From 822b3e760e4840dc688a840610379d977cec7b0c Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Tue, 2 Oct 2007 06:50:43 +0000
Subject: include the ucf font compiler and the ytty font in uuterm repository,
 incorporating a simple nonrecursive build system for the font.

---
 ucfcomp.c | 210 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 210 insertions(+)
 create mode 100644 ucfcomp.c

(limited to 'ucfcomp.c')

diff --git a/ucfcomp.c b/ucfcomp.c
new file mode 100644
index 0000000..d607a43
--- /dev/null
+++ b/ucfcomp.c
@@ -0,0 +1,210 @@
+#include <ctype.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+struct gmap
+{
+	struct gmap *next, *prev;
+	int glyph;
+	int width;
+	unsigned char rules[4*8];
+	int len;
+	int offset;
+};
+
+static struct gmap *ctab[0x30000];
+
+#define GMAP_WIDTH         1
+
+#define GMAP_FINAL1        0
+#define GMAP_FINAL2        1
+#define GMAP_GLYPH1        2
+#define GMAP_GLYPH2        3
+
+#define RULE_RANGE         4
+#define RULE_ATTACHED_TO   5
+#define RULE_WITH_ATTACHED 6
+#define RULE_FOLLOWS       7
+#define RULE_PRECEDES      8
+
+#define CTAB_MASK          0x3fffffff
+#define CTAB_INDIRECT      0x80000000
+#define CTAB_WIDTH         30
+
+static void put_u32(int n)
+{
+	putchar(n>>24);
+	putchar(n>>16);
+	putchar(n>>8);
+	putchar(n);
+}
+
+int main()
+{
+	char buf[256], *s;
+	int i;
+	int ch;
+	struct gmap *gm;
+	int type, begin, len;
+	int w=8, h=16;
+	unsigned char gbuf[32];
+	char tmp[3];
+	int width;
+	int nglyphs = 0;
+	unsigned char *glyphs = 0;
+	struct { unsigned begin, len, rel; } *ranges = 0;
+	int nranges = 0;
+	int ctab_len = 0;
+	int gmap_len = 0;
+
+	while ((s=fgets(buf, sizeof buf, stdin))) {
+		if (*s++ != ':') continue;
+		for (tmp[2]=i=0; i<sizeof gbuf && isxdigit(tmp[0]=*s++) && isxdigit(tmp[1]=*s++); i++)
+			gbuf[i] = strtol(tmp, NULL, 16);
+		if (i == 32) {
+			unsigned char gbuf_tmp[32];
+			width = 2;
+			for (i=0; i<16; i++) gbuf_tmp[i] = gbuf[2*i];
+			for (i=0; i<16; i++) gbuf_tmp[16+i] = gbuf[2*i+1];
+			memcpy(gbuf, gbuf_tmp, 32);
+		} else if (i == 16) { width = 1;
+		} else exit(1);
+		glyphs = realloc(glyphs, 16*(width+nglyphs));
+		memcpy(glyphs + 16*nglyphs, gbuf, 16*width);
+		nglyphs += width;
+		for (;;) {
+			for (; isspace(*s); s++);
+			if (!*s) break;
+			ch = strtol(s, &s, 16);
+			gm = calloc(1, sizeof(struct gmap));
+			gm->glyph = nglyphs-width;
+			gm->width = width;
+			gm->next = 0;
+			gm->prev = ctab[ch];
+			if (ctab[ch]) ctab[ch]->next = gm;
+			ctab[ch] = gm;
+			i=0;
+			while(i<sizeof(gm->rules)-12 && *s && !isspace(*s)) {
+				switch (*s++) {
+				case '+': type = RULE_WITH_ATTACHED; break;
+				case '-': type = RULE_ATTACHED_TO; break;
+				case '<': type = RULE_PRECEDES; break;
+				case '>': type = RULE_FOLLOWS; break;
+				default: exit(1);
+				}
+				if (*s == '[') {
+					begin = strtol(++s, &s, 16);
+					if (*s++ != '-') exit(1);
+					len = strtol(s, &s, 16) - begin + 1;
+					if (*s++ != ']') exit(1);
+					gm->rules[i++] = type;
+					gm->rules[i++] = begin>>16;
+					gm->rules[i++] = begin>>8;
+					gm->rules[i++] = begin;
+					gm->rules[i++] = RULE_RANGE;
+					gm->rules[i++] = len>>16;
+					gm->rules[i++] = len>>8;
+					gm->rules[i++] = len;
+				} else if (isxdigit(*s)) {
+					begin = strtol(s, &s, 16);
+					gm->rules[i++] = type;
+					gm->rules[i++] = begin>>16;
+					gm->rules[i++] = begin>>8;
+					gm->rules[i++] = begin;
+				} else exit(1);
+			}
+			gm->rules[i++] = GMAP_GLYPH1 | (gm->width-1);
+			gm->rules[i++] = (gm->glyph)>>16;
+			gm->rules[i++] = (gm->glyph)>>8;
+			gm->rules[i++] = (gm->glyph);
+			gm->len = i;
+		}
+	}
+
+	/* Count total glyph mapping rules and figure the table offsets */
+	for (ch=0; ch < sizeof(ctab)/sizeof(ctab[0]); ch++) {
+		for (gm = ctab[ch]; gm && gm->prev; gm = gm->prev);
+		/* Exclude rules that can be replaced by a trivial mapping */
+		if (!gm || (!gm->next && gm->len == 4)) {
+			if (gm) gm->len = 0;
+			continue;
+		}
+		for (ctab[ch] = gm; gm; gm = gm->next) {
+			/* Terminate the rules list */
+			if (!gm->next) gm->rules[gm->len-4] &= GMAP_WIDTH;
+			gm->offset = gmap_len;
+			gmap_len += gm->len;
+		}
+	}
+
+	/* Compact empty intervals and intervals with trivial glyph mapping */
+	begin = 1;
+	for (ch=1; ch <= sizeof(ctab)/sizeof(ctab[0]); ch++) {
+		if (ch == sizeof(ctab)/sizeof(ctab[0])
+		 || (ctab[ch-1] != ctab[ch]
+		 &&(!ctab[ch-1] || !ctab[ch]
+		 || ctab[ch-1]->prev || ctab[ch-1]->len > 4
+		 || ctab[ch]->prev   || ctab[ch]->len > 4
+		 || ctab[ch]->glyph != ctab[ch-1]->glyph + ctab[ch-1]->width
+		 || ctab[ch]->width != ctab[ch-1]->width))) {
+			if (ch - begin >= 1024) {
+				ranges = realloc(ranges, sizeof(ranges[0])*(nranges+1));
+				ranges[nranges].begin = begin;
+				ranges[nranges++].len = ch-begin;
+			}
+			begin = ch+1;
+		}
+	}
+	ranges[nranges-1].len = 0x110000;
+
+	/* Count total size of the character table */
+	ranges[0].rel = ranges[0].begin;
+	ctab_len = 1 + nranges*2 + ranges[0].begin;
+	for (i=1; i<nranges; i++)
+		ctab_len += ranges[i].rel = ranges[i].begin - (ranges[i-1].begin+ranges[i-1].len);
+	ctab_len *= 4;
+
+	// offset 0: magic and version (0.1.0.0)
+	fwrite("ucf\300\000\001\000\000", 1, 8, stdout);
+	// offset 8
+	putchar(8);
+	putchar(16);
+	putchar(0);
+	putchar(0);
+	putchar(0);
+	putchar(0);
+	putchar(0);
+	putchar(0);
+	// offset 16
+	put_u32(0); // metadata offset
+	put_u32(32); // ctab offset
+	put_u32(32+ctab_len); // gmap offset
+	put_u32(32+ctab_len+gmap_len); // glyph bitmaps
+	// offset 32
+	put_u32(nranges);
+	for (i=0; i<nranges; i++) {
+		put_u32(ranges[i].rel);
+		put_u32(ranges[i].len);
+	}
+	for (i=ch=0; ch<sizeof(ctab)/sizeof(ctab[0]); ch++) {
+		if (ch == ranges[i].begin) {
+			ch += ranges[i++].len-1;
+			continue;
+		}
+		if (!ctab[ch])
+			put_u32(-1);
+		else if (ctab[ch]->len == 0)
+			put_u32(ctab[ch]->glyph | ctab[ch]->width-1<<30);
+		else
+			put_u32(ctab[ch]->offset | 0x80000000);
+	}
+	// offset 32 + ctab_len
+	for (ch=0; ch < sizeof(ctab)/sizeof(ctab[0]); ch++)
+		for (gm = ctab[ch]; gm; gm = gm->next)
+			fwrite(gm->rules, 1, gm->len, stdout);
+	// offset 30 + ctab_len + gmap_len
+	fwrite(glyphs, 16, nglyphs, stdout);
+
+	return 0;
+}
-- 
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