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BUG/MINOR: qpack: support bigger prefix-integer encoding

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Prefix-integer encoding function was incomplete. It was not able to deal
correctly with value encoded on more than 2 bytes. This maximum value depends
on the size of the prefix, but value greater than 254 were all impacted.

Most notably, this change is required to support header name/value with
sizeable length. Previously, length was incorrectly encoded. The client thus
closed the connection with QPACK_DECOMPRESSION_ERROR.
This commit is contained in:
Amaury Denoyelle 2022-05-30 14:24:40 +02:00
parent 5f6de8d77a
commit 11f5a796c1
1 changed files with 21 additions and 6 deletions
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27
src/qpack-enc.c
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@ -28,22 +28,37 @@ static size_t qpack_get_prefix_int_size(int i, int prefix_size)
*
* Returns 0 if success else non-zero.
*/
static int qpack_encode_prefix_integer(struct buffer *out, int i, int prefix_size, unsigned char before_prefix)
static int qpack_encode_prefix_integer(struct buffer *out, int i,
int prefix_size,
unsigned char before_prefix)
{
BUG_ON(!prefix_size);
const int mod = (1 << prefix_size) - 1;
BUG_ON_HOT(!prefix_size);
if (i < (1 << prefix_size) - 1) {
if (i < mod) {
if (b_room(out) < 1)
return 1;
b_putchr(out, before_prefix | i);
}
else {
if (b_room(out) < 2)
int to_encode = i - mod;
const size_t sz = to_encode / mod;
if (b_room(out) < sz)
return 1;
b_putchr(out, before_prefix | ((1 << prefix_size) - 1));
b_putchr(out, i - ((1 << prefix_size) - 1));
b_putchr(out, before_prefix | mod);
while (1) {
if (to_encode > 0x7f) {
b_putchr(out, 0x80 | (to_encode & 0x7f));
to_encode >>= 7;
}
else {
b_putchr(out, to_encode & 0x7f);
break;
}
}
}
return 0;