diff options
Diffstat (limited to 'bfd/bfd.c')
| -rw-r--r-- | bfd/bfd.c | 48 |
1 files changed, 48 insertions, 0 deletions
@@ -146,6 +146,7 @@ CODE_FRAGMENT . struct _oasys_data *oasys_obj_data; . struct _oasys_ar_data *oasys_ar_data; . struct coff_tdata *coff_obj_data; +. struct ecoff_tdata *ecoff_obj_data; . struct ieee_data_struct *ieee_data; . struct ieee_ar_data_struct *ieee_ar_data; . struct srec_data_struct *srec_data; @@ -519,6 +520,53 @@ bfd_get_mtime (abfd) /* FUNCTION + The bfd_get_size function + +SYNOPSIS + long bfd_get_size(bfd *); + +DESCRIPTION + Return file size (as read from file system) for the file + associated with a bfd. + + Note that the initial motivation for, and use of, this routine is not + so we can get the exact size of the object the bfd applies to, since + that might not be generally possible (archive members for example?). + Although it would be ideal if someone could eventually modify + it so that such results were guaranteed. + + Instead, we want to ask questions like "is this NNN byte sized + object I'm about to try read from file offset YYY reasonable?" + As as example of where we might want to do this, some object formats + use string tables for which the first sizeof(long) bytes of the table + contain the size of the table itself, including the size bytes. + If an application tries to read what it thinks is one of these + string tables, without some way to validate the size, and for + some reason the size is wrong (byte swapping error, wrong location + for the string table, etc), the only clue is likely to be a read + error when it tries to read the table, or a "virtual memory + exhausted" error when it tries to allocated 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 + size reasonable?". +*/ + +long +bfd_get_size (abfd) + bfd *abfd; +{ + FILE *fp; + struct stat buf; + + fp = bfd_cache_lookup (abfd); + if (0 != fstat (fileno (fp), &buf)) + return 0; + + return buf.st_size; +} + +/* +FUNCTION stuff DESCRIPTION |