kaitai: adjustments and rearrangements for python2/3 compat

1 files changed, 108 insertions, 0 deletions

diff --git a/python/examples/kaitai/vlq_base128_le.py b/python/examples/kaitai/vlq_base128_le.py
new file mode 100644
index 00000000..6fa8d43b
--- /dev/null
+++ b/python/examples/kaitai/vlq_base128_le.py
@@ -0,0 +1,108 @@
+# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
+
+from pkg_resources import parse_version
+from .kaitaistruct import __version__ as ks_version, KaitaiStruct, KaitaiStream, BytesIO
+import collections
+
+
+if parse_version(ks_version) < parse_version('0.7'):
+    raise Exception("Incompatible Kaitai Struct Python API: 0.7 or later is required, but you have %s" % (ks_version))
+
+class VlqBase128Le(KaitaiStruct):
+    """A variable-length unsigned integer using base128 encoding. 1-byte groups
+    consist of 1-bit flag of continuation and 7-bit value chunk, and are ordered
+    "least significant group first", i.e. in "little-endian" manner.
+    
+    This particular encoding is specified and used in:
+    
+    * DWARF debug file format, where it's dubbed "unsigned LEB128" or "ULEB128".
+      http://dwarfstd.org/doc/dwarf-2.0.0.pdf - page 139
+    * Google Protocol Buffers, where it's called "Base 128 Varints".
+      https://developers.google.com/protocol-buffers/docs/encoding?csw=1#varints
+    * Apache Lucene, where it's called "VInt"
+      http://lucene.apache.org/core/3_5_0/fileformats.html#VInt
+    * Apache Avro uses this as a basis for integer encoding, adding ZigZag on
+      top of it for signed ints
+      http://avro.apache.org/docs/current/spec.html#binary_encode_primitive
+    
+    More information on this encoding is available at https://en.wikipedia.org/wiki/LEB128
+    
+    This particular implementation supports serialized values to up 8 bytes long.
+    """
+    SEQ_FIELDS = ["groups"]
+    def __init__(self, _io, _parent=None, _root=None):
+        self._io = _io
+        self._parent = _parent
+        self._root = _root if _root else self
+        self._debug = collections.defaultdict(dict)
+
+    def _read(self):
+        self._debug['groups']['start'] = self._io.pos()
+        self.groups = []
+        i = 0
+        while True:
+            if not 'arr' in self._debug['groups']:
+                self._debug['groups']['arr'] = []
+            self._debug['groups']['arr'].append({'start': self._io.pos()})
+            _t_groups = self._root.Group(self._io, self, self._root)
+            _t_groups._read()
+            _ = _t_groups
+            self.groups.append(_)
+            self._debug['groups']['arr'][len(self.groups) - 1]['end'] = self._io.pos()
+            if not (_.has_next):
+                break
+            i += 1
+        self._debug['groups']['end'] = self._io.pos()
+
+    class Group(KaitaiStruct):
+        """One byte group, clearly divided into 7-bit "value" chunk and 1-bit "continuation" flag.
+        """
+        SEQ_FIELDS = ["b"]
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self._debug = collections.defaultdict(dict)
+
+        def _read(self):
+            self._debug['b']['start'] = self._io.pos()
+            self.b = self._io.read_u1()
+            self._debug['b']['end'] = self._io.pos()
+
+        @property
+        def has_next(self):
+            """If true, then we have more bytes to read."""
+            if hasattr(self, '_m_has_next'):
+                return self._m_has_next if hasattr(self, '_m_has_next') else None
+
+            self._m_has_next = (self.b & 128) != 0
+            return self._m_has_next if hasattr(self, '_m_has_next') else None
+
+        @property
+        def value(self):
+            """The 7-bit (base128) numeric value chunk of this group."""
+            if hasattr(self, '_m_value'):
+                return self._m_value if hasattr(self, '_m_value') else None
+
+            self._m_value = (self.b & 127)
+            return self._m_value if hasattr(self, '_m_value') else None
+
+
+    @property
+    def len(self):
+        if hasattr(self, '_m_len'):
+            return self._m_len if hasattr(self, '_m_len') else None
+
+        self._m_len = len(self.groups)
+        return self._m_len if hasattr(self, '_m_len') else None
+
+    @property
+    def value(self):
+        """Resulting value as normal integer."""
+        if hasattr(self, '_m_value'):
+            return self._m_value if hasattr(self, '_m_value') else None
+
+        self._m_value = (((((((self.groups[0].value + ((self.groups[1].value << 7) if self.len >= 2 else 0)) + ((self.groups[2].value << 14) if self.len >= 3 else 0)) + ((self.groups[3].value << 21) if self.len >= 4 else 0)) + ((self.groups[4].value << 28) if self.len >= 5 else 0)) + ((self.groups[5].value << 35) if self.len >= 6 else 0)) + ((self.groups[6].value << 42) if self.len >= 7 else 0)) + ((self.groups[7].value << 49) if self.len >= 8 else 0))
+        return self._m_value if hasattr(self, '_m_value') else None
+
+