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* remote-utils.c (try_rle): New function.

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(putpkt_binary): Use it.
This commit is contained in:
Daniel Jacobowitz 2006-09-21 16:09:54 +00:00
parent 68437a39ee
commit 5ffff7c1d1
2 changed files with 52 additions and 5 deletions
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5
gdb/gdbserver/ChangeLog
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@ -1,3 +1,8 @@
2006-09-21 Daniel Jacobowitz <dan@codesourcery.com>
* remote-utils.c (try_rle): New function.
(putpkt_binary): Use it.
2006-08-19 Daniel Jacobowitz <dan@codesourcery.com>
* Makefile.in (clean): Clean reg-x86-64-linux.c.

52
gdb/gdbserver/remote-utils.c
View File

@ -406,6 +406,50 @@ remote_unescape_input (const gdb_byte *buffer, int len,
return output_index;
}
/* Look for a sequence of characters which can be run-length encoded.
If there are any, update *CSUM and *P. Otherwise, output the
single character. Return the number of characters consumed. */
static int
try_rle (char *buf, int remaining, unsigned char *csum, char **p)
{
int n;
/* Always output the character. */
*csum += buf[0];
*(*p)++ = buf[0];
/* Don't go past '~'. */
if (remaining > 97)
remaining = 97;
for (n = 1; n < remaining; n++)
if (buf[n] != buf[0])
break;
/* N is the index of the first character not the same as buf[0].
buf[0] is counted twice, so by decrementing N, we get the number
of characters the RLE sequence will replace. */
n--;
if (n < 3)
return 1;
/* Skip the frame characters. The manual says to skip '+' and '-'
also, but there's no reason to. Unfortunately these two unusable
characters double the encoded length of a four byte zero
value. */
while (n + 29 == '$' || n + 29 == '#')
n--;
*csum += '*';
*(*p)++ = '*';
*csum += n + 29;
*(*p)++ = n + 29;
return n + 1;
}
/* Send a packet to the remote machine, with error checking.
The data of the packet is in BUF, and the length of the
packet is in CNT. Returns >= 0 on success, -1 otherwise. */
@ -427,11 +471,9 @@ putpkt_binary (char *buf, int cnt)
p = buf2;
*p++ = '$';
for (i = 0; i < cnt; i++)
{
csum += buf[i];
*p++ = buf[i];
}
for (i = 0; i < cnt;)
i += try_rle (buf + i, cnt - i, &csum, &p);
*p++ = '#';
*p++ = tohex ((csum >> 4) & 0xf);
*p++ = tohex (csum & 0xf);