Esempi in C++ (Cpp) per _yr_scan_wicompare

Esempio n. 1

File: scan.c Progetto: Cbrdiv/yara

int _yr_scan_verify_literal_match(
    YR_SCAN_CONTEXT* context,
    YR_AC_MATCH* ac_match,
    uint8_t* data,
    size_t data_size,
    size_t data_base,
    size_t offset)
{
  int flags = 0;
  int forward_matches = 0;

  CALLBACK_ARGS callback_args;
  YR_STRING* string = ac_match->string;

  if (STRING_FITS_IN_ATOM(string))
  {
    forward_matches = ac_match->backtrack;
  }
  else if (STRING_IS_NO_CASE(string))
  {
    if (STRING_IS_ASCII(string))
    {
      forward_matches = _yr_scan_icompare(
          data + offset,
          data_size - offset,
          string->string,
          string->length);
    }

    if (STRING_IS_WIDE(string) && forward_matches == 0)
    {
      forward_matches = _yr_scan_wicompare(
          data + offset,
          data_size - offset,
          string->string,
          string->length);
    }
  }
  else
  {
    if (STRING_IS_ASCII(string))
    {
      forward_matches = _yr_scan_compare(
          data + offset,
          data_size - offset,
          string->string,
          string->length);
    }

    if (STRING_IS_WIDE(string) && forward_matches == 0)
    {
      forward_matches = _yr_scan_wcompare(
          data + offset,
          data_size - offset,
          string->string,
          string->length);
    }
  }

  if (forward_matches == 0)
    return ERROR_SUCCESS;

  if (forward_matches == string->length * 2)
    flags |= RE_FLAGS_WIDE;

  if (STRING_IS_NO_CASE(string))
    flags |= RE_FLAGS_NO_CASE;

  callback_args.context = context;
  callback_args.string = string;
  callback_args.data = data;
  callback_args.data_size = data_size;
  callback_args.data_base = data_base;
  callback_args.forward_matches = forward_matches;
  callback_args.full_word = STRING_IS_FULL_WORD(string);

  FAIL_ON_ERROR(_yr_scan_match_callback(
      data + offset, 0, flags, &callback_args));

  return ERROR_SUCCESS;
}

Esempio n. 2

File: rules.c Progetto: dodng/yara

int _yr_scan_verify_literal_match(
    YR_AC_MATCH* ac_match,
    uint8_t* data,
    size_t data_size,
    size_t offset,
    YR_ARENA* matches_arena)
{
  int flags = 0;
  int forward_matches = 0;

  CALLBACK_ARGS callback_args;
  YR_STRING* string = ac_match->string;

  if (STRING_FITS_IN_ATOM(string))
  {
    if (STRING_IS_WIDE(string))
      forward_matches = string->length * 2;
    else
      forward_matches = string->length;
  }
  else if (STRING_IS_NO_CASE(string))
  {
    flags |= RE_FLAGS_NO_CASE;

    if (STRING_IS_ASCII(string))
    {
      forward_matches = _yr_scan_icompare(
          data + offset,
          data_size - offset,
          string->string,
          string->length);
    }

    if (STRING_IS_WIDE(string) && forward_matches == 0)
    {
      flags |= RE_FLAGS_WIDE;
      forward_matches = _yr_scan_wicompare(
          data + offset,
          data_size - offset,
          string->string,
          string->length);
    }
  }
  else
  {
    if (STRING_IS_ASCII(string))
    {
      forward_matches = _yr_scan_compare(
          data + offset,
          data_size - offset,
          string->string,
          string->length);
    }

    if (STRING_IS_WIDE(string) && forward_matches == 0)
    {
      flags |= RE_FLAGS_WIDE;
      forward_matches = _yr_scan_wcompare(
          data + offset,
          data_size - offset,
          string->string,
          string->length);
    }
  }

  if (forward_matches > 0)
  {
    if (STRING_IS_FULL_WORD(string))
    {
      if (flags & RE_FLAGS_WIDE)
      {
        if (offset >= 2 &&
            *(data + offset - 1) == 0 &&
            isalnum(*(data + offset - 2)))
          return ERROR_SUCCESS;

        if (offset + forward_matches + 1 < data_size &&
            *(data + offset + forward_matches + 1) == 0 &&
            isalnum(*(data + offset + forward_matches)))
          return ERROR_SUCCESS;
      }
      else
      {
        if (offset >= 1 &&
            isalnum(*(data + offset - 1)))
          return ERROR_SUCCESS;

        if (offset + forward_matches < data_size &&
            isalnum(*(data + offset + forward_matches)))
          return ERROR_SUCCESS;
      }
    }

    callback_args.string = string;
    callback_args.data = data;
    callback_args.data_size = data_size;
    callback_args.matches_arena = matches_arena;
    callback_args.forward_matches = forward_matches;
    callback_args.full_word = STRING_IS_FULL_WORD(string);
    callback_args.tidx = yr_get_tidx();

    FAIL_ON_ERROR(_yr_scan_match_callback(
        data + offset, 0, flags, &callback_args));
  }

  return ERROR_SUCCESS;
}