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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/transport/chttp2/varint.h"
int grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value) {
if (tail_value < (1 << 7)) {
return 2;
} else if (tail_value < (1 << 14)) {
return 3;
} else if (tail_value < (1 << 21)) {
return 4;
} else if (tail_value < (1 << 28)) {
return 5;
} else {
return 6;
}
}
void grpc_chttp2_hpack_write_varint_tail(gpr_uint32 tail_value,
gpr_uint8* target, int tail_length) {
switch (tail_length) {
case 5:
target[4] = (gpr_uint8)((tail_value >> 28) | 0x80);
case 4:
target[3] = (gpr_uint8)((tail_value >> 21) | 0x80);
case 3:
target[2] = (gpr_uint8)((tail_value >> 14) | 0x80);
case 2:
target[1] = (gpr_uint8)((tail_value >> 7) | 0x80);
case 1:
target[0] = (gpr_uint8)((tail_value) | 0x80);
}
target[tail_length - 1] &= 0x7f;
}
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