1 files changed, 68 insertions, 0 deletions
diff --git a/ed2k/ed2k.cpp b/ed2k/ed2k.cpp
new file mode 100644
index 0000000..369f57e
--- /dev/null
+++ b/ed2k/ed2k.cpp
@@ -0,0 +1,68 @@
+#include "ed2k.h"
+
+namespace Hex {
+	static char* digits = "0123456789abcdef";
+	std::string hex(char* bin, int length) {
+		std::string s(length * 2, ' ');
+		for(int i = 0; i < length; i++) {
+			s[i*2] = digits[(bin[i] >> 4) & 0xf];
+			s[i*2+1] = digits[bin[i] & 0xf];
+		}
+		return s;
+	}
+	std::string hex(int bin) {
+		std::string s(sizeof(int) * 2, ' ');
+		for(int i = 0; i < sizeof(int) * 2; i++) {
+			s[sizeof(int) * 2 - 1 - i] = digits[bin & 0xf];
+			bin = bin >> 4;
+		}
+		return s;
+	}
+}
+
+template<class T>
+inline T min(T a, T b) {
+	return (a > b) ? b : a;
+}
+
+Ed2k::Ed2k() {
+	MD4_Init(&md4_partial);
+	MD4_Init(&md4_final);
+	size_total = 0;
+	digest_str = "";
+}
+
+void Ed2k::update(std::string data_str) {
+	unsigned int length = data_str.length();
+	const char* data = data_str.c_str();
+	while(length) {
+		if(!(size_total % (9500 * 1024)) && size_total) {
+			unsigned char digest[16];
+			MD4_Final(digest, &md4_partial);
+			MD4_Update(&md4_final, digest, 16);
+			MD4_Init(&md4_partial);
+		}
+		int size = min<int>(length, (9500 * 1024) - (size_total % (9500 * 1024)));
+		MD4_Update(&md4_partial, data, size);
+		length -= size;
+		data += size;
+		size_total += size;
+	};
+}
+
+std::string Ed2k::digest() {
+	if(!digest_str.length()) {
+		char* digest = new char[16];
+		if(size_total > (9500 * 1024)) {
+			unsigned char digest_partial[16];
+			MD4_Final(digest_partial, &md4_partial);
+			MD4_Update(&md4_final, digest_partial, 16);
+			MD4_Final((unsigned char*)digest, &md4_final);
+		} else {
+			MD4_Final((unsigned char*)digest, &md4_partial);
+		}
+		digest_str = Hex::hex(digest, 16);
+		delete digest;
+	}
+	return digest_str;
+}