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	blind-compress.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-compress.c (1552B)
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	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("")
	5
	6 static size_t
	7 compare(const char restrict new, const char restrict old, size_t n, si…
	8 {
	9 size_t i, start1, start2, ptr, same, diff;
	10 for (ptr = i = 0; i < n;) {
	11 for (start1 = i; i < n && old[i] == new[i]; i++);
	12 for (start2 = i; i < n && old[i] != new[i]; i++);
	13 same = start2 - start1;
	14 diff = i - start2;
	15 if (ptr && same < 2 * sizeof(size_t) && same + diff <= S…
	16 (*cmp)[ptr - 1] += same + diff;
	17 } else {
	18 if (ptr + 2 > *cmpsize)
	19 cmp = erealloc2(cmp, *cmpsize += 128, …
	20 (*cmp)[ptr++] = same;
	21 (*cmp)[ptr++] = diff;
	22 }
	23 }
	24 return ptr;
	25 }
	26
	27 int
	28 main(int argc, char *argv[])
	29 {
	30 struct stream stream;
	31 char *buf[2];
	32 size_t parts, part, off;
	33 int i;
	34 size_t *cmp = NULL;
	35 size_t cmpsize = 0;
	36
	37 UNOFLAGS(argc);
	38
	39 eopen_stream(&stream, NULL);
	40 echeck_dimensions(&stream, WIDTH \| HEIGHT, NULL);
	41 fprint_stream_head(stdout, &stream);
	42 efflush(stdout, "<stdout>");
	43
	44 buf[0] = emalloc(stream.frame_size);
	45 buf[1] = ecalloc(1, stream.frame_size);
	46
	47 for (i = 0; eread_frame(&stream, buf[i]); i ^= 1) {
	48 parts = compare(buf[i], buf[i ^ 1], stream.frame_size, &…
	49 for (off = part = 0; part < parts; part += 2) {
	50 off += cmp[part];
	51 ewriteall(STDOUT_FILENO, cmp + part, 2 * sizeof(…
	52 ewriteall(STDOUT_FILENO, buf[i] + off, cmp[part …
	53 off += cmp[part + 1];
	54 }
	55 }
	56
	57 free(cmp);
	58 free(buf[0]);
	59 free(buf[1]);
	60 return 0;
	61 }