+++ /dev/null
-#pragma once
-/******************************************************************************
-*
-* Copyright (c) 2019 AT&T Intellectual Property.
-* Copyright (c) 2018-2019 Nokia.
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-* http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*
-*******************************************************************************/
-
-// Standard Includes: ANSI C/C++, MSA, and Third-Party Libraries
-#include <cstring>
-
-// Local Includes: Application specific classes, functions, and libraries
-#include "asn/error_context.hpp"
-#include "value_traits.hpp"
-
-//#define CODEC_BIT_TRACE_ENABLE
-#ifdef CODEC_BIT_TRACE_ENABLE
- #define CODEC_BIT_TRACE(FMT, args...) printf("%s[%u]:" FMT "\n", std::strrchr(__FILE__, '/') + 1, __LINE__, ##args)
-#else
- #define CODEC_BIT_TRACE(...)
-#endif
-
-namespace asn {
-
-template <class IE, class VALUE, bool LSB>
-struct bit_accessor;
-
-template <bool LSB>
-struct bit_accessor_cross_byte;
-
-template <typename PTR>
-class buffer
-{
-public:
- typedef PTR pointer;
-
- explicit buffer(error_context& err)
- : m_errCtx(err)
- {}
-
- void reset(pointer data, u32 size)
- {
- m_start = data;
- m_end = m_start + size;
- m_current = m_start;
- m_shift = 0;
- }
-
- u32 getOffset() const { return begin() - m_start; }
-
- u32 getBytesLeft() const { return end() - begin(); }
- u32 getBytesUsed() const { return getOffset() + (get_shift() ? 1 : 0); }
-
- u8 get_shift() const { return m_shift; }
- void reset_shift() { m_shift = 0; }
- void byte_align() { if (get_shift()) { m_shift = 0; ++m_current; } }
-
- pointer advance(u32 delta) { pointer p = begin(); m_current += delta; return p; }
-
- pointer begin() const { return m_current; }
-
- void set_begin(pointer ptr, u8 bit_shift)
- {
- if (m_start <= ptr && ptr <= end())
- {
- m_current = ptr;
- m_shift = bit_shift;
- }
- }
-
- pointer end() const { return m_end; }
- void set_end(pointer v) { m_end = v; }
-
- bool checkAlignment(char const* name, u8 const mask = 0xFF)
- {
- if (0 == (get_shift() & mask)) return true;
- m_errCtx.alignmentError(name, get_shift());
- return false;
- }
-
- bool checkBytesLeft(char const* name, u32 const num_bytes)
- {
- if (getBytesLeft() >= num_bytes) return true;
- m_errCtx.lengthErrorBytes(name, getBytesLeft(), num_bytes);
- return false;
- }
-
- bool checkBitsLeft(char const* name, u32 const num_bits)
- {
- if (getBitsLeft() >= num_bits) return true;
- m_errCtx.lengthErrorBits(name, getBitsLeft(), num_bits);
- return false;
- }
-
- bool checkBytesAndAlignment(char const* name, u32 const num_bytes, u8 const mask = 0xFF)
- {
- if (getBytesLeft() >= num_bytes)
- {
- if (0 == (get_shift() & mask)) return true;
- m_errCtx.alignmentError(name, get_shift());
- }
- else
- {
- m_errCtx.lengthErrorBytes(name, getBytesLeft(), num_bytes);
- }
- return false;
- }
-
- pointer getBytes(char const* name, u32 num_bytes)
- {
- if (checkBytesAndAlignment(name, num_bytes))
- {
- return advance(num_bytes);
- }
- return nullptr;
- }
-
- //NOTE! num_bytes should be set to minimal number of bytes expected
- pointer getBytes(char const* name, u32 max_requested, u32& num_bytes)
- {
- if (checkAlignment(name))
- {
- u32 const left = getBytesLeft();
- if (left >= num_bytes)
- {
- num_bytes = (left > max_requested) ? max_requested : left;
- return advance(num_bytes);
- }
-
- m_errCtx.lengthErrorBytes(name, getBytesLeft(), num_bytes);
- }
- return nullptr;
- }
-
- bool putByte(char const* name, u8 byte)
- {
- if (checkBytesAndAlignment(name, 1))
- {
- begin()[0] = byte;
- ++m_current;
- return true;
- }
- return false;
- }
-
- bool putBytes(char const* name, void const* in, u32 num_bytes)
- {
- if (checkBytesAndAlignment(name, num_bytes))
- {
- std::memcpy(begin(), in, num_bytes);
- m_current += num_bytes;
- return true;
- }
- return false;
- }
-
- bool checkAlignment(u8 const mask = 0xFF)
- {
- if (0 == (get_shift() & mask)) return true;
- m_errCtx.alignmentError(get_shift());
- return false;
- }
-
- bool checkBytesLeft(u32 const num_bytes)
- {
- if (getBytesLeft() >= num_bytes) return true;
- m_errCtx.lengthErrorBytes(getBytesLeft(), num_bytes);
- return false;
- }
-
- bool checkBitsLeft(u32 const num_bits)
- {
- if (getBitsLeft() >= num_bits) return true;
- m_errCtx.lengthErrorBits(getBitsLeft(), num_bits);
- return false;
- }
-
- bool checkBytesAndAlignment(u32 const num_bytes, u8 const mask = 0xFF)
- {
- if (getBytesLeft() >= num_bytes)
- {
- if (0 == (get_shift() & mask)) return true;
- m_errCtx.alignmentError(get_shift());
- }
- else
- {
- m_errCtx.lengthErrorBytes(getBytesLeft(), num_bytes);
- }
- return false;
- }
-
- pointer getBytes(u32 num_bytes)
- {
- if (checkBytesAndAlignment(num_bytes))
- {
- return advance(num_bytes);
- }
- return nullptr;
- }
-
- //NOTE! num_bytes should be set to minimal number of bytes expected
- pointer getBytes(u32 max_requested, u32& num_bytes)
- {
- if (checkAlignment())
- {
- u32 const left = getBytesLeft();
- if (left >= num_bytes)
- {
- num_bytes = (left > max_requested) ? max_requested : left;
- return advance(num_bytes);
- }
-
- m_errCtx.lengthErrorBytes(getBytesLeft(), num_bytes);
- }
- return nullptr;
- }
-
- bool putByte(u8 byte)
- {
- if (checkBytesAndAlignment(1))
- {
- begin()[0] = byte;
- ++m_current;
- return true;
- }
- return false;
- }
-
- bool putBytes(void const* in, u32 num_bytes)
- {
- if (num_bytes)
- {
- if(checkBytesAndAlignment(num_bytes))
- {
- std::memcpy(begin(), in, num_bytes);
- m_current += num_bytes;
- }
- else
- return false;
- }
- return true;
- }
-
- char const* toString() const
- {
- static char sz[64];
- u8 const* p = begin();
- snprintf(sz, sizeof(sz), "%02X %02X %02X %02X [%02X]=%p@%u..%p -%u bits: +%u bytes", p[-4], p[-3], p[-2], p[-1], p[0], p
- , getOffset(), end(), get_shift(), getBytesLeft());
- return sz;
- }
-
-private:
- template <class IE, class VALUE, bool LSB>
- friend class bit_accessor;
-
- template <bool LSB>
- friend struct bit_accessor_cross_byte;
-
- template <typename U>
- void push_u8(U value) { *m_current++ = static_cast<u8>(value); }
- template <typename U>
- void put_u8(U value) { m_current[0] = static_cast<u8>(value); }
-
-//khxm68: TODO: won't compile without it. WTF?!
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
- u8 get_u8() const { return m_current[0]; }
-#pragma GCC diagnostic pop
- u8 extract_u8(u8 value, u8 mask, u8 shift) const
- { return (get_u8() & ~(mask << shift)) | ((value & mask) << shift); }
-
- u16 get_u16() const { return (static_cast<u16>(m_current[0]) << 8) | m_current[1]; }
- u16 extract_u16(u16 value, u16 mask, u16 shift) const
- { return (get_u16() & ~(mask << shift)) | ((value & mask) << shift); }
-
- u32 get_u24() const { return (static_cast<u32>(m_current[0]) << 16) | (static_cast<u32>(m_current[1]) << 8) | m_current[2]; }
- u32 extract_u24(u32 value, u32 mask, u32 shift) const
- { return (get_u24() & ~(mask << shift)) | ((value & mask) << shift); }
-
- u32 get_u32() const { return (static_cast<u32>(m_current[0]) << 24) | (static_cast<u32>(m_current[1]) << 16) | (static_cast<u32>(m_current[2]) << 8) | m_current[3]; }
- u32 extract_u32(u32 value, u32 mask, u32 shift) const
- { return (get_u32() & ~(mask << shift)) | ((value & mask) << shift); }
-
- u32 getBitsLeft() const { return begin() == end() ? 0 : (getBytesLeft()*8 - get_shift()); }
-
- void bit_advance(u8 num_bits)
- {
- m_shift += num_bits;
- if (get_shift() > 7)
- {
- reset_shift();
- m_current++;
- }
- }
-
- pointer m_current;
- pointer m_end;
- pointer m_start;
- u8 m_shift;
- error_context& m_errCtx;
-};
-
-template <class IE> //LSB 1..7 bits
-struct bit_accessor<IE, stdex::value::_8, true>
-{
- static_assert(IE::length::value > 0 && IE::length::value < 8, "something wrong with traits!");
-
- static void put(u8 value, buffer<u8*>& buf)
- {
- u8 const mask = static_cast<u8>((1u << IE::length::value) - 1);
- u8 const shift = buf.get_shift();
- u8 const data = buf.extract_u8(value, mask, shift);
- buf.put_u8(data);
-
- CODEC_BIT_TRACE("put shift=%u(%u) data[%u]=%02X(%02X) mask=%04X: %s", shift, buf.get_shift()
- , IE::length::value, data, value, mask, buf.toString());
-
- buf.bit_advance(IE::length::value);
- }
-
- static u8 get(buffer<u8 const*>& buf)
- {
- u8 const mask = static_cast<u8>((1u << IE::length::value) - 1);
- u8 const shift = buf.get_shift();
- u8 const data = (buf.get_u8() >> shift) & mask;
-
- CODEC_BIT_TRACE("get shift=%u(%u) data[%u]=%02X mask=%02X: %s", shift, buf.get_shift()
- , IE::length::value, data, mask, buf.toString());
-
- buf.bit_advance(IE::length::value);
- return data;
- }
-};
-
-template <class IE> //LSB 9..15 bits
-struct bit_accessor<IE, stdex::value::_16, true>
-{
- static_assert(IE::length::value > 8 && IE::length::value < 16, "something wrong with traits!");
-
- static void put(u16 value, buffer<u8*>& buf)
- {
- u16 const mask = static_cast<u16>((1u << IE::length::value) - 1);
- u16 const shift = buf.get_shift();
- u16 const data = buf.extract_u16(value, mask, shift);
- buf.push_u8(data >> 8);
- buf.put_u8(data);
-
- CODEC_BIT_TRACE("put shift=%u(%u) data[%u]=%04X(%04X) mask=%04X: %s", shift, buf.get_shift()
- , IE::length::value, data, value, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 8);
- }
-
- static u16 get(buffer<u8 const*>& buf)
- {
- u16 const mask = static_cast<u16>((1u << IE::length::value) - 1);
- u16 const shift = buf.get_shift();
- u16 const data = (buf.get_u16() >> shift) & mask;
- buf.m_current += 1;
-
- CODEC_BIT_TRACE("get shift=%u(%u) data[%u]=%04X mask=%04X: %s", shift, buf.get_shift()
- , IE::length::value, data, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 8);
- return data;
- }
-};
-
-template <class IE> //LSB 17..24 bits
-struct bit_accessor<IE, stdex::value::_24, true>
-{
- static_assert(IE::length::value > 16 && IE::length::value <= 24, "something wrong with traits!");
-
- static void put(u32 value, buffer<u8*>& buf)
- {
- u32 const mask = static_cast<u32>((1u << IE::length::value) - 1);
- u32 const shift = buf.get_shift();
- u32 const data = buf.extract_u24(value, mask, shift);
-
- buf.push_u8(data >> 16);
- buf.push_u8(data >> 8);
- buf.put_u8(data);
-
- CODEC_BIT_TRACE("put shift=%u(%u) data[%u]=%06X(%06X) mask=%06X: %s", shift, buf.get_shift()
- , IE::length::value, data, value, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 16);
- }
-
- static u32 get(buffer<u8 const*>& buf)
- {
- u32 const mask = static_cast<u32>((1u << IE::length::value) - 1);
- u32 const shift = buf.get_shift();
- u32 const data = (buf.get_u24() >> shift) & mask;
- buf.m_current += 2;
-
- CODEC_BIT_TRACE("get shift=%u(%u) data[%u]=%06X mask=%06X: %s", shift, buf.get_shift()
- , IE::length::value, data, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 16);
- return data;
- }
-};
-
-template <class IE> //LSB 25..31 bits
-struct bit_accessor<IE, stdex::value::_32, true>
-{
- static_assert(IE::length::value > 24 && IE::length::value < 32, "something wrong with traits!");
-
- static void put(u32 value, buffer<u8*>& buf)
- {
- u32 const mask = static_cast<u32>((1u << IE::length::value) - 1);
- u32 const shift = buf.get_shift();
- u32 const data = buf.extract_u32(value, mask, shift);
-
- buf.push_u8(data >> 24);
- buf.push_u8(data >> 16);
- buf.push_u8(data >> 8);
- buf.put_u8(data);
-
- CODEC_BIT_TRACE("put shift=%u(%u) data[%u]=%08X(%08X) mask=%08X: %s", shift, buf.get_shift()
- , IE::length::value, data, value, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 24);
- }
-
- static u32 get(buffer<u8 const*>& buf)
- {
- u32 const mask = static_cast<u32>((1u << IE::length::value) - 1);
- u32 const shift = buf.get_shift();
- u32 const data = (buf.get_u32() >> shift) & mask;
- buf.m_current += 3;
-
- CODEC_BIT_TRACE("get shift=%u(%u) data[%u]=%08X mask=%08X: %s", shift, buf.get_shift()
- , IE::length::value, data, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 24);
- return data;
- }
-};
-
-
-template <class IE> //MSB 1..7 bits
-struct bit_accessor<IE, stdex::value::_8, false>
-{
- static_assert(IE::length::value > 0 && IE::length::value < 8, "something wrong with traits!");
-
- static void put(u8 value, buffer<u8*>& buf)
- {
- u8 const mask = static_cast<u8>((1u << IE::length::value) - 1);
- u8 const shift = 8 - buf.get_shift() - IE::length::value;
- u8 const data = buf.extract_u8(value, mask, shift);
- buf.put_u8(data);
-
- CODEC_BIT_TRACE("put shift=%u(%u) data[%u]=%02X(%02X) mask=%04X: %s", shift, buf.get_shift()
- , IE::length::value, data, value, mask, buf.toString());
-
- buf.bit_advance(IE::length::value);
- }
-
- static u8 get(buffer<u8 const*>& buf)
- {
- u8 const mask = static_cast<u8>((1u << IE::length::value) - 1);
- u8 const shift = 8 - buf.get_shift() - IE::length::value;
- u8 const data = (buf.get_u8() >> shift) & mask;
-
- CODEC_BIT_TRACE("get shift=%u(%u) data[%u]=%02X mask=%02X: %s", shift, buf.get_shift()
- , IE::length::value, data, mask, buf.toString());
-
- buf.bit_advance(IE::length::value);
- return data;
- }
-};
-
-template <class IE> //MSB 9..15 bits
-struct bit_accessor<IE, stdex::value::_16, false>
-{
- static_assert(IE::length::value > 8 && IE::length::value < 16, "something wrong with traits!");
-
- static void put(u16 value, buffer<u8*>& buf)
- {
- u16 const mask = static_cast<u16>((1u << IE::length::value) - 1);
- u16 const shift = 16 - buf.get_shift() - IE::length::value;
- u16 const data = buf.extract_u16(value, mask, shift);
-
- buf.push_u8(data >> 8);
- buf.put_u8(data);
-
- CODEC_BIT_TRACE("put shift=%u(%u) data[%u]=%04X(%04X) mask=%04X: %s", shift, buf.get_shift()
- , IE::length::value, data, value, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 8);
- }
-
- static u16 get(buffer<u8 const*>& buf)
- {
- u16 const mask = static_cast<u16>((1u << IE::length::value) - 1);
- u16 const shift = 16 - buf.get_shift() - IE::length::value;
- u16 const data = (buf.get_u16() >> shift) & mask;
- buf.m_current += 1;
-
- CODEC_BIT_TRACE("get shift=%u(%u) data[%u]=%04X mask=%04X: %s", shift, buf.get_shift()
- , IE::length::value, data, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 8);
- return data;
- }
-};
-
-
-template <class IE> //MSB 17..24 bits
-struct bit_accessor<IE, stdex::value::_24, false>
-{
- static_assert(IE::length::value > 16 && IE::length::value <= 24, "something wrong with traits!");
-
- static void put(u32 value, buffer<u8*>& buf)
- {
- u32 const mask = static_cast<u32>((1u << IE::length::value) - 1);
- u32 const shift = 24 - buf.get_shift() - IE::length::value;
- u32 const data = buf.extract_u24(value, mask, shift);
-
- buf.push_u8(data >> 16);
- buf.push_u8(data >> 8);
- buf.put_u8(data);
-
- CODEC_BIT_TRACE("put shift=%u(%u) data[%u]=%06X(%06X) mask=%06X: %s", shift, buf.get_shift()
- , IE::length::value, data, value, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 16);
- }
-
- static u32 get(buffer<u8 const*>& buf)
- {
- u32 const mask = static_cast<u32>((1u << IE::length::value) - 1);
- u32 const shift = 24 - buf.get_shift() - IE::length::value;
- u32 const data = (buf.get_u24() >> shift) & mask;
- buf.m_current += 2;
-
- CODEC_BIT_TRACE("get shift=%u(%u) data[%u]=%06X mask=%06X: %s", shift, buf.get_shift()
- , IE::length::value, data, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 16);
- return data;
- }
-};
-
-template <class IE> //MSB 25..31 bits
-struct bit_accessor<IE, stdex::value::_32, false>
-{
- static_assert(IE::length::value > 24 && IE::length::value < 32, "something wrong with traits!");
-
- static void put(u32 value, buffer<u8*>& buf)
- {
- u32 const mask = static_cast<u32>((1u << IE::length::value) - 1);
- u32 const shift = 32 - buf.get_shift() - IE::length::value;
- u32 const data = buf.extract_u32(value, mask, shift);
-
- buf.push_u8(data >> 24);
- buf.push_u8(data >> 16);
- buf.push_u8(data >> 8);
- buf.put_u8(data);
-
- CODEC_BIT_TRACE("put shift=%u(%u) data[%u]=%08X(%08X) mask=%08X: %s", shift, buf.get_shift()
- , IE::length::value, data, value, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 24);
- }
-
- static u32 get(buffer<u8 const*>& buf)
- {
- u32 const mask = static_cast<u32>((1u << IE::length::value) - 1);
- u32 const shift = 32 - buf.get_shift() - IE::length::value;
- u32 const data = (buf.get_u32() >> shift) & mask;
- buf.m_current += 3;
-
- CODEC_BIT_TRACE("get shift=%u(%u) data[%u]=%08X mask=%08X: %s", shift, buf.get_shift()
- , IE::length::value, data, mask, buf.toString());
-
- buf.bit_advance(IE::length::value - 24);
- return data;
- }
-};
-
-/********************************************************************************
-bit_accessor_cross_byte
-*********************************************************************************/
-template<>
-struct bit_accessor_cross_byte<false> //MSB
-{
- static bool put(u8 value, u8 length, buffer<u8*>& buf)
- {
- u8 spare = 8 - buf.get_shift();
-
- if (spare < length)
- {
- length -= spare;
- u8 chunk = value >> length;
- u8 const mask = static_cast<u8>((1u << spare) - 1);
- u8 data = buf.extract_u8(chunk, mask, 0);
- buf.put_u8(data);
-
- buf.bit_advance(spare);
- }
- if (buf.checkBytesLeft(1))
- {
- u8 const mask = static_cast<u8>((1u << length) - 1);
- u8 const shift = 8 - buf.get_shift() - length;
- u8 data = buf.extract_u8(value, mask, shift);
- buf.put_u8(data);
-
- buf.bit_advance(length);
-
- return true;
- }
- return false;
- }
-
- static u8 get(u8 length, buffer<u8 const*>& buf)
- {
- u8 rval {0};
- u8 const mask = static_cast<u8>((1u << length) - 1);
- u8 const spare = 8 - buf.get_shift();
- if (spare < length)
- {
- length -= spare;
- rval = buf.get_u8() << length;
- buf.bit_advance(spare);
- }
- if (length && buf.checkBytesLeft(1))
- {
- u8 val = buf.get_u8();
- val = val >> (8 - length - buf.get_shift());
- rval |= val;
- rval &= mask;
- buf.bit_advance(length);
- }
- return rval;
- }
-
- static void padByte(buffer<u8*>& buf)
- {
- if (buf.get_shift())
- {
- u8 mask = static_cast<u8>((1u << buf.get_shift()) - 1);
- mask = mask << (8 - buf.get_shift());
- buf.begin()[0] &= mask;
- buf.bit_advance(8 - buf.get_shift());
- }
- }
-
- static void padByte(buffer<u8 const*>& buf)
- {
- if(buf.get_shift())
- buf.bit_advance(8 - buf.get_shift());
- }
-
- static bool put(const u8* in, size_t len, buffer<u8*>& buf, u8 trail_bitsqty)
- {
- if (len)
- {
- if (trail_bitsqty)
- {
- buf.putBytes(in, len - 1);
- u8 last_byte = in[len - 1];
- last_byte = last_byte >> (8 - trail_bitsqty);
- return put(last_byte, trail_bitsqty, buf);
- }
- buf.putBytes(in, len);
- }
- return true;
- }
-};
-
-} //end: namespace asn
-
-
Code Review / sim / e2-interface.git / blobdiff