54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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/* cc ulzdec.c -o ulzdec && ./ulzdec compressed.bin */
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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 *mem, *ptr;
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int
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decode_ulz(FILE *src)
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{
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char c, *copy;
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short i, length;
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ptr = mem = malloc(0x10000);
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while((c = getc(src)) != EOF) {
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if(c & 0x80) { /* CPY */
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if(c & 0x40)
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length = (c & 0x3f) << 8 | getc(src);
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else
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length = c & 0x3f;
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copy = ptr - (getc(src) + 1);
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for(i = 0; i < length + 4; i++)
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*(ptr++) = *(copy++);
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} else /* LIT */
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for(i = 0; i < c + 1; i++)
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*(ptr++) = getc(src);
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}
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return ptr - mem;
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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, "Ulzdec - ULZ Decoder, 15 Nov 2023.\n");
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if(argc != 3)
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return error("usage", "ulzdec [-v] a.ulz b.bin");
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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 = decode_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("Decompressed %s -> %s(%d bytes).\n", argv[1], argv[2], res);
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return 0;
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} |