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-rwxr-xr-xmkstatichdtbl.py90
1 files changed, 90 insertions, 0 deletions
diff --git a/mkstatichdtbl.py b/mkstatichdtbl.py
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+++ b/mkstatichdtbl.py
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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# This scripts reads static table entries [1] and generates
+# token_stable and stable. This table is used in lib/nghttp3_qpack.c.
+#
+# [1] https://quicwg.org/base-drafts/draft-ietf-quic-qpack.html#name-static-table-2
+
+import re, sys
+
+def hd_map_hash(name):
+ h = 2166136261
+
+ # FNV hash variant: http://isthe.com/chongo/tech/comp/fnv/
+ for c in name:
+ h ^= ord(c)
+ h *= 16777619
+ h &= 0xffffffff
+
+ return h
+
+class Header:
+ def __init__(self, idx, name, value):
+ self.idx = idx
+ self.name = name
+ self.value = value
+ self.token = -1
+
+entries = []
+for line in sys.stdin:
+ m = re.match(r'(\d+)\s+(\S+)\s+(\S.*)?', line)
+ val = m.group(3).strip() if m.group(3) else ''
+ entries.append(Header(int(m.group(1)), m.group(2), val))
+
+token_entries = sorted(entries, key=lambda ent: ent.name)
+
+token = 0
+seq = 0
+name = token_entries[0].name
+for i, ent in enumerate(token_entries):
+ if name != ent.name:
+ name = ent.name
+ token = seq
+ seq += 1
+ ent.token = token
+
+def to_enum_hd(k):
+ res = 'NGHTTP3_QPACK_TOKEN_'
+ for c in k.upper():
+ if c == ':' or c == '-':
+ res += '_'
+ continue
+ res += c
+ return res
+
+def gen_enum(entries):
+ used = {}
+ print('typedef enum nghttp3_qpack_token {')
+ for ent in entries:
+ if ent.name in used:
+ continue
+ used[ent.name] = True
+ enumname = to_enum_hd(ent.name)
+ print('''\
+ /**
+ * :enum:`{enumname}` is a token for ``{name}``.
+ */'''.format(enumname=enumname, name=ent.name))
+ if ent.token is None:
+ print(' {},'.format(enumname))
+ else:
+ print(' {} = {},'.format(enumname, ent.token))
+ print('} nghttp3_qpack_token;')
+
+gen_enum(entries)
+
+print()
+
+print('static nghttp3_qpack_static_entry token_stable[] = {')
+for i, ent in enumerate(token_entries):
+ print('MAKE_STATIC_ENT({}, {}, {}u),'\
+ .format(ent.idx, to_enum_hd(ent.name), hd_map_hash(ent.name)))
+print('};')
+
+print()
+
+print('static nghttp3_qpack_static_header stable[] = {')
+for ent in entries:
+ print('MAKE_STATIC_HD("{}", "{}", {}),'\
+ .format(ent.name, ent.value, to_enum_hd(ent.name)))
+print('};')