63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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/* cc ulzenc.c -o ulzenc && ./ulzenc example.txt */
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static int
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error(const char *name, const char *msg)
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{
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fprintf(stderr, "%s: %s\n", name, msg);
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return 0;
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}
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char *ptr, *a, mem[0x10000];
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int
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get_lit(int i)
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{
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return 0;
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}
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int
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encode_ulz(FILE *src)
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{
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int i, j, ptr = 0, length = 0;
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a = malloc(0x10000);
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/* load */
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while(fread(a + length, 1, 1, src) && ++length) {}
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/* encode */
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for(i = 0; i < length; i++) {
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/* try to make a CPY */
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/* try to make a LIT */
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for(j = i; j - i < 127 && j < length; j++) {}
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if(i != j) {
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int litlen = j - i;
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/* LIT */
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mem[ptr++] = litlen;
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/* LIT(body) */
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for(j = i; j - i < litlen + 1; j++) mem[ptr++] = a[j];
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}
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i += j - 1;
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}
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return ptr - 1;
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}
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int
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main(int argc, char *argv[])
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{
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int res;
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FILE *src, *dst;
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if(argv[1][0] == '-' && argv[1][1] == 'v')
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return !fprintf(stdout, "Ulzenc - ULZ Encoder, 15 Nov 2023.\n");
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if(argc != 3)
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return error("usage", "ulzenc [-v] a.bin b.ulz ");
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if(!(src = fopen(argv[1], "rb")))
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return !error("Invalid input file", argv[1]);
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res = encode_ulz(src);
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if(!(dst = fopen(argv[2], "wb")))
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return !error("Invalid output file", argv[1]);
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fwrite(&mem, res, 1, dst);
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printf("Compressed %s -> %s(%d bytes).\n", argv[1], argv[2], res);
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return 0;
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} |