161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/*
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* Author: Christian Huitema
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* Copyright (c) 2017, Private Octopus, Inc.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Private Octopus, Inc. BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY 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 OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#ifndef WIN32
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#include <sys/types.h>
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#endif
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void picoformat_16(uint8_t* bytes, uint16_t n16)
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{
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bytes[0] = (uint8_t)(n16 >> 8);
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bytes[1] = (uint8_t)(n16);
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}
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void picoformat_24(uint8_t* bytes, uint32_t n24)
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{
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bytes[0] = (uint8_t)(n24 >> 16);
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bytes[1] = (uint8_t)(n24 >> 8);
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bytes[2] = (uint8_t)(n24);
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}
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void picoformat_32(uint8_t* bytes, uint32_t n32)
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{
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bytes[0] = (uint8_t)(n32 >> 24);
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bytes[1] = (uint8_t)(n32 >> 16);
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bytes[2] = (uint8_t)(n32 >> 8);
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bytes[3] = (uint8_t)(n32);
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}
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void picoformat_64(uint8_t* bytes, uint64_t n64)
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{
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bytes[0] = (uint8_t)(n64 >> 56);
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bytes[1] = (uint8_t)(n64 >> 48);
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bytes[2] = (uint8_t)(n64 >> 40);
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bytes[3] = (uint8_t)(n64 >> 32);
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bytes[4] = (uint8_t)(n64 >> 24);
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bytes[5] = (uint8_t)(n64 >> 16);
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bytes[6] = (uint8_t)(n64 >> 8);
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bytes[7] = (uint8_t)(n64);
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}
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/*
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* Summary of Integer Encodings
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* 2Bit Length Usable Bits Range
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* 00 1 6 0-63
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* 01 2 14 0-16383
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* 10 4 30 0-1073741823
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* 11 8 62 0-4611686018427387903
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*/
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size_t picoquic_encode_varint_length(uint64_t n64)
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{
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if (n64 < 16384) {
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if (n64 < 64) {
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return 1u;
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} else {
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return 2u;
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}
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} else {
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if (n64 < 1073741824) {
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return 4u;
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} else {
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return 8u;
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}
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}
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}
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size_t picoquic_decode_varint_length(uint8_t byte)
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{
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return ((size_t)1u) << ((byte & 0xC0) >> 6);
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}
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size_t picoquic_varint_encode(uint8_t* bytes, size_t max_bytes, uint64_t n64)
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{
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uint8_t* x = bytes;
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if (n64 < 16384) {
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if (n64 < 64) {
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if (max_bytes > 0) {
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*x++ = (uint8_t)(n64);
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}
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} else {
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if (max_bytes >= 2) {
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*x++ = (uint8_t)((n64 >> 8) | 0x40);
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*x++ = (uint8_t)(n64);
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}
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}
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} else if (n64 < 1073741824) {
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if (max_bytes >= 4) {
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*x++ = (uint8_t)((n64 >> 24) | 0x80);
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*x++ = (uint8_t)(n64 >> 16);
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*x++ = (uint8_t)(n64 >> 8);
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*x++ = (uint8_t)(n64);
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}
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} else {
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if (max_bytes >= 8) {
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*x++ = (uint8_t)((n64 >> 56) | 0xC0);
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*x++ = (uint8_t)(n64 >> 48);
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*x++ = (uint8_t)(n64 >> 40);
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*x++ = (uint8_t)(n64 >> 32);
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*x++ = (uint8_t)(n64 >> 24);
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*x++ = (uint8_t)(n64 >> 16);
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*x++ = (uint8_t)(n64 >> 8);
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*x++ = (uint8_t)(n64);
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}
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}
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return (x - bytes);
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}
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void picoquic_varint_encode_16(uint8_t* bytes, uint16_t n16)
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{
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uint8_t* x = bytes;
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*x++ = (uint8_t)(((n16 >> 8) | 0x40)&0x7F);
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*x++ = (uint8_t)(n16);
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}
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size_t picoquic_varint_decode(const uint8_t* bytes, size_t max_bytes, uint64_t* n64)
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{
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size_t length = ((size_t)1) << ((bytes[0] & 0xC0) >> 6);
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if (length > max_bytes) {
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length = 0;
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*n64 = 0;
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} else {
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uint64_t v = *bytes++ & 0x3F;
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for (size_t i = 1; i < length; i++) {
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v <<= 8;
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v += *bytes++;
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}
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*n64 = v;
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}
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return length;
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}
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size_t picoquic_varint_skip(const uint8_t* bytes)
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{
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return picoquic_decode_varint_length(bytes[0]);
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}
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