56 lines
2.2 KiB
C++
56 lines
2.2 KiB
C++
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#include <cstdio>
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#include <cstring>
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#if __BYTE_ORDER__ != 1234
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#error "BAD ENDIAN"
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#endif
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static const char * oname = "table.cpp";
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static const char * const morse_code [] = { /* nedefinované znaky nahrazeny mezrou */
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" ", /* */ " ", /*!*/ ".-..-.", /*"*/ " ", /*#*/ " ", /*$*/
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" ", /*%*/ " ", /*&*/ ".----.", /*'*/ "-.--.", /*(*/ "-.--.-", /*)*/
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" ", /***/ ".-.-.", /*+*/ "--..--", /*,*/ "-....-", /*-*/ ".-.-.-", /*.*/ "-..-." , /*/*/
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"-----", /*0*/ ".----", /*1*/ "..---", /*2*/ "...--", /*3*/ "....-", /*4*/
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".....", /*5*/ "-....", /*6*/ "--...", /*7*/ "---..", /*8*/ "----.", /*9*/
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"---...", /*:*/ "-.-.-.", /*;*/ " ", /*<*/ "-...-" , /*=*/ " ", /*>*/ "..--..", /*?*/
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".--.-.", /*@*/
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".-", /*A*/ "-...", /*B*/ "-.-.", /*C*/ "-..", /*D*/ ".", /*E*/ "..-.", /*F*/
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"--.", /*G*/ "....", /*H*/ "..", /*I*/ ".---", /*J*/ "-.-", /*K*/ ".-..", /*L*/
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"--", /*M*/ "-.", /*N*/ "---", /*O*/ ".--.", /*P*/ "--.-", /*Q*/ ".-.", /*R*/
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"...", /*S*/ "-", /*T*/ "..-", /*U*/ "...-", /*V*/ ".--", /*W*/ "-..-", /*X*/
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"-.--", /*Y*/ "--..", /*Z*/ " ", " ", " ", " ", "..--.-", /*_*/
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};
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union morse_byte {
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struct {
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unsigned char bits : 5; // Jednotlivé bity.
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unsigned char mlen : 3; // A jejich délka - max 6.
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}; // Pokud je 6 nebo 7, pak je nejnižší bit zároveň součástí bitů
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unsigned char byte;
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explicit constexpr morse_byte () noexcept : byte (0u) {}
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};
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static morse_byte compress (const unsigned n) {
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const char * const ptr = morse_code [n];
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const unsigned len = strlen (ptr);
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morse_byte mb;
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if (ptr [0] == ' ') return mb;
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mb.mlen = len;
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for (unsigned n=0; n<len; n++) {
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if (ptr [n] == '-') mb.byte |= (1u << n);
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}
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return mb;
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}
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/* Generátor komprimované tabulky morse kódů */
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int main () {
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FILE * out = fopen(oname, "w");
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if (!out) return 1;
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unsigned n = 0u;
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fprintf(out, "static const unsigned char compressed_table [] = {");
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for (auto & e: morse_code) {
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if ((n & 0xf) == 0u) fprintf(out, "\n");
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fprintf(out, " 0x%02x,", compress(n).byte);
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n += 1u;
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}
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fprintf(out, "\n};\n");
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fclose (out);
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return 0;
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}
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