git.rot13.org Git - goodfet/blob - client/goodfet.maxusbmass

   1 #!/usr/bin/env python
   2
   3 #USB Mass Storage Emulator
   4 #by Travis Goodspeed
   5 #with thanks to Brandon Wilson and his Linky project.
   6
   7 import sys;
   8 import binascii;
   9 import array;
  10 import time;
  11
  12 from GoodFETMAXUSB import *;
  13
  14 class GoodFETMAXUSBMass(GoodFETMAXUSBDevice):
  15     """This emulates a USB Mass Storage device."""
  16
  17     #Too much data to watch everything.
  18     usbverbose=False;
  19
  20     def getSectorData(self,lba):
  21         """Overload this to return data from a given 512-byte sector."""
  22         print "You forgot to overload getSectorData().  Returning something neighborly.";
  23         sector=[
  24             0xE9, 0x86, 0x00, 0x0A, 0x47, 0x6F, 0x6F, 0x64, 0x44, 0x69, 0x73, 0x6B, 0x20, 0x30, 0x2E, 0x30,
  25             0x31, 0x0A, 0x0D, 0x62, 0x79, 0x20, 0x54, 0x72, 0x61, 0x76, 0x69, 0x73, 0x20, 0x47, 0x6F, 0x6F,
  26             0x64, 0x73, 0x70, 0x65, 0x65, 0x64, 0x0A, 0x0A, 0x0D, 0x00, 0x59, 0x6F, 0x75, 0x20, 0x68, 0x61,
  27             0x76, 0x65, 0x20, 0x62, 0x65, 0x65, 0x6E, 0x20, 0x65, 0x61, 0x74, 0x65, 0x6E, 0x20, 0x62, 0x79,
  28             0x20, 0x61, 0x20, 0x67, 0x72, 0x75, 0x65, 0x2E, 0x20, 0x20, 0x53, 0x6F, 0x72, 0x72, 0x79, 0x2E,
  29             0x0A, 0x0D, 0x00, 0x31, 0x29, 0x20, 0x52, 0x65, 0x61, 0x64, 0x69, 0x6E, 0x67, 0x20, 0x6B, 0x65,
  30             0x72, 0x6E, 0x65, 0x6C, 0x20, 0x66, 0x72, 0x6F, 0x6D, 0x20, 0x64, 0x69, 0x73, 0x6B, 0x2E, 0x0A,
  31             0x0D, 0x00, 0x32, 0x29, 0x20, 0x45, 0x78, 0x65, 0x63, 0x75, 0x74, 0x69, 0x6E, 0x67, 0x20, 0x6B,
  32             0x65, 0x72, 0x6E, 0x65, 0x6C, 0x2E, 0x0A, 0x0D, 0x00, 0xBE, 0x03, 0x7C, 0xE8, 0x41, 0x00, 0xE8,
  33             0x7B, 0x00, 0x31, 0xC0, 0x30, 0xD2, 0xCD, 0x13, 0x0F, 0x82, 0xE8, 0x00, 0xBE, 0x53, 0x7C, 0xE8,
  34             0x2E, 0x00, 0xB8, 0xE0, 0x07, 0x8E, 0xC0, 0x31, 0xDB, 0xB8, 0x10, 0x02, 0xB5, 0x00, 0xB1, 0x02,
  35             0xB6, 0x00, 0xB2, 0x00, 0xCD, 0x13, 0x0F, 0x82, 0xCA, 0x00, 0xB8, 0x00, 0x7E, 0x89, 0xC6, 0xE8,
  36             0x7C, 0x00, 0xBE, 0x72, 0x7C, 0xE8, 0x08, 0x00, 0xEA, 0x00, 0x00, 0xE0, 0x07, 0xE8, 0xB4, 0x00,
  37             0xAC, 0x3C, 0x00, 0x74, 0x06, 0xB4, 0x0E, 0xCD, 0x10, 0xEB, 0xF5, 0xC3, 0x30, 0x78, 0x00, 0x20,
  38             0x62, 0x79, 0x74, 0x65, 0x73, 0x20, 0x6F, 0x66, 0x20, 0x6D, 0x65, 0x6D, 0x6F, 0x72, 0x79, 0x20,
  39             0x64, 0x65, 0x74, 0x65, 0x63, 0x74, 0x65, 0x64, 0x2E, 0x0A, 0x0D, 0x00, 0x53, 0x65, 0x67, 0x6D,
  40             0x65, 0x6E, 0x74, 0x73, 0x3A, 0x20, 0x00, 0x2C, 0x20, 0x00, 0x0A, 0x0D, 0x00, 0xBE, 0xDC, 0x7C,
  41             0xE8, 0xBD, 0xFF, 0xE8, 0x63, 0x00, 0xE8, 0x07, 0x00, 0xBE, 0xDF, 0x7C, 0xE8, 0xB1, 0xFF, 0xC3,
  42             0x89, 0xC3, 0xC1, 0xE8, 0x0C, 0xE8, 0x39, 0x00, 0x89, 0xD8, 0xC1, 0xE8, 0x08, 0xE8, 0x31, 0x00,
  43             0x89, 0xD8, 0xC1, 0xE8, 0x04, 0xE8, 0x29, 0x00, 0x89, 0xD8, 0xE8, 0x24, 0x00, 0xC3, 0x31, 0xC9,
  44             0xAD, 0xE8, 0xDC, 0xFF, 0xE8, 0x2C, 0x00, 0x83, 0xC1, 0x02, 0x81, 0xF9, 0x00, 0x02, 0x75, 0xF0,
  45             0xC3, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45,
  46             0x46, 0x50, 0x56, 0x83, 0xE0, 0x0F, 0x05, 0x51, 0x7D, 0x89, 0xC6, 0xAC, 0xB4, 0x0E, 0xCD, 0x10,
  47             0x5E, 0x58, 0xC3, 0xB8, 0x20, 0x0E, 0xCD, 0x10, 0xC3, 0x31, 0xC0, 0xCD, 0x12, 0x72, 0x05, 0x85,
  48             0xC0, 0x74, 0x01, 0xC3, 0xBE, 0x2A, 0x7C, 0xE8, 0x46, 0xFF, 0xEB, 0xFE, 0xEA, 0x00, 0x00, 0xFF,
  49             0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  50             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  51             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  52             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  53             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  54             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  55             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xAA
  56             ];
  57         return sector;
  58     def putSectorData(self,lba,block):
  59         """Overload this to write data to a given 512-byte sector."""
  60         print "You forgot to overload putSectorData().  Ignoring sector write.";
  61         return;
  62
  63     def getSectorCount(self):
  64         """Returns the number of viable Logical Block Addresses."""
  65         print "You forgot to overload getSectorCount().  Guessing 0x200.";
  66         return 0x200;
  67
  68     def massinit(self):
  69         """Initialize a USB Mass Storage device."""
  70         self.usb_disconnect();
  71         time.sleep(1);
  72         self.usb_connect();
  73         self.massrun();
  74
  75     def massrun(self):
  76         """Main loop of the USB Mass Storage emulator."""
  77         print "Starting a Mass Storage device.";
  78         while 1:
  79             sys.stdout.flush();
  80             self.service_irqs();
  81     def do_SETUP(self):
  82         """Handle USB Enumeration"""
  83
  84         #Grab the SETUP packet from the buffer.
  85         SUD=self.readbytes(rSUDFIFO,8);
  86
  87         #Parse the SETUP packet
  88         print "Handling a setup packet of %s" % self.setup2str(SUD);
  89         setuptype=(ord(SUD[bmRequestType])&0x60);
  90         if setuptype==0x00:
  91             self.std_request(SUD);
  92         elif setuptype==0x20:
  93             self.class_request(SUD);
  94         elif setuptype==0x40:
  95             self.vendor_request(SUD);
  96         else:
  97             print "Unknown bmRequestType=0x%02x." % ord(SUD[bmRequestType])
  98             self.STALL_EP0(SUD);
  99     def class_request(self,SUD):
 100         """Handle a class request."""
 101         requesttype=ord(SUD[bmRequestType]);
 102         request=ord(SUD[bRequest]);
 103         if requesttype==0xA1 and request==0xFE:
 104             print "Reporting 0 as the maximum LUN.";
 105             #This is a Get Max LUN request.
 106             #Return 1-byte maximum Logical Unit Number
 107             self.wreg(rEP0FIFO,0x00); # Just one LUN.
 108             self.wregAS(rEP0BC,1); # ARM and fire!
 109             return; #Don't stall.
 110         if requesttype==0x21 and request==0xff:
 111             print "Received BBB reset."
 112             self.wregAS(rEP0BC,0); # ARM and fire!
 113             return; #Don't stall.
 114         print "Stalling an unknown class request: %s" % self.setup2str(SUD);
 115         self.STALL_EP0(SUD);
 116     def vendor_request(self,SUD):
 117         """Handle a vendor request."""
 118         request=ord(SUD[bRequest]);
 119         print "Why the hell is there a vendor request?";
 120         #self.wreg(rEP0FIFO,0);
 121         self.wregAS(rEP0BC,0);
 122     def std_request(self,SUD):
 123         """Handles a standard setup request."""
 124         setuptype=ord(SUD[bRequest]);
 125         if setuptype==SR_GET_DESCRIPTOR: self.send_descriptor(SUD);
 126         #elif setuptype==SR_SET_FEATURE: self.feature(1);
 127         elif setuptype==SR_SET_CONFIGURATION: self.set_configuration(SUD);
 128         elif setuptype==SR_GET_STATUS: self.get_status(SUD);
 129         elif setuptype==SR_SET_ADDRESS: self.rregAS(rFNADDR);
 130         elif setuptype==SR_GET_INTERFACE: self.get_interface(SUD);
 131         else:
 132             #print "Stalling Unknown standard setup request type %02x" % setuptype;
 133             #self.STALL_EP0(SUD);
 134             print "Accepting unknown standard setup request type %02x" % setuptype;
 135             self.wregAS(rEP0BC,0);
 136
 137     def get_interface(self,SUD):
 138         """Handles a setup request for SR_GET_INTERFACE."""
 139         if ord(SUD[wIndexL]==0):
 140             self.wreg(rEP0FIFO,0);
 141             self.wregAS(rEP0BC,1);
 142         else:
 143             self.STALL_EP0(SUD);
 144
 145
 146
 147 #Device Descriptor
 148     DD=[
 149
 150     0x12, #length
 151     0x01, 0x00, 0x02, 0x00, 0x00, 0x00, 0x40,
 152     0x81, 0x07, #Sandisk
 153     0x50, 0x51, #SDCZ2 Cruzer Mini Flash Drive (thin)
 154     0x00, 0x03,
 155     0x01, 0x02, 0x03, #Strings
 156     0x01
 157
 158     ];
 159
 160 #Configuration Descriptor
 161     CD=[
 162
 163   0x09, #Length
 164   0x02, #Type
 165   0x20, #Total Length
 166   0x00, 0x01, 0x01, 0x00, 0xE0, 0x00, 0x09, 0x04, 0x00, 0x00,
 167   0x02, #Num Endpoints
 168   0x08, #Mass Storage Bulk Only
 169   0x06, #SCSI
 170   0x50, 0x00,
 171
 172   #OUT EP1
 173   0x07, 0x05, 0x01, 0x02, 0x40, 0x00, 0x00,
 174   #IN EP3
 175   0x07, 0x05, 0x83, 0x02, 0x40, 0x00, 0x00,
 176
 177 ];
 178     strDesc=[
 179 # STRING descriptor 0--Language string
 180 "\x04\x03\x09\x04",
 181 # [
 182 #         0x04,                 # bLength
 183 #       0x03,                   # bDescriptorType = string
 184 #       0x09,0x04               # wLANGID(L/H) = English-United Sates
 185 # ],
 186 # STRING descriptor 1--Manufacturer ID
 187 "\x10\x03G\x00o\x00o\x00d\x00F\x00E\x00T\x00",
 188 # STRING descriptor 2 - Product ID
 189 "\x1C\x03M\x00A\x00S\x00S\x00 \x00E\x00m\x00u\x00l\x00a\x00t\x00o\x00r\x00",
 190 # STRING descriptor 3 - Serial Number ID
 191 "\x14\x03S\x00/\x00N\x00 \x003\x004\x002\x000\x00E\x00"
 192 ];
 193
 194     def get_status(self,SUD):
 195         """Get the USB Setup Status."""
 196         testbyte=ord(SUD[bmRequestType])
 197
 198         #Toward Device
 199         if testbyte==0x80:
 200             self.wreg(rEP0FIFO,0x03); #Enable RWU and self-powered
 201             self.wreg(rEP0FIFO,0x00); #Second byte is always zero.
 202             self.wregAS(rEP0BC,2);    #Load byte count, arm transfer, and ack CTL.
 203         #Toward Interface
 204         elif testbyte==0x81:
 205             self.wreg(rEP0FIFO,0x00);
 206             self.wreg(rEP0FIFO,0x00); #Second byte is always zero.
 207             self.wregAS(rEP0BC,2);
 208         #Toward Endpoint
 209         elif testbyte==0x82:
 210             if(ord(SUD[wIndexL])==0x83):
 211                 print "This code almost certainly doesn't work.";
 212                 self.wreg(rEP0FIFO,0x01); #Stall EP3
 213                 self.wreg(rEP0FIFO,0x00); #Second byte is always zero.
 214                 self.wregAS(rEP0BC,2);
 215             else:
 216                 print "Stalling unknown status.";
 217                 self.STALL_EP0(SUD);
 218         else:
 219             print "Stalling unknown status.";
 220             self.STALL_EP0(SUD);
 221
 222     def do_IN3(self):
 223         """Handle IN3 input event."""
 224         # Do nothing here, as it'll be taken care of elsewhere.  The
 225         # interrupt just means that the buffer is empty, not that we
 226         # are expected to fill it.
 227
 228     def do_OUT1(self):
 229         """Handle an OUT1 output event."""
 230         l=self.rreg(rEP1OUTBC);
 231         frame=self.readbytes(rEP1OUTFIFO,l);
 232         self.handleCBW(frame);
 233
 234     lastCBW="";
 235     def handleCBW(self,cbw):
 236         """Handles an incoming Command Block Wrapper.  See USB Mass
 237         Storage Class for details."""
 238
 239         if len(cbw)!=31:
 240             print "Invalid CBW length of %i bytes.  Aborting." % len(cbw);
 241             return;
 242         sig=cbw[0:4];
 243         if sig!="USBC":
 244             print "Invalid CBW signature: %s.  Should be USBC; aborting." % sig;
 245             return;
 246         self.lastCBW=cbw;
 247
 248         dtlen=ord(cbw[8])+(ord(cbw[9])<<8)+(ord(cbw[10])<<16)+(ord(cbw[11])<<24);
 249         flags=ord(cbw[12]);
 250         dtdir=flags&0x80; # 0x80 for dev->host, 0x00 for host->dev
 251         lun=ord(cbw[13])&0x0F; # Should be zero, as we only reported one LUN.
 252         cblen=ord(cbw[14])&0x1F;
 253         cb=cbw[15:31];
 254         self.handleCB(cb,cblen,dtlen,dtdir);
 255
 256     def handleCB(self,cb,cblen,dtlen,dtdir):
 257         """Handles a command block, then replies with a CSW."""
 258         if self.usbverbose:
 259             print "Got command block, type 0x%02x requesting 0x%02x bytes" % (
 260                 ord(cb[0]), dtlen);
 261         verb=ord(cb[0]);
 262         status=00; #good, set to 1 for bad.
 263         if verb==0x00: # Test Unit Ready
 264             # Send nothing, just the success code.
 265             status=0;
 266         elif verb==0x03: # Request Sense
 267             print "Responding to Request Sense.  Needed for Macs.";
 268             response=[0x70, 0x00, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x0A,
 269                       0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00,
 270                       0x00, 0x00,
 271                       0,0,0,0,0];
 272             #status=1;
 273             self.writebytes(rEP3INFIFO,
 274                             response);
 275             self.wreg(rEP3INBC,len(response));
 276         elif verb==0x12: #Inquiry
 277             #print "Responding to CB inquiry.";
 278             response=[
 279                 0x00, # 00 for Direct, 1F for "no floppy"
 280                 0x80, # make 0x80 for removable media
 281                 0x00, # Version
 282                 0x01, # Response Data Format
 283                 0x1f, #Additional length.
 284                 0x00, 0x00, 0x00,
 285                 #Manufacturer
 286                 ord('G'),ord('o'),ord('o'),ord('d'),ord('F'),ord('E'),ord('T'),0x20,
 287                 #Device name
 288                 ord('G'),ord('o'),ord('o'),ord('d'),ord('F'),ord('E'),ord('T'),0x20,
 289                 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
 290                 ord('0'),ord('.'),ord('0'),ord('1')]
 291             #print "Sending %i byte reply to %i byte query." % (
 292             #        len(response),dtlen);
 293             #while not(self.rreg(rEPIRQ)&bmIN3BAVIRQ):
 294             #    #Wait for the packet to complete before sending the next.
 295             #    print "Waiting to complete inquiry."
 296             #    pass;
 297             self.writebytes(rEP3INFIFO,
 298                             response);
 299             self.wregAS(rEP3INBC,
 300                         dtlen);
 301                         #len(response));
 302             #self.wreg(rEPIRQ,bmIN3BAVIRQ); #Clear the bit
 303             #while not(self.rreg(rEPIRQ)&bmIN3BAVIRQ):
 304             #    #Wait for the packet to complete before sending the next.
 305             #    print "Waiting to complete inquiry."
 306             #    pass;
 307         elif verb==0x1e: #Prevent/Allow Removal
 308             # Give a good status to pretend we understand.
 309             status=0x00;
 310         elif verb==0x1A: #Mode Sense (6)
 311             # I should probably send six bytes here.
 312             response=[0x12,0,0,0, 0,0,0,0x1C];
 313             self.writebytes(rEP3INFIFO,
 314                             response);
 315             self.wregAS(rEP3INBC,
 316                         len(response));
 317         elif verb==0x23: #Read Format Capacity
 318             response=[
 319                 0x00, 0,0x00,0x08, #Capacity list length.
 320                 0,0x00,0x10,0x00,   # Number of sectors, implying 10MB.
 321                 0x01,0x00,            #reserved/desciptor code.
 322                 0x02,0x00             # 512 bytes/sector.  Why is this twice?
 323                 ];
 324             self.writebytes(rEP3INFIFO,
 325                             response);
 326             self.wregAS(rEP3INBC,
 327                         len(response));
 328         elif verb==0x25: #Read Capacity
 329             lastlba=self.getSectorCount();
 330             response=[
 331                 #0x00, 0, 0x0f, 0xFF, # Last LBA
 332                 (lastlba>>24)&0xFF, (lastlba>>16)&0xFF, (lastlba>>8)&0xFF, lastlba&0xFF, # Last LBA
 333                 0x00,0x00,0x02,0x00   # Block length of 512 bytes.
 334                 ];
 335             self.writebytes(rEP3INFIFO,
 336                             response);
 337             self.wregAS(rEP3INBC,
 338                         len(response));
 339         elif verb==0x28: #READ SECTOR
 340             cbw=self.lastCBW;
 341             baselba=(
 342                 ord(cbw[20]) |
 343                 (ord(cbw[19])<<8) |
 344                 (ord(cbw[18])<<16) |
 345                 (ord(cbw[17])<<24)
 346                 );
 347             count=dtlen/512;
 348             print "Fetching %i blocks starting at  LBA %i." % (count,baselba);
 349             if count>32:
 350                 count=0;
 351                 status=1; #Fail if we're asked to read more than 32 blocks.
 352                 #Now we need to stall EP3.  It's not acceptable to just forget to transmit.
 353                 self.wreg(rEPSTALLS,0x10);
 354             for i in range(0,count):
 355                 data=self.getSectorData(baselba+i);
 356                 for j in range(0,8):
 357                     #print "Sending block fragment %i,%i" % (i,j);
 358                     #Transmit each 64-byte block fragment, then wait for next.
 359                     while not(self.rreg(rEPIRQ)&bmIN3BAVIRQ): pass;
 360                     response=data[j*64:j*64+64];
 361                     self.writebytes(rEP3INFIFO,
 362                                     response);
 363                     self.wregAS(rEP3INBC,
 364                                 64);
 365             #sys.exit();
 366         elif verb==0x2A: #WRITE SECTOR
 367             print "Haven't implemented WRITE SECTOR.";
 368             #sys.exit();
 369         else:
 370             print "ERROR: Unknown SCSI command block verb %02x." % verb;
 371             status=1; #Command Failed
 372             if dtlen>0:
 373                 print "Perhaps I should send %i bytes of dummy data here." % dtlen;
 374             sys.exit(1);
 375         cbw=self.lastCBW;
 376
 377         #Now we need to send the CSW.
 378         csw=[
 379             #Standard prefix.
 380             ord('U'),ord('S'),ord('B'),ord('S'),
 381             #CBW key; must be the same as the one we're replying to.
 382             ord(cbw[4]),ord(cbw[5]),ord(cbw[6]),ord(cbw[7]),
 383             #CSW Data Residue, probably oughtn't be zeroed.
 384             0,0,0,0,
 385             #Status byte: 00 for good, 01 for bad.
 386             status];
 387         self.writebytes(rEP3INFIFO,
 388                         csw);
 389         self.wregAS(rEP3INBC,len(csw));
 390
 391
 392         return;
 393
 394 class GoodFETMAXUSBMassFile(GoodFETMAXUSBMass):
 395     """This emulates a USB Mass Storage Device, providing a file as
 396     its image.  Writes are not yet supported, and this is very slow.
 397     Performance hacks will come after the code stabilizes."""
 398
 399     datafile=None;
 400     datafilelen=None;
 401     def openImage(self,filename):
 402         """Opens an image for use.  Call this *before* massinit()."""
 403         self.datafile=open(filename,"rb");
 404         print "Opened an image with %i blocks." % self.getSectorCount();
 405     def putSectorData(self,lba,block):
 406         """Writes a 512-byte sector to the lba address."""
 407         print "Writes aren't yet supported.";
 408         return;
 409
 410     def getSectorData(self,lba):
 411         """Returns data from a 512-byte sector."""
 412         toret="";
 413
 414         #Seek to the appropraite block.
 415         #print "Seeking to position %i"% (lba*512)
 416         self.datafile.seek(lba*512,0);
 417         pos=self.datafile.tell();
 418         if pos!=lba*512:
 419             print "SEEK ERROR: Seeked to %i (lba=%i), but now I'm at %i (lba=%i)" % (
 420                 lba*512,lba,
 421                 pos,pos/512);
 422             #sys.exit();
 423
 424         #Dump the data out, assuming no blocking and filling with nonsense.
 425         toret=self.datafile.read(512);
 426         if len(toret)<512:
 427             print "Holy hell, I only have %i bytes of 512." % len(toret);
 428
 429         toretbytes=range(0,len(toret));
 430         for b in range(0,len(toret)): toretbytes[b]=ord(toret[b]);
 431         return toretbytes;
 432
 433     def getSectorCount(self):
 434         """Returns the number of viable Logical Block Addresses."""
 435
 436         # Python must have a better way to read a file length, but for
 437         # now we just read the whole damned thing and then throw it
 438         # away.  With present performance, we can't read anything
 439         # large enough for this to be a problem.
 440         if self.datafilelen==None:
 441             self.datafile.seek(0);
 442             self.datafilelen=len(self.datafile.read());
 443         if self.datafilelen%512!=0:
 444             print "ERROR: Image does not have an integer number of blocks!"
 445             print "%i \% 512 == %i" % (self.datafilelen,
 446                                        self.datafilelen%512);
 447             sys.exit();
 448         return self.datafilelen/512-1;
 449 if(len(sys.argv)==1):
 450     print "Usage: %s disk.img\n" % sys.argv[0];
 451     sys.exit();
 452
 453
 454 #Initialize FET and set baud rate
 455 client=GoodFETMAXUSBMassFile();
 456 client.serInit()
 457
 458 client.openImage(sys.argv[1]);
 459
 460 client.MAXUSBsetup();
 461 client.massinit();
 462