diff options
Diffstat (limited to 'ztest.cc')
| -rw-r--r-- | ztest.cc | 14 |
1 files changed, 9 insertions, 5 deletions
@@ -1,5 +1,5 @@ -/* Ztest - verify integrity of compressed files - Copyright (C) 2010-2016 Antonio Diaz Diaz. +/* Ztest - verify the integrity of compressed files + Copyright (C) 2010-2017 Antonio Diaz Diaz. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -56,8 +56,12 @@ void show_help() "input is verified. Data read from standard input must be all in the same\n" "compression format.\n" "\nThe supported formats are bzip2, gzip, lzip and xz.\n" - "\nNote that some xz files lack integrity information, and therefore can't\n" - "be verified as reliably as the other formats can.\n" + "\nNote that error detection in the xz format is broken. First, some xz\n" + "files lack integrity information. Second, not all xz decompressors can\n" + "verify the integrity of all xz files. Third, section 2.1.1.2 'Stream\n" + "Flags' of the xz format specification allows xz decompressors to produce\n" + "garbage output without issuing any warning. Therefore, xz files can't\n" + "always be verified as reliably as files in the other formats can.\n" "\nUsage: ztest [options] [files]\n" "\nExit status is 0 if all compressed files verify OK, 1 if environmental\n" "problems (file not found, invalid flags, I/O errors, etc), 2 if any\n" @@ -106,7 +110,7 @@ int ztest_stdin( const int infd, int format_index, if( pid == 0 ) // child1 (compressor feeder) { if( close( fda[0] ) != 0 || - !feed_data( infd, fda[1], magic_data, magic_size ) ) + !feed_data( "", infd, fda[1], magic_data, magic_size ) ) _exit( 1 ); if( close( fda[1] ) != 0 ) { show_close_error(); _exit( 1 ); } |