mirror of https://github.com/arendst/Tasmota.git
240 lines
6.9 KiB
C++
240 lines
6.9 KiB
C++
/*
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support_buffer.ino - Static binary buffer for Zigbee on Tasmota
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Copyright (C) 2020 Theo Arends and Stephan Hadinger
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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typedef struct SBuffer_impl {
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uint16_t size; // size in bytes of the buffer
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uint16_t len; // current size of the data in buffer. Invariant: len <= size
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uint8_t buf[]; // the actual data
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} SBuffer_impl;
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typedef class SBuffer {
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protected:
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SBuffer(void) {
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// unused empty constructor except from subclass
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}
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public:
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SBuffer(const size_t size) {
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_buf = (SBuffer_impl*) new char[size+4]; // add 4 bytes for size and len
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_buf->size = size;
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_buf->len = 0;
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//*((uint32_t*)_buf) = size; // writing both size and len=0 in a single 32 bits write
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}
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inline size_t getSize(void) const { return _buf->size; }
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inline size_t size(void) const { return _buf->size; }
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inline size_t getLen(void) const { return _buf->len; }
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inline size_t len(void) const { return _buf->len; }
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inline uint8_t *getBuffer(void) const { return _buf->buf; }
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inline uint8_t *buf(size_t i = 0) const { return &_buf->buf[i]; }
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inline char *charptr(size_t i = 0) const { return (char*) &_buf->buf[i]; }
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virtual ~SBuffer(void) {
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delete[] _buf;
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}
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inline void setLen(const size_t len) {
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uint16_t old_len = _buf->len;
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_buf->len = (len <= _buf->size) ? len : _buf->size;
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if (old_len < _buf->len) {
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memset((void*) &_buf->buf[old_len], 0, _buf->len - old_len);
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}
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}
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void set8(const size_t offset, const uint8_t data) {
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if (offset < _buf->len) {
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_buf->buf[offset] = data;
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}
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}
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size_t add8(const uint8_t data) { // append 8 bits value
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if (_buf->len < _buf->size) { // do we have room for 1 byte
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_buf->buf[_buf->len++] = data;
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}
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return _buf->len;
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}
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size_t add16(const uint16_t data) { // append 16 bits value
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if (_buf->len < _buf->size - 1) { // do we have room for 2 bytes
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_buf->buf[_buf->len++] = data;
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_buf->buf[_buf->len++] = data >> 8;
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}
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return _buf->len;
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}
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size_t add32(const uint32_t data) { // append 32 bits value
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if (_buf->len < _buf->size - 3) { // do we have room for 4 bytes
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_buf->buf[_buf->len++] = data;
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_buf->buf[_buf->len++] = data >> 8;
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_buf->buf[_buf->len++] = data >> 16;
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_buf->buf[_buf->len++] = data >> 24;
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}
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return _buf->len;
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}
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size_t add64(const uint64_t data) { // append 64 bits value
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if (_buf->len < _buf->size - 7) { // do we have room for 8 bytes
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_buf->buf[_buf->len++] = data;
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_buf->buf[_buf->len++] = data >> 8;
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_buf->buf[_buf->len++] = data >> 16;
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_buf->buf[_buf->len++] = data >> 24;
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_buf->buf[_buf->len++] = data >> 32;
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_buf->buf[_buf->len++] = data >> 40;
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_buf->buf[_buf->len++] = data >> 48;
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_buf->buf[_buf->len++] = data >> 56;
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}
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return _buf->len;
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}
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size_t addBuffer(const SBuffer &buf2) {
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if (len() + buf2.len() <= size()) {
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for (uint32_t i = 0; i < buf2.len(); i++) {
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_buf->buf[_buf->len++] = buf2.buf()[i];
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}
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}
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return _buf->len;
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}
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size_t addBuffer(const uint8_t *buf2, size_t len2) {
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if ((buf2) && (len() + len2 <= size())) {
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for (uint32_t i = 0; i < len2; i++) {
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_buf->buf[_buf->len++] = pgm_read_byte(&buf2[i]);
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}
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}
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return _buf->len;
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}
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size_t addBuffer(const char *buf2, size_t len2) {
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if ((buf2) && (len() + len2 <= size())) {
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for (uint32_t i = 0; i < len2; i++) {
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_buf->buf[_buf->len++] = pgm_read_byte(&buf2[i]);
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}
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}
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return _buf->len;
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}
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uint8_t get8(size_t offset) const {
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if (offset < _buf->len) {
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return _buf->buf[offset];
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} else {
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return 0;
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}
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}
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uint8_t read8(const size_t offset) const {
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if (offset < len()) {
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return _buf->buf[offset];
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}
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return 0;
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}
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uint16_t get16(const size_t offset) const {
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if (offset < len() - 1) {
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return _buf->buf[offset] | (_buf->buf[offset+1] << 8);
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}
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return 0;
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}
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uint32_t get32(const size_t offset) const {
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if (offset < len() - 3) {
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return _buf->buf[offset] | (_buf->buf[offset+1] << 8) |
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(_buf->buf[offset+2] << 16) | (_buf->buf[offset+3] << 24);
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}
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return 0;
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}
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uint64_t get64(const size_t offset) const {
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if (offset < len() - 7) {
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return (uint64_t)_buf->buf[offset] | ((uint64_t)_buf->buf[offset+1] << 8) |
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((uint64_t)_buf->buf[offset+2] << 16) | ((uint64_t)_buf->buf[offset+3] << 24) |
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((uint64_t)_buf->buf[offset+4] << 32) | ((uint64_t)_buf->buf[offset+5] << 40) |
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((uint64_t)_buf->buf[offset+6] << 48) | ((uint64_t)_buf->buf[offset+7] << 56);
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}
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return 0;
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}
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// if no NULL is found, returns length until the end of the buffer
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inline size_t strlen(const size_t offset) const {
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return strnlen((const char*) &_buf->buf[offset], len() - offset);
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}
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size_t strlen_s(const size_t offset) const {
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size_t slen = this->strlen(offset);
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if (slen == len() - offset) {
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return 0; // we didn't find a NULL char
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} else {
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return slen;
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}
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}
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SBuffer subBuffer(const size_t start, size_t len) const {
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if (start >= _buf->len) {
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len = 0;
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} else if (start + len > _buf->len) {
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len = _buf->len - start;
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}
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SBuffer buf2(len);
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memcpy(buf2.buf(), buf()+start, len);
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buf2._buf->len = len;
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return buf2;
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}
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static SBuffer SBufferFromHex(const char *hex, size_t len) {
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size_t buf_len = (len + 3) / 2;
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SBuffer buf2(buf_len);
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uint8_t val;
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for (; len > 1; len -= 2) {
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val = asc2byte(*hex++) << 4;
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val |= asc2byte(*hex++);
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buf2.add8(val);
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}
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return buf2;
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}
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protected:
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static uint8_t asc2byte(char chr) {
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uint8_t rVal = 0;
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if (isdigit(chr)) { rVal = chr - '0'; }
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else if (chr >= 'A' && chr <= 'F') { rVal = chr + 10 - 'A'; }
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else if (chr >= 'a' && chr <= 'f') { rVal = chr + 10 - 'a'; }
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return rVal;
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}
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static void unHex(const char* in, uint8_t *out, size_t len) {
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}
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protected:
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SBuffer_impl * _buf;
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} SBuffer;
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typedef class PreAllocatedSBuffer : public SBuffer {
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public:
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PreAllocatedSBuffer(const size_t size, void * buffer) {
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_buf = (SBuffer_impl*) buffer;
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_buf->size = size - 4;
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_buf->len = 0;
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}
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~PreAllocatedSBuffer(void) {
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// don't deallocate
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_buf = nullptr;
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}
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} PreAllocatedSBuffer;
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