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https://github.com/vgmstream/vgmstream.git
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103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
#ifndef _MUPS_STREAMFILE_H_
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#define _MUPS_STREAMFILE_H_
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#include "deblock_streamfile.h"
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static inline int32_t max32(int32_t val1, int32_t val2) {
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if (val1 > val2)
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return val2;
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return val1;
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}
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static void read_callback(uint8_t* dst, deblock_io_data* data, size_t block_pos, size_t read_size) {
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static const uint8_t oggs[] = { 0x4F, 0x67, 0x67, 0x53 };
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static const uint8_t vorbis[] = { 0x76, 0x6F, 0x72, 0x62, 0x69, 0x73 };
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int i, min, max;
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/* Swaps Xiph magic words back (resulting page checksum is ok).
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* Reads can start/end anywhere, but block_pos = 0 is always page start */
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/* change "PssH" back to "OggS" */
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if (block_pos < 0x04) {
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min = block_pos;
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if (min < 0x00)
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min = 0x00;
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max = block_pos + read_size;
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if (max > 0x04)
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max = 0x04;
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for (i = min; i < max; i++) {
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dst[i] = oggs[i - 0x00];
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}
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}
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/* first page also needs "psolar" to "vorbis" */
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if (data->logical_offset == 0 && block_pos < 0x23) {
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min = block_pos;
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if (min < 0x1d)
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min = 0x1d;
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max = block_pos + read_size;
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if (max > 0x23)
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max = 0x23;
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for (i = min; i < max; i++) {
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dst[i] = vorbis[i - 0x1d];
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}
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}
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}
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static int get_page_size(STREAMFILE* sf, off_t page_offset) {
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static const int base_size = 0x1b;
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uint8_t page[0x1b + 0x100];
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uint8_t segments;
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size_t page_size;
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int i, bytes;
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bytes = read_streamfile(page + 0x00, page_offset + 0x00, base_size, sf);
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if (bytes != base_size) goto fail;
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if (get_u32be(page + 0x00) != 0x50737348) /* "PssH" */
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goto fail;
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segments = get_u8(page + 0x1a);
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bytes = read_streamfile(page + base_size, page_offset + base_size, segments, sf);
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if (bytes != segments) goto fail;
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page_size = base_size + segments;
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for (i = 0; i < segments; i++) {
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uint8_t segment_size = get_u8(page + base_size + i);
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page_size += segment_size;
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}
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return page_size;
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fail:
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return -1; /* not a valid page */
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}
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static void block_callback(STREAMFILE* sf, deblock_io_data* data) {
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off_t page_offset = data->physical_offset;
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/* block size = OggS page size as we need read_callback called on page starts */
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data->data_size = get_page_size(sf, page_offset);
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data->block_size = data->data_size;
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}
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/* Fixes MUPS streams that contain mutated OggS */
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static STREAMFILE* setup_mups_streamfile(STREAMFILE* sf, off_t stream_offset) {
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STREAMFILE* new_sf = NULL;
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deblock_config_t cfg = {0};
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cfg.stream_start = stream_offset;
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cfg.block_callback = block_callback;
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cfg.read_callback = read_callback;
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new_sf = open_wrap_streamfile(sf);
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new_sf = open_io_deblock_streamfile_f(new_sf, &cfg);
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new_sf = open_fakename_streamfile_f(new_sf, NULL, "ogg");
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return new_sf;
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}
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#endif /* _MUPS_STREAMFILE_H_ */
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