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/*

 * rom.c -- Support for ROMed page retrieval.

 *

 * Copyright (c) GoAhead Software Inc., 1995-2000. All Rights Reserved.

 *

 * See the file "license.txt" for usage and redistribution license requirements

 */

/******************************** Description *********************************/

/*

 *      This module provides web page retrieval from compiled web pages. Use the

 *      webcomp program to compile web pages and link into the GoAhead WebServer.

 *      This module uses a hashed symbol table for fast page lookup.

 *

 *      Usage: webcomp -f webPageFileList -p Prefix >webrom.c

 */

/********************************* Includes ***********************************/

#include        <stdlib.h>

#include        "wsIntrn.h"

/******************************** Local Data **********************************/

#if WEBS_PAGE_ROM

sym_fd_t        romTab;                                         /* Symbol table for web pages */

/*********************************** Code *************************************/

/*

 *      Open the ROM module

 */

int websRomOpen()

{

        websRomPageIndexType    *wip;

        int                                             nchars;

        char_t                                  name[SYM_MAX];

        romTab = symOpen(WEBS_SYM_INIT);

        for (wip = websRomPageIndex; wip->path; wip++) {

                gstrncpy(name, wip->path, SYM_MAX);

                nchars = gstrlen(name) - 1;

                if (nchars > 0 &&

                        (name[nchars] == '/' || name[nchars] == '\\')) {

                        name[nchars] = '\0';

                }

                symEnter(romTab, name, valueInteger((int) wip), 0);

        }

        return 0;

}

/******************************************************************************/

/*

 *      Close the ROM module

 */

void websRomClose()

{

        symClose(romTab);

}

/******************************************************************************/

/*

 *      Open a web page

 */

int websRomPageOpen(webs_t wp, char_t *path, int mode, int perm)

{

        websRomPageIndexType    *wip;

        sym_t                                   *sp;

        a_assert(websValid(wp));

        a_assert(path && *path);

        if ((sp = symLookup(romTab, path)) == NULL) {

                return -1;

        }

        wip = (websRomPageIndexType*) sp->content.value.integer;

        wip->pos = 0;

        return (wp->docfd = wip - websRomPageIndex);

}

/******************************************************************************/

/*

 *      Close a web page

 */

void websRomPageClose(int fd)

{

}

/******************************************************************************/

/*

 *      Stat a web page

 */

int websRomPageStat(char_t *path, websStatType *sbuf)

{

        websRomPageIndexType    *wip;

        sym_t                                   *sp;

        a_assert(path && *path);

        if ((sp = symLookup(romTab, path)) == NULL) {

                return -1;

        }

        wip = (websRomPageIndexType*) sp->content.value.integer;

        memset(sbuf, 0, sizeof(websStatType));

        sbuf->size = wip->size;

        if (wip->page == NULL) {

                sbuf->isDir = 1;

        }

        return 0;

}

/******************************************************************************/

/*

 *      Read a web page

 */

int websRomPageReadData(webs_t wp, char *buf, int nBytes)

{

        websRomPageIndexType    *wip;

        int                                             len;

        a_assert(websValid(wp));

        a_assert(buf);

        a_assert(wp->docfd >= 0);

        wip = &websRomPageIndex[wp->docfd];

        len = min(wip->size - wip->pos, nBytes);

        memcpy(buf, &wip->page[wip->pos], len);

        wip->pos += len;

        return len;

}

/******************************************************************************/

/*

 *      Position a web page

 */

long websRomPageSeek(webs_t wp, long offset, int origin)

{

        websRomPageIndexType    *wip;

        long pos;

        a_assert(websValid(wp));

        a_assert(origin == SEEK_SET || origin == SEEK_CUR || origin == SEEK_END);

        a_assert(wp->docfd >= 0);

        wip = &websRomPageIndex[wp->docfd];

        if (origin != SEEK_SET && origin != SEEK_CUR && origin != SEEK_END) {

                errno = EINVAL;

                return -1;

        }

        if (wp->docfd < 0) {

                errno = EBADF;

                return -1;

        }

        pos = offset;

        switch (origin) {

        case SEEK_CUR:

                pos = wip->pos + offset;

                break;

        case SEEK_END:

                pos = wip->size + offset;

                break;

        default:

                break;

        }

        if (pos < 0) {

                errno = EBADF;

                return -1;

        }

        return (wip->pos = pos);

}

#endif /* WEBS_PAGE_ROM */

/******************************************************************************/