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stream: add getpos routine

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udf: save last read position.
This commit is contained in:
rocky
2006-04-15 03:05:14 +00:00
parent 80ab1a301c
commit 22608b594e
7 changed files with 179 additions and 143 deletions
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37
lib/driver/_cdio_stream.h
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@@ -1,8 +1,9 @@
/*
$Id: _cdio_stream.h,v 1.3 2005/02/05 04:25:14 rocky Exp $
$Id: _cdio_stream.h,v 1.4 2006/04/15 03:05:14 rocky Exp $
Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
Copyright (C) 2003, 2004, 2005 Rocky Bernstein <rocky@panix.com>
Copyright (C) 2003, 2004, 2005, 2006 Rocky Bernstein
<rocky@cpan.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -57,10 +58,22 @@ extern "C" {
cdio_data_free_t free;
} cdio_stream_io_functions;
/**
Like 3 fgetpos.
This function gets the current file position indicator for the stream
pointed to by stream.
@return unpon successful completion, return value is positive, else,
the global variable errno is set to indicate the error.
*/
ssize_t cdio_stream_getpos(CdioDataSource_t* p_obj,
/*out*/ ssize_t *i_offset);
CdioDataSource_t *
cdio_stream_new(void *user_data, const cdio_stream_io_functions *funcs);
/*!
/**
Like fread(3) and in fact may be the same.
DESCRIPTION:
@@ -77,10 +90,10 @@ extern "C" {
We do not distinguish between end-of-file and error, and callers
must use feof(3) and ferror(3) to determine which occurred.
*/
long cdio_stream_read(CdioDataSource_t* p_obj, void *ptr, long i_size,
long nmemb);
ssize_t cdio_stream_read(CdioDataSource_t* p_obj, void *ptr, long i_size,
long nmemb);
/*!
/**
Like fseek(3) and in fact may be the same.
This function sets the file position indicator for the stream
@@ -96,17 +109,17 @@ extern "C" {
DRIVER_OP_ERROR is returned and the global variable errno is set to
indicate the error.
*/
driver_return_code_t cdio_stream_seek(CdioDataSource_t *p_obj, long offset,
int whence);
ssize_t cdio_stream_seek(CdioDataSource_t *p_obj, ssize_t i_offset,
int whence);
/*!
/**
Return whatever size of stream reports, I guess unit size is bytes.
On error return -1;
*/
long int cdio_stream_stat(CdioDataSource_t *p_obj);
ssize_t cdio_stream_stat(CdioDataSource_t *p_obj);
/*!
Deallocate resources assocaited with p_obj. After this p_obj is unusable.
/**
Deallocate resources associated with p_obj. After this p_obj is unusable.
*/
void cdio_stream_destroy(CdioDataSource_t *p_obj);