palemoon-dev/platform/netwerk/protocol/http/make_outgoing_tables.py

# This script exists to auto-generate Http2HuffmanOutgoing.h from the table
# contained in the HPACK spec. It's pretty simple to run:
#   python make_outgoing_tables.py < http2_huffman_table.txt > Http2HuffmanOutgoing.h
# where huff_outgoing.txt is copy/pasted text from the latest version of the
# HPACK spec, with all non-relevant lines removed (the most recent version
# of huff_outgoing.txt also lives in this directory as an example).
import sys

sys.stdout.write('''/*
 * THIS FILE IS AUTO-GENERATED. DO NOT EDIT!
 */
#ifndef mozilla__net__Http2HuffmanOutgoing_h
#define mozilla__net__Http2HuffmanOutgoing_h

namespace mozilla {
namespace net {

struct HuffmanOutgoingEntry {
  uint32_t mValue;
  uint8_t mLength;
};

static HuffmanOutgoingEntry HuffmanOutgoing[] = {
''')

entries = []
for line in sys.stdin:
    line = line.strip()
    obracket = line.rfind('[')
    nbits = int(line[obracket + 1:-1])

    lastbar = line.rfind('|')
    space = line.find(' ', lastbar)
    encend = line.rfind(' ', 0, obracket)

    enc = line[space:encend].strip()
    val = int(enc, 16)

    entries.append({'length': nbits, 'value': val})

line = []
for i, e in enumerate(entries):
    sys.stdout.write('  { 0x%08x, %s }' %
                     (e['value'], e['length']))
    if i < (len(entries) - 1):
        sys.stdout.write(',')
    sys.stdout.write('\n')

sys.stdout.write('''};

} // namespace net
} // namespace mozilla

#endif // mozilla__net__Http2HuffmanOutgoing_h
''')