28 indexerror bytearray index out of range when appending to file

hexabyte/actions/api/set.py

@@ -111,8 +111,11 @@ def do(self) -> None:
         if self.target is None:
             raise ActionError("Action target not set.")
         api = self.target
+        if self.offset.byte == api.cursor.max_bytes:
+            api.cursor.max_bytes += 1
         api.seek(self.offset.byte)
-        self.previous_value = unpack("@B", api.read(1))[0]
+        current_data = api.read(1)
+        self.previous_value = unpack("@B", current_data)[0] if current_data else 0
         if self.offset_type == OffsetType.BIT:
             bit_position = self.offset.remainder_bits
             if self.value == 0:

hexabyte/cursor.py

@@ -24,7 +24,7 @@ def __init__(self, val: int = 0, max_bytes: int = 0) -> None:
         """Initialize Cursor."""
         super().__init__()
         self._absolute = val
-        self._max = max_bytes * BYTE_BITS
+        self.max_bytes = max_bytes
 
     @property
     def bit(self) -> int:
@@ -77,6 +77,16 @@ def dword64(self, byte_offset: int) -> None:
         """
         self.byte = byte_offset >> DWORD64_ALIGN_BITS << DWORD64_ALIGN_BITS
 
+    @property
+    def max_bytes(self) -> int:
+        """Return the max bytes allowed by cursor."""
+        return self._max // BYTE_BITS
+
+    @max_bytes.setter
+    def max_bytes(self, max_bytes: int) -> None:
+        """Set the max byte value for cursor."""
+        self._max = max_bytes * BYTE_BITS
+
     @property
     def nibble(self) -> int:
         """Return the nibble aligned cursor position as bit offset."""

hexabyte/view_components/byte_view.py

@@ -187,6 +187,13 @@ def generate_text(self, offset: int, data: bytes, highlights: list[DataSegment])
             text = self._generate_hex_text(offset, data, highlights)
         if self.view_mode is DisplayMode.UTF8:
             text = self._generate_utf8_text(offset, data, highlights)
+        if (
+            self.cursor_visible
+            and self.cursor is not None
+            and self.cursor.byte >= offset + len(data)
+            and self.cursor.byte < offset + self.line_byte_length
+        ):
+            text.append(Text(" ", self.cursor_style))
         return text
 
     def _generate_bin_text(self, offset: int, data: bytes, highlights: list[DataSegment]) -> Text:
@@ -195,6 +202,8 @@ def _generate_bin_text(self, offset: int, data: bytes, highlights: list[DataSegm
         byte_position = offset
         for col_start in range(0, self.line_byte_length, self.column_size):
             chunk = data[col_start : col_start + self.column_size]
+            if not chunk:
+                break
             for bite in chunk:
                 if bite == 0:
                     txt = Text("00000000", self.text_style)
@@ -211,7 +220,8 @@ def _generate_bin_text(self, offset: int, data: bytes, highlights: list[DataSegm
                             txt.stylize(self.highlight_style)
                 text.append(txt)
                 byte_position += 1
-            text.append(" ")
+            if self.line_byte_length != self.column_size:
+                text.append(" ")
         return text
 
     def _generate_hex_text(self, offset: int, data: bytes, highlights: list[DataSegment]) -> Text:
@@ -220,6 +230,8 @@ def _generate_hex_text(self, offset: int, data: bytes, highlights: list[DataSegm
         byte_position = offset
         for col_start in range(0, self.line_byte_length, self.column_size):
             chunk = data[col_start : col_start + self.column_size]
+            if not chunk:
+                break
             for bite in chunk:
                 if bite == 0:
                     txt = Text("00", self.text_style)
@@ -237,7 +249,8 @@ def _generate_hex_text(self, offset: int, data: bytes, highlights: list[DataSegm
                             txt.stylize(self.highlight_style)
                 text.append(txt)
                 byte_position += 1
-            text.append(" ")
+            if self.line_byte_length != self.column_size:
+                text.append(" ")
         return text
 
     def _generate_utf8_text(self, offset: int, data: bytes, highlights: list[DataSegment]) -> Text:
@@ -246,6 +259,8 @@ def _generate_utf8_text(self, offset: int, data: bytes, highlights: list[DataSeg
         byte_position = offset
         for col_start in range(0, self.line_byte_length, self.column_size):
             chunk = data[col_start : col_start + self.column_size]
+            if not chunk:
+                break
             for bite in chunk:
                 if not chr(bite).isprintable():
                     txt = Text(".", self.text_style)
@@ -262,7 +277,8 @@ def _generate_utf8_text(self, offset: int, data: bytes, highlights: list[DataSeg
                             txt.stylize(self.highlight_style)
                 text.append(txt)
                 byte_position += 1
-            text.append(" ")
+            if self.line_byte_length != self.column_size:
+                text.append(" ")
         return text
 
     def _get_view(

hexabyte/widgets/editor.py

@@ -184,7 +184,7 @@ def __init__(
     @property
     def _cursor_at_end(self) -> bool:
         """Flag to indicate if the cursor is at the end."""
-        return self.cursor >= len(self.api) * BYTE_BITS
+        return self.cursor > self.api.cursor.max_bytes
 
     @property
     def _cursor_y(self) -> int:
@@ -288,7 +288,8 @@ def insert_at_cursor(self, char: str) -> None:
         # if text not in ByteView.VALID_CHARS[self.display_mode]:
         #     raise ValueError("Invalid Character")
         self.api.cursor.bit = self.cursor
-        current_value = self.api.read_at(self.api.cursor.byte, 1)[0]
+        current_data = self.api.read_at(self.api.cursor.byte, 1)
+        current_value = current_data[0] if current_data else 0
         if self.display_mode == DisplayMode.HEX:
             nibble = self.api.cursor.remainder_bits // NIBBLE_BITS
             cmd = f"set nibble {self.api.cursor.byte} {nibble} 0x{char}"