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+dump
diff --git a/LICENSE b/LICENSE
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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
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+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b58b5e5
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+CFLAGS += -Wall -Wextra
+
+-include config.mk
+
+BINS = dump
+OBJS = cards.o dump.o
+
+dump: cards.o dump.o
+	$(CC) $(LDFLAGS) cards.o dump.o $(LDLIBS) -o dump
+
+$(OBJS): cards.h
+
+clean:
+	rm -f $(BINS) $(OBJS)
diff --git a/cards.c b/cards.c
new file mode 100644
index 0000000..52445a1
--- /dev/null
+++ b/cards.c
@@ -0,0 +1,137 @@
+/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "cards.h"
+
+enum {
+	MZ_NEOff = 0x3C,
+
+	NE_ResTableOff = 0x24,
+
+	ResTable_AlignShift = 0x00,
+	ResTable_ResBlock = 0x02,
+
+	ResBlock_TypeID = 0x00,
+	ResBlock_ResCount = 0x02,
+	ResBlock_Resource = 0x08,
+
+	TypeID_Bitmap = 0x8002,
+
+	Resource_Off = 0x00,
+	Resource_Len = 0x02,
+	Resource_ID = 0x06,
+	Resource_Next = 0x0C,
+
+	IDMask = 0x7FFF,
+
+	BMPHeader_FileLen = 0x02,
+	BMPHeader_Reserved = 0x06,
+	BMPHeader_DataOff = 0x0A,
+	BMPHeader_DIBHeader = 0x0E,
+
+	DIBHeader_Len = 0x00,
+	DIBHeaderCore_Bits = 0x0A,
+
+	DIBHeaderCoreLen = 0x0C,
+};
+
+static uint16_t read16(const uint8_t *ptr, size_t off) {
+	return (uint16_t)ptr[off] | (uint16_t)ptr[off + 1] << 8;
+}
+static uint32_t read32(const uint8_t *ptr, size_t off) {
+	return (uint32_t)ptr[off]
+		| (uint32_t)ptr[off + 1] << 8
+		| (uint32_t)ptr[off + 2] << 16
+		| (uint32_t)ptr[off + 3] << 24;
+}
+
+static void write32(uint8_t *ptr, size_t off, uint32_t val) {
+	ptr[off + 0] = val & 0xFF;
+	ptr[off + 1] = val >> 8 & 0xFF;
+	ptr[off + 2] = val >> 16 & 0xFF;
+	ptr[off + 3] = val >> 24;
+}
+
+int cardsLoad(const uint8_t *ptr, size_t len) {
+	if (len < MZ_NEOff + 2) return -1;
+	if (ptr[0] != 'M' || ptr[1] != 'Z') return -1;
+
+	uint16_t neOff = read16(ptr, MZ_NEOff);
+
+	if (len < neOff + NE_ResTableOff + 2) return -1;
+	if (ptr[neOff + 0] != 'N' || ptr[neOff + 1] != 'E') return -1;
+
+	uint16_t resTableOff = neOff + read16(ptr, neOff + NE_ResTableOff);
+
+	if (len < resTableOff + ResTable_ResBlock) return -1;
+
+	uint16_t alignShift = read16(ptr, resTableOff + ResTable_AlignShift);
+
+	uint16_t resBlockOff = resTableOff + ResTable_ResBlock;
+	uint16_t resCount;
+	for (;;) {
+		if (len < resBlockOff + ResBlock_Resource) return -1;
+
+		uint16_t typeID = read16(ptr, resBlockOff + ResBlock_TypeID);
+		resCount = read16(ptr, resBlockOff + ResBlock_ResCount);
+
+		if (!typeID) return -1;
+		if (typeID == TypeID_Bitmap) break;
+
+		resBlockOff += ResBlock_Resource + resCount * Resource_Next;
+	}
+
+	uint16_t resOff = resBlockOff + ResBlock_Resource;
+	for (uint16_t i = 0; i < resCount; ++i, resOff += Resource_Next) {
+		if (len < resOff + Resource_Next) return -1;
+
+		uint16_t id = read16(ptr, resOff + Resource_ID);
+		if ((id & IDMask) >= CardsLen) continue;
+
+		size_t dataOff = read16(ptr, resOff + Resource_Off);
+		size_t dataLen = read16(ptr, resOff + Resource_Len);
+		dataOff <<= alignShift;
+		dataLen <<= alignShift;
+
+		if (len < dataOff + dataLen) return -1;
+		if (dataLen < DIBHeaderCoreLen) return -1;
+
+		uint32_t dibHeaderLen = read32(ptr, dataOff + DIBHeader_Len);
+		uint32_t bmpFileLen = BMPHeader_DIBHeader + dataLen;
+		uint32_t bmpDataOff = BMPHeader_DIBHeader + dibHeaderLen;
+		if (dibHeaderLen == DIBHeaderCoreLen) {
+			bmpDataOff += 3 * (1 << read16(ptr, dataOff + DIBHeaderCore_Bits));
+		}
+
+		uint8_t *bitmap = malloc(bmpFileLen);
+		if (!bitmap) return -1;
+
+		bitmap[0] = 'B';
+		bitmap[1] = 'M';
+		write32(bitmap, BMPHeader_FileLen, bmpFileLen);
+		write32(bitmap, BMPHeader_Reserved, 0);
+		write32(bitmap, BMPHeader_DataOff, bmpDataOff);
+		memcpy(&bitmap[BMPHeader_DIBHeader], &ptr[dataOff], dataLen);
+
+		cardsData[id & IDMask].ptr = bitmap;
+		cardsData[id & IDMask].len = bmpFileLen;
+	}
+
+	return 0;
+}
diff --git a/cards.h b/cards.h
new file mode 100644
index 0000000..65e3c2b
--- /dev/null
+++ b/cards.h
@@ -0,0 +1,49 @@
+/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef CARDS_H
+#define CARDS_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+enum Cards {
+	CardsClub    = 0x00,
+	CardsDiamond = 0x0D,
+	CardsHeart   = 0x1A,
+	CardsSpade   = 0x27,
+
+	CardsA = 1,
+	Cards2, Cards3, Cards4, Cards5, Cards6, Cards7, Cards8, Cards9, Cards10,
+	CardsJ, CardsQ, CardsK,
+
+	CardsEmpty = 0x35,
+	CardsBack1, CardsBack2, CardsBack3, CardsBack4, CardsBack5, CardsBack6,
+	CardsBack7, CardsBack8, CardsBack9, CardsBack10, CardsBack11, CardsBack12,
+
+	CardsX = 0x43,
+	CardsO,
+	CardsLen,
+};
+
+struct CardsData {
+	uint8_t *ptr;
+	size_t len;
+} cardsData[CardsLen];
+
+int cardsLoad(const uint8_t *ptr, size_t len);
+
+#endif
diff --git a/dump.c b/dump.c
new file mode 100644
index 0000000..0eefc3c
--- /dev/null
+++ b/dump.c
@@ -0,0 +1,67 @@
+/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+
+#include "cards.h"
+
+int main(int argc, char *argv[]) {
+	FILE *file = stdin;
+	if (argc > 1) {
+		file = fopen(argv[1], "r");
+		if (!file) err(EX_NOINPUT, "%s", argv[1]);
+	}
+
+	size_t cap = 4096;
+	void *ptr = malloc(cap);
+	if (!ptr) err(EX_OSERR, "malloc");
+
+	size_t len = 0, read;
+	while (0 < (read = fread(&ptr[len], 1, cap - len, file))) {
+		len += read;
+		if (len < cap) continue;
+		cap *= 2;
+		ptr = realloc(ptr, cap);
+		if (!ptr) err(EX_OSERR, "realloc");
+	}
+	if (ferror(file)) err(EX_IOERR, "fread");
+	fclose(file);
+
+	errno = 0;
+	int error = cardsLoad(ptr, len);
+	if (error && errno) err(EX_OSERR, "cardsLoad");
+	if (error) errx(EX_DATAERR, "cannot load cards");
+
+	for (size_t i = 0; i < CardsLen; ++i) {
+		if (!cardsData[i].ptr) continue;
+
+		char name[sizeof("00.bmp")];
+		snprintf(name, sizeof(name), "%02zd.bmp", i);
+
+		FILE *file = fopen(name, "w");
+		if (!file) err(EX_CANTCREAT, "%s", name);
+
+		fwrite(cardsData[i].ptr, cardsData[i].len, 1, file);
+		if (ferror(file)) err(EX_IOERR, "fwrite");
+
+		error = fclose(file);
+		if (error) err(EX_IOERR, "fclose");
+	}
+}