2012-01-31 01:40:22 +00:00
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/*
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Copyright (C) 2005, 2006, 2008, 2011 Rocky Bernstein <rocky@gnu.org>
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Copyright (C) 2000, 2004, 2005 Herbert Valerio Riedel <hvr@gnu.org>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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# define __CDIO_CONFIG_H__ 1
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#endif
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#ifdef HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#include "cdio_assert.h"
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/* #define STREAM_DEBUG */
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#include <cdio/logging.h>
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#include <cdio/util.h>
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#include "_cdio_stream.h"
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2016-06-04 16:10:33 +00:00
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// static const char _rcsid[] = "$Id: _cdio_stream.c,v 1.9 2008/04/22 15:29:11 karl Exp $";
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2012-01-31 01:40:22 +00:00
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/*
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* DataSource implementations
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*/
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struct _CdioDataSource {
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void* user_data;
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cdio_stream_io_functions op;
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int is_open;
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off_t position;
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};
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void
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cdio_stream_close(CdioDataSource_t *p_obj)
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{
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if (!p_obj) return;
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if (p_obj->is_open) {
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cdio_debug ("closed source...");
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p_obj->op.close(p_obj->user_data);
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p_obj->is_open = 0;
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p_obj->position = 0;
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}
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}
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void
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cdio_stream_destroy(CdioDataSource_t *p_obj)
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{
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if (!p_obj) return;
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cdio_stream_close(p_obj);
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p_obj->op.free(p_obj->user_data);
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free(p_obj);
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}
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/**
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Like 3 fgetpos.
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This function gets the current file position indicator for the stream
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pointed to by stream.
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@return unpon successful completion, return value is positive, else,
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the global variable errno is set to indicate the error.
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*/
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off_t
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cdio_stream_getpos(CdioDataSource_t* p_obj, /*out*/ off_t *i_offset)
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{
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if (!p_obj || !p_obj->is_open) return DRIVER_OP_UNINIT;
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return *i_offset = p_obj->position;
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}
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CdioDataSource_t *
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cdio_stream_new(void *user_data, const cdio_stream_io_functions *funcs)
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{
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CdioDataSource_t *new_obj;
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new_obj = calloc (1, sizeof (CdioDataSource_t));
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new_obj->user_data = user_data;
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memcpy(&(new_obj->op), funcs, sizeof(cdio_stream_io_functions));
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return new_obj;
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}
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/*
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Open if not already open.
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Return false if we hit an error. Errno should be set for that error.
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*/
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static bool
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_cdio_stream_open_if_necessary(CdioDataSource_t *p_obj)
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{
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if (!p_obj) return false;
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if (!p_obj->is_open) {
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if (p_obj->op.open(p_obj->user_data)) {
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cdio_warn ("could not open input stream...");
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return false;
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} else {
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cdio_debug ("opened source...");
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p_obj->is_open = 1;
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p_obj->position = 0;
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}
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}
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return true;
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}
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/**
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Like fread(3) and in fact may be the same.
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DESCRIPTION:
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The function fread reads nmemb elements of data, each size bytes long,
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from the stream pointed to by stream, storing them at the location
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given by ptr.
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RETURN VALUE:
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return the number of items successfully read or written (i.e.,
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not the number of characters). If an error occurs, or the
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end-of-file is reached, the return value is a short item count
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(or zero).
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We do not distinguish between end-of-file and error, and callers
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must use feof(3) and ferror(3) to determine which occurred.
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*/
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ssize_t
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cdio_stream_read(CdioDataSource_t* p_obj, void *ptr, size_t size, size_t nmemb)
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{
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long read_bytes;
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if (!p_obj) return 0;
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if (!_cdio_stream_open_if_necessary(p_obj)) return 0;
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read_bytes = (p_obj->op.read)(p_obj->user_data, ptr, size*nmemb);
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p_obj->position += read_bytes;
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return read_bytes;
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}
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/**
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Like 3 fseek and in fact may be the same.
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This function sets the file position indicator for the stream
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pointed to by stream. The new position, measured in bytes, is obtained
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by adding offset bytes to the position specified by whence. If whence
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is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is relative to
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the start of the file, the current position indicator, or end-of-file,
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respectively. A successful call to the fseek function clears the end-
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of-file indicator for the stream and undoes any effects of the
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ungetc(3) function on the same stream.
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@return unpon successful completion, return value is positive, else,
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the global variable errno is set to indicate the error.
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*/
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int
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cdio_stream_seek(CdioDataSource_t* p_obj, off_t offset, int whence)
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{
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if (!p_obj) return DRIVER_OP_UNINIT;
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if (!_cdio_stream_open_if_necessary(p_obj))
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/* errno is set by _cdio_stream_open_if necessary. */
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return DRIVER_OP_ERROR;
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if (offset < 0) return DRIVER_OP_ERROR;
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if (p_obj->position < 0) return DRIVER_OP_ERROR;
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if (p_obj->position != offset) {
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#ifdef STREAM_DEBUG
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cdio_warn("had to reposition DataSource from %ld to %ld!", p_obj->position, offset);
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#endif
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p_obj->position = offset;
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return p_obj->op.seek(p_obj->user_data, offset, whence);
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}
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return 0;
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}
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/**
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Return whatever size of stream reports, I guess unit size is bytes.
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On error return -1;
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*/
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off_t
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cdio_stream_stat(CdioDataSource_t *p_obj)
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{
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if (!p_obj) return -1;
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if (!_cdio_stream_open_if_necessary(p_obj)) return -1;
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return p_obj->op.stat(p_obj->user_data);
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}
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2016-06-04 16:10:33 +00:00
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2012-01-31 01:40:22 +00:00
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/*
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* Local variables:
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* c-file-style: "gnu"
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*/
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