Initial community commit

1 files changed, 78 insertions, 0 deletions

diff --git a/Src/auth/decode.cpp b/Src/auth/decode.cpp
new file mode 100644
index 00000000..691f8d43
--- /dev/null
+++ b/Src/auth/decode.cpp
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <bfc/platform/types.h>
+#include <strsafe.h>
+
+static uint8_t quickhex(char c)
+{
+	int hexvalue = c;
+	if (hexvalue & 0x10)
+		hexvalue &= ~0x30;
+	else
+	{
+		hexvalue &= 0xF;
+		hexvalue += 9;
+	}
+	return hexvalue;
+}
+
+static uint8_t DecodeEscape(const char *&str)
+{
+	uint8_t a = quickhex(*++str);
+	uint8_t b = quickhex(*++str);
+	str++;
+	return a * 16 + b;
+}
+
+static void DecodeEscapedUTF8(char *&output, const char *&input)
+{
+	uint8_t utf8_data[1024] = {0}; // hopefully big enough!!
+	int num_utf8_words=0;
+	bool error=false;
+
+	while (input && *input && *input == '%' && num_utf8_words < sizeof(utf8_data))
+	{
+		if (isxdigit(input[1]) && isxdigit(input[2]))
+		{
+			utf8_data[num_utf8_words++]=DecodeEscape(input);
+		}
+		else if (input[1] == '%')
+		{
+			input+=2;
+			utf8_data[num_utf8_words++]='%';
+		}
+		else
+		{
+			error = true;
+			break;
+		}
+	}
+
+	memcpy(output, utf8_data, num_utf8_words);
+	output+=num_utf8_words;
+	//StringCchCopyExA(output, num_utf8_words, (char *)utf8_data, &output, 0, 0);
+
+	if (error)
+	{
+		*output++ = *input++;
+	}
+}
+
+// benski> We have the luxury of knowing that decoding will ALWAYS produce smaller strings
+// so we can do it in-place
+void UrlDecode(char *str)
+{
+	const char *itr = str;
+	while (itr && *itr)
+	{
+		switch (*itr)
+		{
+			case '%':
+				DecodeEscapedUTF8(str, itr);
+				break;
+			default:
+				*str++ = *itr++;
+				break;
+		}
+	}
+	*str = 0;
+}
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