targets/Linux/plc_Linux_main_retain.c
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Mon, 30 Jul 2018 19:28:39 +0300
changeset 2256 5927710b5610
parent 2227 f150783ee8e7
child 2499 68f4f2d4516b
permissions -rw-r--r--
Fix non-usable toolbar on wxPython with GTK3+

On GNU/Linux if wxPython uses wxWidget with GTK3+ backend (this is
what most modern distributions do), then size of EditorToolBar was
always to store only one button.
This is because GetBestSize() is updated only after pane is shown and
updated.
The code does work correctly on python-wxgtk3.0 (gtk2 backend) on
GNU/Linux and with wxpython 2.8 on Windows.
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/*
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  This file is part of Beremiz, a Integrated Development Environment for
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  programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
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  See COPYING.runtime
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  Copyright (C) 2018: Sergey Surkov <surkov.sv@summatechnology.ru>
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  Copyright (C) 2018: Andrey Skvortsov <andrej.skvortzov@gmail.com>
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*/
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#ifndef HAVE_RETAIN
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#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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#include "iec_types.h"
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int GetRetainSize(void);
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/* Retain buffer.  */
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FILE *retain_buffer;
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const char rb_file[]      = "retain_buffer_file";
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const char rb_file_bckp[] = "retain_buffer_file.bak";
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/* Retain header struct.  */
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struct retain_info_t {
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	uint32_t retain_size;
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	uint32_t hash_size;
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	uint8_t* hash;
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	uint32_t header_offset;
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	uint32_t header_crc;
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};
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/* Init retain info structure.  */
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struct retain_info_t retain_info;
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/* CRC lookup table and initial state.  */
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uint32_t crc32_table[256];
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uint32_t retain_crc;
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/* Generate CRC32 lookup table.  */
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void GenerateCRC32Table(void)
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{
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	unsigned int i, j;
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	/* Use CRC-32-IEEE 802.3 polynomial 0x04C11DB7 (bit reflected).  */
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	uint32_t poly = 0xEDB88320;
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	for (i = 0; i <= 0xFF; i++)
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	{
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		uint32_t c = i;
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		for (j = 0 ; j < 8 ; j++)
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			c = (c & 1) ? (c >> 1 ) ^ poly : (c >> 1);
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		crc32_table[i] = c;
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	}
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}
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/* Calculate CRC32 for len bytes from pointer buf with init starting value.  */
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uint32_t GenerateCRC32Sum(const void* buf, unsigned int len, uint32_t init)
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{
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	uint32_t crc = ~init;
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	unsigned char* current = (unsigned char*) buf;
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	while (len--)
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		crc = crc32_table[(crc ^ *current++) & 0xFF] ^ (crc >> 8);
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	return ~crc;
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}
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/* Calc CRC32 for retain file byte by byte.  */
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int CheckFileCRC(FILE* file_buffer)
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{
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	/* Set the magic constant for one-pass CRC calc according to ZIP CRC32.  */
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	const uint32_t magic_number = 0x2144df1c;
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	/* CRC initial state.  */
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	uint32_t calc_crc32 = 0;
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	char data_block = 0;
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	while(!feof(file_buffer)){
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		if (fread(&data_block, sizeof(data_block), 1, file_buffer))
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			calc_crc32 = GenerateCRC32Sum(&data_block, sizeof(char), calc_crc32);
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	}
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	/* Compare crc result with a magic number.  */
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	return (calc_crc32 == magic_number) ? 1 : 0;
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}
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/* Compare current hash with hash from file byte by byte.  */
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int CheckFilehash(void)
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{
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	int k;
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	int offset = sizeof(retain_info.retain_size);
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	rewind(retain_buffer);
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	fseek(retain_buffer, offset , SEEK_SET);
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	uint32_t size;
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	fread(&size, sizeof(size), 1, retain_buffer);
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	if (size != retain_info.hash_size)
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		return 0;
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	for(k = 0; k < retain_info.hash_size; k++){
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		uint8_t file_digit;
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		fread(&file_digit, sizeof(char), 1, retain_buffer);
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		if (file_digit != *(retain_info.hash+k))
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			return 0;
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	}
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	return 1;
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}
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void InitRetain(void)
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{
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	int i;
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	/* Generate CRC32 lookup table.  */
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	GenerateCRC32Table();
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	/* Get retain size in bytes */
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	retain_info.retain_size = GetRetainSize();
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	/* Hash stored in retain file as array of char in hex digits
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	   (that's why we divide strlen in two).  */
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	retain_info.hash_size = PLC_ID ? strlen(PLC_ID)/2 : 0;
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	//retain_info.hash_size = 0;
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	retain_info.hash = malloc(retain_info.hash_size);
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	/* Transform hash string into byte sequence.  */
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	for (i = 0; i < retain_info.hash_size; i++) {
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		int byte = 0;
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		sscanf((PLC_ID + i*2), "%02X", &byte);
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		retain_info.hash[i] = byte;
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	}
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	/* Calc header offset.  */
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	retain_info.header_offset = sizeof(retain_info.retain_size) + \
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		sizeof(retain_info.hash_size) + \
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		retain_info.hash_size;
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	/*  Set header CRC initial state.  */
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	retain_info.header_crc = 0;
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	/* Calc crc for header.  */
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	retain_info.header_crc = GenerateCRC32Sum(
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		&retain_info.retain_size,
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		sizeof(retain_info.retain_size),
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		retain_info.header_crc);
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	retain_info.header_crc = GenerateCRC32Sum(
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		&retain_info.hash_size,
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		sizeof(retain_info.hash_size),
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		retain_info.header_crc);
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	retain_info.header_crc = GenerateCRC32Sum(
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		retain_info.hash,
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		retain_info.hash_size,
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		retain_info.header_crc);
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}
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void CleanupRetain(void)
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{
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	/* Free hash memory.  */
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	free(retain_info.hash);
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}
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int CheckRetainFile(const char * file)
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{
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	retain_buffer = fopen(file, "rb");
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	if (retain_buffer) {
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		/* Check CRC32 and hash.  */
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		if (CheckFileCRC(retain_buffer))
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			if (CheckFilehash())
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				return 1;
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		fclose(retain_buffer);
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		retain_buffer = NULL;
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	}
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	return 0;
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}
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int CheckRetainBuffer(void)
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{
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	retain_buffer = NULL;
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	if (!retain_info.retain_size)
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		return 1;
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	/* Check latest retain file.  */
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	if (CheckRetainFile(rb_file))
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		return 1;
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	/* Check if we have backup.  */
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	if (CheckRetainFile(rb_file_bckp))
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		return 1;
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	/* We don't have any valid retain buffer - nothing to remind.  */
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	return 0;
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}
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#ifndef FILE_RETAIN_SAVE_PERIOD_S
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#define FILE_RETAIN_SAVE_PERIOD_S 1.0
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#endif
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static double CalcDiffSeconds(IEC_TIME* t1, IEC_TIME *t2)
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{
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	IEC_TIME dt ={
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		t1->tv_sec  - t2->tv_sec,
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		t1->tv_nsec - t2->tv_nsec
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	};
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	if ((dt.tv_nsec < -1000000000) || ((dt.tv_sec > 0) && (dt.tv_nsec < 0))){
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		dt.tv_sec--;
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		dt.tv_nsec += 1000000000;
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	}
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	if ((dt.tv_nsec > +1000000000) || ((dt.tv_sec < 0) && (dt.tv_nsec > 0))){
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		dt.tv_sec++;
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		dt.tv_nsec -= 1000000000;
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	}
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	return dt.tv_sec + 1e-9*dt.tv_nsec;
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}
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int RetainSaveNeeded(void)
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{
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	int ret = 0;
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	static IEC_TIME last_save;
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	IEC_TIME now;
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	double diff_s;
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	/* no retain */
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	if (!retain_info.retain_size)
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		return 0;
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	/* periodic retain flush to avoid high I/O load */
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	PLC_GetTime(&now);
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	diff_s = CalcDiffSeconds(&now, &last_save);
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	if ((diff_s > FILE_RETAIN_SAVE_PERIOD_S) || ForceSaveRetainReq()) {
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		ret = 1;
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		last_save = now;
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	}
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	return ret;
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}
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void ValidateRetainBuffer(void)
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{
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	if (!retain_buffer)
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		return;
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	/* Add retain data CRC to the end of buffer file.  */
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	fseek(retain_buffer, 0, SEEK_END);
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	fwrite(&retain_crc, sizeof(uint32_t), 1, retain_buffer);
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	/* Sync file buffer and close file.  */
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#ifdef __WIN32
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	fflush(retain_buffer);
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#else
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	fsync(fileno(retain_buffer));
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#endif
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	fclose(retain_buffer);
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	retain_buffer = NULL;
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}
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void InValidateRetainBuffer(void)
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{
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	if (!RetainSaveNeeded())
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		return;
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	/* Rename old retain file into *.bak if it exists.  */
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	rename(rb_file, rb_file_bckp);
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	/* Set file CRC initial value.  */
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	retain_crc = retain_info.header_crc;
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	/* Create new retain file.  */
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	retain_buffer = fopen(rb_file, "wb+");
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	if (!retain_buffer) {
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		fprintf(stderr, "Failed to create retain file : %s\n", rb_file);
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		return;
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	}
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	/* Write header to the new file.  */
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	fwrite(&retain_info.retain_size,
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		sizeof(retain_info.retain_size), 1, retain_buffer);
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	fwrite(&retain_info.hash_size,
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		sizeof(retain_info.hash_size),   1, retain_buffer);
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	fwrite(retain_info.hash ,
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		sizeof(char), retain_info.hash_size, retain_buffer);
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}
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void Retain(unsigned int offset, unsigned int count, void *p)
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{
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	if (!retain_buffer)
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		return;
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	/* Generate CRC 32 for each data block.  */
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	retain_crc = GenerateCRC32Sum(p, count, retain_crc);
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	/* Save current var in file.  */
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	fseek(retain_buffer, retain_info.header_offset+offset, SEEK_SET);
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	fwrite(p, count, 1, retain_buffer);
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}
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void Remind(unsigned int offset, unsigned int count, void *p)
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{
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	/* Remind variable from file.  */
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	fseek(retain_buffer, retain_info.header_offset+offset, SEEK_SET);
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	fread((void *)p, count, 1, retain_buffer);
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}
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#endif // !HAVE_RETAIN