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|
//==========================================================================
//
// lib/tftp_dummy_file.c
//
// Dummy [in memory] file I/O functions
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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 or (at your option) any later
// version.
//
// eCos 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.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 2000-04-06
// Purpose:
// Description:
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
// TFTP file support - minimal "dummy" version
#include <network.h>
#include <tftp_support.h>
static int dummy_open(const char *, int);
static int dummy_close(int);
static int dummy_write(int, const void *, int);
static int dummy_read(int, void *, int);
struct tftpd_fileops dummy_fileops = {
dummy_open, dummy_close, dummy_write, dummy_read
};
struct _file_info;
struct _file {
unsigned char *pos, *eof;
int flags;
int mode;
struct _file_info *file;
};
#define FILE_OPEN 0x0001
#define NUM_FILES 8
static struct _file files[NUM_FILES];
struct _file_info {
char *name;
unsigned char *data;
int length, size;
};
// TEMP
static unsigned char _uu_data[] = "This is a test\n\
Four score and seven years ago,\n\
our forefathers brought forth a new nation,\n\
conceived in liberty and dedicated to the\n\
proposition that all men are created equal.\n\
Now we are engaged in a great civil war, testing\n\
whether that nation, or any nation so conceived\n\
and so dedicated, can long endure.\n\
1111111111111111111111111111111111\n\
2222222222222222222222222222222222\n\
3333333333333333333333333333333333\n\
4444444444444444444444444444444444\n\
5555555555555555555555555555555555\n\
6666666666666666666666666666666666\n\
";
static unsigned char _f0_data[1024*1024];
static unsigned char _f1_data[1024*1024];
static unsigned char _f2_data[1024*1024];
static char _name0[256] = "", _name1[256] = "", _name2[256] = "";
static struct _file_info file_list[] = {
{ "uu", _uu_data, sizeof(_uu_data)-1, sizeof(_uu_data)-1},
{ _name0, _f0_data, 0, sizeof(_f0_data)}, // Empty file
{ _name1, _f1_data, 0, sizeof(_f1_data)}, // Empty file
{ _name2, _f2_data, 0, sizeof(_f2_data)}, // Empty file
{ 0, 0, 0} // End of list
};
static inline struct _file *
dummy_fp(int fd)
{
struct _file *fp;
if ((fd < 0) || (fd >= NUM_FILES)) return (struct _file *)0;
fp = &files[fd];
if (!(fp->flags & FILE_OPEN)) return (struct _file *)0;
return fp;
}
static int
dummy_open(const char *fn, int flags)
{
int res = -1;
int fd;
struct _file *fp;
struct _file_info *fi;
fp = files;
for (fd = 0; fd < NUM_FILES; fd++, fp++) {
if (!(fp->flags & FILE_OPEN)) break;
}
if (fd == NUM_FILES) {
return -1; // No free files
}
if (flags & O_RDONLY) {
// Search for an extant file
fi = file_list;
while (fi->name) {
if (strcmp(fi->name, fn) == 0) {
// Found it!
fp->pos = fi->data;
fp->eof = fi->data + fi->length;
fp->flags = FILE_OPEN;
fp->mode = flags;
return fd;
}
fi++;
}
} else {
// Search for a non-existant file
fi = file_list;
while (fi->name) {
if (fi->name[0] == '\0' || strcmp(fi->name, fn) == 0) {
if ( !fi->name[0] )
// Empty slot found
strcpy(fi->name, fn);
fp->pos = fi->data;
fp->eof = fi->data + fi->size;
fp->file = fi; // So we can update file info later
fp->mode = flags;
fp->flags = FILE_OPEN;
return fd;
}
fi++;
}
}
// No such file
return res;
}
static int
dummy_close(int fd)
{
struct _file *fp = dummy_fp(fd);
if (!fp) return -1;
if (fp->mode & O_WRONLY) {
// Clean up - update file info for later
fp->file->length = fp->pos - fp->file->data;
}
fp->flags = 0; // No longer open
return 0;
}
static int
dummy_write(int fd, const void *buf, int len)
{
struct _file *fp = dummy_fp(fd);
int res;
if (!fp) return -1;
res = fp->eof - fp->pos; // Space left in file
if (res <= 0) return 0; // End of file
if (res > len) res = len;
bcopy(buf, fp->pos, res);
fp->pos += res;
return res;
}
static int
dummy_read(int fd, void *buf, int len)
{
struct _file *fp = dummy_fp(fd);
int res;
if (!fp) return -1;
res = fp->eof - fp->pos; // Number of bytes left in "file"
if (res > len) res = len;
if (res <= 0) return 0; // End of file
bcopy(fp->pos, buf, res);
fp->pos += res;
return res;
}
// EOF tftp_dummy_file.c
|
