586 lines
14 KiB
C
586 lines
14 KiB
C
/* NetHack 3.6 dlb.c $NHDT-Date: 1446975464 2015/11/08 09:37:44 $ $NHDT-Branch: master $:$NHDT-Revision: 1.15 $ */
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/* Copyright (c) Kenneth Lorber, Bethesda, Maryland, 1993. */
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/* NetHack may be freely redistributed. See license for details. */
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#include "config.h"
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#include "dlb.h"
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#if defined(VERSION_IN_DLB_FILENAME)
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#include "patchlevel.h"
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#endif
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#ifdef __DJGPP__
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#include <string.h>
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#endif
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#define DATAPREFIX 4 /* see decl.h */
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#ifdef DLB
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/*
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* Data librarian. Present a STDIO-like interface to NetHack while
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* multiplexing on one or more "data libraries". If a file is not found
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* in a given library, look for it outside the libraries.
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*/
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typedef struct dlb_procs {
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boolean NDECL((*dlb_init_proc));
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void NDECL((*dlb_cleanup_proc));
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boolean FDECL((*dlb_fopen_proc), (DLB_P, const char *, const char *));
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int FDECL((*dlb_fclose_proc), (DLB_P));
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int FDECL((*dlb_fread_proc), (char *, int, int, DLB_P));
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int FDECL((*dlb_fseek_proc), (DLB_P, long, int));
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char *FDECL((*dlb_fgets_proc), (char *, int, DLB_P));
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int FDECL((*dlb_fgetc_proc), (DLB_P));
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long FDECL((*dlb_ftell_proc), (DLB_P));
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} dlb_procs_t;
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#if defined(VERSION_IN_DLB_FILENAME)
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char dlbfilename[MAX_DLB_FILENAME];
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#endif
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/* without extern.h via hack.h, these haven't been declared for us */
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extern FILE *FDECL(fopen_datafile, (const char *, const char *, int));
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#ifdef DLBLIB
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/*
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* Library Implementation:
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*
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* When initialized, we open all library files and read in their tables
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* of contents. The library files stay open all the time. When
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* a open is requested, the libraries' directories are searched. If
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* successful, we return a descriptor that contains the library, file
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* size, and current file mark. This descriptor is used for all
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* successive calls.
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*
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* The ability to open more than one library is supported but used
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* only in the Amiga port (the second library holds the sound files).
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* For Unix, the idea would be to split the NetHack library
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* into text and binary parts, where the text version could be shared.
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*/
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#define MAX_LIBS 4
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static library dlb_libs[MAX_LIBS];
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static boolean FDECL(readlibdir, (library * lp));
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static boolean FDECL(find_file, (const char *name, library **lib,
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long *startp, long *sizep));
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static boolean NDECL(lib_dlb_init);
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static void NDECL(lib_dlb_cleanup);
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static boolean FDECL(lib_dlb_fopen, (dlb *, const char *, const char *));
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static int FDECL(lib_dlb_fclose, (dlb *));
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static int FDECL(lib_dlb_fread, (char *, int, int, dlb *));
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static int FDECL(lib_dlb_fseek, (dlb *, long, int));
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static char *FDECL(lib_dlb_fgets, (char *, int, dlb *));
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static int FDECL(lib_dlb_fgetc, (dlb *));
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static long FDECL(lib_dlb_ftell, (dlb *));
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/* not static because shared with dlb_main.c */
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boolean FDECL(open_library, (const char *lib_name, library *lp));
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void FDECL(close_library, (library * lp));
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/* without extern.h via hack.h, these haven't been declared for us */
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extern char *FDECL(eos, (char *));
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/*
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* Read the directory out of the library. Return 1 if successful,
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* 0 if it failed.
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*
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* NOTE: An improvement of the file structure should be the file
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* size as part of the directory entry or perhaps in place of the
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* offset -- the offset can be calculated by a running tally of
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* the sizes.
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*
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* Library file structure:
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*
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* HEADER:
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* %3ld library FORMAT revision (currently rev 1)
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* %1c space
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* %8ld # of files in archive (includes 1 for directory)
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* %1c space
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* %8ld size of allocation for string space for directory names
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* %1c space
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* %8ld library offset - sanity check - lseek target for start of first file
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* %1c space
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* %8ld size - sanity check - byte size of complete archive file
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*
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* followed by one DIRECTORY entry for each file in the archive, including
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* the directory itself:
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* %1c handling information (compression, etc.) Always ' ' in rev 1.
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* %s file name
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* %1c space
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* %8ld offset in archive file of start of this file
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* %c newline
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*
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* followed by the contents of the files
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*/
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#define DLB_MIN_VERS 1 /* min library version readable by this code */
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#define DLB_MAX_VERS 1 /* max library version readable by this code */
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/*
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* Read the directory from the library file. This will allocate and
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* fill in our globals. The file pointer is reset back to position
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* zero. If any part fails, leave nothing that needs to be deallocated.
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*
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* Return TRUE on success, FALSE on failure.
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*/
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static boolean
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readlibdir(lp)
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library *lp; /* library pointer to fill in */
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{
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int i;
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char *sp;
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long liboffset, totalsize;
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if (fscanf(lp->fdata, "%ld %ld %ld %ld %ld\n", &lp->rev, &lp->nentries,
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&lp->strsize, &liboffset, &totalsize) != 5)
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return FALSE;
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if (lp->rev > DLB_MAX_VERS || lp->rev < DLB_MIN_VERS)
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return FALSE;
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lp->dir = (libdir *) alloc(lp->nentries * sizeof(libdir));
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lp->sspace = (char *) alloc(lp->strsize);
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/* read in each directory entry */
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for (i = 0, sp = lp->sspace; i < lp->nentries; i++) {
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lp->dir[i].fname = sp;
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if (fscanf(lp->fdata, "%c%s %ld\n", &lp->dir[i].handling, sp,
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&lp->dir[i].foffset) != 3) {
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free((genericptr_t) lp->dir);
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free((genericptr_t) lp->sspace);
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lp->dir = (libdir *) 0;
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lp->sspace = (char *) 0;
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return FALSE;
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}
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sp = eos(sp) + 1;
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}
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/* calculate file sizes using offset information */
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for (i = 0; i < lp->nentries; i++) {
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if (i == lp->nentries - 1)
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lp->dir[i].fsize = totalsize - lp->dir[i].foffset;
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else
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lp->dir[i].fsize = lp->dir[i + 1].foffset - lp->dir[i].foffset;
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}
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(void) fseek(lp->fdata, 0L, SEEK_SET); /* reset back to zero */
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lp->fmark = 0;
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return TRUE;
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}
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/*
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* Look for the file in our directory structure. Return 1 if successful,
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* 0 if not found. Fill in the size and starting position.
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*/
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static boolean
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find_file(name, lib, startp, sizep)
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const char *name;
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library **lib;
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long *startp, *sizep;
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{
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int i, j;
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library *lp;
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for (i = 0; i < MAX_LIBS && dlb_libs[i].fdata; i++) {
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lp = &dlb_libs[i];
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for (j = 0; j < lp->nentries; j++) {
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if (FILENAME_CMP(name, lp->dir[j].fname) == 0) {
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*lib = lp;
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*startp = lp->dir[j].foffset;
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*sizep = lp->dir[j].fsize;
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return TRUE;
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}
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}
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}
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*lib = (library *) 0;
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*startp = *sizep = 0;
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return FALSE;
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}
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/*
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* Open the library of the given name and fill in the given library
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* structure. Return TRUE if successful, FALSE otherwise.
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*/
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boolean
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open_library(lib_name, lp)
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const char *lib_name;
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library *lp;
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{
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boolean status = FALSE;
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lp->fdata = fopen_datafile(lib_name, RDBMODE, DATAPREFIX);
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if (lp->fdata) {
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if (readlibdir(lp)) {
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status = TRUE;
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} else {
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(void) fclose(lp->fdata);
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lp->fdata = (FILE *) 0;
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}
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}
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return status;
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}
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void
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close_library(lp)
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library *lp;
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{
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(void) fclose(lp->fdata);
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free((genericptr_t) lp->dir);
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free((genericptr_t) lp->sspace);
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(void) memset((char *) lp, 0, sizeof(library));
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}
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/*
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* Open the library file once using stdio. Keep it open, but
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* keep track of the file position.
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*/
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static boolean
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lib_dlb_init(VOID_ARGS)
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{
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/* zero out array */
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(void) memset((char *) &dlb_libs[0], 0, sizeof(dlb_libs));
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#ifdef VERSION_IN_DLB_FILENAME
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build_dlb_filename((const char *) 0);
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#endif
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/* To open more than one library, add open library calls here. */
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if (!open_library(DLBFILE, &dlb_libs[0]))
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return FALSE;
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#ifdef DLBFILE2
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if (!open_library(DLBFILE2, &dlb_libs[1])) {
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close_library(&dlb_libs[0]);
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return FALSE;
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}
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#endif
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return TRUE;
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}
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static void
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lib_dlb_cleanup(VOID_ARGS)
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{
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int i;
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/* close the data file(s) */
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for (i = 0; i < MAX_LIBS && dlb_libs[i].fdata; i++)
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close_library(&dlb_libs[i]);
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}
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#ifdef VERSION_IN_DLB_FILENAME
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char *
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build_dlb_filename(lf)
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const char *lf;
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{
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Sprintf(dlbfilename, "%s%d%d%d",
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lf ? lf : DLBBASENAME, VERSION_MAJOR, VERSION_MINOR, PATCHLEVEL);
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return dlbfilename;
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}
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#endif
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/*ARGSUSED*/
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static boolean
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lib_dlb_fopen(dp, name, mode)
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dlb *dp;
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const char *name;
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const char *mode UNUSED;
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{
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long start, size;
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library *lp;
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/* look up file in directory */
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if (find_file(name, &lp, &start, &size)) {
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dp->lib = lp;
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dp->start = start;
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dp->size = size;
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dp->mark = 0;
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return TRUE;
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}
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return FALSE; /* failed */
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}
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/*ARGUSED*/
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static int
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lib_dlb_fclose(dp)
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dlb *dp UNUSED;
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{
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/* nothing needs to be done */
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return 0;
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}
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static int
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lib_dlb_fread(buf, size, quan, dp)
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char *buf;
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int size, quan;
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dlb *dp;
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{
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long pos, nread, nbytes;
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/* make sure we don't read into the next file */
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if ((dp->size - dp->mark) < (size * quan))
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quan = (dp->size - dp->mark) / size;
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if (quan == 0)
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return 0;
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pos = dp->start + dp->mark;
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if (dp->lib->fmark != pos) {
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fseek(dp->lib->fdata, pos, SEEK_SET); /* check for error??? */
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dp->lib->fmark = pos;
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}
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nread = fread(buf, size, quan, dp->lib->fdata);
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nbytes = nread * size;
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dp->mark += nbytes;
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dp->lib->fmark += nbytes;
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return nread;
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}
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static int
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lib_dlb_fseek(dp, pos, whence)
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dlb *dp;
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long pos;
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int whence;
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{
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long curpos;
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switch (whence) {
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case SEEK_CUR:
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curpos = dp->mark + pos;
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break;
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case SEEK_END:
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curpos = dp->size - pos;
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break;
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default: /* set */
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curpos = pos;
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break;
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}
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if (curpos < 0)
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curpos = 0;
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if (curpos > dp->size)
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curpos = dp->size;
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dp->mark = curpos;
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return 0;
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}
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static char *
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lib_dlb_fgets(buf, len, dp)
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char *buf;
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int len;
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dlb *dp;
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{
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int i;
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char *bp, c = 0;
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if (len <= 0)
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return buf; /* sanity check */
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/* return NULL on EOF */
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if (dp->mark >= dp->size)
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return (char *) 0;
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len--; /* save room for null */
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for (i = 0, bp = buf; i < len && dp->mark < dp->size && c != '\n';
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i++, bp++) {
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if (dlb_fread(bp, 1, 1, dp) <= 0)
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break; /* EOF or error */
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c = *bp;
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}
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*bp = '\0';
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#if defined(MSDOS) || defined(WIN32)
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if ((bp = index(buf, '\r')) != 0) {
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*bp++ = '\n';
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*bp = '\0';
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}
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#endif
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return buf;
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}
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static int
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lib_dlb_fgetc(dp)
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dlb *dp;
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{
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char c;
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if (lib_dlb_fread(&c, 1, 1, dp) != 1)
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return EOF;
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return (int) c;
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}
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static long
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lib_dlb_ftell(dp)
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dlb *dp;
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{
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return dp->mark;
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}
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const dlb_procs_t lib_dlb_procs = { lib_dlb_init, lib_dlb_cleanup,
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lib_dlb_fopen, lib_dlb_fclose,
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lib_dlb_fread, lib_dlb_fseek,
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lib_dlb_fgets, lib_dlb_fgetc,
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lib_dlb_ftell };
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#endif /* DLBLIB */
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#ifdef DLBRSRC
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const dlb_procs_t rsrc_dlb_procs = { rsrc_dlb_init, rsrc_dlb_cleanup,
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rsrc_dlb_fopen, rsrc_dlb_fclose,
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rsrc_dlb_fread, rsrc_dlb_fseek,
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rsrc_dlb_fgets, rsrc_dlb_fgetc,
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rsrc_dlb_ftell };
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#endif
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/* Global wrapper functions ------------------------------------------------
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*/
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#define do_dlb_init (*dlb_procs->dlb_init_proc)
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#define do_dlb_cleanup (*dlb_procs->dlb_cleanup_proc)
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#define do_dlb_fopen (*dlb_procs->dlb_fopen_proc)
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#define do_dlb_fclose (*dlb_procs->dlb_fclose_proc)
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#define do_dlb_fread (*dlb_procs->dlb_fread_proc)
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#define do_dlb_fseek (*dlb_procs->dlb_fseek_proc)
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#define do_dlb_fgets (*dlb_procs->dlb_fgets_proc)
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#define do_dlb_fgetc (*dlb_procs->dlb_fgetc_proc)
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#define do_dlb_ftell (*dlb_procs->dlb_ftell_proc)
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static const dlb_procs_t *dlb_procs;
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static boolean dlb_initialized = FALSE;
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boolean
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dlb_init()
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{
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if (!dlb_initialized) {
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#ifdef DLBLIB
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dlb_procs = &lib_dlb_procs;
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#endif
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#ifdef DLBRSRC
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dlb_procs = &rsrc_dlb_procs;
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#endif
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if (dlb_procs)
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dlb_initialized = do_dlb_init();
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}
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return dlb_initialized;
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}
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void
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dlb_cleanup()
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{
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if (dlb_initialized) {
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do_dlb_cleanup();
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dlb_initialized = FALSE;
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}
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}
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dlb *
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dlb_fopen(name, mode)
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const char *name, *mode;
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{
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FILE *fp;
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dlb *dp;
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if (!dlb_initialized)
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return (dlb *) 0;
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/* only support reading; ignore possible binary flag */
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if (!mode || mode[0] != 'r')
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return (dlb *) 0;
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dp = (dlb *) alloc(sizeof(dlb));
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if (do_dlb_fopen(dp, name, mode))
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dp->fp = (FILE *) 0;
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else if ((fp = fopen_datafile(name, mode, DATAPREFIX)) != 0)
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dp->fp = fp;
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else {
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/* can't find anything */
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free((genericptr_t) dp);
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dp = (dlb *) 0;
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}
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return dp;
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}
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int
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dlb_fclose(dp)
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dlb *dp;
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{
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int ret = 0;
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if (dlb_initialized) {
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if (dp->fp)
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ret = fclose(dp->fp);
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else
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ret = do_dlb_fclose(dp);
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free((genericptr_t) dp);
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}
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return ret;
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}
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int
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dlb_fread(buf, size, quan, dp)
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char *buf;
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int size, quan;
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dlb *dp;
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{
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if (!dlb_initialized || size <= 0 || quan <= 0)
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return 0;
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if (dp->fp)
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return (int) fread(buf, size, quan, dp->fp);
|
|
return do_dlb_fread(buf, size, quan, dp);
|
|
}
|
|
|
|
int
|
|
dlb_fseek(dp, pos, whence)
|
|
dlb *dp;
|
|
long pos;
|
|
int whence;
|
|
{
|
|
if (!dlb_initialized)
|
|
return EOF;
|
|
if (dp->fp)
|
|
return fseek(dp->fp, pos, whence);
|
|
return do_dlb_fseek(dp, pos, whence);
|
|
}
|
|
|
|
char *
|
|
dlb_fgets(buf, len, dp)
|
|
char *buf;
|
|
int len;
|
|
dlb *dp;
|
|
{
|
|
if (!dlb_initialized)
|
|
return (char *) 0;
|
|
if (dp->fp)
|
|
return fgets(buf, len, dp->fp);
|
|
return do_dlb_fgets(buf, len, dp);
|
|
}
|
|
|
|
int
|
|
dlb_fgetc(dp)
|
|
dlb *dp;
|
|
{
|
|
if (!dlb_initialized)
|
|
return EOF;
|
|
if (dp->fp)
|
|
return fgetc(dp->fp);
|
|
return do_dlb_fgetc(dp);
|
|
}
|
|
|
|
long
|
|
dlb_ftell(dp)
|
|
dlb *dp;
|
|
{
|
|
if (!dlb_initialized)
|
|
return 0;
|
|
if (dp->fp)
|
|
return ftell(dp->fp);
|
|
return do_dlb_ftell(dp);
|
|
}
|
|
|
|
#endif /* DLB */
|
|
|
|
/*dlb.c*/
|