(C) Decode 2-digit Hex Escaped

Demonstrates how to replace escaped us-ascii chars such as \x7b and \x22 with the chars.

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#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    const char *s;
    HCkStringBuilder sb;
    int numReplaced;

    // We have the following string with some us-ascii chars escaped like this:
    s = "\x7b\x22responseContext\x22:\x7b\x22";

    // Note: The above escaping does not conform to any standard format (as far as I know).
    // Chilkat does not have anything to decode from the above.
    // However, we can 1st transform into a standard format, and then decode..

    // JSON escapes chars outside us-ascii like this:  "Hello, \ud83d\ude03!"
    // We can transform the above to this:  "\u007b\u0022responseContext\u0022:\u007b\u0022"
    // And then decode..

    sb = CkStringBuilder_Create();

    CkStringBuilder_Append(sb,s);
    numReplaced = CkStringBuilder_Replace(sb,"\\x","\\u00");

    // Now decode from "json" escapes
    CkStringBuilder_Decode(sb,"json","utf-8");

    // Show the decoded string
    printf("%s\n",CkStringBuilder_getAsString(sb));

    // Here's the result: {"responseContext":{"


    CkStringBuilder_Dispose(sb);

    }