mDNSlocal mDNSu8 *ConvertDigest(char *digest, int digestType, int *diglen)
{
int i, j;
mDNSu8 *dig;
switch (digestType)
{
case SHA1_DIGEST_TYPE:
*diglen = CC_SHA1_DIGEST_LENGTH;
break;
case SHA256_DIGEST_TYPE:
*diglen = CC_SHA256_DIGEST_LENGTH;
break;
default:
LogMsg("ConvertDigest: digest type %d not supported", digestType);
return mDNSNULL;
}
dig = mDNSPlatformMemAllocate(*diglen);
if (!dig)
{
LogMsg("ConvertDigest: malloc failure");
return mDNSNULL;
}
for (j=0,i=0; i<*diglen*2; i+=2)
{
int l, h;
l = HexVal(digest[i]);
h = HexVal(digest[i+1]);
if (l<0 || h<0) { LogMsg("ConvertDigest: Cannot convert digest"); return NULL;}
dig[j++] = (mDNSu8)((l << 4) | h);
}
return dig;
}
static void NumericConst (void)
/* Parse a numeric constant */
{
unsigned Base; /* Temporary number base */
unsigned Prefix; /* Base according to prefix */
StrBuf S = STATIC_STRBUF_INITIALIZER;
int IsFloat;
char C;
unsigned DigitVal;
unsigned long IVal; /* Value */
/* Check for a leading hex or octal prefix and determine the possible
** integer types.
*/
if (CurC == '0') {
/* Gobble 0 and examine next char */
NextChar ();
if (toupper (CurC) == 'X') {
Base = Prefix = 16;
NextChar (); /* gobble "x" */
} else {
Base = 10; /* Assume 10 for now - see below */
Prefix = 8; /* Actual prefix says octal */
}
} else {
Base = Prefix = 10;
}
/* Because floating point numbers don't have octal prefixes (a number
** with a leading zero is decimal), we first have to read the number
** before converting it, so we can determine if it's a float or an
** integer.
*/
while (IsXDigit (CurC) && HexVal (CurC) < Base) {
SB_AppendChar (&S, CurC);
NextChar ();
}
SB_Terminate (&S);
/* The following character tells us if we have an integer or floating
** point constant. Note: Hexadecimal floating point constants aren't
** supported in C89.
*/
IsFloat = (CurC == '.' ||
(Base == 10 && toupper (CurC) == 'E') ||
(Base == 16 && toupper (CurC) == 'P' && IS_Get (&Standard) >= STD_C99));
/* If we don't have a floating point type, an octal prefix results in an
** octal base.
*/
if (!IsFloat && Prefix == 8) {
Base = 8;
}
/* Since we do now know the correct base, convert the remembered input
** into a number.
*/
SB_Reset (&S);
IVal = 0;
while ((C = SB_Get (&S)) != '\0') {
DigitVal = HexVal (C);
if (DigitVal >= Base) {
Error ("Numeric constant contains digits beyond the radix");
}
IVal = (IVal * Base) + DigitVal;
}
/* We don't need the string buffer any longer */
SB_Done (&S);
/* Distinguish between integer and floating point constants */
if (!IsFloat) {
unsigned Types;
int HaveSuffix;
/* Check for a suffix and determine the possible types */
HaveSuffix = 1;
if (toupper (CurC) == 'U') {
/* Unsigned type */
NextChar ();
if (toupper (CurC) != 'L') {
Types = IT_UINT | IT_ULONG;
} else {
NextChar ();
Types = IT_ULONG;
}
} else if (toupper (CurC) == 'L') {
/* Long type */
NextChar ();
if (toupper (CurC) != 'U') {
Types = IT_LONG | IT_ULONG;
} else {
NextChar ();
Types = IT_ULONG;
}
} else {
HaveSuffix = 0;
if (Prefix == 10) {
/* Decimal constants are of any type but uint */
Types = IT_INT | IT_LONG | IT_ULONG;
} else {
/* Octal or hex constants are of any type */
Types = IT_INT | IT_UINT | IT_LONG | IT_ULONG;
}
}
/* Check the range to determine the type */
if (IVal > 0x7FFF) {
/* Out of range for int */
Types &= ~IT_INT;
/* If the value is in the range 0x8000..0xFFFF, unsigned int is not
** allowed, and we don't have a type specifying suffix, emit a
** warning, because the constant is of type long.
*/
if (IVal <= 0xFFFF && (Types & IT_UINT) == 0 && !HaveSuffix) {
Warning ("Constant is long");
}
}
if (IVal > 0xFFFF) {
/* Out of range for unsigned int */
Types &= ~IT_UINT;
}
if (IVal > 0x7FFFFFFF) {
/* Out of range for long int */
Types &= ~IT_LONG;
}
/* Now set the type string to the smallest type in types */
if (Types & IT_INT) {
NextTok.Type = type_int;
} else if (Types & IT_UINT) {
NextTok.Type = type_uint;
} else if (Types & IT_LONG) {
NextTok.Type = type_long;
} else {
NextTok.Type = type_ulong;
}
/* Set the value and the token */
NextTok.IVal = IVal;
NextTok.Tok = TOK_ICONST;
} else {
/* Float constant */
Double FVal = FP_D_FromInt (IVal); /* Convert to double */
/* Check for a fractional part and read it */
if (CurC == '.') {
Double Scale;
/* Skip the dot */
NextChar ();
/* Read fractional digits */
Scale = FP_D_Make (1.0);
while (IsXDigit (CurC) && (DigitVal = HexVal (CurC)) < Base) {
/* Get the value of this digit */
Double FracVal = FP_D_Div (FP_D_FromInt (DigitVal * Base), Scale);
/* Add it to the float value */
FVal = FP_D_Add (FVal, FracVal);
/* Scale base */
Scale = FP_D_Mul (Scale, FP_D_FromInt (DigitVal));
/* Skip the digit */
NextChar ();
}
}
/* Check for an exponent and read it */
if ((Base == 16 && toupper (CurC) == 'F') ||
(Base == 10 && toupper (CurC) == 'E')) {
unsigned Digits;
unsigned Exp;
/* Skip the exponent notifier */
NextChar ();
/* Read an optional sign */
if (CurC == '-') {
NextChar ();
} else if (CurC == '+') {
NextChar ();
}
/* Read exponent digits. Since we support only 32 bit floats
** with a maximum exponent of +-/127, we read the exponent
** part as integer with up to 3 digits and drop the remainder.
** This avoids an overflow of Exp. The exponent is always
** decimal, even for hex float consts.
*/
Digits = 0;
Exp = 0;
while (IsDigit (CurC)) {
if (++Digits <= 3) {
Exp = Exp * 10 + HexVal (CurC);
}
NextChar ();
}
/* Check for errors: We must have exponent digits, and not more
** than three.
*/
if (Digits == 0) {
Error ("Floating constant exponent has no digits");
} else if (Digits > 3) {
Warning ("Floating constant exponent is too large");
}
/* Scale the exponent and adjust the value accordingly */
if (Exp) {
FVal = FP_D_Mul (FVal, FP_D_Make (pow (10, Exp)));
}
}
/* Check for a suffix and determine the type of the constant */
if (toupper (CurC) == 'F') {
NextChar ();
NextTok.Type = type_float;
} else {
NextTok.Type = type_double;
}
/* Set the value and the token */
NextTok.FVal = FVal;
NextTok.Tok = TOK_FCONST;
}
}
static int ParseChar (StrBuf* B)
/* Parse a character. Converts \n into EOL, etc. */
{
unsigned I;
unsigned Val;
int C;
/* Check for escape chars */
if ((C = SB_Get (B)) == '\\') {
switch (SB_Peek (B)) {
case '?':
C = '?';
SB_Skip (B);
break;
case 'a':
C = '\a';
SB_Skip (B);
break;
case 'b':
C = '\b';
SB_Skip (B);
break;
case 'f':
C = '\f';
SB_Skip (B);
break;
case 'r':
C = '\r';
SB_Skip (B);
break;
case 'n':
C = '\n';
SB_Skip (B);
break;
case 't':
C = '\t';
SB_Skip (B);
break;
case 'v':
C = '\v';
SB_Skip (B);
break;
case '\"':
C = '\"';
SB_Skip (B);
break;
case '\'':
C = '\'';
SB_Skip (B);
break;
case '\\':
C = '\\';
SB_Skip (B);
break;
case 'x':
case 'X':
/* Hex character constant */
SB_Skip (B);
C = HexVal (SB_Get (B)) << 4;
C |= HexVal (SB_Get (B));
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
/* Octal constant */
I = 0;
Val = SB_Get (B) - '0';
while (SB_Peek (B) >= '0' && SB_Peek (B) <= '7' && ++I <= 3) {
Val = (Val << 3) | (SB_Get (B) - '0');
}
C = (int) Val;
if (Val > 256) {
Error ("Character constant out of range");
C = ' ';
}
break;
default:
Error ("Illegal character constant 0x%02X", SB_Get (B));
C = ' ';
break;
}
}
/* Return the character */
return C;
}
static int ParseChar (void)
/* Parse a character. Converts escape chars into character codes. */
{
int C;
int HadError;
int Count;
/* Check for escape chars */
if (CurC == '\\') {
NextChar ();
switch (CurC) {
case '?':
C = '\?';
break;
case 'a':
C = '\a';
break;
case 'b':
C = '\b';
break;
case 'f':
C = '\f';
break;
case 'r':
C = '\r';
break;
case 'n':
C = '\n';
break;
case 't':
C = '\t';
break;
case 'v':
C = '\v';
break;
case '\"':
C = '\"';
break;
case '\'':
C = '\'';
break;
case '\\':
C = '\\';
break;
case 'x':
case 'X':
/* Hex character constant */
if (!IsXDigit (NextC)) {
Error ("\\x used with no following hex digits");
C = ' ';
} else {
HadError = 0;
C = 0;
while (IsXDigit (NextC)) {
if ((C << 4) >= 256) {
if (!HadError) {
Error ("Hex character constant out of range");
HadError = 1;
}
} else {
C = (C << 4) | HexVal (NextC);
}
NextChar ();
}
}
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
/* Octal constant */
Count = 1;
C = HexVal (CurC);
while (IsODigit (NextC) && Count++ < 3) {
C = (C << 3) | HexVal (NextC);
NextChar ();
}
if (C >= 256)
Error ("Octal character constant out of range");
break;
default:
C = CurC;
Error ("Illegal escaped character: 0x%02X", CurC);
break;
}
} else {
C = CurC;
}
/* Skip the character read */
NextChar ();
/* Do correct sign extension */
return SignExtendChar (C);
}
int SB_GetNumber (StrBuf* B, long* Val)
/* Get a number from the string buffer. Accepted formats are decimal, octal,
** hex and character constants. Numeric constants may be preceeded by a
** minus or plus sign. The function returns 1 if a number was found and
** zero otherwise. Errors are only output for invalid numbers.
*/
{
int Sign;
char C;
unsigned Base;
unsigned DigitVal;
/* Initialize Val */
*Val = 0;
/* Handle character constants */
if (SB_Peek (B) == '\'') {
/* Character constant */
SB_Skip (B);
*Val = SignExtendChar (TgtTranslateChar (ParseChar (B)));
if (SB_Peek (B) != '\'') {
Error ("`\'' expected");
return 0;
} else {
/* Skip the quote */
SB_Skip (B);
return 1;
}
}
/* Check for a sign. A sign must be followed by a digit, otherwise it's
** not a number
*/
Sign = 1;
switch (SB_Peek (B)) {
case '-':
Sign = -1;
/* FALLTHROUGH */
case '+':
if (!IsDigit (SB_LookAt (B, SB_GetIndex (B) + 1))) {
return 0;
}
SB_Skip (B);
break;
}
/* We must have a digit now, otherwise its not a number */
C = SB_Peek (B);
if (!IsDigit (C)) {
return 0;
}
/* Determine the base */
if (C == '0') {
/* Hex or octal */
SB_Skip (B);
if (tolower (SB_Peek (B)) == 'x') {
SB_Skip (B);
Base = 16;
if (!IsXDigit (SB_Peek (B))) {
Error ("Invalid hexadecimal number");
return 0;
}
} else {
Base = 8;
}
} else {
Base = 10;
}
/* Read the number */
while (IsXDigit (C = SB_Peek (B)) && (DigitVal = HexVal (C)) < Base) {
*Val = (*Val * Base) + DigitVal;
SB_Skip (B);
}
/* Allow optional 'U' and 'L' modifiers */
C = SB_Peek (B);
if (C == 'u' || C == 'U') {
SB_Skip (B);
C = SB_Peek (B);
if (C == 'l' || C == 'L') {
SB_Skip (B);
}
} else if (C == 'l' || C == 'L') {
SB_Skip (B);
C = SB_Peek (B);
if (C == 'u' || C == 'U') {
SB_Skip (B);
}
}
/* Success, value read is in Val */
*Val *= Sign;
return 1;
}