*** empty log message ***
This commit is contained in:
jwalz
542
src/dlb.c
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542
src/dlb.c
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/* SCCS Id: @(#)dlb.c 3.3 97/07/29 */
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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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#ifdef __DJGPP__
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#include <string.h>
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#endif
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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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/* 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 *,BOOLEAN_P));
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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, long *startp,
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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",
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&lp->rev,&lp->nentries,&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) 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",
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&lp->dir[i].handling, sp, &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, FALSE);
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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()
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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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/* To open more than one library, add open library calls here. */
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if (!open_library(DLBFILE, &dlb_libs[0])) 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()
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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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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, *mode;
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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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static int
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lib_dlb_fclose(dp)
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dlb *dp;
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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) 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: curpos = dp->mark + pos; break;
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case SEEK_END: curpos = dp->size - pos; break;
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default: /* set */ curpos = pos; break;
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}
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if (curpos < 0) curpos = 0;
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if (curpos > dp->size) 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) return buf; /* sanity check */
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/* return NULL on EOF */
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if (dp->mark >= dp->size) return (char *) 0;
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len--; /* save room for null */
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for (i = 0, bp = buf;
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i < len && dp->mark < dp->size && c != '\n'; i++, bp++) {
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if (dlb_fread(bp, 1, 1, dp) <= 0) 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) 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 = {
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lib_dlb_init,
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lib_dlb_cleanup,
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lib_dlb_fopen,
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lib_dlb_fclose,
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lib_dlb_fread,
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lib_dlb_fseek,
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lib_dlb_fgets,
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lib_dlb_fgetc,
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lib_dlb_ftell
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};
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#endif /* DLBLIB */
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#ifdef DLBRSRC
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const dlb_procs_t rsrc_dlb_procs = {
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rsrc_dlb_init,
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rsrc_dlb_cleanup,
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rsrc_dlb_fopen,
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rsrc_dlb_fclose,
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rsrc_dlb_fread,
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rsrc_dlb_fseek,
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rsrc_dlb_fgets,
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rsrc_dlb_fgetc,
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rsrc_dlb_ftell
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};
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#endif
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/* Global wrapper functions ------------------------------------------------ */
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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) 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, FALSE)) != 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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||||
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||||
return dp;
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||||
}
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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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||||
int ret = 0;
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||||
|
||||
if (dlb_initialized) {
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||||
if (dp->fp) ret = fclose(dp->fp);
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||||
else ret = do_dlb_fclose(dp);
|
||||
|
||||
free((genericptr_t) dp);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int
|
||||
dlb_fread(buf, size, quan, dp)
|
||||
char *buf;
|
||||
int size, quan;
|
||||
dlb *dp;
|
||||
{
|
||||
if (!dlb_initialized || size <= 0 || quan <= 0) return 0;
|
||||
if (dp->fp) 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*/
|
||||
Reference in New Issue
Block a user