/usr/lib/grass72/include/grass/iostream/mem_stream.h is in grass-dev 7.2.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* MODULE: iostream
*
* COPYRIGHT (C) 2007 Laura Toma
*
*
* Iostream is a library that implements streams, external memory
* sorting on streams, and an external memory priority queue on
* streams. These are the fundamental components used in external
* memory algorithms.
* Credits: The library was developed by Laura Toma. The kernel of
* class STREAM is based on the similar class existent in the GPL TPIE
* project developed at Duke University. The sorting and priority
* queue have been developed by Laura Toma based on communications
* with Rajiv Wickremesinghe. The library was developed as part of
* porting Terraflow to GRASS in 2001. PEARL upgrades in 2003 by
* Rajiv Wickremesinghe as part of the Terracost project.
*
* 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
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details. *
* **************************************************************************/
#ifndef _MEM_STREAM_H
#define _MEM_STREAM_H
#include <stdlib.h>
#include <assert.h>
#include <cstring>
#include <iostream>
template<class T>
class MEM_STREAM {
private:
T *data;
T *curr;
T *dataend;
int len;
public:
MEM_STREAM(T *data, int len);
~MEM_STREAM(void);
// Read and write elements.
AMI_err read_item(T **elt);
AMI_err write_item(const T &elt);
// Return the number of items in the stream.
off_t stream_len(void);
// Return the path name of this stream.
AMI_err name(char **stream_name);
// Move to a specific item in the stream.
AMI_err seek(off_t offset);
char *sprint();
};
/**********************************************************************/
template<class T>
MEM_STREAM<T>::MEM_STREAM(T *datap, int lenv) {
data = datap;
dataend = data + lenv;
curr = datap;
len = lenv;
};
/**********************************************************************/
// Return the number of items in the stream.
template<class T>
off_t MEM_STREAM<T>::stream_len(void) {
return len;
};
/**********************************************************************/
// Return the path name of this stream.
template<class T>
AMI_err MEM_STREAM<T>::name(char **stream_name) {
const char *path = "dummy";
*stream_name = new char [strlen(path) + 1];
strcpy(*stream_name, path);
return AMI_ERROR_NO_ERROR;
};
/**********************************************************************/
// Move to a specific offset within the (sub)stream.
template<class T>
AMI_err MEM_STREAM<T>::seek(off_t offset) {
assert(offset <= len);
curr = data + offset;
return AMI_ERROR_NO_ERROR;
}
/**********************************************************************/
template<class T>
MEM_STREAM<T>::~MEM_STREAM(void) {
};
/**********************************************************************/
template<class T>
AMI_err MEM_STREAM<T>::read_item(T **elt) {
assert(data);
if(curr == dataend) {
return AMI_ERROR_END_OF_STREAM;
}
*elt = curr;
curr++;
return AMI_ERROR_NO_ERROR;
};
/**********************************************************************/
template<class T>
AMI_err MEM_STREAM<T>::write_item(const T &elt) {
assert(data);
if(curr == dataend) {
return AMI_ERROR_END_OF_STREAM;
}
*curr = elt;
curr++;
return AMI_ERROR_NO_ERROR;
};
/**********************************************************************/
// sprint()
// Return a string describing the stream
//
// This function gives easy access to the file name, length.
// It is not reentrant, but this should not be too much of a problem
// if you are careful.
template<class T>
char *MEM_STREAM<T>::sprint() {
static char buf[BUFSIZ];
sprintf(buf, "[MEM_STREAM %d]", stream_len());
return buf;
};
#endif // _MEM_STREAM_H
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