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audk/MdePkg/Library/BaseLib/String.c

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/** @file
Unicode and ASCII string primitives.
Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "BaseLibInternals.h"
/**
Returns the length of a Null-terminated Unicode string.
This function returns the number of Unicode characters in the Null-terminated
Unicode string specified by String.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@return The length of String.
**/
UINTN
EFIAPI
StrLen (
IN CONST CHAR16 *String
)
{
UINTN Length;
ASSERT (String != NULL);
ASSERT (((UINTN)String & BIT0) == 0);
for (Length = 0; *String != L'\0'; String++, Length++) {
//
// If PcdMaximumUnicodeStringLength is not zero,
// length should not more than PcdMaximumUnicodeStringLength
//
if (PcdGet32 (PcdMaximumUnicodeStringLength) != 0) {
ASSERT (Length < PcdGet32 (PcdMaximumUnicodeStringLength));
}
}
return Length;
}
/**
Returns the size of a Null-terminated Unicode string in bytes, including the
Null terminator.
This function returns the size, in bytes, of the Null-terminated Unicode string
specified by String.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@return The size of String.
**/
UINTN
EFIAPI
StrSize (
IN CONST CHAR16 *String
)
{
return (StrLen (String) + 1) * sizeof (*String);
}
/**
Compares two Null-terminated Unicode strings, and returns the difference
between the first mismatched Unicode characters.
This function compares the Null-terminated Unicode string FirstString to the
Null-terminated Unicode string SecondString. If FirstString is identical to
SecondString, then 0 is returned. Otherwise, the value returned is the first
mismatched Unicode character in SecondString subtracted from the first
mismatched Unicode character in FirstString.
If FirstString is NULL, then ASSERT().
If FirstString is not aligned on a 16-bit boundary, then ASSERT().
If SecondString is NULL, then ASSERT().
If SecondString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more
than PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more
than PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param FirstString A pointer to a Null-terminated Unicode string.
@param SecondString A pointer to a Null-terminated Unicode string.
@retval 0 FirstString is identical to SecondString.
@return others FirstString is not identical to SecondString.
**/
INTN
EFIAPI
StrCmp (
IN CONST CHAR16 *FirstString,
IN CONST CHAR16 *SecondString
)
{
//
// ASSERT both strings are less long than PcdMaximumUnicodeStringLength
//
ASSERT (StrSize (FirstString) != 0);
ASSERT (StrSize (SecondString) != 0);
while ((*FirstString != L'\0') && (*FirstString == *SecondString)) {
FirstString++;
SecondString++;
}
return *FirstString - *SecondString;
}
/**
Compares up to a specified length the contents of two Null-terminated Unicode strings,
and returns the difference between the first mismatched Unicode characters.
This function compares the Null-terminated Unicode string FirstString to the
Null-terminated Unicode string SecondString. At most, Length Unicode
characters will be compared. If Length is 0, then 0 is returned. If
FirstString is identical to SecondString, then 0 is returned. Otherwise, the
value returned is the first mismatched Unicode character in SecondString
subtracted from the first mismatched Unicode character in FirstString.
If Length > 0 and FirstString is NULL, then ASSERT().
If Length > 0 and FirstString is not aligned on a 16-bit boundary, then ASSERT().
If Length > 0 and SecondString is NULL, then ASSERT().
If Length > 0 and SecondString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Length is greater than
PcdMaximumUnicodeStringLength, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
@param FirstString A pointer to a Null-terminated Unicode string.
@param SecondString A pointer to a Null-terminated Unicode string.
@param Length The maximum number of Unicode characters to compare.
@retval 0 FirstString is identical to SecondString.
@return others FirstString is not identical to SecondString.
**/
INTN
EFIAPI
StrnCmp (
IN CONST CHAR16 *FirstString,
IN CONST CHAR16 *SecondString,
IN UINTN Length
)
{
if (Length == 0) {
return 0;
}
//
// ASSERT both strings are less long than PcdMaximumUnicodeStringLength.
// Length tests are performed inside StrLen().
//
ASSERT (StrSize (FirstString) != 0);
ASSERT (StrSize (SecondString) != 0);
if (PcdGet32 (PcdMaximumUnicodeStringLength) != 0) {
ASSERT (Length <= PcdGet32 (PcdMaximumUnicodeStringLength));
}
while ((*FirstString != L'\0') &&
(*SecondString != L'\0') &&
(*FirstString == *SecondString) &&
(Length > 1))
{
FirstString++;
SecondString++;
Length--;
}
return *FirstString - *SecondString;
}
/**
Returns the first occurrence of a Null-terminated Unicode sub-string
in a Null-terminated Unicode string.
This function scans the contents of the Null-terminated Unicode string
specified by String and returns the first occurrence of SearchString.
If SearchString is not found in String, then NULL is returned. If
the length of SearchString is zero, then String is
returned.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If SearchString is NULL, then ASSERT().
If SearchString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SearchString
or String contains more than PcdMaximumUnicodeStringLength Unicode
characters, not including the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@param SearchString A pointer to a Null-terminated Unicode string to search for.
@retval NULL If the SearchString does not appear in String.
@return others If there is a match.
**/
CHAR16 *
EFIAPI
StrStr (
IN CONST CHAR16 *String,
IN CONST CHAR16 *SearchString
)
{
CONST CHAR16 *FirstMatch;
CONST CHAR16 *SearchStringTmp;
//
// ASSERT both strings are less long than PcdMaximumUnicodeStringLength.
// Length tests are performed inside StrLen().
//
ASSERT (StrSize (String) != 0);
ASSERT (StrSize (SearchString) != 0);
if (*SearchString == L'\0') {
return (CHAR16 *)String;
}
while (*String != L'\0') {
SearchStringTmp = SearchString;
FirstMatch = String;
while ( (*String == *SearchStringTmp)
&& (*String != L'\0'))
{
String++;
SearchStringTmp++;
}
if (*SearchStringTmp == L'\0') {
return (CHAR16 *)FirstMatch;
}
if (*String == L'\0') {
return NULL;
}
String = FirstMatch + 1;
}
return NULL;
}
/**
Check if a Unicode character is a decimal character.
This internal function checks if a Unicode character is a
decimal character. The valid decimal character is from
L'0' to L'9'.
@param Char The character to check against.
@retval TRUE If the Char is a decmial character.
@retval FALSE If the Char is not a decmial character.
**/
BOOLEAN
EFIAPI
InternalIsDecimalDigitCharacter (
IN CHAR16 Char
)
{
return (BOOLEAN)(Char >= L'0' && Char <= L'9');
}
/**
Convert a Unicode character to upper case only if
it maps to a valid small-case ASCII character.
This internal function only deal with Unicode character
which maps to a valid small-case ASCII character, i.e.
L'a' to L'z'. For other Unicode character, the input character
is returned directly.
@param Char The character to convert.
@retval LowerCharacter If the Char is with range L'a' to L'z'.
@retval Unchanged Otherwise.
**/
CHAR16
EFIAPI
CharToUpper (
IN CHAR16 Char
)
{
if ((Char >= L'a') && (Char <= L'z')) {
return (CHAR16)(Char - (L'a' - L'A'));
}
return Char;
}
/**
Convert a Unicode character to numerical value.
This internal function only deal with Unicode character
which maps to a valid hexadecimal ASII character, i.e.
L'0' to L'9', L'a' to L'f' or L'A' to L'F'. For other
Unicode character, the value returned does not make sense.
@param Char The character to convert.
@return The numerical value converted.
**/
UINTN
EFIAPI
InternalHexCharToUintn (
IN CHAR16 Char
)
{
if (InternalIsDecimalDigitCharacter (Char)) {
return Char - L'0';
}
return (10 + CharToUpper (Char) - L'A');
}
/**
Check if a Unicode character is a hexadecimal character.
This internal function checks if a Unicode character is a
decimal character. The valid hexadecimal character is
L'0' to L'9', L'a' to L'f', or L'A' to L'F'.
@param Char The character to check against.
@retval TRUE If the Char is a hexadecmial character.
@retval FALSE If the Char is not a hexadecmial character.
**/
BOOLEAN
EFIAPI
InternalIsHexaDecimalDigitCharacter (
IN CHAR16 Char
)
{
return (BOOLEAN)(InternalIsDecimalDigitCharacter (Char) ||
(Char >= L'A' && Char <= L'F') ||
(Char >= L'a' && Char <= L'f'));
}
/**
Convert a Null-terminated Unicode decimal string to a value of
type UINTN.
This function returns a value of type UINTN by interpreting the contents
of the Unicode string specified by String as a decimal number. The format
of the input Unicode string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The
function will ignore the pad space, which includes spaces or
tab characters, before [decimal digits]. The running zero in the
beginning of [decimal digits] will be ignored. Then, the function
stops at the first character that is a not a valid decimal character
or a Null-terminator, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits,
then 0 is returned.
If the number represented by String overflows according
to the range defined by UINTN, then MAX_UINTN is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains
more than PcdMaximumUnicodeStringLength Unicode characters, not including
the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINTN
EFIAPI
StrDecimalToUintn (
IN CONST CHAR16 *String
)
{
UINTN Result;
StrDecimalToUintnS (String, (CHAR16 **)NULL, &Result);
return Result;
}
/**
Convert a Null-terminated Unicode decimal string to a value of
type UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the Unicode string specified by String as a decimal number. The format
of the input Unicode string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The
function will ignore the pad space, which includes spaces or
tab characters, before [decimal digits]. The running zero in the
beginning of [decimal digits] will be ignored. Then, the function
stops at the first character that is a not a valid decimal character
or a Null-terminator, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits,
then 0 is returned.
If the number represented by String overflows according
to the range defined by UINT64, then MAX_UINT64 is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains
more than PcdMaximumUnicodeStringLength Unicode characters, not including
the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINT64
EFIAPI
StrDecimalToUint64 (
IN CONST CHAR16 *String
)
{
UINT64 Result;
StrDecimalToUint64S (String, (CHAR16 **)NULL, &Result);
return Result;
}
/**
Convert a Null-terminated Unicode hexadecimal string to a value of type UINTN.
This function returns a value of type UINTN by interpreting the contents
of the Unicode string specified by String as a hexadecimal number.
The format of the input Unicode string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
If "x" appears in the input string, it must be prefixed with at least one 0.
The function will ignore the pad space, which includes spaces or tab characters,
before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or
[hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the
first valid hexadecimal digit. Then, the function stops at the first character that is
a not a valid hexadecimal character or NULL, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then zero is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits,
then zero is returned.
If the number represented by String overflows according to the range defined by
UINTN, then MAX_UINTN is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINTN
EFIAPI
StrHexToUintn (
IN CONST CHAR16 *String
)
{
UINTN Result;
StrHexToUintnS (String, (CHAR16 **)NULL, &Result);
return Result;
}
/**
Convert a Null-terminated Unicode hexadecimal string to a value of type UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the Unicode string specified by String as a hexadecimal number.
The format of the input Unicode string String is
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
If "x" appears in the input string, it must be prefixed with at least one 0.
The function will ignore the pad space, which includes spaces or tab characters,
before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or
[hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the
first valid hexadecimal digit. Then, the function stops at the first character that is
a not a valid hexadecimal character or NULL, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then zero is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits,
then zero is returned.
If the number represented by String overflows according to the range defined by
UINT64, then MAX_UINT64 is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINT64
EFIAPI
StrHexToUint64 (
IN CONST CHAR16 *String
)
{
UINT64 Result;
StrHexToUint64S (String, (CHAR16 **)NULL, &Result);
return Result;
}
/**
Check if a ASCII character is a decimal character.
This internal function checks if a Unicode character is a
decimal character. The valid decimal character is from
'0' to '9'.
@param Char The character to check against.
@retval TRUE If the Char is a decmial character.
@retval FALSE If the Char is not a decmial character.
**/
BOOLEAN
EFIAPI
InternalAsciiIsDecimalDigitCharacter (
IN CHAR8 Char
)
{
return (BOOLEAN)(Char >= '0' && Char <= '9');
}
/**
Check if a ASCII character is a hexadecimal character.
This internal function checks if a ASCII character is a
decimal character. The valid hexadecimal character is
L'0' to L'9', L'a' to L'f', or L'A' to L'F'.
@param Char The character to check against.
@retval TRUE If the Char is a hexadecmial character.
@retval FALSE If the Char is not a hexadecmial character.
**/
BOOLEAN
EFIAPI
InternalAsciiIsHexaDecimalDigitCharacter (
IN CHAR8 Char
)
{
return (BOOLEAN)(InternalAsciiIsDecimalDigitCharacter (Char) ||
(Char >= 'A' && Char <= 'F') ||
(Char >= 'a' && Char <= 'f'));
}
/**
Returns the length of a Null-terminated ASCII string.
This function returns the number of ASCII characters in the Null-terminated
ASCII string specified by String.
If Length > 0 and Destination is NULL, then ASSERT().
If Length > 0 and Source is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and String contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@return The length of String.
**/
UINTN
EFIAPI
AsciiStrLen (
IN CONST CHAR8 *String
)
{
UINTN Length;
ASSERT (String != NULL);
for (Length = 0; *String != '\0'; String++, Length++) {
//
// If PcdMaximumUnicodeStringLength is not zero,
// length should not more than PcdMaximumUnicodeStringLength
//
if (PcdGet32 (PcdMaximumAsciiStringLength) != 0) {
ASSERT (Length < PcdGet32 (PcdMaximumAsciiStringLength));
}
}
return Length;
}
/**
Returns the size of a Null-terminated ASCII string in bytes, including the
Null terminator.
This function returns the size, in bytes, of the Null-terminated ASCII string
specified by String.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and String contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@return The size of String.
**/
UINTN
EFIAPI
AsciiStrSize (
IN CONST CHAR8 *String
)
{
return (AsciiStrLen (String) + 1) * sizeof (*String);
}
/**
Compares two Null-terminated ASCII strings, and returns the difference
between the first mismatched ASCII characters.
This function compares the Null-terminated ASCII string FirstString to the
Null-terminated ASCII string SecondString. If FirstString is identical to
SecondString, then 0 is returned. Otherwise, the value returned is the first
mismatched ASCII character in SecondString subtracted from the first
mismatched ASCII character in FirstString.
If FirstString is NULL, then ASSERT().
If SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero and SecondString contains more
than PcdMaximumAsciiStringLength ASCII characters, not including the
Null-terminator, then ASSERT().
@param FirstString A pointer to a Null-terminated ASCII string.
@param SecondString A pointer to a Null-terminated ASCII string.
@retval ==0 FirstString is identical to SecondString.
@retval !=0 FirstString is not identical to SecondString.
**/
INTN
EFIAPI
AsciiStrCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString
)
{
//
// ASSERT both strings are less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (FirstString));
ASSERT (AsciiStrSize (SecondString));
while ((*FirstString != '\0') && (*FirstString == *SecondString)) {
FirstString++;
SecondString++;
}
return *FirstString - *SecondString;
}
/**
Converts a lowercase Ascii character to upper one.
If Chr is lowercase Ascii character, then converts it to upper one.
If Value >= 0xA0, then ASSERT().
If (Value & 0x0F) >= 0x0A, then ASSERT().
@param Chr one Ascii character
@return The uppercase value of Ascii character
**/
CHAR8
EFIAPI
AsciiCharToUpper (
IN CHAR8 Chr
)
{
return (UINT8)((Chr >= 'a' && Chr <= 'z') ? Chr - ('a' - 'A') : Chr);
}
/**
Convert a ASCII character to numerical value.
This internal function only deal with Unicode character
which maps to a valid hexadecimal ASII character, i.e.
'0' to '9', 'a' to 'f' or 'A' to 'F'. For other
ASCII character, the value returned does not make sense.
@param Char The character to convert.
@return The numerical value converted.
**/
UINTN
EFIAPI
InternalAsciiHexCharToUintn (
IN CHAR8 Char
)
{
if (InternalIsDecimalDigitCharacter (Char)) {
return Char - '0';
}
return (10 + AsciiCharToUpper (Char) - 'A');
}
/**
Performs a case insensitive comparison of two Null-terminated ASCII strings,
and returns the difference between the first mismatched ASCII characters.
This function performs a case insensitive comparison of the Null-terminated
ASCII string FirstString to the Null-terminated ASCII string SecondString. If
FirstString is identical to SecondString, then 0 is returned. Otherwise, the
value returned is the first mismatched lower case ASCII character in
SecondString subtracted from the first mismatched lower case ASCII character
in FirstString.
If FirstString is NULL, then ASSERT().
If SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero and SecondString contains more
than PcdMaximumAsciiStringLength ASCII characters, not including the
Null-terminator, then ASSERT().
@param FirstString A pointer to a Null-terminated ASCII string.
@param SecondString A pointer to a Null-terminated ASCII string.
@retval ==0 FirstString is identical to SecondString using case insensitive
comparisons.
@retval !=0 FirstString is not identical to SecondString using case
insensitive comparisons.
**/
INTN
EFIAPI
AsciiStriCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString
)
{
CHAR8 UpperFirstString;
CHAR8 UpperSecondString;
//
// ASSERT both strings are less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (FirstString));
ASSERT (AsciiStrSize (SecondString));
UpperFirstString = AsciiCharToUpper (*FirstString);
UpperSecondString = AsciiCharToUpper (*SecondString);
while ((*FirstString != '\0') && (*SecondString != '\0') && (UpperFirstString == UpperSecondString)) {
FirstString++;
SecondString++;
UpperFirstString = AsciiCharToUpper (*FirstString);
UpperSecondString = AsciiCharToUpper (*SecondString);
}
return UpperFirstString - UpperSecondString;
}
/**
Compares two Null-terminated ASCII strings with maximum lengths, and returns
the difference between the first mismatched ASCII characters.
This function compares the Null-terminated ASCII string FirstString to the
Null-terminated ASCII string SecondString. At most, Length ASCII characters
will be compared. If Length is 0, then 0 is returned. If FirstString is
identical to SecondString, then 0 is returned. Otherwise, the value returned
is the first mismatched ASCII character in SecondString subtracted from the
first mismatched ASCII character in FirstString.
If Length > 0 and FirstString is NULL, then ASSERT().
If Length > 0 and SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Length is greater than
PcdMaximumAsciiStringLength, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and SecondString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param FirstString A pointer to a Null-terminated ASCII string.
@param SecondString A pointer to a Null-terminated ASCII string.
@param Length The maximum number of ASCII characters for compare.
@retval ==0 FirstString is identical to SecondString.
@retval !=0 FirstString is not identical to SecondString.
**/
INTN
EFIAPI
AsciiStrnCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString,
IN UINTN Length
)
{
if (Length == 0) {
return 0;
}
//
// ASSERT both strings are less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (FirstString));
ASSERT (AsciiStrSize (SecondString));
if (PcdGet32 (PcdMaximumAsciiStringLength) != 0) {
ASSERT (Length <= PcdGet32 (PcdMaximumAsciiStringLength));
}
while ((*FirstString != '\0') &&
(*SecondString != '\0') &&
(*FirstString == *SecondString) &&
(Length > 1))
{
FirstString++;
SecondString++;
Length--;
}
return *FirstString - *SecondString;
}
/**
Returns the first occurrence of a Null-terminated ASCII sub-string
in a Null-terminated ASCII string.
This function scans the contents of the ASCII string specified by String
and returns the first occurrence of SearchString. If SearchString is not
found in String, then NULL is returned. If the length of SearchString is zero,
then String is returned.
If String is NULL, then ASSERT().
If SearchString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and SearchString or
String contains more than PcdMaximumAsciiStringLength Unicode characters
not including the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@param SearchString A pointer to a Null-terminated ASCII string to search for.
@retval NULL If the SearchString does not appear in String.
@retval others If there is a match return the first occurrence of SearchingString.
If the length of SearchString is zero,return String.
**/
CHAR8 *
EFIAPI
AsciiStrStr (
IN CONST CHAR8 *String,
IN CONST CHAR8 *SearchString
)
{
CONST CHAR8 *FirstMatch;
CONST CHAR8 *SearchStringTmp;
//
// ASSERT both strings are less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (String) != 0);
ASSERT (AsciiStrSize (SearchString) != 0);
if (*SearchString == '\0') {
return (CHAR8 *)String;
}
while (*String != '\0') {
SearchStringTmp = SearchString;
FirstMatch = String;
while ( (*String == *SearchStringTmp)
&& (*String != '\0'))
{
String++;
SearchStringTmp++;
}
if (*SearchStringTmp == '\0') {
return (CHAR8 *)FirstMatch;
}
if (*String == '\0') {
return NULL;
}
String = FirstMatch + 1;
}
return NULL;
}
/**
Convert a Null-terminated ASCII decimal string to a value of type
UINTN.
This function returns a value of type UINTN by interpreting the contents
of the ASCII string String as a decimal number. The format of the input
ASCII string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before the digits.
The running zero in the beginning of [decimal digits] will be ignored. Then, the
function stops at the first character that is a not a valid decimal character or
Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits, then 0 is returned.
If the number represented by String overflows according to the range defined by
UINTN, then MAX_UINTN is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and String contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINTN
EFIAPI
AsciiStrDecimalToUintn (
IN CONST CHAR8 *String
)
{
UINTN Result;
AsciiStrDecimalToUintnS (String, (CHAR8 **)NULL, &Result);
return Result;
}
/**
Convert a Null-terminated ASCII decimal string to a value of type
UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the ASCII string String as a decimal number. The format of the input
ASCII string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before the digits.
The running zero in the beginning of [decimal digits] will be ignored. Then, the
function stops at the first character that is a not a valid decimal character or
Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits, then 0 is returned.
If the number represented by String overflows according to the range defined by
UINT64, then MAX_UINT64 is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and String contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINT64
EFIAPI
AsciiStrDecimalToUint64 (
IN CONST CHAR8 *String
)
{
UINT64 Result;
AsciiStrDecimalToUint64S (String, (CHAR8 **)NULL, &Result);
return Result;
}
/**
Convert a Null-terminated ASCII hexadecimal string to a value of type UINTN.
This function returns a value of type UINTN by interpreting the contents of
the ASCII string String as a hexadecimal number. The format of the input ASCII
string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x"
appears in the input string, it must be prefixed with at least one 0. The function
will ignore the pad space, which includes spaces or tab characters, before [zeros],
[x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits]
will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal
digit. Then, the function stops at the first character that is a not a valid
hexadecimal character or Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then
0 is returned.
If the number represented by String overflows according to the range defined by UINTN,
then MAX_UINTN is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero,
and String contains more than PcdMaximumAsciiStringLength ASCII characters not including
the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINTN
EFIAPI
AsciiStrHexToUintn (
IN CONST CHAR8 *String
)
{
UINTN Result;
AsciiStrHexToUintnS (String, (CHAR8 **)NULL, &Result);
return Result;
}
/**
Convert a Null-terminated ASCII hexadecimal string to a value of type UINT64.
This function returns a value of type UINT64 by interpreting the contents of
the ASCII string String as a hexadecimal number. The format of the input ASCII
string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x"
appears in the input string, it must be prefixed with at least one 0. The function
will ignore the pad space, which includes spaces or tab characters, before [zeros],
[x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits]
will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal
digit. Then, the function stops at the first character that is a not a valid
hexadecimal character or Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then
0 is returned.
If the number represented by String overflows according to the range defined by UINT64,
then MAX_UINT64 is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero,
and String contains more than PcdMaximumAsciiStringLength ASCII characters not including
the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINT64
EFIAPI
AsciiStrHexToUint64 (
IN CONST CHAR8 *String
)
{
UINT64 Result;
AsciiStrHexToUint64S (String, (CHAR8 **)NULL, &Result);
return Result;
}
STATIC CHAR8 EncodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
/**
Convert binary data to a Base64 encoded ascii string based on RFC4648.
Produce a Null-terminated Ascii string in the output buffer specified by Destination and DestinationSize.
The Ascii string is produced by converting the data string specified by Source and SourceLength.
@param Source Input UINT8 data
@param SourceLength Number of UINT8 bytes of data
@param Destination Pointer to output string buffer
@param DestinationSize Size of ascii buffer. Set to 0 to get the size needed.
Caller is responsible for passing in buffer of DestinationSize
@retval RETURN_SUCCESS When ascii buffer is filled in.
@retval RETURN_INVALID_PARAMETER If Source is NULL or DestinationSize is NULL.
@retval RETURN_INVALID_PARAMETER If SourceLength or DestinationSize is bigger than (MAX_ADDRESS - (UINTN)Destination).
@retval RETURN_BUFFER_TOO_SMALL If SourceLength is 0 and DestinationSize is <1.
@retval RETURN_BUFFER_TOO_SMALL If Destination is NULL or DestinationSize is smaller than required buffersize.
**/
RETURN_STATUS
EFIAPI
Base64Encode (
IN CONST UINT8 *Source,
IN UINTN SourceLength,
OUT CHAR8 *Destination OPTIONAL,
IN OUT UINTN *DestinationSize
)
{
UINTN RequiredSize;
UINTN Left;
//
// Check pointers, and SourceLength is valid
//
if ((Source == NULL) || (DestinationSize == NULL)) {
return RETURN_INVALID_PARAMETER;
}
//
// Allow for RFC 4648 test vector 1
//
if (SourceLength == 0) {
if (*DestinationSize < 1) {
*DestinationSize = 1;
return RETURN_BUFFER_TOO_SMALL;
}
*DestinationSize = 1;
*Destination = '\0';
return RETURN_SUCCESS;
}
//
// Check if SourceLength or DestinationSize is valid
//
if ((SourceLength >= (MAX_ADDRESS - (UINTN)Source)) || (*DestinationSize >= (MAX_ADDRESS - (UINTN)Destination))) {
return RETURN_INVALID_PARAMETER;
}
//
// 4 ascii per 3 bytes + NULL
//
RequiredSize = ((SourceLength + 2) / 3) * 4 + 1;
if ((Destination == NULL) || (*DestinationSize < RequiredSize)) {
*DestinationSize = RequiredSize;
return RETURN_BUFFER_TOO_SMALL;
}
Left = SourceLength;
//
// Encode 24 bits (three bytes) into 4 ascii characters
//
while (Left >= 3) {
*Destination++ = EncodingTable[(Source[0] & 0xfc) >> 2];
*Destination++ = EncodingTable[((Source[0] & 0x03) << 4) + ((Source[1] & 0xf0) >> 4)];
*Destination++ = EncodingTable[((Source[1] & 0x0f) << 2) + ((Source[2] & 0xc0) >> 6)];
*Destination++ = EncodingTable[(Source[2] & 0x3f)];
Left -= 3;
Source += 3;
}
//
// Handle the remainder, and add padding '=' characters as necessary.
//
switch (Left) {
case 0:
//
// No bytes Left, done.
//
break;
case 1:
//
// One more data byte, two pad characters
//
*Destination++ = EncodingTable[(Source[0] & 0xfc) >> 2];
*Destination++ = EncodingTable[((Source[0] & 0x03) << 4)];
*Destination++ = '=';
*Destination++ = '=';
break;
case 2:
//
// Two more data bytes, and one pad character
//
*Destination++ = EncodingTable[(Source[0] & 0xfc) >> 2];
*Destination++ = EncodingTable[((Source[0] & 0x03) << 4) + ((Source[1] & 0xf0) >> 4)];
*Destination++ = EncodingTable[((Source[1] & 0x0f) << 2)];
*Destination++ = '=';
break;
}
//
// Add terminating NULL
//
*Destination = '\0';
return RETURN_SUCCESS;
}
/**
Decode Base64 ASCII encoded data to 8-bit binary representation, based on
RFC4648.
Decoding occurs according to "Table 1: The Base 64 Alphabet" in RFC4648.
Whitespace is ignored at all positions:
- 0x09 ('\t') horizontal tab
- 0x0A ('\n') new line
- 0x0B ('\v') vertical tab
- 0x0C ('\f') form feed
- 0x0D ('\r') carriage return
- 0x20 (' ') space
The minimum amount of required padding (with ASCII 0x3D, '=') is tolerated
and enforced at the end of the Base64 ASCII encoded data, and only there.
Other characters outside of the encoding alphabet cause the function to
reject the Base64 ASCII encoded data.
@param[in] Source Array of CHAR8 elements containing the Base64
ASCII encoding. May be NULL if SourceSize is
zero.
@param[in] SourceSize Number of CHAR8 elements in Source.
@param[out] Destination Array of UINT8 elements receiving the decoded
8-bit binary representation. Allocated by the
caller. May be NULL if DestinationSize is
zero on input. If NULL, decoding is
performed, but the 8-bit binary
representation is not stored. If non-NULL and
the function returns an error, the contents
of Destination are indeterminate.
@param[in,out] DestinationSize On input, the number of UINT8 elements that
the caller allocated for Destination. On
output, if the function returns
RETURN_SUCCESS or RETURN_BUFFER_TOO_SMALL,
the number of UINT8 elements that are
required for decoding the Base64 ASCII
representation. If the function returns a
value different from both RETURN_SUCCESS and
RETURN_BUFFER_TOO_SMALL, then DestinationSize
is indeterminate on output.
@retval RETURN_SUCCESS SourceSize CHAR8 elements at Source have
been decoded to on-output DestinationSize
UINT8 elements at Destination. Note that
RETURN_SUCCESS covers the case when
DestinationSize is zero on input, and
Source decodes to zero bytes (due to
containing at most ignored whitespace).
@retval RETURN_BUFFER_TOO_SMALL The input value of DestinationSize is not
large enough for decoding SourceSize CHAR8
elements at Source. The required number of
UINT8 elements has been stored to
DestinationSize.
@retval RETURN_INVALID_PARAMETER DestinationSize is NULL.
@retval RETURN_INVALID_PARAMETER Source is NULL, but SourceSize is not zero.
@retval RETURN_INVALID_PARAMETER Destination is NULL, but DestinationSize is
not zero on input.
@retval RETURN_INVALID_PARAMETER Source is non-NULL, and (Source +
SourceSize) would wrap around MAX_ADDRESS.
@retval RETURN_INVALID_PARAMETER Destination is non-NULL, and (Destination +
DestinationSize) would wrap around
MAX_ADDRESS, as specified on input.
@retval RETURN_INVALID_PARAMETER None of Source and Destination are NULL,
and CHAR8[SourceSize] at Source overlaps
UINT8[DestinationSize] at Destination, as
specified on input.
@retval RETURN_INVALID_PARAMETER Invalid CHAR8 element encountered in
Source.
**/
RETURN_STATUS
EFIAPI
Base64Decode (
IN CONST CHAR8 *Source OPTIONAL,
IN UINTN SourceSize,
OUT UINT8 *Destination OPTIONAL,
IN OUT UINTN *DestinationSize
)
{
BOOLEAN PaddingMode;
UINTN SixBitGroupsConsumed;
UINT32 Accumulator;
UINTN OriginalDestinationSize;
UINTN SourceIndex;
CHAR8 SourceChar;
UINT32 Base64Value;
UINT8 DestinationOctet;
if (DestinationSize == NULL) {
return RETURN_INVALID_PARAMETER;
}
//
// Check Source array validity.
//
if (Source == NULL) {
if (SourceSize > 0) {
//
// At least one CHAR8 element at NULL Source.
//
return RETURN_INVALID_PARAMETER;
}
} else if (SourceSize > MAX_ADDRESS - (UINTN)Source) {
//
// Non-NULL Source, but it wraps around.
//
return RETURN_INVALID_PARAMETER;
}
//
// Check Destination array validity.
//
if (Destination == NULL) {
if (*DestinationSize > 0) {
//
// At least one UINT8 element at NULL Destination.
//
return RETURN_INVALID_PARAMETER;
}
} else if (*DestinationSize > MAX_ADDRESS - (UINTN)Destination) {
//
// Non-NULL Destination, but it wraps around.
//
return RETURN_INVALID_PARAMETER;
}
//
// Check for overlap.
//
if ((Source != NULL) && (Destination != NULL)) {
//
// Both arrays have been provided, and we know from earlier that each array
// is valid in itself.
//
if ((UINTN)Source + SourceSize <= (UINTN)Destination) {
//
// Source array precedes Destination array, OK.
//
} else if ((UINTN)Destination + *DestinationSize <= (UINTN)Source) {
//
// Destination array precedes Source array, OK.
//
} else {
//
// Overlap.
//
return RETURN_INVALID_PARAMETER;
}
}
//
// Decoding loop setup.
//
PaddingMode = FALSE;
SixBitGroupsConsumed = 0;
Accumulator = 0;
OriginalDestinationSize = *DestinationSize;
*DestinationSize = 0;
//
// Decoding loop.
//
for (SourceIndex = 0; SourceIndex < SourceSize; SourceIndex++) {
SourceChar = Source[SourceIndex];
//
// Whitespace is ignored at all positions (regardless of padding mode).
//
if ((SourceChar == '\t') || (SourceChar == '\n') || (SourceChar == '\v') ||
(SourceChar == '\f') || (SourceChar == '\r') || (SourceChar == ' '))
{
continue;
}
//
// If we're in padding mode, accept another padding character, as long as
// that padding character completes the quantum. This completes case (2)
// from RFC4648, Chapter 4. "Base 64 Encoding":
//
// (2) The final quantum of encoding input is exactly 8 bits; here, the
// final unit of encoded output will be two characters followed by two
// "=" padding characters.
//
if (PaddingMode) {
if ((SourceChar == '=') && (SixBitGroupsConsumed == 3)) {
SixBitGroupsConsumed = 0;
continue;
}
return RETURN_INVALID_PARAMETER;
}
//
// When not in padding mode, decode Base64Value based on RFC4648, "Table 1:
// The Base 64 Alphabet".
//
if (('A' <= SourceChar) && (SourceChar <= 'Z')) {
Base64Value = SourceChar - 'A';
} else if (('a' <= SourceChar) && (SourceChar <= 'z')) {
Base64Value = 26 + (SourceChar - 'a');
} else if (('0' <= SourceChar) && (SourceChar <= '9')) {
Base64Value = 52 + (SourceChar - '0');
} else if (SourceChar == '+') {
Base64Value = 62;
} else if (SourceChar == '/') {
Base64Value = 63;
} else if (SourceChar == '=') {
//
// Enter padding mode.
//
PaddingMode = TRUE;
if (SixBitGroupsConsumed == 2) {
//
// If we have consumed two 6-bit groups from the current quantum before
// encountering the first padding character, then this is case (2) from
// RFC4648, Chapter 4. "Base 64 Encoding". Bump SixBitGroupsConsumed,
// and we'll enforce another padding character.
//
SixBitGroupsConsumed = 3;
} else if (SixBitGroupsConsumed == 3) {
//
// If we have consumed three 6-bit groups from the current quantum
// before encountering the first padding character, then this is case
// (3) from RFC4648, Chapter 4. "Base 64 Encoding". The quantum is now
// complete.
//
SixBitGroupsConsumed = 0;
} else {
//
// Padding characters are not allowed at the first two positions of a
// quantum.
//
return RETURN_INVALID_PARAMETER;
}
//
// Wherever in a quantum we enter padding mode, we enforce the padding
// bits pending in the accumulator -- from the last 6-bit group just
// preceding the padding character -- to be zero. Refer to RFC4648,
// Chapter 3.5. "Canonical Encoding".
//
if (Accumulator != 0) {
return RETURN_INVALID_PARAMETER;
}
//
// Advance to the next source character.
//
continue;
} else {
//
// Other characters outside of the encoding alphabet are rejected.
//
return RETURN_INVALID_PARAMETER;
}
//
// Feed the bits of the current 6-bit group of the quantum to the
// accumulator.
//
Accumulator = (Accumulator << 6) | Base64Value;
SixBitGroupsConsumed++;
switch (SixBitGroupsConsumed) {
case 1:
//
// No octet to spill after consuming the first 6-bit group of the
// quantum; advance to the next source character.
//
continue;
case 2:
//
// 12 bits accumulated (6 pending + 6 new); prepare for spilling an
// octet. 4 bits remain pending.
//
DestinationOctet = (UINT8)(Accumulator >> 4);
Accumulator &= 0xF;
break;
case 3:
//
// 10 bits accumulated (4 pending + 6 new); prepare for spilling an
// octet. 2 bits remain pending.
//
DestinationOctet = (UINT8)(Accumulator >> 2);
Accumulator &= 0x3;
break;
default:
ASSERT (SixBitGroupsConsumed == 4);
//
// 8 bits accumulated (2 pending + 6 new); prepare for spilling an octet.
// The quantum is complete, 0 bits remain pending.
//
DestinationOctet = (UINT8)Accumulator;
Accumulator = 0;
SixBitGroupsConsumed = 0;
break;
}
//
// Store the decoded octet if there's room left. Increment
// (*DestinationSize) unconditionally.
//
if (*DestinationSize < OriginalDestinationSize) {
ASSERT (Destination != NULL);
Destination[*DestinationSize] = DestinationOctet;
}
(*DestinationSize)++;
//
// Advance to the next source character.
//
}
//
// If Source terminates mid-quantum, then Source is invalid.
//
if (SixBitGroupsConsumed != 0) {
return RETURN_INVALID_PARAMETER;
}
//
// Done.
//
if (*DestinationSize <= OriginalDestinationSize) {
return RETURN_SUCCESS;
}
return RETURN_BUFFER_TOO_SMALL;
}
/**
Converts an 8-bit value to an 8-bit BCD value.
Converts the 8-bit value specified by Value to BCD. The BCD value is
returned.
If Value >= 100, then ASSERT().
@param Value The 8-bit value to convert to BCD. Range 0..99.
@return The BCD value.
**/
UINT8
EFIAPI
DecimalToBcd8 (
IN UINT8 Value
)
{
ASSERT (Value < 100);
return (UINT8)(((Value / 10) << 4) | (Value % 10));
}
/**
Converts an 8-bit BCD value to an 8-bit value.
Converts the 8-bit BCD value specified by Value to an 8-bit value. The 8-bit
value is returned.
If Value >= 0xA0, then ASSERT().
If (Value & 0x0F) >= 0x0A, then ASSERT().
@param Value The 8-bit BCD value to convert to an 8-bit value.
@return The 8-bit value is returned.
**/
UINT8
EFIAPI
BcdToDecimal8 (
IN UINT8 Value
)
{
ASSERT (Value < 0xa0);
ASSERT ((Value & 0xf) < 0xa);
return (UINT8)((Value >> 4) * 10 + (Value & 0xf));
}
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