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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     

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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    

// for more details.                                                        

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//

// 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,       

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// on this file might be covered by the GNU General Public License.         

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//==========================================================================

//#####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