45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
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#pragma once
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#include <bfc/platform/types.h>
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#include <stdio.h>
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#include "read.h" // for the error codes
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namespace nsavi
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{
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// return codes from avi_reader functions
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enum
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{
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READ_OK = 0,
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READ_EOF = 1,
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READ_FAILED = 2,
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READ_INVALID_DATA = 3, // read was successful but data didn't make any sense
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READ_INVALID_CALL = 4, // wrong time to call this function
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READ_NOT_FOUND = 5, // requested item doesn't exist in the file
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READ_OUT_OF_MEMORY = 6, // some malloc failed and so we're aborting
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READ_DISCONNECT = 7,
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};
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class avi_reader
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{
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public:
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virtual int Read(void *buffer, uint32_t read_length, uint32_t *bytes_read)=0;
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// TODO: need to put an upper bound on Peek buffer sizes
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virtual int Peek(void *buffer, uint32_t read_length, uint32_t *bytes_read)=0;
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// in_avi will call this before descending into certain chunks that will be read entirely (e.g. avih)
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// you aren't required to do anything in response
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virtual void OverlappedHint(uint32_t read_length){}
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virtual int Seek(uint64_t position)=0;
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virtual uint64_t Tell()=0;
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// skip ahead a certain number of bytes. equivalent to fseek(..., SEEK_CUR)
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virtual int Skip(uint32_t skip_bytes)=0;
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virtual uint64_t GetContentLength()=0;
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virtual void GetFilename(wchar_t *fn, size_t len)=0;
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};
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}
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