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Clean .bgw

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This commit is contained in:
bnnm 2019-09-02 20:57:17 +02:00
parent 5140cabe2d
commit 087e22dad2
5 changed files with 75 additions and 61 deletions
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4
src/libvgmstream.vcproj
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@ -252,6 +252,10 @@
RelativePath=".\meta\bar_streamfile.h"
>
</File>
<File
RelativePath=".\meta\bgw_streamfile.h"
>
</File>
<File
RelativePath=".\meta\ea_eaac_streamfile.h"
>

1
src/libvgmstream.vcxproj
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@ -106,6 +106,7 @@
<ClInclude Include="meta\aix_streamfile.h" />
<ClInclude Include="meta\awc_xma_streamfile.h" />
<ClInclude Include="meta\bar_streamfile.h" />
<ClInclude Include="meta\bgw_streamfile.h" />
<ClInclude Include="meta\ea_eaac_streamfile.h" />
<ClInclude Include="meta\ea_schl_streamfile.h" />
<ClInclude Include="meta\fsb_interleave_streamfile.h" />

3
src/libvgmstream.vcxproj.filters
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@ -86,6 +86,9 @@
<ClInclude Include="meta\bar_streamfile.h">
<Filter>meta\Header Files</Filter>
</ClInclude>
<ClInclude Include="meta\bgw_streamfile.h">
<Filter>meta\Header Files</Filter>
</ClInclude>
<ClInclude Include="meta\ea_eaac_streamfile.h">
<Filter>meta\Header Files</Filter>
</ClInclude>

62
src/meta/bgw.c
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@ -1,8 +1,6 @@
#include "meta.h"
#include "../coding/coding.h"
static STREAMFILE* setup_bgw_atrac3_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, size_t frame_size, int channels);
#include "bgw_streamfile.h"
/* BGW - from Final Fantasy XI (PC) music files */
@ -220,61 +218,3 @@ fail:
close_vgmstream(vgmstream);
return NULL;
}
#define BGW_KEY_MAX (0xC0*2)
typedef struct {
uint8_t key[BGW_KEY_MAX];
size_t key_size;
} bgw_decryption_data;
/* Encrypted ATRAC3 info from Moogle Toolbox (https://sourceforge.net/projects/mogbox/) */
static size_t bgw_decryption_read(STREAMFILE *streamfile, uint8_t *dest, off_t offset, size_t length, bgw_decryption_data* data) {
size_t bytes_read;
int i;
bytes_read = streamfile->read(streamfile, dest, offset, length);
/* decrypt data (xor) */
for (i = 0; i < bytes_read; i++) {
dest[i] ^= data->key[(offset + i) % data->key_size];
}
return bytes_read;
}
static STREAMFILE* setup_bgw_atrac3_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, size_t frame_size, int channels) {
STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
bgw_decryption_data io_data = {0};
size_t io_data_size = sizeof(bgw_decryption_data);
int ch;
/* setup decryption with key (first frame + modified channel header) */
if (frame_size*channels == 0 || frame_size*channels > BGW_KEY_MAX) goto fail;
io_data.key_size = read_streamfile(io_data.key, subfile_offset, frame_size*channels, streamFile);
for (ch = 0; ch < channels; ch++) {
uint32_t xor = get_32bitBE(io_data.key + frame_size*ch);
put_32bitBE(io_data.key + frame_size*ch, xor ^ 0xA0024E9F);
}
/* setup subfile */
new_streamFile = open_wrap_streamfile(streamFile);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_io_streamfile(temp_streamFile, &io_data,io_data_size, bgw_decryption_read,NULL);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
return temp_streamFile;
fail:
close_streamfile(temp_streamFile);
return NULL;
}

66
src/meta/bgw_streamfile.h Normal file
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@ -0,0 +1,66 @@
#ifndef _BGW_STREAMFILE_H_
#define _BGW_STREAMFILE_H_
#include "../streamfile.h"
#define BGW_KEY_MAX (0xC0*2)
typedef struct {
uint8_t key[BGW_KEY_MAX];
size_t key_size;
} bgw_decryption_data;
/* Encrypted ATRAC3 info from Moogle Toolbox (https://sourceforge.net/projects/mogbox/) */
static size_t bgw_decryption_read(STREAMFILE *streamfile, uint8_t *dest, off_t offset, size_t length, bgw_decryption_data* data) {
size_t bytes_read;
int i;
bytes_read = streamfile->read(streamfile, dest, offset, length);
/* decrypt data (xor) */
for (i = 0; i < bytes_read; i++) {
dest[i] ^= data->key[(offset + i) % data->key_size];
}
//todo: a few files (music069.bgw, music071.bgw, music900.bgw) have the last frames unencrypted,
// though they are blank and encoder ignores wrongly decrypted frames and outputs blank samples as well
return bytes_read;
}
static STREAMFILE* setup_bgw_atrac3_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, size_t frame_size, int channels) {
STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
bgw_decryption_data io_data = {0};
size_t io_data_size = sizeof(bgw_decryption_data);
int ch;
/* setup decryption with key (first frame + modified channel header) */
if (frame_size*channels == 0 || frame_size*channels > BGW_KEY_MAX) goto fail;
io_data.key_size = read_streamfile(io_data.key, subfile_offset, frame_size*channels, streamFile);
for (ch = 0; ch < channels; ch++) {
uint32_t xor = get_32bitBE(io_data.key + frame_size*ch);
put_32bitBE(io_data.key + frame_size*ch, xor ^ 0xA0024E9F);
}
/* setup subfile */
new_streamFile = open_wrap_streamfile(streamFile);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_io_streamfile(temp_streamFile, &io_data,io_data_size, bgw_decryption_read,NULL);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
return temp_streamFile;
fail:
close_streamfile(temp_streamFile);
return NULL;
}
#endif /* _BGW_STREAMFILE_H_ */