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Bug 193386. Add ability to seek to negative offset from EOF.

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r=slavo.katuscak,glen.beasley
This commit is contained in:
nelson%bolyard.com 2007-01-26 19:38:05 +00:00
parent 23ba5ce55d
commit b8daf2030f
1 changed files with 22 additions and 16 deletions
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38
security/nss/cmd/shlibsign/mangle/mangle.c
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@ -37,7 +37,7 @@
/*
* Test program to mangle 1 bit in a binary
*
* $Id: mangle.c,v 1.6 2004/04/25 15:02:54 gerv%gerv.net Exp $
* $Id: mangle.c,v 1.7 2007/01/26 19:38:05 nelson%bolyard.com Exp $
*/
#include "nspr.h"
@ -65,17 +65,17 @@ main (int argc, char **argv)
/* parameter set variables */
const char *libFile = NULL;
int offset = -1;
int bitOffset = -1;
/* return values */
int retval = 2; /* 0 - test succeeded.
* 1 - illegal args
* 2 - function failed */
PRFileDesc *fd;
PRFileDesc *fd = NULL;
int bytesRead;
int bytesWritten;
int pos;
PROffset32 offset = -1;
PROffset32 pos;
programName = PL_strrchr(argv[0], '/');
programName = programName ? (programName + 1) : argv[0];
@ -112,11 +112,6 @@ main (int argc, char **argv)
return 1;
}
if (offset < 0) {
usage(programName);
return 1;
}
/* open the target signature file */
fd = PR_OpenFile(libFile,PR_RDWR,0666);
if (fd == NULL ) {
@ -125,10 +120,21 @@ main (int argc, char **argv)
goto loser;
}
if (offset < 0) { /* convert to positive offset */
pos = PR_Seek(fd, offset, PR_SEEK_END);
if (pos == -1) {
PR_fprintf(pr_stderr,"Seek for read on %s (to %d) failed\n",
libFile, offset);
goto loser;
}
offset = pos;
}
/* read the byte */
pos = PR_Seek(fd, offset, PR_SEEK_SET);
if (pos != offset) {
PR_fprintf(pr_stderr,"Seek for read on %s (to %d) failed\n", libFile, offset);
PR_fprintf(pr_stderr,"Seek for read on %s (to %d) failed\n",
libFile, offset);
goto loser;
}
bytesRead = PR_Read(fd, &cbuf, 1);
@ -141,13 +147,14 @@ main (int argc, char **argv)
offset, offset, (unsigned char)cbuf, (unsigned char)cbuf);
/* change it */
cbuf ^= 1 << bitOffset;
PR_fprintf(pr_stderr,"%02x (%d)\n", (
unsigned char)cbuf, (unsigned char)cbuf);
PR_fprintf(pr_stderr,"%02x (%d)\n",
(unsigned char)cbuf, (unsigned char)cbuf);
/* write it back out */
pos = PR_Seek(fd, offset, PR_SEEK_SET);
if (pos != offset) {
PR_fprintf(pr_stderr,"Seek for write on %s (to %d) failed\n", libFile, offset);
PR_fprintf(pr_stderr,"Seek for write on %s (to %d) failed\n",
libFile, offset);
goto loser;
}
bytesWritten = PR_Write(fd, &cbuf, 1);
@ -156,12 +163,11 @@ main (int argc, char **argv)
goto loser;
}
PR_Close(fd);
retval = 0;
loser:
if (fd)
PR_Close(fd);
PR_Cleanup ();
return retval;
}