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/* OS-specific IO functions for xcftools
*
* This file was written by Henning Makholm <henning@makholm.net>
* It is hereby in the public domain.
*
* In jurisdictions that do not recognise grants of copyright to the
* public domain: I, the author and (presumably, in those jurisdictions)
* copyright holder, hereby permit anyone to distribute and use this code,
* in source code or binary form, with or without modifications. This
* permission is world-wide and irrevocable.
*
* Of course, I will not be liable for any errors or shortcomings in the
* code, since I give it away without asking any compenstations.
*
* If you use or distribute this code, I would appreciate receiving
* credit for writing it, in whichever way you find proper and customary.
*/
#include "xcftools.h"
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#if HAVE_MMAP
#include <sys/mman.h>
#endif
static FILE *xcfstream = 0 ;
void
free_or_close_xcf(void)
{
if( xcf_file ) {
if( xcfstream ) {
munmap(xcf_file,xcf_length) ;
fclose(xcfstream);
xcf_file = 0 ;
xcfstream = 0 ;
} else {
free(xcf_file) ;
xcf_file = 0 ;
}
}
}
void
read_or_mmap_xcf(const char *filename,const char *unzipper)
{
struct stat statbuf ;
free_or_close_xcf() ;
if( strcmp(filename,"-") != 0 ) {
if( access(filename,R_OK) != 0 )
FatalGeneric(21,"!%s",filename);
}
if( !unzipper ) {
const char *pc ;
pc = filename + strlen(filename) ;
if( pc-filename > 2 && strcmp(pc-2,"gz") == 0 )
unzipper = "zcat" ;
else if ( pc-filename > 3 && strcmp(pc-3,"bz2") == 0 )
unzipper = "bzcat" ;
else
unzipper = "" ;
} else if( strcmp(unzipper,"cat") == 0 )
unzipper = "" ;
if( *unzipper ) {
int pid, status, outfd ;
#if HAVE_MMAP
xcfstream = tmpfile() ;
if( !xcfstream )
FatalUnexpected(_("!Cannot create temporary unzipped file"));
outfd = fileno(xcfstream) ;
#else
int fh[2] ;
if( pipe(fh) < 0 )
FatalUnexpected("!Cannot create pipe for %s",unzipper);
xcfstream = fdopen(fh[1],"rb") ;
if( !xcfstream )
FatalUnexpected("!Cannot fdopen() unzipper pipe");
outfd = fh[0] ;
#endif
if( (pid = fork()) == 0 ) {
/* We're the child */
if( dup2(outfd,1) < 0 ) {
perror("Cannot dup2 in unzip process");
exit(127) ;
}
fclose(xcfstream) ;
execlp(unzipper,unzipper,filename,NULL) ;
fprintf(stderr,_("Cannot execute "));
perror(unzipper);
exit(126) ;
}
#if HAVE_MMAP
while( wait(&status) != pid )
;
if( WIFEXITED(status) ) {
status = WEXITSTATUS(status) ;
if( status > 0 ) {
fclose(xcfstream) ;
xcfstream = 0 ;
FatalGeneric(status,NULL);
}
} else {
fclose(xcfstream) ;
xcfstream = 0 ;
FatalGeneric(126,_("%s terminated abnormally"),unzipper);
}
#else
close(fh[0]) ;
#endif
} else if( strcmp(filename,"-") == 0 ) {
xcfstream = fdopen(dup(0),"rb") ;
if( !xcfstream )
FatalUnexpected("!Cannot dup stdin for input") ;
} else {
xcfstream = fopen(filename,"rb") ;
if( !xcfstream )
FatalGeneric(21,_("!Cannot open %s"),filename);
}
/* OK, now we have an open stream ... */
if( fstat(fileno(xcfstream),&statbuf) == 0 &&
(statbuf.st_mode & S_IFMT) == S_IFREG ) {
xcf_length = statbuf.st_size ;
#if HAVE_MMAP
xcf_file = mmap(0,xcf_length,PROT_READ,MAP_SHARED,fileno(xcfstream),0);
if( xcf_file != (void*)-1 )
return ;
if( errno != ENODEV ) {
int saved = errno ;
fclose(xcfstream) ;
xcf_file = 0 ;
errno = saved ;
FatalUnexpected("!Could not mmap input");
}
#endif
xcf_file = malloc(xcf_length);
if( xcf_file == 0 )
FatalUnexpected(_("Out of memory for xcf data"));
if( fread(xcf_file,1,xcf_length,xcfstream) != xcf_length ) {
if( feof(xcfstream) )
FatalUnexpected(_("XCF file shrunk while reading it"));
else
FatalUnexpected(_("!Could not read xcf data"));
}
fclose(xcfstream) ;
xcfstream = 0 ;
} else {
size_t blocksize = 0x80000 ; /* 512 KB */
xcf_length = 0 ;
xcf_file = 0 ;
while(1) {
xcf_file = realloc(xcf_file,blocksize) ;
if( xcf_file == 0 )
FatalUnexpected(_("Out of memory for xcf data"));
size_t actual = fread(xcf_file+xcf_length,1,blocksize-xcf_length,
xcfstream) ;
xcf_length += actual ;
if( feof(xcfstream) )
break ;
if( xcf_length < blocksize ) {
FatalUnexpected(_("!Could not read xcf data")) ;
}
blocksize += (blocksize >> 1) & ~(size_t)0x3FFF ; /* 16 KB granularity */
}
fclose(xcfstream) ;
xcfstream = 0 ;
}
}
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