mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-14 19:50:12 +01:00
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Test program to mangle 1 bit in a binary
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*/
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#include "nspr.h"
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#include "plstr.h"
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#include "plgetopt.h"
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#include "prio.h"
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static PRFileDesc *pr_stderr;
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static void
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usage (char *program_name)
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{
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PR_fprintf (pr_stderr, "Usage:");
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PR_fprintf (pr_stderr, "%s -i shared_library_name -o byte_offset -b bit\n", program_name);
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}
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int
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main (int argc, char **argv)
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{
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/* buffers and locals */
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PLOptState *optstate;
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char *programName;
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char cbuf;
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/* parameter set variables */
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const char *libFile = NULL;
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int bitOffset = -1;
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/* return values */
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int retval = 2; /* 0 - test succeeded.
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* 1 - illegal args
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* 2 - function failed */
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PRFileDesc *fd = NULL;
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int bytesRead;
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int bytesWritten;
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PROffset32 offset = -1;
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PROffset32 pos;
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programName = PL_strrchr(argv[0], '/');
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programName = programName ? (programName + 1) : argv[0];
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pr_stderr = PR_STDERR;
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optstate = PL_CreateOptState (argc, argv, "i:o:b:");
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if (optstate == NULL) {
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return 1;
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}
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while (PL_GetNextOpt (optstate) == PL_OPT_OK) {
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switch (optstate->option) {
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case 'i':
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libFile = optstate->value;
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break;
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case 'o':
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offset = atoi(optstate->value);
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break;
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case 'b':
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bitOffset = atoi(optstate->value);
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break;
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}
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}
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if (libFile == NULL) {
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usage(programName);
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return 1;
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}
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if ((bitOffset >= 8) || (bitOffset < 0)) {
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usage(programName);
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return 1;
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}
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/* open the target signature file */
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fd = PR_OpenFile(libFile,PR_RDWR,0666);
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if (fd == NULL ) {
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/* lperror(libFile); */
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PR_fprintf(pr_stderr,"Couldn't Open %s\n",libFile);
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goto loser;
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}
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if (offset < 0) { /* convert to positive offset */
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pos = PR_Seek(fd, offset, PR_SEEK_END);
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if (pos == -1) {
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PR_fprintf(pr_stderr,"Seek for read on %s (to %d) failed\n",
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libFile, offset);
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goto loser;
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}
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offset = pos;
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}
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/* read the byte */
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pos = PR_Seek(fd, offset, PR_SEEK_SET);
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if (pos != offset) {
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PR_fprintf(pr_stderr,"Seek for read on %s (to %d) failed\n",
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libFile, offset);
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goto loser;
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}
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bytesRead = PR_Read(fd, &cbuf, 1);
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if (bytesRead != 1) {
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PR_fprintf(pr_stderr,"Read on %s (to %d) failed\n", libFile, offset);
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goto loser;
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}
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PR_fprintf(pr_stderr,"Changing byte 0x%08x (%d): from %02x (%d) to ",
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offset, offset, (unsigned char)cbuf, (unsigned char)cbuf);
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/* change it */
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cbuf ^= 1 << bitOffset;
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PR_fprintf(pr_stderr,"%02x (%d)\n",
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(unsigned char)cbuf, (unsigned char)cbuf);
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/* write it back out */
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pos = PR_Seek(fd, offset, PR_SEEK_SET);
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if (pos != offset) {
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PR_fprintf(pr_stderr,"Seek for write on %s (to %d) failed\n",
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libFile, offset);
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goto loser;
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}
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bytesWritten = PR_Write(fd, &cbuf, 1);
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if (bytesWritten != 1) {
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PR_fprintf(pr_stderr,"Write on %s (to %d) failed\n", libFile, offset);
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goto loser;
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}
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retval = 0;
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loser:
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if (fd)
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PR_Close(fd);
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PR_Cleanup ();
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return retval;
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}
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/*#DEFINES += -DSHLIB_SUFFIX=\"$(DLL_SUFFIX)\" -DSHLIB_PREFIX=\"$(DLL_PREFIX)\" */
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