mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-14 15:42:52 +01:00
183 lines
5.2 KiB
C
183 lines
5.2 KiB
C
#include "meta.h"
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// Guitar Hero III Mobile .bar
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enum {BAR_KEY_LENGTH = 16};
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// don't know if this is unique, but seems accurate
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static const uint8_t bar_key[BAR_KEY_LENGTH] =
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{0xbd,0x14,0x0e,0x0a,0x91,0xeb,0xaa,0xf6,
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0x11,0x44,0x17,0xc2,0x1c,0xe4,0x66,0x80};
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typedef struct _BARSTREAM
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{
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STREAMFILE sf;
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STREAMFILE *real_file;
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} BARSTREAM;
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STREAMFILE *wrap_bar_STREAMFILE(STREAMFILE *file);
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VGMSTREAM * init_vgmstream_gh3_bar(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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// don't close, this is just the source streamFile wrapped
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STREAMFILE* streamFileBAR = NULL;
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char filename[PATH_LIMIT];
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off_t start_offset;
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off_t ch2_start_offset;
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int loop_flag;
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int channel_count;
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long file_size;
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/* check extension, case insensitive */
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streamFile->get_name(streamFile,filename,sizeof(filename));
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if (strcasecmp("bar",filename_extension(filename))) goto fail;
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/* decryption wrapper for header reading */
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streamFileBAR = wrap_bar_STREAMFILE(streamFile);
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if (!streamFileBAR) goto fail;
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file_size = get_streamfile_size(streamFileBAR);
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/* check header */
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if (read_32bitBE(0x00,streamFileBAR) != 0x11000100 ||
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read_32bitBE(0x04,streamFileBAR) != 0x01000200) goto fail;
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if (read_32bitLE(0x50,streamFileBAR) != file_size) goto fail;
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start_offset = read_32bitLE(0x18,streamFileBAR);
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if (0x54 != start_offset) goto fail;
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ch2_start_offset = read_32bitLE(0x48,streamFileBAR);
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if (ch2_start_offset >= file_size) goto fail;
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/* build the VGMSTREAM */
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channel_count = 2;
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loop_flag = 0;
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vgmstream = allocate_vgmstream(channel_count, loop_flag);
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if (!vgmstream) goto fail;
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/* fill in the vital statistics */
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = 11025;
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vgmstream->coding_type = coding_IMA;
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vgmstream->num_samples = (file_size-ch2_start_offset)*2;
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vgmstream->layout_type = layout_none;
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vgmstream->meta_type = meta_GH3_BAR;
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{
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STREAMFILE *file1, *file2;
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file1 = streamFileBAR->open(streamFileBAR,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!file1) goto fail;
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file2 = streamFileBAR->open(streamFileBAR,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!file2)
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{
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close_streamfile(file1);
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goto fail;
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}
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vgmstream->ch[0].streamfile = file1;
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vgmstream->ch[1].streamfile = file2;
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vgmstream->ch[0].channel_start_offset=
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vgmstream->ch[0].offset=start_offset;
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vgmstream->ch[1].channel_start_offset=
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vgmstream->ch[1].offset=ch2_start_offset;
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}
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// discard our decrypt wrapper, without closing the original streamfile
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free(streamFileBAR);
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return vgmstream;
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fail:
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if (streamFileBAR)
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free(streamFileBAR);
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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static size_t read_bar(BARSTREAM *streamFile, uint8_t *dest, off_t offset, size_t length)
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{
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off_t i;
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size_t read_length =
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streamFile->real_file->read(streamFile->real_file, dest, offset, length);
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for (i = 0; i < read_length; i++)
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{
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dest[i] = dest[i] ^ bar_key[(i+offset)%BAR_KEY_LENGTH];
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}
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return read_length;
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}
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static size_t get_size_bar(BARSTREAM *streamFile)
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{
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return streamFile->real_file->get_size(streamFile->real_file);
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}
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static size_t get_offset_bar(BARSTREAM *streamFile)
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{
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return streamFile->real_file->get_offset(streamFile->real_file);
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}
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static void get_name_bar(BARSTREAM *streamFile, char *name, size_t length)
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{
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return streamFile->real_file->get_name(streamFile->real_file, name, length);
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}
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static void get_realname_bar(BARSTREAM *streamFile, char *name, size_t length)
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{
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return streamFile->real_file->get_realname(streamFile->real_file, name, length);
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}
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STREAMFILE *open_bar(BARSTREAM *streamFile, const char * const filename, size_t buffersize)
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{
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STREAMFILE *newfile = streamFile->real_file->open(
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streamFile->real_file,filename,buffersize);
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if (!newfile)
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return NULL;
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return wrap_bar_STREAMFILE(newfile);
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}
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static void close_bar(BARSTREAM *streamFile)
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{
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streamFile->real_file->close(streamFile->real_file);
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free(streamFile);
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return;
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}
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#ifdef PROFILE_STREAMFILE
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size_t get_bytes_read_bar(BARSTREAM *streamFile)
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{
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return streamFile->real_file->get_bytes_read(streamFile->real_file);
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}
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int (*get_error_count)(BARSTREAM *streamFile)
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{
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return streamFile->real_file->get_error_count(streamFile->real_file);
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}
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#endif
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STREAMFILE *wrap_bar_STREAMFILE(STREAMFILE *file)
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{
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BARSTREAM *streamfile = malloc(sizeof(BARSTREAM));
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if (!streamfile)
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return NULL;
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memset(streamfile, 0, sizeof(BARSTREAM));
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streamfile->sf.read = (void*)read_bar;
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streamfile->sf.get_size = (void*)get_size_bar;
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streamfile->sf.get_offset = (void*)get_offset_bar;
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streamfile->sf.get_name = (void*)get_name_bar;
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streamfile->sf.get_realname = (void*)get_realname_bar;
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streamfile->sf.open = (void*)open_bar;
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streamfile->sf.close = (void*)close_bar;
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#ifdef PROFILE_STREAMFILE
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streamfile->sf.get_bytes_read = get_bytes_read_bar;
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streamfile->sf.get_error_count = get_error_count_bar;
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#endif
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streamfile->real_file = file;
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return &streamfile->sf;
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}
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