52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
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#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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void
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decode_byte(FILE *fp, char *res, unsigned char c)
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{
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if(c & 0x80) {
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if(c & 0x40) { /* DICT3 */
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unsigned short length = ((c & 0x3f) << 8 | getc(fp)) + 4;
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unsigned char offset = getc(fp) + 1;
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printf("DIC3 %04x, %02x\n", length, offset);
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} else { /* DICT2 */
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unsigned char length = (c & 0x3f) + 4;
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unsigned char offset = getc(fp) + 1;
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printf("DIC1 %02x, %02x\n", length, offset);
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}
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} else { /* LIT */
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unsigned char i, length = c + 1;
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printf("LIT%02x ", length);
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for(i = 0; i < length; ++i) {
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unsigned char c2 = getc(fp);
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printf("%c", c2 == '\n' ? ' ' : c2);
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}
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printf("\n");
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}
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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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char c, *res;
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FILE *src;
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if(argc == 2 && 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 != 2)
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return error("usage", "ulzdec [-v] compressed.bin");
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if(!(src = fopen(argv[1], "rb")))
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return !error("Invalid input", argv[1]);
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res = malloc(0x10000);
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while((c = getc(src)) != EOF)
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decode_byte(src, res, c);
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return 0;
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}
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