45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#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;
|
|
};
|
|
|
|
} |