#!/usr/bin/perl
#Generate a .c source that preinitializes a coffee file system
#David Kopf <dak664@embarqmail.com> July 2009
#For coffee file_header structure of
#struct file_header {
# coffee_page_t log_page;
# uint16_t log_records;
# uint16_t log_record_size;
# coffee_page_t max_pages;
# uint8_t deprecated_eof_hint;
# uint8_t flags;
# char name[COFFEE_NAME_LENGTH];
# } __attribute__((packed));

goto DEFAULTS;
START:$version="1.0 dak";

#Process options
for($n=0;$n<=$#ARGV;$n++) {
  $arg=$ARGV[$n];
  if ($arg eq "-p") {
    $n++;$coffee_page_length=$ARGV[$n];
  } elsif ($arg eq "-s") {
    $n++;$coffee_sector_size=$ARGV[$n];
  } elsif ($arg eq "-t") {
    $n++;$coffee_page_t     =$ARGV[$n];
  } elsif ($arg eq "-f") {
    $n++;$coffee_name_length=$ARGV[$n];
   } elsif ($arg eq "-S") {
    $n++;$sectionname=$ARGV[$n];
  } elsif ($arg eq "-c") {
    $complement=1;
  } elsif ($arg eq "-l") {
    $linkedlist=1;
  } elsif ($arg eq "-v") {
    print "avr-makecoffeedata Version $version\n";
  } elsif ($arg eq "-d") {
    $n++;$directory=$ARGV[$n];
  } elsif ($arg eq "-o") {
    $n++;$outputfile=$ARGV[$n];
  } else {
DEFAULTS:
#Set up defaults
$coffee_page_length=256;
$coffee_sector_size=256;
$coffee_page_t=1;
$coffee_name_length=16;
$complement=0;
$directory="";
$outputfile="httpd-fsdata.c";
$linkedlist=0;
$sectionname=".coffeefiles";
if (!$version) {goto START;}
    print "\n";
    print "Usage: avr-makecoffeedata <option(s)> <-d input_directory> <-o output_file>\n";
    print " Generates c source file to make a pre-initialized coffee file system\n";
    print " The default output file is $outputfile\n";
    print " The input directory structure is copied. If input_directory is specified\n";
    print " it becomes the root \"/\". If no input_directory is specified the first\n";
    print " subdirectory found in the current directory is used as the root.\n";
    print " WARNING : If the output file exists it will be overwritten without confirmation\n\n";
    print " Options are:\n";
    print " -p pagesize      Page size in bytes (default $coffee_page_length)\n";
    print " -s sectorsize    Sector size in bytes (default $coffee_sector_size)\n";
    print " -t page_t        Number of bytes in coffee_page_t (1,2,or 4, default $coffee_page_t)\n";
    print " -f namesize      File name field size in bytes (default $coffee_name_length)\n";
    print " -S section       Section name (default $sectionname)\n";
    print " -c               Complement the data, useful when flash is all 1s after erase\n";
    print " -l               Append a linked list of the file starting addresses\n";
    print " -v               Display the version number\n";
    exit;
  }
}

#printf "coffee_page_length=$coffee_page_length\n";
#printf "coffee_page_t=$coffee_page_t\n";
#printf "coffee_name_length=$coffee_name_length\n";
#printf "complement=$complement\n";
#printf "directory=$directory\n";
#printf "outputfile=$outputfile\n";
#printf "sectionname=$sectionname;

if ($coffee_page_t==1) {
  $coffeemax=0xff;
} elsif ($coffee_page_t==2) {
  $coffeemax=0xffff;
} elsif ($coffee_page_t==4) {
  $coffeemax=0xffffffff;
} else {
  die "Unsupported coffee_page_t $coffee_page_t\n";
}
$coffee_header_length=2*$coffee_page_t+$coffee_name_length+6;
$null="0x00";if ($complement) {$null="0xff";}
#$tab="/t";   #optional tab string
$tab="  ";  #optional tabs or spaces at beginning of line, e.g. "\t\t"

if (!open(OUTPUT, "> $outputfile")) {die "Aborted: Could not create output file $outputfile";}
#awkward but could not figure out how to compare paths later unless the file exists -- dak
print(OUTPUT "\n");
close($outputfile);
use Cwd qw(abs_path);
if (!open(OUTPUT, "> $outputfile")) {die "Aborted: Could not create output file $outputfile";}
$outputfile=abs_path($outputfile);

if ($directory eq "") {
  opendir(DIR, ".");
  @files =  grep { !/^\./ && !/(CVS|~)/ } readdir(DIR);
  closedir(DIR);
  foreach $file (@files) {
    if(-d $file && $file !~ /^\./) {
      $directory=$file;
      break;
    }
  }
}
if ($directory eq "") {die "Aborted: No subdirectory in current directory";}
if (!chdir("$directory")) {die "Aborted: Directory \"$directory\" does not exist!";}

print "Processing directory $directory as root of coffee file system\n";
opendir(DIR, ".");
@files =  grep { !/^\./ && !/(CVS|~)/ } readdir(DIR);
closedir(DIR);

foreach $file (@files) {
  if(-d $file && $file !~ /^\./) {
    print "Adding subdirectory $file\n";
    opendir(DIR, $file);
    @newfiles =  grep { !/^\./ && !/(CVS|~)/ } readdir(DIR);
    closedir(DIR);
#   printf "Adding files @newfiles\n";
    @files = (@files, map { $_ = "$file/$_" } @newfiles);
    next;
  }
}

print "Writing to $outputfile\n";
print(OUTPUT "/**************Generated by /tools/avr-makecoffeedata*****************/\n");
print(OUTPUT "/*For coffee filesystem of sector size $coffee_sector_size and header length $coffee_header_length bytes*/\n");

$n=0;$coffeesize=0;$coffeesectors=0;
foreach $file (@files) {if(-f $file) {
  if (length($file)>($coffee_name_length-1)) {die "Aborted: File name $file is too long";}

  if (abs_path("$file") eq abs_path("$outputfile")) {
    print "Skipping $outputfile for recursive input\n";
    next;
  }
  print "Adding $file\n";
  
  open(FILE, $file) || die "Aborted: Could not open file $file\n";
  if (grep /.png/,$file) {binmode FILE;} 
  if (grep /.jpg/,$file) {binmode FILE;}
  if (grep /.gif/,$file) {binmode FILE;}
  
  $file =~ s-^-/-;
  $fvar = $file;
  $fvar =~ s-/-_-g;
  $fvar =~ s-\.-_-g;
  $file_length= -s FILE;
  $coffee_sectors=int(($coffee_header_length+$file_length+$coffee_sector_size-1)/$coffee_sector_size);
# $coffee_sectors=sprintf("%.0f",($coffee_header_length+$file_length+$coffee_sector_size-1)/$coffee_sector_size)-1;
  $coffee_length=$coffee_sectors*$coffee_sector_size;
  $flen[$n]=$file_length;
  $clen[$n]=$coffee_length;
  $n++;$coffeesectors+=$coffee_sectors;$coffeesize+=$coffee_length;
  if ($coffeesectors>$coffeemax) {
    print "Warning: sector number $coffeesectors overflows allocated sector size in coffee header\n";
  }
  print(OUTPUT "\n__attribute__ ((section (\"$sectionname\")))\n");
  print(OUTPUT "volatile const char data".$fvar."[$coffee_length] = {\n");
  print(OUTPUT "$tab/* $file */\n$tab ");
#--------------------Header-----------------------------
#log_page
  for($j=0;$j<$coffee_page_t;$j++) {print (OUTPUT "$null, ");}
#log_records, log_record_size
  for($j=0;$j<4;$j++) {print (OUTPUT "$null, ");}
#max_pages 
  if ($complement) {$coffee_sectors=$coffee_sectors^0xffffffff;}
  if ($coffee_page_t==1) {
    printf(OUTPUT "0x%2.2x, ",($coffee_sectors    )&0xff);
  } elsif ($coffee_page_t==2) {
    printf(OUTPUT "0x%2.2x, ",($coffee_sectors>> 8)&0xff);
    printf(OUTPUT "0x%2.2x, ",($coffee_sectors    )&0xff);
  } elsif ($coffee_page_t==4) {
    printf(OUTPUT "0x%2.2x, ",($coffee_sectors>>24)&0xff);
    printf(OUTPUT "0x%2.2x, ",($coffee_sectors>>16)&0xff);
    printf(OUTPUT "0x%2.2x, ",($coffee_sectors>> 8)&0xff);
    printf(OUTPUT "0x%2.2x, ",($coffee_sectors    )&0xff);
  }
  if ($complement) {$coffee_sectors=$coffee_sectors^0xffffffff;}
#eof hint and flags
  if ($complement) {
    print(OUTPUT "0xff, 0xfc,\n$tab");
  } else {
    print(OUTPUT "0x00, 0x03,\n$tab");
  }

#file name
  for($j = 0; $j < length($file); $j++) {
    $temp=unpack("C", substr($file, $j, 1));
    if ($complement) {$temp=$temp^0xff;}
    printf(OUTPUT " %#02.2x,", $temp);
  }
  for(; $j < $coffee_name_length; $j++) {printf(OUTPUT " $null,");}
  print(OUTPUT "\n$tab");
#------------------File Data---------------------------
  $coffee_length-=$coffee_header_length;
  $i = 0;        
  while(read(FILE, $data, 1)) { 
    $temp=unpack("C", $data);   
    if ($complement) {$temp=$temp^0xff;}
    printf(OUTPUT " 0x%2.2x,", $temp);
    $i++;$coffee_length--;
    if($i == 10) {
      print(OUTPUT "\n$tab");
      $i = 0;
    }
  }
  while (--$coffee_length>1) {
    print (OUTPUT " $null,");
    if($i++ == 9) {
      print(OUTPUT "\n$tab");
      $i = 0;
    }
  }
  print (OUTPUT " $null};\n");
  close(FILE);
  push(@fvars, $fvar);
  push(@pfiles, $file);
}}

if ($linkedlist) {
#-------------------httpd_fsdata_file links-------------------
#The non-coffee PROGMEM flash file system for the Raven webserver uses a linked flash list as follows:
print(OUTPUT "\n\n/* Structure of linked list (all offsets relative to start of section):\n");
print(OUTPUT "struct httpd_fsdata_file {\n");
print(OUTPUT "$tab const struct httpd_fsdata_file *next; //actual flash address of next link\n");
print(OUTPUT "$tab const char *name;                     //offset to coffee file name\n");
print(OUTPUT "$tab const char *data;                     //offset to coffee file data\n");
print(OUTPUT "$tab const int len;                        //length of file data\n");
print(OUTPUT "#if HTTPD_FS_STATISTICS == 1               //not enabled since list is in PROGMEM\n");
print(OUTPUT "$tab uint16_t count;                       //storage for file statistics\n");
print(OUTPUT "#endif\n");
print(OUTPUT "}\n*/\n");

# Note flash addresses above 0xffff require 32 bit pointers using pgm_read_byte_far,
# and the coffee file system is above that. So the addresses start from 0 which
# allows a 64K file system. The flash starting address is added in the read routine.

print(OUTPUT "\n#define HTTPD_FS_ROOT file$fvars[$i - 1]\n\n");

for($i = 0; $i < @fvars; $i++) {
    $file = $pfiles[$i];
    $fvar = $fvars[$i];
    if($i == 0) {
        $prevfile = "NULL";
        $data_offset=0;
    } else {
        $data_offset=$data_offset+$clen[$i-1];
        $prevfile = "file" . $fvars[$i - 1];
    }
    $filename_offset=$data_offset+6+2*$coffee_page_t;
    $coffee_offset=$data_offset+$coffee_header_length;
    if ($coffee_offset>0xffff) {print "Warning : Linked list offset field overflow\n";}

    print(OUTPUT "const struct httpd_fsdata_file");
    for ($t=length($file);$t<16;$t++) {print(OUTPUT " ")};
    # for AVR, add PROGMEM here
    print(OUTPUT " file".$fvar."[] PROGMEM={{");
    for ($t=length($prevfile);$t<20;$t++) {print(OUTPUT " ")};
    print(OUTPUT "$prevfile, ");
    printf(OUTPUT "(const char *)0x%4.4x, ",$filename_offset);
    printf(OUTPUT "(const char *)0x%4.4x, ",$coffee_offset);
    printf(OUTPUT "%5u}};\n",$flen[$i]);
}
print(OUTPUT "\n#define HTTPD_FS_NUMFILES $i\n");
}
print "All done, preallocated coffee files occupy $coffeesize bytes\n";