Setup basic piece table like data structure.

include/vase/original_buffer.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "pch.h"
+
+struct OriginalBuffer {
+  char *buf;
+  uint32_t length;
+  std::vector<uint32_t> newlines;
+
+  // TODO: replace with file io or even lazy loaded file io for large files/logs etc. later.
+  OriginalBuffer(char *buf, uint32_t length) : buf(buf), length(length) {
+    const char *p = buf;
+    const char *end = buf + length;
+    while (p < end) {
+      p = (const char *)memchr(p, '\n', end - p);
+      if (!p)
+        break;
+      newlines.push_back(uint32_t(p - buf));
+      p++;
+    }
+  }
+
+  ~OriginalBuffer() {
+    free(buf);
+  }
+};