2a:I[49813,["/_next/static/chunks/3z--bwudlglfp.js","/_next/static/chunks/2u04xn-9yg2co.js","/_next/static/chunks/1b5-8ftwqgmtb.js","/_next/static/chunks/3nqo6bdos11l6.js","/_next/static/chunks/0fz0mlrjifmq7.js","/_next/static/chunks/2l43yyot7shmw.js","/_next/static/chunks/29v1ttach42xh.js","/_next/static/chunks/2ziic7alkvd8r.js","/_next/static/chunks/1hplpmn3-d0tx.js"],"CodeWorkspace"] 2b:T144b,/** * Copyright (c) 2011-2026 libbitcoin developers * * This file is part of libbitcoin. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . */ // Sponsored in part by Digital Contract Design, LLC #ifndef LIBBITCOIN_SYSTEM_STREAM_STREAMERS_BIT_READER_IPP #define LIBBITCOIN_SYSTEM_STREAM_STREAMERS_BIT_READER_IPP #include #include #include #include namespace libbitcoin { namespace system { // constructors // ---------------------------------------------------------------------------- // protected template bit_reader::bit_reader() NOEXCEPT : base(), byte_(base::pad()), offset_(byte_bits) { } template bit_reader::bit_reader(IStream& source) NOEXCEPT : base(source), byte_(base::pad()), offset_(byte_bits) { } // bits // ---------------------------------------------------------------------------- template bool bit_reader::read_bit() NOEXCEPT { // load resets offset_ to zero. if (is_zero(shift())) load(); // Extract bit from byte. return get_left(byte_, offset_++); } template uint64_t bit_reader::read_bits(size_t bits) NOEXCEPT { uint64_t out = 0; bits = lesser(bc::bits, bits); // 'bits' refers to the count of the rightmost bits in 'out'. // Those bits are written from left to right using a right-relative offset. // Subtract one for size-to-index translation, avoiding iterator underflow. for (auto bit = bits; !is_zero(bit); --bit) set_right_into(out, sub1(bit), read_bit()); return out; } template void bit_reader::skip_bit() NOEXCEPT { // load resets offset_ to zero. if (is_zero(shift())) load(); ++offset_; } template void bit_reader::skip_bits(size_t bits) NOEXCEPT { while (!is_zero(bits--)) skip_bit(); } template void bit_reader::rewind_bit() NOEXCEPT { // reload resets offset_ to byte_bits. if (is_zero(offset_)) reload(); --offset_; } template void bit_reader::rewind_bits(size_t bits) NOEXCEPT { while (!is_zero(bits--)) rewind_bit(); } // protected overrides // ---------------------------------------------------------------------------- template uint8_t bit_reader::do_peek_byte() NOEXCEPT { if (is_zero(offset_)) return peek(); // Merge the peeked byte with the buffered byte. return (byte_ << offset_) | (peek() >> shift()); } template void bit_reader::do_read_bytes(uint8_t* buffer, size_t size) NOEXCEPT { // Suboptimal because shifts each bit and reads single bytes, but simple. for (size_t byte = 0; byte < size; ++byte) buffer[byte] = narrow_cast(read_bits(byte_bits)); } template void bit_reader::do_skip_bytes(size_t size) NOEXCEPT { while (!is_zero(size--)) skip_bits(byte_bits); } template void bit_reader::do_rewind_bytes(size_t size) NOEXCEPT { while (!is_zero(size--)) rewind_bits(byte_bits); } // This is the only use of the offset apart from peek and read. template bool bit_reader::get_exhausted() const NOEXCEPT { if (base::operator!()) return true; return is_zero(shift()) && base::get_exhausted(); } // private // ---------------------------------------------------------------------------- template void bit_reader::load() NOEXCEPT { // The next bit read will be from this byte. offset_ = 0; byte_ = base::pad(); base::do_read_bytes(&byte_, one); } template void bit_reader::reload() NOEXCEPT { offset_ = byte_bits; byte_ = base::pad(); base::do_rewind_bytes(two); base::do_read_bytes(&byte_, one); } // This is the only byte peek. template uint8_t bit_reader::peek() NOEXCEPT { return base::do_peek_byte(); } template uint8_t bit_reader::shift() const NOEXCEPT { // If shift is zero then eight bits have been read, so time to load. // If offset is zero then no bits have been read since last load. return byte_bits - offset_; } } // namespace system } // namespace libbitcoin #endif 13:["$","$L2a",null,{"project":{"id":"cmuidb72x000001s1932ifphv","owner":"libbitcoin","repo":"libbitcoin-system","displayName":"libbitcoin/libbitcoin-system","defaultBranch":"master"},"commit":{"sha":"83147c18e3a80ab2949c2c8a7e3486950d7cfeff","message":"Merge pull request #2109 from evoskuil/master\n\nPerf/chain parse allocations (cherry-picked from PR2090)","authorLogin":"evoskuil","authorName":"Eric 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