/// <summary>
/// Parse a base 10 numeric from a sequence of ASCII digits into a long.
/// <para />
/// Digit sequences can begin with an optional run of spaces before the
/// sequence, and may start with a '+' or a '-' to indicate sign position.
/// Any other characters will cause the method to stop and return the current
/// result to the caller.
/// </summary>
/// <param name="b">Buffer to scan.</param>
/// <param name="ptr">
/// Position within buffer to start parsing digits at.
/// </param>
/// <param name="ptrResult">
/// Optional location to return the new ptr value through. If null
/// the ptr value will be discarded.
/// </param>
/// <returns>
/// The value at this location; 0 if the location is not a valid
/// numeric.
/// </returns>
public static long parseLongBase10(byte[] b, int ptr, MutableInteger ptrResult)
{
long r = 0;
int sign = 0;
try
{
int sz = b.Length;
while (ptr < sz && b[ptr] == ' ')
{
ptr++;
}
if (ptr >= sz)
{
return(0);
}
switch (b[ptr])
{
case (byte)'-':
sign = -1;
ptr++;
break;
case (byte)'+':
ptr++;
break;
}
while (ptr < sz)
{
int v = b[ptr] - (byte)'0';
if (v < 0)
{
break;
}
r = (r * 10) + v;
ptr++;
}
}
catch (IndexOutOfRangeException)
{
// Not a valid digit.
}
if (ptrResult != null)
{
ptrResult.value = ptr;
}
return(sign < 0 ? -r : r);
}
/**
* Parse a base 10 numeric from a sequence of ASCII digits into an int.
* <para />
* Digit sequences can begin with an optional run of spaces before the
* sequence, and may start with a '+' or a '-' to indicate sign position.
* Any other characters will cause the method to stop and return the current
* result to the caller.
*
* @param b
* buffer to scan.
* @param ptr
* position within buffer to start parsing digits at.
* @param ptrResult
* optional location to return the new ptr value through. If null
* the ptr value will be discarded.
* @return the value at this location; 0 if the location is not a valid
* numeric.
*/
public static int parseBase10(byte[] b, int ptr, MutableInteger ptrResult)
{
int r = 0;
int sign = 0;
try
{
int sz = b.Length;
while (ptr < sz && b[ptr] == ' ')
{
ptr++;
}
if (ptr >= sz)
{
return(0);
}
switch (b[ptr])
{
case ((byte)'-'):
sign = -1;
ptr++;
break;
case ((byte)'+'):
ptr++;
break;
}
while (ptr < sz)
{
byte d = b[ptr];
if ((d < (byte)'0') || (d > (byte)'9'))
{
break;
}
r = r * 10 + (d - (byte)'0');
ptr++;
}
}
catch (IndexOutOfRangeException)
{
// Not a valid digit.
}
if (ptrResult != null)
{
ptrResult.value = ptr;
}
return(sign < 0 ? -r : r);
}
/// <summary>
/// Parse a base 10 numeric from a sequence of ASCII digits into a long.
/// <para />
/// Digit sequences can begin with an optional run of spaces before the
/// sequence, and may start with a '+' or a '-' to indicate sign position.
/// Any other characters will cause the method to stop and return the current
/// result to the caller.
/// </summary>
/// <param name="b">Buffer to scan.</param>
/// <param name="ptr">
/// Position within buffer to start parsing digits at.
/// </param>
/// <param name="ptrResult">
/// Optional location to return the new ptr value through. If null
/// the ptr value will be discarded.
/// </param>
/// <returns>
/// The value at this location; 0 if the location is not a valid
/// numeric.
/// </returns>
public static long parseLongBase10(byte[] b, int ptr, MutableInteger ptrResult)
{
long r = 0;
int sign = 0;
try
{
int sz = b.Length;
while (ptr < sz && b[ptr] == ' ')
ptr++;
if (ptr >= sz)
return 0;
switch (b[ptr])
{
case (byte)'-':
sign = -1;
ptr++;
break;
case (byte)'+':
ptr++;
break;
}
while (ptr < sz)
{
int v = b[ptr] - (byte)'0';
if (v < 0)
break;
r = (r * 10) + v;
ptr++;
}
}
catch (IndexOutOfRangeException)
{
// Not a valid digit.
}
if (ptrResult != null)
ptrResult.value = ptr;
return sign < 0 ? -r : r;
}
/**
* Parse a base 10 numeric from a sequence of ASCII digits into an int.
* <para />
* Digit sequences can begin with an optional run of spaces before the
* sequence, and may start with a '+' or a '-' to indicate sign position.
* Any other characters will cause the method to stop and return the current
* result to the caller.
*
* @param b
* buffer to scan.
* @param ptr
* position within buffer to start parsing digits at.
* @param ptrResult
* optional location to return the new ptr value through. If null
* the ptr value will be discarded.
* @return the value at this location; 0 if the location is not a valid
* numeric.
*/
public static int parseBase10(byte[] b, int ptr, MutableInteger ptrResult)
{
int r = 0;
int sign = 0;
try
{
int sz = b.Length;
while (ptr < sz && b[ptr] == ' ')
ptr++;
if (ptr >= sz)
return 0;
switch (b[ptr])
{
case ((byte)'-'):
sign = -1;
ptr++;
break;
case ((byte)'+'):
ptr++;
break;
}
while (ptr < sz)
{
byte d = b[ptr];
if ((d < (byte)'0') || (d > (byte)'9'))
break;
r = r * 10 + (d - (byte)'0');
ptr++;
}
}
catch (IndexOutOfRangeException)
{
// Not a valid digit.
}
if (ptrResult != null)
ptrResult.value = ptr;
return sign < 0 ? -r : r;
}
