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