/* Low-level I/O routines for BFDs.
- Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+
+ Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+
Written by Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
#define S_IXOTH 0001 /* Execute by others. */
#endif
-/* Note that archive entries don't have streams; they share their parent's.
- This allows someone to play with the iostream behind BFD's back.
-
- Also, note that the origin pointer points to the beginning of a file's
- contents (0 for non-archive elements). For archive entries this is the
- first octet in the file, NOT the beginning of the archive header. */
-
-static size_t
-real_read (void *where, size_t a, size_t b, FILE *file)
+file_ptr
+real_ftell (FILE *file)
{
- /* FIXME - this looks like an optimization, but it's really to cover
- up for a feature of some OSs (not solaris - sigh) that
- ld/pe-dll.c takes advantage of (apparently) when it creates BFDs
- internally and tries to link against them. BFD seems to be smart
- enough to realize there are no symbol records in the "file" that
- doesn't exist but attempts to read them anyway. On Solaris,
- attempting to read zero bytes from a NULL file results in a core
- dump, but on other platforms it just returns zero bytes read.
- This makes it to something reasonable. - DJ */
- if (a == 0 || b == 0)
- return 0;
-
+#if defined (HAVE_FTELLO64)
+ return ftello64 (file);
+#elif defined (HAVE_FTELLO)
+ return ftello (file);
+#else
+ return ftell (file);
+#endif
+}
-#if defined (__VAX) && defined (VMS)
- /* Apparently fread on Vax VMS does not keep the record length
- information. */
- return read (fileno (file), where, a * b);
+int
+real_fseek (FILE *file, file_ptr offset, int whence)
+{
+#if defined (HAVE_FSEEKO64)
+ return fseeko64 (file, offset, whence);
+#elif defined (HAVE_FSEEKO)
+ return fseeko (file, offset, whence);
#else
- return fread (where, a, b, file);
+ return fseek (file, offset, whence);
#endif
}
+/*
+INTERNAL_DEFINITION
+ struct bfd_iovec
+
+DESCRIPTION
+
+ The <<struct bfd_iovec>> contains the internal file I/O class.
+ Each <<BFD>> has an instance of this class and all file I/O is
+ routed through it (it is assumed that the instance implements
+ all methods listed below).
+
+.struct bfd_iovec
+.{
+. {* To avoid problems with macros, a "b" rather than "f"
+. prefix is prepended to each method name. *}
+. {* Attempt to read/write NBYTES on ABFD's IOSTREAM storing/fetching
+. bytes starting at PTR. Return the number of bytes actually
+. transfered (a read past end-of-file returns less than NBYTES),
+. or -1 (setting <<bfd_error>>) if an error occurs. *}
+. file_ptr (*bread) (struct bfd *abfd, void *ptr, file_ptr nbytes);
+. file_ptr (*bwrite) (struct bfd *abfd, const void *ptr,
+. file_ptr nbytes);
+. {* Return the current IOSTREAM file offset, or -1 (setting <<bfd_error>>
+. if an error occurs. *}
+. file_ptr (*btell) (struct bfd *abfd);
+. {* For the following, on successful completion a value of 0 is returned.
+. Otherwise, a value of -1 is returned (and <<bfd_error>> is set). *}
+. int (*bseek) (struct bfd *abfd, file_ptr offset, int whence);
+. int (*bclose) (struct bfd *abfd);
+. int (*bflush) (struct bfd *abfd);
+. int (*bstat) (struct bfd *abfd, struct stat *sb);
+.};
+
+*/
+
+
/* Return value is amount read. */
bfd_size_type
return get;
}
- nread = real_read (ptr, 1, (size_t) size, bfd_cache_lookup (abfd));
+ if (abfd->iovec)
+ nread = abfd->iovec->bread (abfd, ptr, size);
+ else
+ nread = 0;
if (nread != (size_t) -1)
abfd->where += nread;
- /* Set bfd_error if we did not read as much data as we expected.
-
- If the read failed due to an error set the bfd_error_system_call,
- else set bfd_error_file_truncated.
-
- A BFD backend may wish to override bfd_error_file_truncated to
- provide something more useful (eg. no_symbols or wrong_format). */
- if (nread != size)
- {
- if (ferror (bfd_cache_lookup (abfd)))
- bfd_set_error (bfd_error_system_call);
- else
- bfd_set_error (bfd_error_file_truncated);
- }
-
return nread;
}
if ((abfd->flags & BFD_IN_MEMORY) != 0)
{
struct bfd_in_memory *bim = abfd->iostream;
+
size = (size_t) size;
if (abfd->where + size > bim->size)
{
return size;
}
- nwrote = fwrite (ptr, 1, (size_t) size, bfd_cache_lookup (abfd));
+ if (abfd->iovec)
+ nwrote = abfd->iovec->bwrite (abfd, ptr, size);
+ else
+ nwrote = 0;
+
if (nwrote != (size_t) -1)
abfd->where += nwrote;
if (nwrote != size)
return nwrote;
}
-bfd_vma
+file_ptr
bfd_tell (bfd *abfd)
{
file_ptr ptr;
if ((abfd->flags & BFD_IN_MEMORY) != 0)
return abfd->where;
- ptr = ftell (bfd_cache_lookup (abfd));
+ if (abfd->iovec)
+ {
+ ptr = abfd->iovec->btell (abfd);
+
+ if (abfd->my_archive)
+ ptr -= abfd->origin;
+ }
+ else
+ ptr = 0;
- if (abfd->my_archive)
- ptr -= abfd->origin;
abfd->where = ptr;
return ptr;
}
{
if ((abfd->flags & BFD_IN_MEMORY) != 0)
return 0;
- return fflush (bfd_cache_lookup(abfd));
+
+ if (abfd->iovec)
+ return abfd->iovec->bflush (abfd);
+ return 0;
}
/* Returns 0 for success, negative value for failure (in which case
int
bfd_stat (bfd *abfd, struct stat *statbuf)
{
- FILE *f;
int result;
if ((abfd->flags & BFD_IN_MEMORY) != 0)
abort ();
- f = bfd_cache_lookup (abfd);
- if (f == NULL)
- {
- bfd_set_error (bfd_error_system_call);
- return -1;
- }
- result = fstat (fileno (f), statbuf);
+ if (abfd->iovec)
+ result = abfd->iovec->bstat (abfd, statbuf);
+ else
+ result = -1;
+
if (result < 0)
bfd_set_error (bfd_error_system_call);
return result;
bfd_seek (bfd *abfd, file_ptr position, int direction)
{
int result;
- FILE *f;
- long file_position;
+ file_ptr file_position;
/* For the time being, a BFD may not seek to it's end. The problem
is that we don't easily have a way to recognize the end of an
element in an archive. */
(abfd->direction == both_direction))
{
bfd_size_type newsize, oldsize;
+
oldsize = (bim->size + 127) & ~(bfd_size_type) 127;
bim->size = abfd->where;
/* Round up to cut down on memory fragmentation */
if (abfd->format != bfd_archive && abfd->my_archive == 0)
{
-#if 0
- /* Explanation for this code: I'm only about 95+% sure that the above
- conditions are sufficient and that all i/o calls are properly
- adjusting the `where' field. So this is sort of an `assert'
- that the `where' field is correct. If we can go a while without
- tripping the abort, we can probably safely disable this code,
- so that the real optimizations happen. */
- file_ptr where_am_i_now;
- where_am_i_now = ftell (bfd_cache_lookup (abfd));
- if (abfd->my_archive)
- where_am_i_now -= abfd->origin;
- if (where_am_i_now != abfd->where)
- abort ();
-#endif
if (direction == SEEK_SET && (bfd_vma) position == abfd->where)
return 0;
}
In the meantime, no optimization for archives. */
}
- f = bfd_cache_lookup (abfd);
file_position = position;
if (direction == SEEK_SET && abfd->my_archive != NULL)
file_position += abfd->origin;
- result = fseek (f, file_position, direction);
+ if (abfd->iovec)
+ result = abfd->iovec->bseek (abfd, file_position, direction);
+ else
+ result = -1;
+
if (result != 0)
{
int hold_errno = errno;
long
bfd_get_mtime (bfd *abfd)
{
- FILE *fp;
struct stat buf;
if (abfd->mtime_set)
return abfd->mtime;
- fp = bfd_cache_lookup (abfd);
- if (0 != fstat (fileno (fp), &buf))
+ if (abfd->iovec == NULL)
+ return 0;
+
+ if (abfd->iovec->bstat (abfd, &buf) != 0)
return 0;
abfd->mtime = buf.st_mtime; /* Save value in case anyone wants it */
error when it tries to read the table, or a "virtual memory
exhausted" error when it tries to allocate 15 bazillon bytes
of space for the 15 bazillon byte table it is about to read.
- This function at least allows us to answer the quesion, "is the
+ This function at least allows us to answer the question, "is the
size reasonable?".
*/
long
bfd_get_size (bfd *abfd)
{
- FILE *fp;
struct stat buf;
if ((abfd->flags & BFD_IN_MEMORY) != 0)
return ((struct bfd_in_memory *) abfd->iostream)->size;
- fp = bfd_cache_lookup (abfd);
- if (0 != fstat (fileno (fp), & buf))
+ if (abfd->iovec == NULL)
+ return 0;
+
+ if (abfd->iovec->bstat (abfd, &buf) != 0)
return 0;
return buf.st_size;
projects / binutils.git / blobdiff