR16 *FileName,
  IN CONST CHAR16 *TableName,
  IN CONST UINTN  ColumnIndex,
  IN CONST UINTN  TableNameInstance,
  IN CONST UINTN  ShellCommandInstance,
  IN BOOLEAN      StreamingUnicode
  )
{
  SHELL_FILE_HANDLE FileHandle;
  EFI_STATUS        Status;
  BOOLEAN           Ascii;
  UINTN             LoopVariable;
  UINTN             ColumnLoop;
  CHAR16            *TempLine;
  CHAR16            *ColumnPointer;
  SHELL_STATUS      ShellStatus;
  CHAR16            *TempSpot;
  CHAR16            *SfoString;

  ASSERT(FileName   != NULL);
  ASSERT(TableName  != NULL);

  ShellStatus       = SHELL_SUCCESS;

  Status = ShellOpenFileByName(FileName, &FileHandle, EFI_FILE_MODE_READ, 0);
  if (EFI_ERROR(Status)) {
    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_FILE_OPEN_FAIL), gShellLevel2HiiHandle, L"parse", FileName);  
    ShellStatus = SHELL_NOT_FOUND;
  } else if (!EFI_ERROR (FileHandleIsDirectory (FileHandle))) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_GEN_NOT_FILE), gShellLevel2HiiHandle, L"parse", FileName);  
    ShellStatus = SHELL_NOT_FOUND;
  } else {
    for (LoopVariable = 0 ; LoopVariable < ShellCommandInstance && !ShellFileHandleEof(FileHandle);) {
     if (StreamingUnicode) {
       TempLine = ParseReturnStdInLine (FileHandle);
     } else {
       TempLine = ShellFileHandleReturnLine (FileHandle, &Ascii); 
     }

      if ((TempLine == NULL) || (*TempLine == CHAR_NULL && StreamingUnicode)) {
         break;
      }

      //
      // Search for "ShellCommand," in the file to start the SFO table
      // for a given ShellCommand.  The UEFI Shell spec does not specify
      // a space after the comma.
      //
      if (StrStr (TempLine, L"ShellCommand,") == TempLine) {
        LoopVariable++;
      }
      SHELL_FREE_NON_NULL(TempLine);
    }
    if (LoopVariable == ShellCommandInstance) {
      LoopVariable = 0;
      while(1) {
        if (StreamingUnicode) {
          TempLine = ParseReturnStdInLine (FileHandle);
        } else {
          TempLine = ShellFileHandleReturnLine (FileHandle, &Ascii); 
        }
        if (TempLine == NULL
            || *TempLine == CHAR_NULL
            || StrStr (TempLine, L"ShellCommand,") == TempLine) {
          SHELL_FREE_NON_NULL(TempLine);
          break;
        }
        if (StrStr (TempLine, TableName) == TempLine) {
          LoopVariable++;
          if (LoopVariable == TableNameInstance
              || (TableNameInstance == (UINTN)-1)) {
            for (ColumnLoop = 1, ColumnPointer = TempLine; ColumnLoop < ColumnIndex && ColumnPointer != NULL && *ColumnPointer != CHAR_NULL; ColumnLoop++) {
              ColumnPointer = StrStr (ColumnPointer, L",\"");
              if (ColumnPointer != NULL && *ColumnPointer != CHAR_NULL){
                ColumnPointer++;
              }
            }
            if (ColumnLoop == ColumnIndex) {
              if (ColumnPointer == NULL) {
                ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_NO_VALUE), gShellLevel2HiiHandle, L"parse", L"Column Index");  
                ShellStatus = SHELL_INVALID_PARAMETER;
              } else {
                TempSpot = StrStr (ColumnPointer, L",\"");
                if (TempSpot != NULL) {
                  *TempSpot = CHAR_NULL;
                }
                while (ColumnPointer != NULL && *ColumnPointer != CHAR_NULL && ColumnPointer[0] == L' '){
                  ColumnPointer++;
                }
                if (ColumnPointer != NULL && *ColumnPointer != CHAR_NULL && ColumnPointer[0] == L'\"'){
                  ColumnPointer++;
                }
                if (ColumnPointer != NULL && *ColumnPointer != CHAR_NULL && ColumnPointer[StrLen (ColumnPointer) - 1] == L'\"'){
                  ColumnPointer[StrLen (ColumnPointer) - 1] = CHAR_NULL;
                }
                SfoString = HandleStringWithEscapeCharForParse (ColumnPointer);
                if (SfoString != NULL) {
                  ShellPrintEx (-1, -1, L"%s\r\n", SfoString);
                  SHELL_FREE_NON_NULL (SfoString);
                }
              }
            }
          }
        }
        SHELL_FREE_NON_NULL(TempLine);
      }
    }
  }
  return (ShellStatus);
}

STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
  {L"-i", TypeValue},
  {L"-s", TypeValue},
  {NULL, TypeMax}
  };

/**
  Function for 'parse' command.

  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
**/
SHELL_STATUS
EFIAPI
ShellCommandRunParse (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS          Status;
  LIST_ENTRY          *Package;
  CHAR16              *ProblemParam;
  CONST CHAR16        *FileName;
  CONST CHAR16        *TableName;
  CONST CHAR16        *ColumnString;
  SHELL_STATUS        ShellStatus;
  UINTN               ShellCommandInstance;
  UINTN               TableNameInstance;
  BOOLEAN             StreamingUnicode;

  ShellStatus      = SHELL_SUCCESS;
  ProblemParam     = NULL;
  StreamingUnicode = FALSE;

  //
  // initialize the shell lib (we must be in non-auto-init...)
  //
  Status = ShellInitialize();
  ASSERT_EFI_ERROR(Status);

  //
  // parse the command line
  //
  Status = ShellCommandLineParseEx (ParamList, &Package, &ProblemParam, TRUE, FALSE);
  if (EFI_ERROR(Status)) {
    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellLevel2HiiHandle, L"parse", ProblemParam);  
      FreePool(ProblemParam);
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      ASSERT(FALSE);
    }
  } else {
    StreamingUnicode = IsStdInDataAvailable ();
    if ((!StreamingUnicode && (ShellCommandLineGetCount(Package) < 4)) ||
        (ShellCommandLineGetCount(Package) < 3)) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel2HiiHandle, L"parse");  
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else if ((StreamingUnicode && (ShellCommandLineGetCount(Package) > 3)) ||
                (ShellCommandLineGetCount(Package) > 4)) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellLevel2HiiHandle, L"parse");  
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      if (StreamingUnicode) {
        FileName         = L">i";
        TableName        = ShellCommandLineGetRawValue(Package, 1);
        ColumnString     = ShellCommandLineGetRawValue(Package, 2);
      } else {
        FileName         = ShellCommandLineGetRawValue(Package, 1);
        TableName        = ShellCommandLineGetRawValue(Package, 2);
        ColumnString     = ShellCommandLineGetRawValue(Package, 3);
      }
      if (ShellCommandLineGetValue(Package, L"-i") == NULL) {
        TableNameInstance = (UINTN)-1;
      } else {
        TableNameInstance = ShellStrToUintn(ShellCommandLineGetValue(Package, L"-i"));
      }
      if (ShellCommandLineGetValue(Package, L"-s") == NULL) {
        ShellCommandInstance = 1;
      } else {
        ShellCommandInstance = ShellStrToUintn(ShellCommandLineGetValue(Package, L"-s"));
      }

      ShellStatus = PerformParsing(FileName, TableName, ShellStrToUintn(ColumnString), TableNameInstance, ShellCommandInstance, StreamingUnicode);
    }
  }

  //
  // free the command line package
  //
  ShellCommandLineFreeVarList (Package);

  return (ShellStatus);
}