Fixed #7: removed check for low load address; have examples of loading boot sectors at $0080

* added new check for valid ATR disk image size if boot sector not recognized

atrcopy/ataridos.py

@@ -416,6 +416,12 @@ class AtrHeader(BaseHeader):
         pos += self.header_offset
         return pos, size
 
+    def strict_check(self, image):
+        size = len(image)
+        if self.header_offset == 16 or size in [92176, 133136, 184336, 183952]:
+            return
+        raise InvalidDiskImage("Uncommon size of ATR file")
+
 
 class XfdHeader(AtrHeader):
     file_format = "XFD"
@@ -689,8 +695,8 @@ class BootDiskImage(AtariDosDiskImage):
         max_size = max_ram - bload
         max_sectors = max_size // self.header.sector_size
         if nsec > max_sectors or nsec < 1:
-            raise InvalidDiskImage("Number of boot sectors out of range")
+            raise InvalidDiskImage("Number of boot sectors out of range (tried %d, max=%d" % (nsec, max_sectors))
-        if bload < 0x200 or bload > (0xc000 - (nsec * self.header.sector_size)):
+        if bload > (0xc000 - (nsec * self.header.sector_size)):
             raise InvalidDiskImage("Bad boot load address")
 
     def get_boot_sector_info(self):
@@ -732,6 +738,19 @@ class BootDiskImage(AtariDosDiskImage):
         return []
 
 
+class AtariDiskImage(BootDiskImage):
+    def __str__(self):
+        return "%s Unidentified Contents" % (self.header)
+
+    def check_size(self):
+        print self.header
+        if self.header is None:
+            raise ("Not a known Atari disk image format")
+
+    def get_boot_segments(self):
+        return []
+
+
 def get_xex(segments, run_addr=None):
     segments_copy = [s for s in segments]  # don't affect the original list!
     main_segment = None

atrcopy/parsers.py

@@ -5,7 +5,7 @@ import numpy as np
 
 from .segments import SegmentData, DefaultSegment
 from .kboot import KBootImage
-from .ataridos import AtariDosDiskImage, BootDiskImage, AtariDosFile, XexContainerSegment
+from .ataridos import AtariDosDiskImage, BootDiskImage, AtariDosFile, XexContainerSegment, AtariDiskImage
 from .spartados import SpartaDosDiskImage
 from .cartridge import AtariCartImage, get_known_carts
 from .mame import MameZipImage
@@ -118,6 +118,11 @@ class AtariBootDiskSegmentParser(SegmentParser):
     image_type = BootDiskImage
 
 
+class AtariUnidentifiedSegmentParser(SegmentParser):
+    menu_name = "Atari Disk Image"
+    image_type = AtariDiskImage
+
+
 class XexSegmentParser(SegmentParser):
     menu_name = "XEX (Atari 8-bit executable)"
     image_type = AtariDosFile
@@ -202,6 +207,7 @@ mime_parsers = {
         SpartaDosSegmentParser,
         AtariDosSegmentParser,
         AtariBootDiskSegmentParser,
+        AtariUnidentifiedSegmentParser,
         ],
     "application/vnd.atari8bit.xex": [
         XexSegmentParser,