aaru-dps/Aaru.Helpers
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Optimize hex string to byte array marshaller.

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This commit is contained in:
Natalia Portillo
2020-12-08 01:18:44 +00:00
parent 4fe08ed668
commit 65296b6ccc
1 changed files with 48 additions and 13 deletions
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61
Marshal.cs
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@@ -430,23 +430,58 @@ namespace Aaru.Helpers
public static int ConvertFromHexAscii(string hex, out byte[] outBuf)
{
if(hex.StartsWith("0x", StringComparison.InvariantCultureIgnoreCase))
hex = hex.Substring(2);
outBuf = null;
outBuf = new byte[hex.Length / 2];
if(hex is null ||
hex == "")
return -1;
int off = 0;
if(hex[0] == '0' &&
(hex[1] == 'x' || hex[1] == 'X'))
{
off = 2;
}
outBuf = new byte[(hex.Length - off) / 2];
int count = 0;
try
for(int i = off; i < hex.Length; i += 2)
{
for(int i = 0; i < hex.Length; i += 2)
{
outBuf[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
count++;
}
}
catch
{
count = 0;
char c = hex[i];
if(c < '0' ||
(c > '9' && c < 'A') ||
(c > 'F' && c < 'a') ||
c > 'f')
break;
c -= c >= 'a' && c <= 'f'
? '\u0057'
: c >= 'A' && c <= 'F'
? '\u0037'
: '\u0030';
outBuf[(i - off) / 2] = (byte)(c << 4);
c = hex[i + 1];
if(c < '0' ||
(c > '9' && c < 'A') ||
(c > 'F' && c < 'a') ||
c > 'f')
break;
c -= c >= 'a' && c <= 'f'
? '\u0057'
: c >= 'A' && c <= 'F'
? '\u0037'
: '\u0030';
outBuf[(i - off) / 2] += (byte)c;
count++;
}
return count;