Index: trunk/src_3rd/libucdf/COPYING
===================================================================
--- trunk/src_3rd/libucdf/COPYING	(nonexistent)
+++ trunk/src_3rd/libucdf/COPYING	(revision 35414)
@@ -0,0 +1,26 @@
+Copyright (c) 2021 Tibor 'Igor2' Palinkas
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of the Author nor the names of contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
Index: trunk/src_3rd/libucdf/Makefile
===================================================================
--- trunk/src_3rd/libucdf/Makefile	(nonexistent)
+++ trunk/src_3rd/libucdf/Makefile	(revision 35414)
@@ -0,0 +1,7 @@
+CFLAGS = -Wall -g
+
+tester: tester.o ucdf.o
+
+tester.o: tester.c ucdf.h
+
+ucdf.o: ucdf.c ucdf.h
Index: trunk/src_3rd/libucdf/tester.c
===================================================================
--- trunk/src_3rd/libucdf/tester.c	(nonexistent)
+++ trunk/src_3rd/libucdf/tester.c	(revision 35414)
@@ -0,0 +1,20 @@
+#include "ucdf.h"
+int main(int argc, char *argv[])
+{
+	char *fn = "A.PcbDoc";
+	ucdf_file_t ctx = {0};
+
+	if (argc > 1)
+		fn = argv[1];
+
+	if (ucdf_open(&ctx, fn) != 0) {
+		printf("error reading %s: %d (%s)\n", fn, ctx.error, ucdf_error_str[ctx.error]);
+		return -1;
+	}
+
+	printf("CDF header:\n");
+	printf("  ver=%04x rev=%04x %s-endian sect_size=%d,%d\n", ctx.file_ver, ctx.file_rev, ctx.litend ? "little" : "big", ctx.sect_size, ctx.short_sect_size);
+	printf("  sat: %ld+%ld ssat=%ld+%ld msat=%ld+%ld\n", ctx.sat_first, ctx.sat_len, ctx.ssat_first, ctx.ssat_len, ctx.msat_first, ctx.msat_len);
+
+	return 0;
+}
Index: trunk/src_3rd/libucdf/ucdf.c
===================================================================
--- trunk/src_3rd/libucdf/ucdf.c	(nonexistent)
+++ trunk/src_3rd/libucdf/ucdf.c	(revision 35414)
@@ -0,0 +1,170 @@
+/*
+
+ucdf - microlib for reading Composite Document Format files
+
+Copyright (c) 2021 Tibor 'Igor2' Palinkas
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of the Author nor the names of contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
+
+Source code: svn://svn.repo.hu/pcb-rnd/trunk
+Contact the author: http://igor2.repo.hu/contact.html
+
+*/
+
+#include <string.h>
+#include "ucdf.h"
+
+const char *ucdf_error_str[] = {
+	"success",
+	"failed to open file",
+	"failed to read",
+	"wrong file ID",
+	"broken file header",
+	NULL
+};
+
+static const unsigned char hdr_id[8] = { 0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1 };
+
+#define safe_read(dst, len) \
+	do { \
+		if (fread(dst, 1, len, ctx->f) != len) { \
+			ctx->error = UCDF_ERR_READ; \
+			return -1; \
+		} \
+	} while(0)
+
+#define safe_seek(offs) \
+	do { \
+		if (fseek(ctx->f, offs, SEEK_SET) != 0) { \
+			ctx->error = UCDF_ERR_READ; \
+			return -1; \
+		} \
+	} while(0)
+
+#define error(code) \
+	do { \
+		ctx->error = code; \
+		return -1; \
+	} while(0)
+
+static long load_int(ucdf_file_t *ctx, unsigned const char *src, int len)
+{
+	int n;
+	long tmp, res = 0;
+
+	if (ctx->litend) {
+		for(n = 0; n < len; n++,src++) {
+			tmp = *src;
+			tmp >>= n;
+			res |= tmp;
+		}
+	}
+	else {
+		for(; len > 0; len--,src++) {
+			res <<= 8;
+			res |= *src;
+		}
+	}
+	return res;
+}
+
+static int ucdf_read_hdr(ucdf_file_t *ctx)
+{
+	unsigned char buff[16];
+
+	safe_read(buff, sizeof(hdr_id));
+	if (memcmp(buff, hdr_id, sizeof(hdr_id)) != 0)
+		error(UCDF_ERR_BAD_ID);
+
+	/* figure the byte order @28 */
+	safe_seek(28);
+	safe_read(buff, 2);
+	if ((buff[0] == 0xFE) || (buff[1] == 0xFF))
+		ctx->litend = 1;
+	else if ((buff[0] == 0xFF) || (buff[1] == 0xFE))
+		ctx->litend = 0;
+	else
+		error(UCDF_ERR_BAD_HDR);
+
+	/* sector sizes @30 */
+	safe_read(buff, 2);
+	ctx->ssz = load_int(ctx, buff, 2);
+	if (ctx->ssz < 7)
+		error(UCDF_ERR_BAD_HDR);
+	ctx->sect_size = 1 << ctx->ssz;
+	safe_read(buff, 2);
+	ctx->sssz = load_int(ctx, buff, 2);
+	if (ctx->sssz > ctx->ssz)
+		error(UCDF_ERR_BAD_HDR);
+	ctx->short_sect_size = 1 << ctx->sssz;
+
+	/* allocation table info @44 */
+	safe_seek(44);
+	safe_read(buff, 4);
+	ctx->sat_len = load_int(ctx, buff, 4);
+	safe_read(buff, 4);
+	ctx->sat_first = load_int(ctx, buff, 4);
+
+	safe_seek(60);
+	safe_read(buff, 4);
+	ctx->ssat_first = load_int(ctx, buff, 4);
+	safe_read(buff, 4);
+	ctx->ssat_len = load_int(ctx, buff, 4);
+	safe_read(buff, 4);
+	ctx->msat_first = load_int(ctx, buff, 4);
+	safe_read(buff, 4);
+	ctx->msat_len = load_int(ctx, buff, 4);
+
+	/* versions @24 */
+	safe_seek(24);
+	safe_read(buff, 2);
+	ctx->file_rev = load_int(ctx, buff, 2);
+	safe_read(buff, 2);
+	ctx->file_ver = load_int(ctx, buff, 2);
+
+
+	return 0;
+}
+
+
+int ucdf_open(ucdf_file_t *ctx, const char *path)
+{
+	ctx->f = fopen(path, "rb");
+	if (ctx->f == NULL) {
+		ctx->error = UCDF_ERR_OPEN;
+		return -1;
+	}
+
+	if (ucdf_read_hdr(ctx) != 0)
+		goto error;
+
+	return 0;
+
+	error:;
+	fclose(ctx->f);
+	ctx->f = NULL;
+	return -1;
+}
Index: trunk/src_3rd/libucdf/ucdf.h
===================================================================
--- trunk/src_3rd/libucdf/ucdf.h	(nonexistent)
+++ trunk/src_3rd/libucdf/ucdf.h	(revision 35414)
@@ -0,0 +1,35 @@
+#include <stdio.h>
+
+typedef enum {
+	UCDF_SECT_FREE = -1,
+	UCDF_SECT_EOC  = -2, /* end of chain */
+	UCDF_SECT_SAT  = -3, /* sector allocation table */
+	UCDF_SECT_MSAT = -4, /* master sector allocation table */
+} ucdf_spec_sect_id_t;
+
+typedef enum {
+	UCDF_ERR_SUCCESS = 0,
+	UCDF_ERR_OPEN,
+	UCDF_ERR_READ,
+	UCDF_ERR_BAD_ID,
+	UCDF_ERR_BAD_HDR
+} ucdf_error_t;
+
+extern const char *ucdf_error_str[]; /* indexed by ucdf_error_t */
+
+typedef struct {
+	ucdf_error_t error; /* last error experienced in parsing */
+	int file_ver, file_rev, sect_size, short_sect_size;
+
+	unsigned litend:1;  /* set if file is little endian */
+
+	/* cache/interanl */
+	FILE *f; /* the file we are reading from */
+	int ssz, sssz;
+	long sat_len, sat_first;
+	long ssat_len, ssat_first; /* short allocation table */
+	long msat_len, msat_first; /* master allocation table */
+} ucdf_file_t;
+
+int ucdf_open(ucdf_file_t *ctx, const char *path);
+