1 files changed, 45 insertions, 0 deletions
diff --git a/src/miasm/core/bin_stream_ida.py b/src/miasm/core/bin_stream_ida.py
new file mode 100644
index 00000000..15bd9d8b
--- /dev/null
+++ b/src/miasm/core/bin_stream_ida.py
@@ -0,0 +1,45 @@
+from builtins import range
+from idc import get_wide_byte, get_segm_end
+from idautils import Segments
+from idaapi import is_mapped
+
+from miasm.core.utils import int_to_byte
+from miasm.core.bin_stream import bin_stream_str
+
+
+class bin_stream_ida(bin_stream_str):
+    """
+    bin_stream implementation for IDA
+
+    Don't generate xrange using address computation:
+    It can raise error on overflow 7FFFFFFF with 32 bit python
+    """
+    def _getbytes(self, start, l=1):
+        out = []
+        for ad in range(l):
+            offset = ad + start + self.base_address
+            if not is_mapped(offset):
+                raise IOError(f"not enough bytes @ offset {offset:x}")
+            out.append(int_to_byte(get_wide_byte(offset)))
+        return b''.join(out)
+
+    def readbs(self, l=1):
+        if self.offset + l > self.l:
+            raise IOError("not enough bytes")
+        content = self.getbytes(self.offset)
+        self.offset += l
+        return content
+
+    def __str__(self):
+        raise NotImplementedError('Not fully functional')
+
+    def setoffset(self, val):
+        self.offset = val
+
+    def getlen(self):
+        # Lazy version
+        if hasattr(self, "_getlen"):
+            return self._getlen
+        max_addr = get_segm_end(list(Segments())[-1]  - (self.offset - self.base_address))
+        self._getlen = max_addr
+        return max_addr