File Content Extraction 26.1
Filter SDK C Programming Guide

# KVInputStream

This structure defines an input stream for filtering. The structure is defined in `kvstream.h`.

    typedef struct tag_InputStream
    {
       void  *pInputStreamPrivateData;
       long  lcbFilesize;
       BOOL (pascal *fpOpen) (struct tag_InputStream *);
       UINT (pascal *fpRead) (struct tag_InputStream *, BYTE *, UINT);
       BOOL (pascal *fpSeek) (struct tag_InputStream *, long, int);
       long (pascal *fpTell) (struct tag_InputStream *);
       BOOL (pascal *fpClose)(struct tag_InputStream *);
    }
    KVInputStream;

## Member Descriptions

- All member functions are equivalent to their counterparts in the ANSI standard library, except `fpOpen()`, which returns `FALSE` on failure.

- If the size of the stream is known, assign that value to `lcbFilesize`. Otherwise, set `lcbFilesize` to `0`.

  When the file size is known, File Content Extraction can reduce the number of times it needs to read or seek the underlying stream. This optimization can improve performance for some file types or operations.

  NOTE: If the file size is not set to zero or the correct file size, the behavior is undefined.

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: KVInputStream