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ea0c7395de
.rtext files in the assembly object files. Now I can avoid doing this at runtime, which means that ZDoom is now UPX-compatible if anyone wants to pack it. You will need to do a rebuild or manually delete the old assembly .obj files for the first build from this revision to succeed, since there are no changes to the assembly files themselves, and the build process will not be able to automatically detect that they need to be rebuilt. SVN r473 (trunk)
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/* fixrtext.c
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**
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** Given a coff-win32 object file, search for an .rtext section header and
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** set its IMAGE_SCN_MEM_WRITE flag if it isn't already set. This gets
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** around an NASM deficiency that prevents creating such files with
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** "execute read write" sections.
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**
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** The author of this program disclaims copyright.
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*/
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <stdio.h>
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#ifndef _MSC_VER
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#include <errno.h>
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int fopen_s (FILE **pFile, const char *filename, const char *mode)
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{
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if ((*pFile = fopen (filename, mode)) == NULL)
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{
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return errno;
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}
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return 0;
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}
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#endif
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int main (int argc, char **argv)
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{
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FILE *f;
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IMAGE_FILE_HEADER filehead;
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IMAGE_SECTION_HEADER secthead;
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int i;
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if (argc != 2)
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return 1;
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if (fopen_s (&f, argv[1], "r+b"))
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{
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fprintf (stderr, "Could not open %s\n", argv[1]);
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return 1;
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}
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if (fread (&filehead, sizeof filehead, 1, f) != 1 ||
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filehead.Machine != IMAGE_FILE_MACHINE_I386)
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{
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fprintf (stderr, "%s is not an x86 object file\n", argv[1]);
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fclose (f);
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return 1;
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}
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for (i = 0; i < filehead.NumberOfSections; ++i)
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{
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if (fread (§head, sizeof secthead, 1, f) != 1)
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{
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fprintf (stderr, "Could not read section header %d\n", i + 1);
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fclose (f);
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return 1;
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}
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if (memcmp (secthead.Name, ".rtext\0", IMAGE_SIZEOF_SHORT_NAME) == 0)
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{
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if (secthead.Characteristics & IMAGE_SCN_MEM_WRITE)
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{
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fprintf (stderr, "The .rtext section in %s is already writeable\n", argv[1]);
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fclose (f);
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return 0;
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}
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secthead.Characteristics |= IMAGE_SCN_MEM_WRITE;
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if (fseek (f, -(long)sizeof secthead, SEEK_CUR))
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{
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fprintf (stderr, "Failed to seek back to start of .rtext section header\n");
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fclose (f);
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return 1;
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}
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if (fwrite (§head, sizeof secthead, 1, f) != 1)
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{
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fprintf (stderr, "Failed to rewrite .rtext section header\n");
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fclose (f);
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return 1;
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}
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/* fprintf (stderr, "The .rtext section in %s was successfully made writeable\n", argv[1]); */
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fclose (f);
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return 0;
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}
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}
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fclose (f);
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return 0;
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}
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