diff options
Diffstat (limited to 'zutils.cc')
| -rw-r--r-- | zutils.cc | 151 |
1 files changed, 88 insertions, 63 deletions
@@ -1,5 +1,5 @@ /* Zutils - Utilities dealing with compressed files - Copyright (C) 2009, 2010, 2011 Antonio Diaz Diaz. + Copyright (C) 2009, 2010, 2011, 2012, 2013 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 @@ -35,10 +35,20 @@ const char * util_name = program_name; int verbosity = 0; +int get_format_type( const std::string & arg ) + { + for( int i = 0; i < num_formats; ++i ) + if( arg == format_names[i] ) + return i; + show_error( "Bad argument for '--format' option." ); + std::exit( 1 ); + } + + // Returns the number of bytes really read. // If (returned value < size) and (errno == 0), means EOF was reached. // -int readblock( const int fd, uint8_t * const buf, const int size ) throw() +int readblock( const int fd, uint8_t * const buf, const int size ) { int rest = size; errno = 0; @@ -47,7 +57,7 @@ int readblock( const int fd, uint8_t * const buf, const int size ) throw() errno = 0; const int n = read( fd, buf + size - rest, rest ); if( n > 0 ) rest -= n; - else if( n == 0 ) break; + else if( n == 0 ) break; // EOF else if( errno != EINTR && errno != EAGAIN ) break; } return ( rest > 0 ) ? size - rest : size; @@ -57,7 +67,7 @@ int readblock( const int fd, uint8_t * const buf, const int size ) throw() // Returns the number of bytes really written. // If (returned value < size), it is always an error. // -int writeblock( const int fd, const uint8_t * const buf, const int size ) throw() +int writeblock( const int fd, const uint8_t * const buf, const int size ) { int rest = size; errno = 0; @@ -66,7 +76,7 @@ int writeblock( const int fd, const uint8_t * const buf, const int size ) throw( errno = 0; const int n = write( fd, buf + size - rest, rest ); if( n > 0 ) rest -= n; - else if( errno && errno != EINTR && errno != EAGAIN ) break; + else if( n < 0 && errno != EINTR && errno != EAGAIN ) break; } return ( rest > 0 ) ? size - rest : size; } @@ -75,7 +85,7 @@ int writeblock( const int fd, const uint8_t * const buf, const int size ) throw( bool feed_data( const int infd, const int outfd, const uint8_t * magic_data, const int magic_size ) { - if( writeblock( outfd, magic_data, magic_size ) != magic_size ) + if( magic_size && writeblock( outfd, magic_data, magic_size ) != magic_size ) { show_error( "Write error", errno ); return false; } enum { buffer_size = 4096 }; uint8_t buffer[buffer_size]; @@ -92,15 +102,16 @@ bool feed_data( const int infd, const int outfd, } -bool set_data_feeder( int * const infdp, pid_t * const pidp ) +bool set_data_feeder( int * const infdp, pid_t * const pidp, + const int format_type ) { - std::string file_type; - const uint8_t * magic_data; - int magic_size; - const bool compressed = - test_format( *infdp, file_type, &magic_data, &magic_size ); + const uint8_t * magic_data = 0; + int magic_size = 0; + const char * const decompressor_name = ( format_type >= 0 ) ? + decompressor_names[format_type] : + test_format( *infdp, &magic_data, &magic_size ); - if( compressed ) // compressed with `file_type' + if( decompressor_name ) // compressed { int fda[2]; // pipe from feeder int fda2[2]; // pipe from decompressor @@ -118,12 +129,13 @@ bool set_data_feeder( int * const infdp, pid_t * const pidp ) dup2( fda2[1], STDOUT_FILENO ) >= 0 && close( fda[0] ) == 0 && close( fda[1] ) == 0 && close( fda2[0] ) == 0 && close( fda2[1] ) == 0 ) - execlp( file_type.c_str(), file_type.c_str(), "-cdfq", (char *)0 ); - show_exec_error( file_type.c_str() ); + execlp( decompressor_name, decompressor_name, + (verbosity >= 0) ? "-d" : "-dq", (char *)0 ); + show_exec_error( decompressor_name ); _exit( 2 ); } if( pid2 < 0 ) - { show_fork_error( file_type.c_str() ); _exit( 2 ); } + { show_fork_error( decompressor_name ); _exit( 2 ); } if( close( fda[0] ) != 0 || close( fda2[0] ) != 0 || close( fda2[1] ) != 0 || @@ -131,7 +143,7 @@ bool set_data_feeder( int * const infdp, pid_t * const pidp ) _exit( 2 ); if( close( fda[1] ) != 0 ) { show_close_error( "decompressor feeder" ); _exit( 2 ); } - _exit( wait_for_child( pid2, file_type.c_str() ) ); + _exit( wait_for_child( pid2, decompressor_name ) ); } // parent close( fda[0] ); close( fda[1] ); close( fda2[1] ); @@ -166,28 +178,27 @@ bool set_data_feeder( int * const infdp, pid_t * const pidp ) } -void show_help_addr() throw() +void show_help_addr() { - std::printf( "\nReport bugs to zutils-bug@nongnu.org\n" ); - std::printf( "Zutils home page: http://www.nongnu.org/zutils/zutils.html\n" ); + std::printf( "\nReport bugs to zutils-bug@nongnu.org\n" + "Zutils home page: http://www.nongnu.org/zutils/zutils.html\n" ); } -void show_version( const char * const Util_name ) throw() +void show_version( const char * const Util_name ) { if( !Util_name || !*Util_name ) std::printf( "%s %s\n", Program_name, PROGVERSION ); else std::printf( "%s (%s) %s\n", Util_name, program_name, PROGVERSION ); std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year ); - std::printf( "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n" ); - std::printf( "This is free software: you are free to change and redistribute it.\n" ); - std::printf( "There is NO WARRANTY, to the extent permitted by law.\n" ); + std::printf( "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n" + "This is free software: you are free to change and redistribute it.\n" + "There is NO WARRANTY, to the extent permitted by law.\n" ); } -void show_error( const char * const msg, const int errcode, - const bool help ) throw() +void show_error( const char * const msg, const int errcode, const bool help ) { if( verbosity >= 0 ) { @@ -198,22 +209,22 @@ void show_error( const char * const msg, const int errcode, std::fprintf( stderr, ": %s", std::strerror( errcode ) ); std::fprintf( stderr, "\n" ); } - if( help && invocation_name && invocation_name[0] ) - std::fprintf( stderr, "Try `%s --help' for more information.\n", + if( help ) + std::fprintf( stderr, "Try '%s --help' for more information.\n", invocation_name ); } } -void show_error2( const char * const msg, const char * const name ) throw() +void show_error2( const char * const msg, const char * const name ) { if( verbosity >= 0 ) - std::fprintf( stderr, "%s: %s `%s': %s.\n", + std::fprintf( stderr, "%s: %s '%s': %s.\n", util_name, msg, name, std::strerror( errno ) ); } -void show_close_error( const char * const prog_name ) throw() +void show_close_error( const char * const prog_name ) { if( verbosity >= 0 ) std::fprintf( stderr, "%s: Can't close output of %s: %s.\n", @@ -221,18 +232,18 @@ void show_close_error( const char * const prog_name ) throw() } -void show_exec_error( const char * const prog_name ) throw() +void show_exec_error( const char * const prog_name ) { if( verbosity >= 0 ) - std::fprintf( stderr, "%s: Can't exec `%s': %s.\n", + std::fprintf( stderr, "%s: Can't exec '%s': %s.\n", util_name, prog_name, std::strerror( errno ) ); } -void show_fork_error( const char * const prog_name ) throw() +void show_fork_error( const char * const prog_name ) { if( verbosity >= 0 ) - std::fprintf( stderr, "%s: Can't fork `%s': %s.\n", + std::fprintf( stderr, "%s: Can't fork '%s': %s.\n", util_name, prog_name, std::strerror( errno ) ); } @@ -245,21 +256,13 @@ void internal_error( const char * const msg ) } -unsigned char xdigit( const int value ) throw() - { - if( value >= 0 && value <= 9 ) return '0' + value; - if( value >= 10 && value <= 15 ) return 'A' + ( value - 10 ); - return 0; - } - - -bool test_format( const int infd, std::string & file_type, - const uint8_t ** const magic_datap, int * const magic_sizep ) +const char * test_format( const int infd, + const uint8_t ** const magic_datap, + int * const magic_sizep ) { enum { buf_size = 5 }; static uint8_t buf[buf_size]; int i = 0; - file_type.clear(); if( readblock( infd, buf, 1 ) == 1 ) { ++i; @@ -267,22 +270,22 @@ bool test_format( const int infd, std::string & file_type, { if( readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == bzip2_magic[1] && readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == bzip2_magic[2] ) - { file_type = "bzip2"; - *magic_datap = bzip2_magic; *magic_sizep = bzip2_magic_size; } + { *magic_datap = bzip2_magic; *magic_sizep = bzip2_magic_size; + return decompressor_names[fmt_bz2]; } } else if( buf[0] == gzip_magic[0] ) { if( readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == gzip_magic[1] ) - { file_type = "gzip"; - *magic_datap = gzip_magic; *magic_sizep = gzip_magic_size; } + { *magic_datap = gzip_magic; *magic_sizep = gzip_magic_size; + return decompressor_names[fmt_gz]; } } else if( buf[0] == lzip_magic[0] ) { if( readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == lzip_magic[1] && readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == lzip_magic[2] && readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == lzip_magic[3] ) - { file_type = "lzip"; - *magic_datap = lzip_magic; *magic_sizep = lzip_magic_size; } + { *magic_datap = lzip_magic; *magic_sizep = lzip_magic_size; + return decompressor_names[fmt_lz]; } } else if( buf[0] == xz_magic[0] ) { @@ -290,18 +293,12 @@ bool test_format( const int infd, std::string & file_type, readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == xz_magic[2] && readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == xz_magic[3] && readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == xz_magic[4] ) - { file_type = "xz"; - *magic_datap = xz_magic; *magic_sizep = xz_magic_size; } + { *magic_datap = xz_magic; *magic_sizep = xz_magic_size; + return decompressor_names[fmt_xz]; } } } - if( file_type.size() ) return true; - for( int j = 0; j < i; ++j ) - { - file_type += xdigit( buf[j] >> 4 ); - file_type += xdigit( buf[j] & 0x0F ); - } *magic_datap = buf; *magic_sizep = i; - return false; + return 0; } @@ -314,10 +311,38 @@ int wait_for_child( const pid_t pid, const char * const name, if( errno != EINTR ) { if( verbosity >= 0 ) - std::fprintf( stderr, "%s: Error waiting termination of `%s': %s.\n", - util_name, name, std::strerror( errno ) ); + std::fprintf( stderr, "%s: Error waiting termination of '%s': %s.\n", + util_name, name, std::strerror( errno ) ); + _exit( eretval ); + } + } + + if( WIFEXITED( status ) ) + { + const int tmp = WEXITSTATUS( status ); + if( eretval == 1 && tmp == 1 ) return 2; // for ztest + return tmp; + } + return eretval; + } + + +int child_status( const pid_t pid, const char * const name, + const int eretval ) + { + int status; + while( true ) + { + const int tmp = waitpid( pid, &status, WNOHANG ); + if( tmp == -1 && errno != EINTR ) + { + if( verbosity >= 0 ) + std::fprintf( stderr, "%s: Error checking status of '%s': %s.\n", + util_name, name, std::strerror( errno ) ); _exit( eretval ); } + if( tmp == 0 ) return -1; // child not terminated + if( tmp == pid ) break; // child terminated } if( WIFEXITED( status ) ) return WEXITSTATUS( status ); |