1 files changed, 107 insertions, 0 deletions
diff --git a/crawl-ref/source/python/binfile.py b/crawl-ref/source/python/binfile.py
new file mode 100644
index 0000000000..2ebb986539
--- /dev/null
+++ b/crawl-ref/source/python/binfile.py
@@ -0,0 +1,107 @@
+import struct
+
+class reader(object):
+    """Wrapper around a read-only binary file"""
+    def __init__(self, fileorname):
+        """fileorname may be a file-like object or a filename"""
+        self.byteorder = '='    # can also be '<' or '>'
+        if hasattr(fileorname, 'read'):
+            self.file = fileorname
+        else:
+            self.file = file(fileorname, 'rb')
+
+    def read(self,len): return self.file.read(len)
+
+    def stream(self, fmt, len=0):
+        """Unpack fmt from f and return results."""
+        fmt = self.byteorder + fmt                 # don't enforce alignment!
+        if len == 0: len = struct.calcsize(fmt)
+        data = self.file.read(len)
+        return struct.unpack(fmt, data)
+
+    def stream1(self, fmt, len=0):
+        """Unpack fmt from f and return just one result."""
+        (data,) = self.stream(fmt,len)
+        return data
+
+    def _streamStringLow(self, len):
+        if len <= 0: return ''
+        str = self.file.read(len-1)
+        char = self.file.read(1)
+        if ord(char)==0: return str
+        else: return str+char
+
+    def streamCooky(self):
+        l = list(self.stream("4c"))
+        l.reverse()
+        return ''.join(l)
+        
+    def streamString4(self):
+        """Stream string prefixed with 4 bytes of length"""
+        (strlen,) = self.stream("I",4)
+        if strlen >= 2048:
+            print "Bad string len: %#x" % strlen
+            assert strlen < 2048
+        return self._streamStringLow(strlen)
+
+    def streamString2(self):
+        """Stream string prefixed with 2 bytes of length"""
+        (strlen,) = self.stream("H",2)
+        assert strlen < 2048
+        return self._streamStringLow(strlen)
+
+    def streamString1(self):
+        """Stream string prefixed with 1 byte of length"""
+        (strlen,) = self.stream("B",1)
+        assert strlen < 2048
+        return self._streamStringLow(strlen)
+    
+class writer(object):
+    """Wrapper around a write-only binary file"""
+    def __init__(self, fileorname):
+        """fileorname may be a file-like object or a filename"""
+        if hasattr(fileorname, 'write'):
+            self.file = fileorname
+        else:
+            self.file = file(fileorname, 'wb')
+
+    def write(self,data): return self.file.write(data)
+    def stream(self, fmt, *args):
+        fmt = '='+fmt                   # add the "no alignment" flag to the fmt
+        self.file.write(struct.pack(fmt, *args))
+    # for symmetry with reader
+    def stream1(self, fmt, *args):
+        fmt = '='+fmt                   # add the "no alignment" flag to the fmt
+        self.file.write(struct.pack(fmt, *args))
+
+    def streamCooky(self, cooky):
+        assert len(cooky)==4
+        l = list(cooky)
+        l.reverse()
+        self.stream("4c", *l)
+        
+    def streamString1(self, str):
+        """Stream string prefixed with 1 byte of length"""
+        #print "writing %s" % str
+        # Game doesn't handle 0-length null strings
+        self.file.write(struct.pack("B",len(str)+1))
+        self.file.write(str)
+        self.file.write("\0")
+
+    def streamString2(self, str):
+        """Stream string prefixed with 2 bytes of length"""
+        #print "writing %s" % str
+        # Game doesn't handle 0-length null strings
+        self.file.write(struct.pack("H",len(str)+1))
+        self.file.write(str)
+        self.file.write("\0")
+
+    def streamString4(self, str):
+        """Stream string prefixed with 4 bytes of length"""
+        if str=='':
+            self.file.write(struct.pack("I",0))
+        else:
+            #print "writing %s" % str
+            self.file.write(struct.pack("I",len(str)+1))
+            self.file.write(str)
+            self.file.write("\0")