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Use whole chunk when performing huffman encoding

This commit is contained in:
Tatsuhiro Tsujikawa 2016-08-16 09:59:09 +09:00
parent afdd51ff15
commit 0e1d0400d8
1 changed files with 33 additions and 4 deletions
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37
lib/nghttp2_hd_huffman.c
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@ -64,15 +64,44 @@ static ssize_t huff_encode_sym(nghttp2_bufs *bufs, size_t *avail_ptr,
code <<= 8 - (nbits & 0x7); code <<= 8 - (nbits & 0x7);
} }
/* we lose at most 3 bytes, but it is not critical in practice */
if (*avail_ptr < (nbits + 7) / 8) { if (*avail_ptr < (nbits + 7) / 8) {
rv = nghttp2_bufs_advance(bufs); /* slow path */
if (nbits > 24) {
rv = nghttp2_bufs_addb(bufs, (uint8_t)(code >> 24));
if (rv != 0) {
return rv;
}
nbits -= 8;
}
if (nbits > 16) {
rv = nghttp2_bufs_addb(bufs, (uint8_t)(code >> 16));
if (rv != 0) {
return rv;
}
nbits -= 8;
}
if (nbits > 8) {
rv = nghttp2_bufs_addb(bufs, (uint8_t)(code >> 8));
if (rv != 0) {
return rv;
}
nbits -= 8;
}
if (nbits == 8) {
rv = nghttp2_bufs_addb(bufs, (uint8_t)code);
if (rv != 0) {
return rv;
}
*avail_ptr = nghttp2_bufs_cur_avail(bufs);
return 8;
}
rv = nghttp2_bufs_addb_hold(bufs, (uint8_t)code);
if (rv != 0) { if (rv != 0) {
return rv; return rv;
} }
*avail_ptr = nghttp2_bufs_cur_avail(bufs); *avail_ptr = nghttp2_bufs_cur_avail(bufs);
/* we assume that we at least 3 buffer space available */ return (ssize_t)(8 - nbits);
assert(*avail_ptr >= 3);
} }
/* fast path, since most code is less than 8 */ /* fast path, since most code is less than 8 */