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https://github.com/vgmstream/vgmstream.git
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125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
#ifndef _MZRT_STREAMFILE_H_
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#define _MZRT_STREAMFILE_H_
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#include "../streamfile.h"
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typedef struct {
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/* config */
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off_t stream_offset;
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size_t stream_size;
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/* state */
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off_t logical_offset; /* fake offset */
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off_t physical_offset; /* actual offset */
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size_t block_size; /* current size */
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size_t skip_size; /* size from block start to reach data */
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size_t data_size; /* usable size in a block */
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size_t logical_size;
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} mzrt_io_data;
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static size_t mzrt_io_read(STREAMFILE *streamfile, uint8_t *dest, off_t offset, size_t length, mzrt_io_data* data) {
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size_t total_read = 0;
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/* re-start when previous offset (can't map logical<>physical offsets) */
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if (data->logical_offset < 0 || offset < data->logical_offset) {
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data->physical_offset = data->stream_offset;
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data->logical_offset = 0x00;
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data->data_size = 0;
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}
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/* read blocks */
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while (length > 0) {
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/* ignore EOF */
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if (offset < 0 || data->physical_offset >= data->stream_offset + data->stream_size) {
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break;
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}
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/* process new block */
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if (data->data_size == 0) {
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/* 0x00: samples in this block */
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data->data_size = read_32bitBE(data->stream_offset + 0x04, streamfile);
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data->skip_size = 0x08;
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data->block_size = data->skip_size + data->data_size;
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}
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/* move to next block */
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if (data->data_size == 0 || offset >= data->logical_offset + data->data_size) {
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data->physical_offset += data->block_size;
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data->logical_offset += data->data_size;
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data->data_size = 0;
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continue;
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}
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/* read data */
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{
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size_t bytes_consumed, bytes_done, to_read;
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bytes_consumed = offset - data->logical_offset;
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to_read = data->data_size - bytes_consumed;
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if (to_read > length)
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to_read = length;
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bytes_done = read_streamfile(dest, data->physical_offset + data->skip_size + bytes_consumed, to_read, streamfile);
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total_read += bytes_done;
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dest += bytes_done;
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offset += bytes_done;
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length -= bytes_done;
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if (bytes_done != to_read || bytes_done == 0) {
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break; /* error/EOF */
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}
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}
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}
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return total_read;
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}
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static size_t mzrt_io_size(STREAMFILE *streamfile, mzrt_io_data* data) {
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uint8_t buf[1];
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if (data->logical_size)
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return data->logical_size;
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/* force a fake read at max offset, to get max logical_offset (will be reset next read) */
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mzrt_io_read(streamfile, buf, 0x7FFFFFFF, 1, data);
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data->logical_size = data->logical_offset;
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return data->logical_size;
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}
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/* Handles deinterleaving of MZRT blocked streams */
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static STREAMFILE* setup_mzrt_streamfile(STREAMFILE *streamFile, off_t stream_offset) {
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STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
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mzrt_io_data io_data = {0};
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size_t io_data_size = sizeof(mzrt_io_data);
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io_data.stream_offset = stream_offset;
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io_data.stream_size = get_streamfile_size(streamFile) - stream_offset;
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io_data.logical_offset = -1; /* force phys offset reset */
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/* setup subfile */
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new_streamFile = open_wrap_streamfile(streamFile);
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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new_streamFile = open_io_streamfile(new_streamFile, &io_data,io_data_size, mzrt_io_read,mzrt_io_size);
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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new_streamFile = open_buffer_streamfile(new_streamFile,0);
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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return temp_streamFile;
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fail:
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close_streamfile(temp_streamFile);
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return NULL;
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}
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#endif /* _MZRT_STREAMFILE_H_ */
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