Update devices to match new specifications

1 files changed, 23 insertions, 0 deletions

diff --git a/src/devices/system/read_only_text_buffer.rs b/src/devices/system/read_only_text_buffer.rs
new file mode 100644
index 0000000..7c59025
--- /dev/null
+++ b/src/devices/system/read_only_text_buffer.rs
@@ -0,0 +1,23 @@
+pub struct ReadOnlyTextBuffer {
+    chars: Vec<u8>,
+    pointer: usize,
+}
+
+impl ReadOnlyTextBuffer {
+    pub fn from_text(text: &str) -> Self {
+        Self {
+            chars: text.chars().map(|c| c as u32 as u8).collect(),
+            pointer: 0,
+        }
+    }
+
+    pub fn read_byte(&mut self) -> u8 {
+        let byte = self.chars[self.pointer];
+        self.pointer += 1;
+        return byte;
+    }
+
+    pub fn reset_pointer(&mut self) {
+        self.pointer = 0;
+    }
+}