1 files changed, 46 insertions, 0 deletions
diff --git a/external/construct/lib/hex.py b/external/construct/lib/hex.py
new file mode 100644
index 0000000..62fd3c7
--- /dev/null
+++ b/external/construct/lib/hex.py
@@ -0,0 +1,46 @@
+from construct.lib.py3compat import byte2int, int2byte, bytes2str
+
+
+# Map an integer in the inclusive range 0-255 to its string byte representation
+_printable = dict((i, ".") for i in range(256))
+_printable.update((i, bytes2str(int2byte(i))) for i in range(32, 128))
+
+
+def hexdump(data, linesize):
+    """
+    data is a bytes object. The returned result is a string.
+    """
+    prettylines = []
+    if len(data) < 65536:
+        fmt = "%%04X   %%-%ds   %%s"
+    else:
+        fmt = "%%08X   %%-%ds   %%s"
+    fmt = fmt % (3 * linesize - 1,)
+    for i in range(0, len(data), linesize):
+        line = data[i : i + linesize]
+        hextext = " ".join('%02x' % byte2int(b) for b in line)
+        rawtext = "".join(_printable[byte2int(b)] for b in line)
+        prettylines.append(fmt % (i, str(hextext), str(rawtext)))
+    return prettylines
+
+
+try:
+    basecls = bytes
+except NameError:
+    basecls = str
+
+class HexString(basecls):
+    """
+    Represents bytes that will be hex-dumped to a string when its string
+    representation is requested.
+    """
+    def __init__(self, data, linesize = 16):
+        self.linesize = linesize
+    def __new__(cls, data, *args, **kwargs):
+        return basecls.__new__(cls, data)
+    def __str__(self):
+        if not self:
+            return "''"
+        return "\n" + "\n".join(hexdump(self, self.linesize))
+
+