mirror of https://github.com/nirenjan/libx52.git
310 lines
8.3 KiB
C
310 lines
8.3 KiB
C
/*
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* Saitek X52 Pro Character Map Parser and Generator
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*
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* This file takes in an input map and converts it to a C file which implements
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* a lookup table to match the input UTF-8 character to the corresponding
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* character map value.
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*
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* Copyright (C) 2015 Nirenjan Krishnan (nirenjan@nirenjan.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "x52_char_map.h"
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struct map_table {
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struct map_table *next;
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uint32_t value_so_far;
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uint16_t type;
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uint8_t value;
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};
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struct map_table *root;
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struct stack_node {
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struct stack_node *next;
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struct map_table *entry;
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uint32_t value;
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};
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struct stack_node *stack;
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/*
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* Convert Unicode code point to UTF-8 bytearray. The bytearray should be
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* at least 8 bytes long to accomodate for the longest possible value of
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* Unicode code point and a terminating NUL byte.
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*/
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static void convert_unichr_to_utf8(int unicode_cp, char *utf8_bytearray)
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{
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if (unicode_cp <= 0x7F) {
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utf8_bytearray[0] = unicode_cp;
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utf8_bytearray[1] = 0;
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} else if (unicode_cp <= 0x7FF) {
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utf8_bytearray[0] = 0xC0 | ((unicode_cp & 0x7C0) >> 6);
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utf8_bytearray[1] = 0x80 | (unicode_cp & 0x03F);
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utf8_bytearray[2] = 0;
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} else if (unicode_cp <= 0xFFFF) {
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utf8_bytearray[0] = 0xE0 | ((unicode_cp & 0xF000) >> 12);
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utf8_bytearray[1] = 0x80 | ((unicode_cp & 0x0FC0) >> 6);
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utf8_bytearray[2] = 0x80 | (unicode_cp & 0x003F);
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utf8_bytearray[3] = 0;
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} else if (unicode_cp <= 0x1FFFFF) {
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utf8_bytearray[0] = 0xF0 | ((unicode_cp & 0x1C0000) >> 18);
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utf8_bytearray[1] = 0x80 | ((unicode_cp & 0x03F000) >> 12);
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utf8_bytearray[2] = 0x80 | ((unicode_cp & 0x000FC0) >> 6);
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utf8_bytearray[3] = 0x80 | (unicode_cp & 0x00003F);
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utf8_bytearray[4] = 0;
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} else if (unicode_cp <= 0x3FFFFFF) {
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utf8_bytearray[0] = 0xF8 | ((unicode_cp & 0x3000000) >> 24);
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utf8_bytearray[1] = 0x80 | ((unicode_cp & 0x0FC0000) >> 18);
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utf8_bytearray[2] = 0x80 | ((unicode_cp & 0x003F000) >> 12);
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utf8_bytearray[3] = 0x80 | ((unicode_cp & 0x0000FC0) >> 6);
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utf8_bytearray[4] = 0x80 | (unicode_cp & 0x000003F);
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utf8_bytearray[5] = 0;
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} else /* if (unicode_cp <= 0x7FFFFFFF) */ {
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utf8_bytearray[0] = 0xFC | ((unicode_cp & 0x40000000) >> 30);
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utf8_bytearray[1] = 0x80 | ((unicode_cp & 0x3F000000) >> 24);
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utf8_bytearray[2] = 0x80 | ((unicode_cp & 0x00FC0000) >> 18);
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utf8_bytearray[3] = 0x80 | ((unicode_cp & 0x0003F000) >> 12);
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utf8_bytearray[4] = 0x80 | ((unicode_cp & 0x00000FC0) >> 6);
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utf8_bytearray[5] = 0x80 | (unicode_cp & 0x0000003F);
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utf8_bytearray[6] = 0;
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}
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}
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static int stack_push(struct map_table *entry, int value)
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{
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struct stack_node *node = calloc(1, sizeof(*node));
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if (!node) {
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fprintf(stderr, "Cannot allocate memory for stack node!\n");
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return 0;
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}
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node->entry = entry;
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node->value = value;
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node->next = stack;
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stack = node;
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return 1;
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}
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static int stack_pop(struct stack_node *node)
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{
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struct stack_node *temp;
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if (stack) {
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*node = *stack;
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temp = stack;
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stack = stack->next;
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free(temp);
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return 1;
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}
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return 0;
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}
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static int add_to_mem(int input_val, int map_val)
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{
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uint8_t bytearray[8];
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int i;
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int value_so_far = 0;
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uint8_t c;
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struct map_table *level;
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struct map_table *temp;
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if (!root) {
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root = calloc(256, sizeof(*root));
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if (!root) {
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fprintf(stderr, "Cannot allocate memory for root node!\n");
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return 0;
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}
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if (!stack_push(root, 0)) {
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return 0;
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}
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}
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convert_unichr_to_utf8(input_val, bytearray);
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level = root;
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for (i = 0; bytearray[i]; i++) {
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c = bytearray[i];
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value_so_far <<= 8;
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value_so_far |= c;
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if (bytearray[i+1]) {
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level[c].type = TYPE_POINTER;
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if (!level[c].next) {
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temp = calloc(256, sizeof(*temp));
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if (!temp) {
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fprintf(stderr, "Cannot allocate memory for entry table!\n");
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return 0;
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}
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if (!stack_push(temp, value_so_far)) {
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return 0;
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}
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level[c].value_so_far = value_so_far;
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level[c].next = temp;
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}
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level = level[c].next;
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} else {
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level[c].type = TYPE_ENTRY;
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level[c].value = map_val;
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}
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}
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return 1;
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}
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/*
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* Parse an input line and return the input value and map value
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* For comment lines, or invalid lines, returned input value is 0.
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*
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* For invalid lines, return value is 0
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* For valid lines, return value is 1
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* For comment lines, return value is 2
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*/
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static int parse_line(char *line, int *input_value, int *map_value)
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{
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const char *format_str1 = " 0x%x 0x%x";
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const char *format_str2 = " 0x%x %c";
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int ret;
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int val1;
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int val2;
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char c;
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/* Strip off leading whitespace */
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while (*line && isspace(*line)) line++;
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/* If line begins with # or is empty, it's a comment line */
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if (line[0] == '#' || line[0] == '\0') {
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/* Comment line */
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*input_value = 0;
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return 2;
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}
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/* Try to match input against format_str1 */
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ret = sscanf(line, format_str1, &val1, &val2);
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if (ret == 2) {
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/* We have a match! */
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*input_value = val1;
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*map_value = val2;
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return 1;
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}
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/* Try to match input against format_str2 */
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ret = sscanf(line, format_str2, &val1, &c);
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if (ret == 2) {
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/* We have a match! */
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*input_value = val1;
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*map_value = c;
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return 1;
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}
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/* Neither format string matched, and it's not a comment line. Abort */
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return 0;
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}
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static void write_output(FILE *dest)
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{
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struct stack_node node;
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int i;
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int start;
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int end;
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while (stack_pop(&node)) {
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if (node.value) {
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fprintf(dest, "static struct map_entry table_%x[64] = {\n", node.value);
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start = 0x80;
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end = 0xC0;
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} else {
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fprintf(dest, "struct map_entry map_root[256] = {\n");
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start = 0;
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end = 256;
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}
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for (i = start; i < end; i++) {
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if (node.entry[i].next) {
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fprintf(dest, "\t[0x%02x] = { table_%x, TYPE_POINTER, 0 },\n",
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i - start, node.entry[i].value_so_far);
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} else if (node.entry[i].type == TYPE_ENTRY) {
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fprintf(dest, "\t[0x%02x] = { NULL, TYPE_ENTRY, 0x%02x },\n",
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i - start, node.entry[i].value);
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}
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}
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fprintf(dest, "};\n\n");
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}
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}
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void dummy(void)
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{
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printf("Dummy function for breakpoint trap\n");
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}
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int main(int argc, char *argv[])
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{
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FILE *input = NULL;
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FILE *output = NULL;
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char buffer[512];
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int rc = 0;
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#define EXIT(v) do { rc = (v); goto exit_handler; } while (0)
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if (argc < 3) {
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fprintf(stderr, "Usage: %s <input-map> <output-c-file>\n", argv[0]);
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return 1;
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}
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input = fopen(argv[1], "r");
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if (!input) {
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fprintf(stderr, "Unable to read input file %s\n", argv[1]);
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EXIT(2);
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}
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output = fopen(argv[2], "w");
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if (!output) {
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fprintf(stderr, "Unable to write output file %s\n", argv[2]);
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EXIT(2);
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}
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while (fgets(buffer, sizeof(buffer), input)) {
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int input_val;
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int map_val;
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if (!parse_line(buffer, &input_val, &map_val)) {
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fprintf(stderr, "Invalid line: %s\n", buffer);
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EXIT(3);
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}
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if (!add_to_mem(input_val, map_val)) {
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EXIT(4);
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}
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}
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/* Write header for output file */
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fputs("/*\n", output);
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fputs(" * Autogenerated character map file for Saitek X52 Pro\n", output);
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fputs(" * Generated from ", output);
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fputs(argv[1], output);
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fputs("\n*/\n\n", output);
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fputs("#include \"x52_char_map.h\"\n", output);
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fputs("\n\n", output);
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write_output(output);
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exit_handler:
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if (output) fclose(output);
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if (input) fclose(input);
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return rc;
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}
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