1 files changed, 476 insertions, 0 deletions
diff --git a/apps/plugins/mikmod/load_umx.c b/apps/plugins/mikmod/load_umx.c
new file mode 100644
index 0000000000..1a0535affd
--- /dev/null
+++ b/apps/plugins/mikmod/load_umx.c
@@ -0,0 +1,476 @@
+/* MikMod sound library
+ * (c) 2003-2004 Raphael Assenat and others - see file
+ * AUTHORS for complete list.
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+/* Epic Games Unreal UMX container loading for libmikmod
+ * Written by O. Sezer <sezero@users.sourceforge.net>
+ *
+ * Records data type/offset info in its Test() function, then acts
+ * as a middle-man, forwarding calls to the real loader units. It
+ * requires that the MREADER implementation in use always respects
+ * its iobase fields. Like all other libmikmod loaders, this code
+ * is not reentrant yet.
+ *
+ * UPKG parsing partially based on Unreal Media Ripper (UMR) v0.3
+ * by Andy Ward <wardwh@swbell.net>, with additional updates
+ * by O. Sezer - see git repo at https://github.com/sezero/umr/
+ *
+ * The cheaper way, i.e. linear search of music object like libxmp
+ * and libmodplug does, is possible. With this however we're using
+ * the embedded offset, size and object type directly from the umx
+ * file, and I feel safer with it.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "mikmod_internals.h"
+
+
+/*========== upkg defs */
+
+typedef SLONG fci_t;		/* FCompactIndex */
+
+#define UPKG_HDR_TAG	0x9e2a83c1
+
+struct _genhist {	/* for upkg versions >= 68 */
+	SLONG export_count;
+	SLONG name_count;
+};
+
+struct upkg_hdr {
+	ULONG tag;	/* UPKG_HDR_TAG */
+	SLONG file_version;
+	ULONG pkg_flags;
+	SLONG name_count;	/* number of names in name table (>= 0) */
+	SLONG name_offset;		/* offset to name table  (>= 0) */
+	SLONG export_count;	/* num. exports in export table  (>= 0) */
+	SLONG export_offset;		/* offset to export table (>= 0) */
+	SLONG import_count;	/* num. imports in export table  (>= 0) */
+	SLONG import_offset;		/* offset to import table (>= 0) */
+
+	/* number of GUIDs in heritage table (>= 1) and table's offset:
+	 * only with versions < 68. */
+	SLONG heritage_count;
+	SLONG heritage_offset;
+	/* with versions >= 68:  a GUID, a dword for generation count
+	 * and export_count and name_count dwords for each generation: */
+	ULONG guid[4];
+	SLONG generation_count;
+#define UPKG_HDR_SIZE 64			/* 64 bytes up until here */
+	/*struct _genhist *gen;*/
+};
+/* compile time assert for upkg_hdr size */
+/*typedef int _check_hdrsize[2 * (offsetof(struct upkg_hdr, gen) == UPKG_HDR_SIZE) - 1];*/
+typedef int _check_hdrsize[2 * (sizeof(struct upkg_hdr) == UPKG_HDR_SIZE) - 1];
+
+/*========== Supported content types */
+
+#define UMUSIC_IT	0
+#define UMUSIC_S3M	1
+#define UMUSIC_XM	2
+#define UMUSIC_MOD	3
+
+static const char *mustype[] = {
+	"IT", "S3M", "XM", "MOD",
+	NULL
+};
+
+/*========== UPKG parsing */
+
+/* decode an FCompactIndex.
+ * original documentation by Tim Sweeney was at
+ * http://unreal.epicgames.com/Packages.htm
+ * also see Unreal Wiki:
+ * http://wiki.beyondunreal.com/Legacy:Package_File_Format/Data_Details
+ */
+static fci_t get_fci (const char *in, int *pos)
+{
+	SLONG a;
+	int size;
+
+	size = 1;
+	a = in[0] & 0x3f;
+
+	if (in[0] & 0x40) {
+		size++;
+		a |= (in[1] & 0x7f) << 6;
+
+		if (in[1] & 0x80) {
+			size++;
+			a |= (in[2] & 0x7f) << 13;
+
+			if (in[2] & 0x80) {
+				size++;
+				a |= (in[3] & 0x7f) << 20;
+
+				if (in[3] & 0x80) {
+					size++;
+					a |= (in[4] & 0x3f) << 27;
+				}
+			}
+		}
+	}
+
+	if (in[0] & 0x80)
+		a = -a;
+
+	*pos += size;
+
+	return a;
+}
+
+static int get_objtype (SLONG ofs, int type)
+{
+	char sig[16];
+_retry:
+	_mm_fseek(modreader, ofs, SEEK_SET);
+	_mm_read_UBYTES(sig, 16, modreader);
+	if (type == UMUSIC_IT) {
+		if (memcmp(sig, "IMPM", 4) == 0)
+			return UMUSIC_IT;
+		return -1;
+	}
+	if (type == UMUSIC_XM) {
+		if (memcmp(sig, "Extended Module:", 16) != 0)
+			return -1;
+		_mm_read_UBYTES(sig, 16, modreader);
+		if (sig[0] != ' ') return -1;
+		_mm_read_UBYTES(sig, 16, modreader);
+		if (sig[5] != 0x1a) return -1;
+		return UMUSIC_XM;
+	}
+
+	_mm_fseek(modreader, ofs + 44, SEEK_SET);
+	_mm_read_UBYTES(sig, 4, modreader);
+	if (type == UMUSIC_S3M) {
+		if (memcmp(sig, "SCRM", 4) == 0)
+			return UMUSIC_S3M;
+		/*return -1;*/
+		/* SpaceMarines.umx and Starseek.umx from Return to NaPali
+		 * report as "s3m" whereas the actual music format is "it" */
+		type = UMUSIC_IT;
+		goto _retry;
+	}
+
+	_mm_fseek(modreader, ofs + 1080, SEEK_SET);
+	_mm_read_UBYTES(sig, 4, modreader);
+	if (type == UMUSIC_MOD) {
+		if (memcmp(sig, "M.K.", 4) == 0 || memcmp(sig, "M!K!", 4) == 0)
+			return UMUSIC_MOD;
+		return -1;
+	}
+
+	return -1;
+}
+
+static int read_export (const struct upkg_hdr *hdr,
+			SLONG *ofs, SLONG *objsize)
+{
+	char buf[40];
+	int idx = 0, t;
+
+	_mm_fseek(modreader, *ofs, SEEK_SET);
+	if (!_mm_read_UBYTES(buf, 40, modreader))
+		return -1;
+
+	if (hdr->file_version < 40) idx += 8;	/* 00 00 00 00 00 00 00 00 */
+	if (hdr->file_version < 60) idx += 16;	/* 81 00 00 00 00 00 FF FF FF FF FF FF FF FF 00 00 */
+	get_fci(&buf[idx], &idx);		/* skip junk */
+	t = get_fci(&buf[idx], &idx);		/* type_name */
+	if (hdr->file_version > 61) idx += 4;	/* skip export size */
+	*objsize = get_fci(&buf[idx], &idx);
+	*ofs += idx;	/* offset for real data */
+
+	return t;	/* return type_name index */
+}
+
+static int read_typname(const struct upkg_hdr *hdr,
+			int idx, char *out)
+{
+	int i, s;
+	long l;
+	char buf[64];
+
+	if (idx >= hdr->name_count) return -1;
+	buf[63] = '\0';
+	for (i = 0, l = 0; i <= idx; i++) {
+		_mm_fseek(modreader, hdr->name_offset + l, SEEK_SET);
+		_mm_read_UBYTES(buf, 63, modreader);
+		if (hdr->file_version >= 64) {
+			s = *(signed char *)buf; /* numchars *including* terminator */
+			if (s <= 0 || s > 64) return -1;
+			l += s + 5;	/* 1 for buf[0], 4 for int32_t name_flags */
+		} else {
+			l += (long)strlen(buf);
+			l +=  5;	/* 1 for terminator, 4 for int32_t name_flags */
+		}
+	}
+
+	strcpy(out, (hdr->file_version >= 64)? &buf[1] : buf);
+	return 0;
+}
+
+static int probe_umx   (const struct upkg_hdr *hdr,
+			SLONG *ofs, SLONG *objsize)
+{
+	int i, idx, t;
+	SLONG s, pos;
+	long fsiz;
+	char buf[64];
+
+	idx = 0;
+	_mm_fseek(modreader, 0, SEEK_END);
+	fsiz = _mm_ftell(modreader);
+
+	/* Find the offset and size of the first IT, S3M or XM
+	 * by parsing the exports table. The umx files should
+	 * have only one export. Kran32.umx from Unreal has two,
+	 * but both pointing to the same music. */
+	if (hdr->export_offset >= fsiz) return -1;
+	memset(buf, 0, 64);
+	_mm_fseek(modreader, hdr->export_offset, SEEK_SET);
+	_mm_read_UBYTES(buf, 64, modreader);
+
+	get_fci(&buf[idx], &idx);	/* skip class_index */
+	get_fci(&buf[idx], &idx);	/* skip super_index */
+	if (hdr->file_version >= 60) idx += 4; /* skip int32 package_index */
+	get_fci(&buf[idx], &idx);	/* skip object_name */
+	idx += 4;			/* skip int32 object_flags */
+
+	s = get_fci(&buf[idx], &idx);	/* get serial_size */
+	if (s <= 0) return -1;
+	pos = get_fci(&buf[idx],&idx);	/* get serial_offset */
+	if (pos < 0 || pos > fsiz - 40) return -1;
+
+	if ((t = read_export(hdr, &pos, &s)) < 0) return -1;
+	if (s <= 0 || s > fsiz - pos) return -1;
+
+	if (read_typname(hdr, t, buf) < 0) return -1;
+	for (i = 0; mustype[i] != NULL; i++) {
+		if (!strcasecmp(buf, mustype[i])) {
+			t = i;
+			break;
+		}
+	}
+	if (mustype[i] == NULL) return -1;
+	if ((t = get_objtype(pos, t)) < 0) return -1;
+
+	*ofs = pos;
+	*objsize = s;
+	return t;
+}
+
+static SLONG probe_header (void *header)
+{
+	struct upkg_hdr *hdr;
+	unsigned char *p;
+	ULONG *swp;
+	int i;
+
+	/* byte swap the header - all members are 32 bit LE values */
+	p = (unsigned char *) header;
+	swp = (ULONG *) header;
+	for (i = 0; i < UPKG_HDR_SIZE/4; i++, p += 4) {
+		swp[i] = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
+	}
+
+	hdr = (struct upkg_hdr *) header;
+	if (hdr->tag != UPKG_HDR_TAG) {
+		return -1;
+	}
+	if (hdr->name_count	< 0	||
+	    hdr->name_offset	< 0	||
+	    hdr->export_count	< 0	||
+	    hdr->export_offset	< 0	||
+	    hdr->import_count	< 0	||
+	    hdr->import_offset	< 0	) {
+		return -1;
+	}
+
+	switch (hdr->file_version) {
+	case 35: case 37:	/* Unreal beta - */
+	case 40: case 41:				/* 1998 */
+	case 61:/* Unreal */
+	case 62:/* Unreal Tournament */
+	case 63:/* Return to NaPali */
+	case 64:/* Unreal Tournament */
+	case 66:/* Unreal Tournament */
+	case 68:/* Unreal Tournament */
+	case 69:/* Tactical Ops */
+	case 83:/* Mobile Forces */
+		return 0;
+	}
+
+	return -1;
+}
+
+static int process_upkg (SLONG *ofs, SLONG *objsize)
+{
+	char header[UPKG_HDR_SIZE];
+
+	if (!_mm_read_UBYTES(header, UPKG_HDR_SIZE, modreader))
+		return -1;
+	if (probe_header(header) < 0)
+		return -1;
+
+	return probe_umx((struct upkg_hdr *)header, ofs, objsize);
+}
+
+/*========== Loader vars */
+
+typedef struct _umx_info {
+	int	type;
+	SLONG	ofs, size;
+	MLOADER* loader;
+} umx_info;
+
+static umx_info *umx_data = NULL;
+
+/*========== Loader code */
+
+/* Without Test() being called first, Load[Title] is never called.
+ * A Test() is always followed by either a Load() or a LoadTitle().
+ * A Load() is always followed by Cleanup() regardless of success.
+ *
+ * Therefore, in between Test() and LoadTitle() or Load()/Cleanup(),
+ * we must remember the type and the offset of the umx music data,
+ * and always clear it when returning from LoadTitle() or Cleanup().
+ */
+
+static int UMX_Test(void)
+{
+	int type;
+	SLONG ofs = 0, size = 0;
+
+	if (umx_data) {
+#ifdef MIKMOD_DEBUG
+		fprintf(stderr, "UMX_Test called while a previous instance is active\n");
+#endif
+		MikMod_free(umx_data);
+		umx_data = NULL;
+	}
+
+	_mm_fseek(modreader, 0, SEEK_SET);
+	type = process_upkg(&ofs, &size);
+	if (type < 0 || type > UMUSIC_MOD)
+		return 0;
+
+	umx_data = (umx_info*) MikMod_calloc(1, sizeof(umx_info));
+	if (!umx_data) return 0;
+
+	umx_data->type = type;
+	umx_data->ofs = ofs;
+	umx_data->size = size;
+	switch (type) {
+	case UMUSIC_IT:
+		umx_data->loader = &load_it;
+		break;
+	case UMUSIC_S3M:
+		umx_data->loader = &load_s3m;
+		break;
+	case UMUSIC_XM:
+		umx_data->loader = &load_xm;
+		break;
+	case UMUSIC_MOD:
+		umx_data->loader = &load_mod;
+		break;
+	}
+
+	return 1;
+}
+
+static int UMX_Init(void)
+{
+	if (!umx_data || !umx_data->loader)
+		return 0;
+
+	if (umx_data->loader->Init)
+		return umx_data->loader->Init();
+
+	return 1;
+}
+
+static void UMX_Cleanup(void)
+{
+	if (!umx_data) return;
+
+	if (umx_data->loader && umx_data->loader->Cleanup)
+		umx_data->loader->Cleanup();
+
+	MikMod_free(umx_data);
+	umx_data = NULL;
+}
+
+static int UMX_Load(int curious)
+{
+	if (!umx_data || !umx_data->loader)
+		return 0;
+
+	_mm_fseek(modreader, umx_data->ofs, SEEK_SET);
+	/* set reader iobase to the umx object offset */
+	_mm_iobase_revert(modreader);
+	_mm_iobase_setcur(modreader);
+
+	return umx_data->loader->Load(curious);
+}
+
+static CHAR *UMX_LoadTitle(void)
+{
+	CHAR *title;
+
+	if (!umx_data) return NULL;
+
+	if (!umx_data->loader) {
+		title = NULL;
+	}
+	else {
+		_mm_fseek(modreader, umx_data->ofs, SEEK_SET);
+		/* set reader iobase to the umx object offset */
+		_mm_iobase_revert(modreader);
+		_mm_iobase_setcur(modreader);
+
+		title = umx_data->loader->LoadTitle();
+	}
+
+	MikMod_free(umx_data);
+	umx_data = NULL;
+
+	return title;
+}
+
+/*========== Loader information */
+
+MIKMODAPI MLOADER load_umx = {
+	NULL,
+	"UMX",
+	"UMX (Unreal UMX container)",
+	UMX_Init,
+	UMX_Test,
+	UMX_Load,
+	UMX_Cleanup,
+	UMX_LoadTitle
+};
+
+/* ex:set ts=8: */