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Compute checksum for PE images.

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This commit is contained in:
Nick Clifton 2002-04-09 16:43:26 +00:00
parent 7e8d45b779
commit 05793179d7
2 changed files with 112 additions and 0 deletions
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8
bfd/ChangeLog
View File

@ -1,3 +1,11 @@
2002-04-09 Casper S. Hornstrup <chorns@users.sourceforge.net>
* coffcode.h (coff_read_word): New.
(coff_compute_checksum): New.
(coff_apply_checksum): New.
(coff_write_object_contents): Call coff_apply_checksum () to
apply checksum to PE image.
2002-04-08 Randolph Chung <tausq@debian.org>
* elf32-hppa.c (hppa_unwind_entry_compare): Move to elf-hppa.h.

104
bfd/coffcode.h
View File

@ -341,6 +341,11 @@ static PTR coff_mkobject_hook PARAMS ((bfd *, PTR, PTR));
#ifdef COFF_WITH_PE
static flagword handle_COMDAT PARAMS ((bfd *, flagword, PTR, const char *, asection *));
#endif
#ifdef COFF_IMAGE_WITH_PE
static boolean coff_read_word PARAMS ((bfd *, unsigned int *));
static unsigned int coff_compute_checksum PARAMS ((bfd *));
static boolean coff_apply_checksum PARAMS ((bfd *));
#endif
/* void warning(); */
@ -3270,6 +3275,100 @@ coff_add_missing_symbols (abfd)
#endif /* 0 */
#ifdef COFF_IMAGE_WITH_PE
static unsigned int pelength;
static unsigned int peheader;
static boolean
coff_read_word (abfd, value)
bfd *abfd;
unsigned int *value;
{
unsigned char b[2];
int status;
status = bfd_bread (b, (bfd_size_type) 2, abfd);
if (status < 1)
{
*value = 0;
return false;
}
if (status == 1)
*value = (unsigned int) b[0];
else
*value = (unsigned int) (b[0] + (b[1] << 8));
pelength += (unsigned int) status;
return true;
}
static unsigned int
coff_compute_checksum (abfd)
bfd *abfd;
{
boolean more_data;
file_ptr filepos;
unsigned int value;
unsigned int total;
total = 0;
pelength = 0;
filepos = (file_ptr) 0;
do
{
if (bfd_seek (abfd, filepos, SEEK_SET) != 0)
return 0;
more_data = coff_read_word (abfd, &value);
total += value;
total = 0xffff & (total + (total >> 0x10));
filepos += 2;
}
while (more_data);
return (0xffff & (total + (total >> 0x10)));
}
static boolean
coff_apply_checksum (abfd)
bfd *abfd;
{
unsigned int computed;
unsigned int checksum = 0;
if (bfd_seek (abfd, 0x3c, SEEK_SET) != 0)
return false;
if (!coff_read_word (abfd, &peheader))
return false;
if (bfd_seek (abfd, peheader + 0x58, SEEK_SET) != 0)
return false;
checksum = 0;
bfd_bwrite (&checksum, (bfd_size_type) 4, abfd);
if (bfd_seek (abfd, peheader, SEEK_SET) != 0)
return false;
computed = coff_compute_checksum (abfd);
checksum = computed + pelength;
if (bfd_seek (abfd, peheader + 0x58, SEEK_SET) != 0)
return false;
bfd_bwrite (&checksum, (bfd_size_type) 4, abfd);
return true;
}
#endif /* COFF_IMAGE_WITH_PE */
/* SUPPRESS 558 */
/* SUPPRESS 529 */
static boolean
@ -4060,6 +4159,11 @@ coff_write_object_contents (abfd)
if (amount != bfd_coff_aoutsz (abfd))
return false;
#ifdef COFF_IMAGE_WITH_PE
if (! coff_apply_checksum (abfd))
return false;
#endif
}
#ifdef RS6000COFF_C
else