On Sun, Nov 09, 2008 at 04:04:11PM +0300, Alexey I. Froloff wrote:
> * Dmitry V. Levin <ldv@> [081109 15:10]:
> > Я пока не улавливаю суть происходящего с mutt_md5.
> Код (md5_process_bytes):
> 
>   /* Move remaining bytes in internal buffer.  */
>   if (len > 0)
>     {
>       size_t left_over = ctx->buflen;
> 
>       memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
>       left_over += len;
>       if (left_over >= 64)
> 	{
> 	  md5_process_block (ctx->buffer, 64, ctx);
> 	  left_over -= 64;
> 	  memcpy (ctx->buffer, &ctx->buffer[16], left_over);
> 	}
>       ctx->buflen = left_over;
>     }
> 
> Соответственно затык происходит на первом memcpy.
> 
> (gdb) run
> Starting program: /home/raorn/src/gitsnaps/packages/mutt1.5/work/mutt-1.5.18/mutt_md5 
> foobar
> 
> Breakpoint 1, md5_process_bytes (buffer=0xbfd62df4, len=7, ctx=0xbfd63e3c) at md5.c:223
> 223       if (ctx->buflen != 0)
> (gdb) nexti
> 220     {
> (gdb) 
> 0x080497ac      220     {
> (gdb) 
> 0x080497af      220     {
> (gdb) 
> 0x080497b2      220     {
> (gdb) 
> 223       if (ctx->buflen != 0)
> (gdb) 
> 0x080497b8      223       if (ctx->buflen != 0)
> (gdb) 
> 0x080497ba      223       if (ctx->buflen != 0)
> (gdb) 
> 247       if (len >= 64)
> (gdb) 
> 0x080497bf      247       if (len >= 64)
> (gdb) 
> 269       if (len > 0)
> (gdb) 
> 0x080497c3      269       if (len > 0)
> (gdb) 
> 271           size_t left_over = ctx->buflen;
> (gdb) 
> 52        return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
> (gdb) 
> 271           size_t left_over = ctx->buflen;
> (gdb) 
> 52        return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
> (gdb) 
> 0x080497e5      52        return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
> (gdb) 
> 0x080497e9      52        return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
> (gdb) 
> 274           left_over += len;
> (gdb) 
> 52        return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
> (gdb) 
> 0x080497f2      52        return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
> (gdb) 
> 
> ^C
> Program received signal SIGINT, Interrupt.
> memcpy (__dest=0xbfd62df4, __src=0x7, __len=3218488892) at /usr/include/bits/string3.h:52
> 52        return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));

__len=3218488892?  Не многовато ли?


-- 
ldv