Debugger stuff. Lots of wasted work :/

src/xenia/debug/proto/varint.h

@@ -0,0 +1,74 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_DEBUG_PROTO_VARINT_H_
+#define XENIA_DEBUG_PROTO_VARINT_H_
+
+#include <cstdint>
+
+namespace xe {
+namespace debug {
+namespace proto {
+
+struct varint_t {
+  varint_t() = default;
+  varint_t(uint64_t value) : value_(value) {}
+  varint_t(const varint_t& other) : value_(other.value_) {}
+
+  operator uint64_t() const { return value_; }
+  uint64_t value() const { return value_; }
+
+  size_t size() const {
+    uint64_t value = value_;
+    size_t i = 0;
+    do {
+      value >>= 7;
+      ++i;
+    } while (value >= 0x80);
+    return i + 1;
+  }
+
+  const uint8_t* Read(const uint8_t* src) {
+    if (!(src[0] & 0x80)) {
+      value_ = src[0];
+      return src + 1;
+    }
+    uint64_t r = src[0] & 0x7F;
+    size_t i;
+    for (i = 1; i < 10; ++i) {
+      r |= (src[i] & 0x7F) << (7 * i);
+      if (!(src[i] & 0x80)) {
+        break;
+      }
+    }
+    value_ = r;
+    return src + i + 1;
+  }
+
+  uint8_t* Write(uint8_t* dest) {
+    uint64_t value = value_;
+    size_t i = 0;
+    do {
+      dest[i] = uint8_t(value | 0x80);
+      value >>= 7;
+      ++i;
+    } while (value >= 0x80);
+    dest[i] = uint8_t(value);
+    return dest + i + 1;
+  }
+
+ private:
+  uint64_t value_ = 0;
+};
+
+}  // namespace proto
+}  // namespace debug
+}  // namespace xe
+
+#endif  // XENIA_DEBUG_PROTO_VARINT_H_