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-rw-r--r--zutils.cc123
1 files changed, 79 insertions, 44 deletions
diff --git a/zutils.cc b/zutils.cc
index 850504a..bf6fe9a 100644
--- a/zutils.cc
+++ b/zutils.cc
@@ -22,11 +22,13 @@
#include <cstdlib>
#include <cstring>
#include <string>
+#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <sys/wait.h>
#include "zutils.h"
+#include "rc.h"
const char * invocation_name = 0;
@@ -35,7 +37,7 @@ const char * util_name = program_name;
int verbosity = 0;
-int get_format_type( const std::string & arg )
+int parse_format_type( const std::string & arg )
{
for( int i = 0; i < num_formats; ++i )
if( arg == format_names[i] )
@@ -102,56 +104,90 @@ bool feed_data( const int infd, const int outfd,
}
-bool set_data_feeder( int * const infdp, pid_t * const pidp,
- const int format_type )
+bool good_status( const Children & children, const bool finished )
+ {
+ bool error = false;
+ for( int i = 0; i < 2; ++i )
+ {
+ const pid_t pid = children.pid[i];
+ if( pid )
+ {
+ const char * const msg =
+ ( i & 1 ) ? children.compressor_name : "data feeder";
+ if( !finished )
+ {
+ const int tmp = child_status( pid, msg );
+ if( tmp < 0 ) kill( pid, SIGTERM ); // child not terminated
+ else if( tmp != 0 ) error = true; // child status != 0
+ }
+ else
+ if( wait_for_child( pid, msg ) != 0 ) error = true;
+ }
+ }
+ return !error;
+ }
+
+
+bool set_data_feeder( int * const infdp, Children & children, int format_index )
{
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( format_index < 0 )
+ format_index = test_format( *infdp, &magic_data, &magic_size );
+ children.compressor_name = get_compressor_name( format_index );
- if( decompressor_name ) // compressed
+ if( children.compressor_name ) // compressed
{
int fda[2]; // pipe from feeder
- int fda2[2]; // pipe from decompressor
+ int fda2[2]; // pipe from compressor
if( pipe( fda ) < 0 || pipe( fda2 ) < 0 )
{ show_error( "Can't create pipe", errno ); return false; }
const int old_infd = *infdp;
*infdp = fda2[0];
const pid_t pid = fork();
- if( pid == 0 ) // child (decompressor feeder)
+ if( pid == 0 ) // child 1 (compressor feeder)
{
- const pid_t pid2 = fork();
- if( pid2 == 0 ) // grandchild (decompressor)
- {
- if( dup2( fda[0], STDIN_FILENO ) >= 0 &&
- dup2( fda2[1], STDOUT_FILENO ) >= 0 &&
- close( fda[0] ) == 0 && close( fda[1] ) == 0 &&
- close( fda2[0] ) == 0 && close( fda2[1] ) == 0 )
- execlp( decompressor_name, decompressor_name,
- (verbosity >= 0) ? "-d" : "-dq", (char *)0 );
- show_exec_error( decompressor_name );
- _exit( 2 );
- }
- if( pid2 < 0 )
- { show_fork_error( decompressor_name ); _exit( 2 ); }
-
if( close( fda[0] ) != 0 ||
close( fda2[0] ) != 0 || close( fda2[1] ) != 0 ||
!feed_data( old_infd, fda[1], magic_data, magic_size ) )
_exit( 2 );
if( close( fda[1] ) != 0 )
- { show_close_error( "decompressor feeder" ); _exit( 2 ); }
- _exit( wait_for_child( pid2, decompressor_name ) );
+ { show_close_error( "data feeder" ); _exit( 2 ); }
+ _exit( 0 );
+ }
+ if( pid < 0 ) // parent
+ { show_fork_error( "data feeder" ); return false; }
+
+ const pid_t pid2 = fork();
+ if( pid2 == 0 ) // child 2 (compressor)
+ {
+ if( dup2( fda[0], STDIN_FILENO ) >= 0 &&
+ dup2( fda2[1], STDOUT_FILENO ) >= 0 &&
+ close( fda[0] ) == 0 && close( fda[1] ) == 0 &&
+ close( fda2[0] ) == 0 && close( fda2[1] ) == 0 )
+ {
+ const std::vector< std::string > & compressor_args =
+ get_compressor_args( format_index );
+ const int size = compressor_args.size();
+ const char ** const argv = new const char *[size+3];
+ argv[0] = children.compressor_name;
+ for( int i = 0; i < size; ++i )
+ argv[i+1] = compressor_args[i].c_str();
+ argv[size+1] = ( verbosity >= 0 ) ? "-d" : "-dq";
+ argv[size+2] = 0;
+ execvp( argv[0], (char **)argv );
+ }
+ show_exec_error( children.compressor_name );
+ _exit( 2 );
}
- // parent
+ if( pid2 < 0 ) // parent
+ { show_fork_error( children.compressor_name ); return false; }
+
close( fda[0] ); close( fda[1] ); close( fda2[1] );
- if( pid < 0 )
- { show_fork_error( "decompressor feeder" ); return false; }
- *pidp = pid;
+ children.pid[0] = pid;
+ children.pid[1] = pid2;
}
- else // not compressed
+ else // uncompressed
{
int fda[2]; // pipe from feeder
if( pipe( fda ) < 0 )
@@ -168,11 +204,11 @@ bool set_data_feeder( int * const infdp, pid_t * const pidp,
{ show_close_error( "data feeder" ); _exit( 2 ); }
_exit( 0 );
}
- // parent
- close( fda[1] );
- if( pid < 0 )
+ if( pid < 0 ) // parent
{ show_fork_error( "data feeder" ); return false; }
- *pidp = pid;
+ close( fda[1] );
+ children.pid[0] = pid;
+ children.pid[1] = 0;
}
return true;
}
@@ -187,7 +223,7 @@ void show_help_addr()
void show_version( const char * const Util_name )
{
- if( !Util_name || !*Util_name )
+ if( !Util_name || !Util_name[0] )
std::printf( "%s %s\n", Program_name, PROGVERSION );
else
std::printf( "%s (%s) %s\n", Util_name, program_name, PROGVERSION );
@@ -256,9 +292,8 @@ void internal_error( const char * const msg )
}
-const char * test_format( const int infd,
- const uint8_t ** const magic_datap,
- int * const magic_sizep )
+int 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];
@@ -271,13 +306,13 @@ const char * test_format( const int infd,
if( readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == bzip2_magic[1] &&
readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == bzip2_magic[2] )
{ *magic_datap = bzip2_magic; *magic_sizep = bzip2_magic_size;
- return decompressor_names[fmt_bz2]; }
+ return fmt_bz2; }
}
else if( buf[0] == gzip_magic[0] )
{
if( readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == gzip_magic[1] )
{ *magic_datap = gzip_magic; *magic_sizep = gzip_magic_size;
- return decompressor_names[fmt_gz]; }
+ return fmt_gz; }
}
else if( buf[0] == lzip_magic[0] )
{
@@ -285,7 +320,7 @@ const char * test_format( const int infd,
readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == lzip_magic[2] &&
readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == lzip_magic[3] )
{ *magic_datap = lzip_magic; *magic_sizep = lzip_magic_size;
- return decompressor_names[fmt_lz]; }
+ return fmt_lz; }
}
else if( buf[0] == xz_magic[0] )
{
@@ -294,11 +329,11 @@ const char * test_format( const int infd,
readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == xz_magic[3] &&
readblock( infd, &buf[i], 1 ) == 1 && buf[i++] == xz_magic[4] )
{ *magic_datap = xz_magic; *magic_sizep = xz_magic_size;
- return decompressor_names[fmt_xz]; }
+ return fmt_xz; }
}
}
*magic_datap = buf; *magic_sizep = i;
- return 0;
+ return -1;
}