Add .ifs with bgm subsongs [drummania (AC), GITADORA (AC)]

src/formats.c

@@ -221,6 +221,7 @@ static const char* extension_list[] = {
     "idwav",
     "idx",
     "idxma",
+    "ifs",
     "ikm",
     "ild",
     "ilv", //txth/reserved [Star Wars Episode III (PS2)]

src/libvgmstream.vcproj

@@ -1282,10 +1282,14 @@
 					RelativePath=".\meta\ps2_iab.c"
 					>
 				</File>
-				<File
-					RelativePath=".\meta\ikm.c"
-					>
-				</File>
+                <File
+                    RelativePath=".\meta\ifs.c"
+                    >
+                </File>
+                <File
+                    RelativePath=".\meta\ikm.c"
+                    >
+                </File>
 				<File
 					RelativePath=".\meta\ps2_ild.c"
 					>

src/libvgmstream.vcxproj

@@ -441,6 +441,7 @@
     <ClCompile Include="meta\ps2_gbts.c" />
     <ClCompile Include="meta\ps2_gcm.c" />
     <ClCompile Include="meta\ps2_hgc1.c" />
+    <ClCompile Include="meta\ifs.c" />
     <ClCompile Include="meta\ikm.c" />
     <ClCompile Include="meta\ps2_ild.c" />
     <ClCompile Include="meta\raw_int.c" />

src/libvgmstream.vcxproj.filters

@@ -826,6 +826,9 @@
     <ClCompile Include="meta\ps2_hgc1.c">
       <Filter>meta\Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="meta\ifs.c">
+      <Filter>meta\Source Files</Filter>
+    </ClCompile>
     <ClCompile Include="meta\ikm.c">
       <Filter>meta\Source Files</Filter>
     </ClCompile>

src/meta/ifs.c

@@ -0,0 +1,67 @@
+#include "meta.h"
+#include "../coding/coding.h"
+
+
+/* .ifs - Konami arcade games container [drummania (AC), GITADORA (AC)] */
+VGMSTREAM* init_vgmstream_ifs(STREAMFILE* sf) {
+    VGMSTREAM* vgmstream = NULL;
+    STREAMFILE* temp_sf = NULL;
+    off_t subfile_offset, subfile_size;
+    int total_subsongs, target_subsong = sf->stream_index;
+
+
+    /* checks */
+    if (!check_extensions(sf, "ifs"))
+        goto fail;
+
+    if (read_u32be(0x00,sf) != 0x6CAD8F89)
+        goto fail;
+    if (read_u16be(0x04,sf) != 0x0003)
+        goto fail;
+
+    /* .ifs format is a binary XML thing with types/fields/nodes/etc, that sometimes
+     * contains Konami's BMP as subsongs (may differ in num_samples). This is an
+     * abridged version of the whole thing, see:
+     * - https://github.com/mon/ifstools
+     * - https://github.com/mon/kbinxml
+     * - https://bitbucket.org/ahigerd/gitadora2wav/
+     */
+
+    {
+        off_t offset, size, subfile_start;
+
+        subfile_start = read_u32be(0x10,sf);
+
+        /* skip root section and point to childs */
+        offset = 0x28 + 0x04 + read_u32be(0x28,sf);
+        size = read_u32be(offset + 0x00,sf);
+        offset += 0x04;
+
+        /* point to subfile offsets */
+        size   = size - 0x04 - read_u32be(offset + 0x00,sf) - 0x04;
+        offset = offset + 0x04 + read_u32be(offset + 0x00,sf) + 0x04;
+
+        total_subsongs = size / 0x0c;
+        if (target_subsong == 0) target_subsong = 1;
+        if (target_subsong < 0 || target_subsong > total_subsongs || total_subsongs < 1) goto fail;
+
+        subfile_offset = read_u32be(offset + (target_subsong-1)*0x0c + 0x00,sf) + subfile_start;
+        subfile_size   = read_u32be(offset + (target_subsong-1)*0x0c + 0x04,sf);
+    }
+
+    temp_sf = setup_subfile_streamfile(sf, subfile_offset, subfile_size, "bin");
+    if (!temp_sf) goto fail;
+
+    vgmstream = init_vgmstream_bmp_konami(temp_sf);
+    if (!vgmstream) goto fail;
+
+    vgmstream->num_streams = total_subsongs;
+    /* subsongs have names but are packed in six-bit strings */
+
+    close_streamfile(temp_sf);
+    return vgmstream;
+fail:
+    close_streamfile(temp_sf);
+    close_vgmstream(vgmstream);
+    return NULL;
+}

src/meta/meta.h

@@ -932,4 +932,6 @@ VGMSTREAM* init_vgmstream_cpk_memory(STREAMFILE* sf, STREAMFILE* sf_acb);
 
 VGMSTREAM *init_vgmstream_sbk(STREAMFILE *sf);
 
+VGMSTREAM* init_vgmstream_ifs(STREAMFILE* sf);
+
 #endif /*_META_H*/

src/vgmstream.c

@@ -515,6 +515,7 @@ VGMSTREAM* (*init_vgmstream_functions[])(STREAMFILE* sf) = {
     init_vgmstream_sbk,
     init_vgmstream_dsp_wiiadpcm,
     init_vgmstream_dsp_cwac,
+    init_vgmstream_ifs,
 
     /* lowest priority metas (should go after all metas, and TXTH should go before raw formats) */
     init_vgmstream_txth,            /* proper parsers should supersede TXTH, once added */