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#!/usr/bin/env python2.7 |
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# Copyright 2015, Google Inc. |
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# All rights reserved. |
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# |
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# Redistribution and use in source and binary forms, with or without |
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# modification, are permitted provided that the following conditions are |
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# met: |
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# |
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# * Redistributions of source code must retain the above copyright |
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# notice, this list of conditions and the following disclaimer. |
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# * Redistributions in binary form must reproduce the above |
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# copyright notice, this list of conditions and the following disclaimer |
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# in the documentation and/or other materials provided with the |
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# distribution. |
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# * Neither the name of Google Inc. nor the names of its |
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# contributors may be used to endorse or promote products derived from |
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# this software without specific prior written permission. |
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# |
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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import perfection |
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_SETTINGS = { |
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'HEADER_TABLE_SIZE': 1, |
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'ENABLE_PUSH': 2, |
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'MAX_CONCURRENT_STREAMS': 3, |
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'INITIAL_WINDOW_SIZE': 4, |
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'MAX_FRAME_SIZE': 5, |
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'MAX_HEADER_LIST_SIZE': 6, |
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'GRPC_ALLOW_TRUE_BINARY_METADATA': 0xfe03, |
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} |
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p = perfection.hash_parameters(sorted(_SETTINGS.values())) |
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print p |
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def hash(i): |
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i += p.offset |
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x = i % p.t |
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y = i / p.t |
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return x + p.r[y] |
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print 'typedef enum {' |
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for name in sorted(_SETTINGS.keys()): |
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index = _SETTINGS[name] |
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print ' GRPC_CHTTP2_SETTING_%s = %d, /* wire id %d */' % ( |
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name, hash(index), index) |
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print '} grpc_chttp2_setting_id;' |
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print 'const uint16_t grpc_setting_id_to_wire_id[] = {%s};' % ','.join( |
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'%d' % s for s in p.slots) |
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print """ |
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bool grpc_wire_id_to_setting_id(uint32_t wire_id, grpc_chttp2_setting_id *out) { |
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static const uint32_t r[] = {%(r)s}; |
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uint32_t i = wire_id %(offset_sign)s %(offset)d; |
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uint32_t x = i %% %(t)d; |
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uint32_t y = i / %(t)d; |
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uint32_t h = x; |
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if (y < GPR_ARRAY_SIZE(r)) { |
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uint32_t delta = (uint32_t)r[y]; |
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h += delta; |
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} |
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*out = (grpc_chttp2_setting_id)i; |
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return i < GPR_ARRAY_SIZE(grpc_setting_id_to_wire_id) && grpc_setting_id_to_wire_id[i] == wire_id; |
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}""" % { |
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'r': ','.join('%d' % (r if r is not None else 0) for r in p.r), |
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't': p.t, |
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'offset': abs(p.offset), |
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'offset_sign': '+' if p.offset > 0 else '-' |
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} |
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