initial code for dumping imessages in a reasonable format

2014-02-09 00:30:49 +01:00
parent c0021efb13
commit 9dd7628f04
157 changed files with 24178 additions and 0 deletions
--- a/dump-imessages/iphone-dataprotection/python_scripts/util/lzss.py
+++ b/dump-imessages/iphone-dataprotection/python_scripts/util/lzss.py
@@ -0,0 +1,71 @@
+"""
+/**************************************************************
+ LZSS.C -- A Data Compression Program
+***************************************************************
+    4/6/1989 Haruhiko Okumura
+    Use, distribute, and modify this program freely.
+    Please send me your improved versions.
+        PC-VAN      SCIENCE
+        NIFTY-Serve PAF01022
+        CompuServe  74050,1022
+
+**************************************************************/
+/*
+ *  lzss.c - Package for decompressing lzss compressed objects
+ *
+ *  Copyright (c) 2003 Apple Computer, Inc.
+ *
+ *  DRI: Josh de Cesare
+ */
+"""
+from array import array
+import struct
+
+N = 4096
+F = 18
+THRESHOLD = 2
+NIL = N
+
+def decompress_lzss(str):
+    if str[:8] !="complzss":
+        print "decompress_lzss: complzss magic missing"
+        return
+    decompsize = struct.unpack(">L", str[12:16])[0]
+    text_buf = array("B", " "*(N + F - 1))
+    src = array("B", str[0x180:])
+    srclen = len(src)
+    dst = array("B", " "*decompsize)
+    r = N - F
+    srcidx, dstidx, flags, c = 0, 0, 0, 0
+
+    while True:
+        flags >>= 1
+        if ((flags & 0x100) == 0):
+            if (srcidx >= srclen):
+                break
+            c = src[srcidx]; srcidx += 1
+            flags = c | 0xFF00;
+
+        if (flags & 1):
+            if (srcidx >= srclen):
+                break
+            c = src[srcidx]; srcidx += 1
+            dst[dstidx] = c; dstidx += 1
+            text_buf[r] = c; r += 1
+            r &= (N - 1);
+        else:
+            if (srcidx >= srclen):
+                break
+            i = src[srcidx]; srcidx += 1
+            if (srcidx >= srclen):
+                break
+            j = src[srcidx]; srcidx += 1
+            i |= ((j & 0xF0) << 4)
+            j  =  (j & 0x0F) + THRESHOLD
+            for k in xrange(j+1):
+                c = text_buf[(i + k) & (N - 1)]
+                dst[dstidx] = c; dstidx += 1
+                text_buf[r] = c; r += 1
+                r &= (N - 1)
+    return dst.tostring()
+