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