61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/*
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ogg_filestream.c - helper struct for working with Ogg files
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Copyright (C) 2024 SNMetamorph
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include "ogg_filestream.h"
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#include "soundlib.h"
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#include <string.h>
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size_t OggFilestream_Read( void *ptr, size_t blockSize, size_t nmemb, void *datasource )
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{
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ogg_filestream_t *filestream = (ogg_filestream_t*)datasource;
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size_t remain = filestream->filesize - filestream->position;
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size_t dataSize = blockSize * nmemb;
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// reads as many blocks as fits in remaining memory
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if( dataSize > remain )
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dataSize = remain - remain % blockSize;
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memcpy( ptr, filestream->buffer + filestream->position, dataSize );
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filestream->position += dataSize;
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return dataSize / blockSize;
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}
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int OggFilestream_Seek( void *datasource, int64_t offset, int whence )
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{
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int64_t position;
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ogg_filestream_t *filestream = (ogg_filestream_t*)datasource;
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if( whence == SEEK_SET )
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position = offset;
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else if( whence == SEEK_CUR )
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position = offset + filestream->position;
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else if( whence == SEEK_END )
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position = offset + filestream->filesize;
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else
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return -1;
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if( position < 0 || position > filestream->filesize )
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return -1;
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filestream->position = position;
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return 0;
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}
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long OggFilestream_Tell( void *datasource )
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{
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ogg_filestream_t *filestream = (ogg_filestream_t*)datasource;
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return filestream->position;
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}
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