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author | Michael Brown | 2009-04-16 04:15:08 +0200 |
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committer | Michael Brown | 2009-04-16 04:15:08 +0200 |
commit | 7741546a406217827c3d4a8d72aaa322b2565c35 (patch) | |
tree | a871a7879a035e76ae17cc096dc5317e4d8f400c /src/util/padimg.pl | |
parent | [dhcp] Accept filename via DHCP option 67 as well as BOOTP filename field (diff) | |
download | ipxe-7741546a406217827c3d4a8d72aaa322b2565c35.tar.gz ipxe-7741546a406217827c3d4a8d72aaa322b2565c35.tar.xz ipxe-7741546a406217827c3d4a8d72aaa322b2565c35.zip |
[build] Pad .rom, .dsk, and .hd images to 512-byte boundaries
QEMU will silently round down a disk or ROM image file to the nearest
512 bytes. Fix by always padding .rom, .dsk and .hd images to the
nearest 512-byte boundary.
Originally-fixed-by: Stefan Hajnoczi <stefanha@gmail.com>
Diffstat (limited to 'src/util/padimg.pl')
-rwxr-xr-x | src/util/padimg.pl | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/util/padimg.pl b/src/util/padimg.pl new file mode 100755 index 00000000..f3dcbbc3 --- /dev/null +++ b/src/util/padimg.pl @@ -0,0 +1,44 @@ +#!/usr/bin/perl -w + +use strict; +use warnings; +use Getopt::Long; +use Fcntl; + +my $verbosity = 0; +my $blksize = 512; +my $byte = 0; + +my $opts = { + 'verbose|v+' => sub { $verbosity++; }, + 'quiet|q+' => sub { $verbosity--; }, + 'blksize|s=o' => sub { $blksize = $_[1]; }, + 'byte|b=o' => sub { $byte = $_[1]; }, +}; + +Getopt::Long::Configure ( 'bundling', 'auto_abbrev' ); +GetOptions ( { map { /^(\w+)/; $1 => $opts->{$_} } keys %$opts }, keys %$opts ) + or die "Could not parse command-line options\n"; + +while ( my $filename = shift ) { + die "$filename is not a file\n" unless -f $filename; + my $oldsize = -s $filename; + my $newsize = ( ( $oldsize + $blksize - 1 ) & ~( $blksize - 1 ) ); + my $padsize = ( $newsize - $oldsize ); + next unless $padsize; + if ( $verbosity >= 1 ) { + printf "Padding %s from %d to %d bytes with %d x 0x%02x\n", + $filename, $oldsize, $newsize, $padsize, $byte; + } + if ( $byte ) { + sysopen ( my $fh, $filename, ( O_WRONLY | O_APPEND ) ) + or die "Could not open $filename for appending: $!\n"; + syswrite $fh, ( chr ( $byte ) x $padsize ) + or die "Could not append to $filename: $!\n"; + close ( $fh ); + } else { + truncate $filename, $newsize + or die "Could not resize $filename: $!\n"; + } + die "Failed to pad $filename\n" unless -s $filename == $newsize; +} |