mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-26 22:31:05 +00:00
609 lines
10 KiB
C
609 lines
10 KiB
C
/*
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quakeio.c
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(description)
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 1999,2000 contributors of the QuakeForge project
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Please see the file "AUTHORS" for a list of contributors
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] =
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"$Id$";
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#ifdef HAVE_ZLIB
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# include <zlib.h>
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_MALLOC_H
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#include <malloc.h>
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#endif
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#ifdef HAVE_IO_H
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#include <io.h>
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#endif
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#include <limits.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "QF/dstring.h"
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#include "QF/qendian.h"
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#include "QF/quakefs.h"
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#include "QF/quakeio.h"
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#ifdef _WIN32
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# ifndef __BORLANDC__
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# define setmode _setmode
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# define O_BINARY _O_BINARY
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# endif
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#endif
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#define QF_ZIP 1
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#define QF_READ 2
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struct QFile_s {
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FILE *file;
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#ifdef HAVE_ZLIB
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gzFile *gzfile;
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#endif
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off_t size;
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off_t start;
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off_t pos;
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int c;
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int sub;
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};
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VISIBLE int
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Qrename (const char *old_path, const char *new_path)
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{
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return rename (old_path, new_path);
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}
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VISIBLE int
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Qremove (const char *path)
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{
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return remove (path);
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}
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VISIBLE int
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Qfilesize (QFile *file)
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{
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return file->size;
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}
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static int
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check_file (int fd, int offs, int len, int *zip)
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{
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unsigned char id[2], len_bytes[4];
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if (offs < 0 || len < 0) {
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// normal file
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offs = 0;
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len = lseek (fd, 0, SEEK_END);
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lseek (fd, 0, SEEK_SET);
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}
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if (zip && *zip) {
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int r;
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lseek (fd, offs, SEEK_SET);
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r = read (fd, id, 2);
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if (r == 2 && id[0] == 0x1f && id[1] == 0x8b && len >= 6 &&
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lseek (fd, offs + len - 4, SEEK_SET) >= 0 &&
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read (fd, len_bytes, 4) == 4) {
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len = ((len_bytes[3] << 24)
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| (len_bytes[2] << 16)
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| (len_bytes[1] << 8)
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| (len_bytes[0]));
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} else {
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*zip = 0;
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}
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}
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lseek (fd, offs, SEEK_SET);
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return len;
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}
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static int
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file_mode (const char *mode, char *out)
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{
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int flags = 0;
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char *p;
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for (p = out; *mode; mode++) {
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if (*mode == 'z') {
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flags |= QF_ZIP;
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continue;
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}
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if (*mode == 'r' || ((*mode == 'w' || *mode == 'a') && *mode == '+')) {
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flags |= QF_READ;
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}
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#ifndef HAVE_ZLIB
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if (strchr ("0123456789fh", *mode)) {
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continue;
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}
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#endif
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if (p)
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*p++ = *mode;
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}
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if (p)
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*p = 0;
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return flags;
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}
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VISIBLE QFile *
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Qopen (const char *path, const char *mode)
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{
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QFile *file;
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char *m;
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int flags, reading, zip;
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int size = -1;
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m = alloca (strlen (mode) + 1);
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flags = file_mode (mode, m);
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zip = flags & QF_ZIP;
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reading = flags & QF_READ;
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if (reading) {
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int fd = open (path, O_RDONLY);
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if (fd != -1) {
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size = check_file (fd, -1, -1, &zip);
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close (fd);
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}
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}
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file = calloc (sizeof (*file), 1);
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if (!file)
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return 0;
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file->size = size;
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#ifdef HAVE_ZLIB
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if (zip) {
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file->gzfile = gzopen (path, m);
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if (!file->gzfile) {
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free (file);
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return 0;
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}
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} else
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#endif
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{
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file->file = fopen (path, m);
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if (!file->file) {
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free (file);
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return 0;
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}
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}
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file->c = -1;
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return file;
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}
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VISIBLE QFile *
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Qdopen (int fd, const char *mode)
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{
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QFile *file;
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char *m, *p;
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int zip = 0;
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int len = strlen (mode);
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m = alloca (len + 1);
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#ifdef _WIN32
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setmode (fd, O_BINARY);
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#endif
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for (p = m; *mode && p - m < len; mode++) {
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if (*mode == 'z') {
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zip = 1;
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continue;
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}
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*p++ = *mode;
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}
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*p = 0;
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file = calloc (sizeof (*file), 1);
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if (!file)
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return 0;
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#ifdef HAVE_ZLIB
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if (zip) {
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file->gzfile = gzdopen (fd, m);
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if (!file->gzfile) {
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free (file);
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return 0;
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}
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} else
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#endif
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{
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file->file = fdopen (fd, m);
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if (!file->file) {
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free (file);
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return 0;
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}
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}
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file->c = -1;
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return file;
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}
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VISIBLE QFile *
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Qfopen (FILE *file, const char *mode)
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{
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QFile *qfile;
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int flags = file_mode (mode, 0);
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if (!file)
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return 0;
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qfile = calloc (sizeof (*qfile), 1);
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if (!qfile)
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return 0;
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qfile->file = file;
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if (flags & QF_READ)
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qfile->size = check_file (fileno (file), -1, -1, 0);
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qfile->c = -1;
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return qfile;
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}
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VISIBLE QFile *
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Qsubopen (const char *path, int offs, int len, int zip)
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{
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int fd = open (path, O_RDONLY);
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QFile *file;
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if (fd == -1)
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return 0;
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#ifdef _WIN32
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setmode (fd, O_BINARY);
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#endif
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len = check_file (fd, offs, len, &zip);
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file = Qdopen (fd, zip ? "rbz" : "rb");
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file->size = len;
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file->start = offs;
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file->sub = 1;
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return file;
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}
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VISIBLE void
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Qclose (QFile *file)
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{
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if (file->file)
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fclose (file->file);
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#ifdef HAVE_ZLIB
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else
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gzclose (file->gzfile);
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#endif
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free (file);
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}
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VISIBLE int
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Qread (QFile *file, void *buf, int count)
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{
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int offs = 0;
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int ret;
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if (file->c != -1) {
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char *b = buf;
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*b++ = file->c;
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buf = b;
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offs = 1;
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file->c = -1;
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count--;
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if (!count)
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return 1;
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}
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if (file->sub) {
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// sub-files are always opened in binary mode, so we don't need to
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// worry about character translation messing up count/pos. Normal
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// files can be left to the operating system to take care of EOF.
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if (file->pos + count > file->size)
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count = file->size - file->pos;
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if (count < 0)
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return -1;
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if (!count)
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return 0;
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}
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if (file->file)
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ret = fread (buf, 1, count, file->file);
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else
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#ifdef HAVE_ZLIB
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ret = gzread (file->gzfile, buf, count);
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#else
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return -1;
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#endif
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if (file->sub)
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file->pos += ret;
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return ret == -1 ? ret : ret + offs;
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}
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VISIBLE int
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Qwrite (QFile *file, const void *buf, int count)
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{
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if (file->sub) // can't write to a sub-file
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return -1;
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if (file->file)
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return fwrite (buf, 1, count, file->file);
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#ifdef HAVE_ZLIB
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else
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return gzwrite (file->gzfile, (const voidp)buf, count);
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#else
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return -1;
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#endif
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}
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VISIBLE int
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Qprintf (QFile *file, const char *fmt, ...)
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{
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va_list args;
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int ret = -1;
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if (file->sub) // can't write to a sub-file
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return -1;
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va_start (args, fmt);
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if (file->file)
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ret = vfprintf (file->file, fmt, args);
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#ifdef HAVE_ZLIB
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else {
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static dstring_t *buf;
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if (!buf)
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buf = dstring_new ();
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va_start (args, fmt);
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dvsprintf (buf, fmt, args);
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va_end (args);
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ret = strlen (buf->str);
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if (ret > 0)
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ret = gzwrite (file->gzfile, buf, (unsigned) ret);
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}
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#endif
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va_end (args);
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return ret;
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}
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VISIBLE int
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Qputs (QFile *file, const char *buf)
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{
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if (file->sub) // can't write to a sub-file
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return -1;
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if (file->file)
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return fputs (buf, file->file);
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#ifdef HAVE_ZLIB
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else
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return gzputs (file->gzfile, buf);
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#else
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return 0;
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#endif
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}
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VISIBLE char *
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Qgets (QFile *file, char *buf, int count)
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{
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char *ret = buf;
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char c;
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while (buf - ret < count - 1) {
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c = Qgetc (file);
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if (c < 0)
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break;
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*buf++ = c;
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if (c == '\n')
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break;
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}
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if (buf == ret)
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return 0;
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*buf++ = 0;
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return ret;
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}
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VISIBLE int
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Qgetc (QFile *file)
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{
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if (file->c != -1) {
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int c = file->c;
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file->c = -1;
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return c;
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}
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if (file->sub) {
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if (file->pos >= file->size)
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return EOF;
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file->pos++;
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}
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if (file->file)
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return fgetc (file->file);
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#ifdef HAVE_ZLIB
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else
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return gzgetc (file->gzfile);
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#else
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return -1;
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#endif
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}
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VISIBLE int
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Qputc (QFile *file, int c)
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{
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if (file->sub) // can't write to a sub-file
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return -1;
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if (file->file)
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return fputc (c, file->file);
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#ifdef HAVE_ZLIB
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else
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return gzputc (file->gzfile, c);
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#else
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return -1;
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#endif
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}
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VISIBLE int
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Qungetc (QFile *file, int c)
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{
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if (file->c == -1)
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file->c = (byte) c;
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return c;
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}
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VISIBLE int
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Qseek (QFile *file, long offset, int whence)
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{
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int res;
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file->c = -1;
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if (file->file) {
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switch (whence) {
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case SEEK_SET:
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res = fseek (file->file, file->start + offset, whence);
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break;
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case SEEK_CUR:
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res = fseek (file->file, offset, whence);
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break;
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case SEEK_END:
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if (file->size == -1) {
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// we don't know the size (due to writing) so punt and
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// pass on the request as-is
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res = fseek (file->file, offset, SEEK_END);
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} else {
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res = fseek (file->file,
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file->start + file->size - offset, SEEK_SET);
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}
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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if (res != -1)
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res = ftell (file->file) - file->start;
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if (file->sub)
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file->pos = res;
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return res;
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}
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#ifdef HAVE_ZLIB
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else {
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// libz seems to keep track of the true start position itself
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// doesn't support SEEK_END, though
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res = gzseek (file->gzfile, offset, whence);
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if (file->sub)
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file->pos = res;
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return res;
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}
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#else
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return -1;
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#endif
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}
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VISIBLE long
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Qtell (QFile *file)
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{
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int offs;
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int ret;
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offs = (file->c != -1) ? 1 : 0;
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if (file->file)
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ret = ftell (file->file) - file->start;
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else
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#ifdef HAVE_ZLIB
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ret = gztell (file->gzfile); //FIXME does gztell do the right thing?
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#else
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return -1;
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#endif
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if (file->sub)
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file->pos = ret;
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return ret == -1 ? ret : ret - offs;
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}
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VISIBLE int
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Qflush (QFile *file)
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{
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if (file->file)
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return fflush (file->file);
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#ifdef HAVE_ZLIB
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else
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return gzflush (file->gzfile, Z_SYNC_FLUSH);
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#else
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return -1;
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#endif
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}
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VISIBLE int
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Qeof (QFile *file)
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{
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if (file->c != -1)
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return 0;
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if (file->sub)
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return file->pos >= file->size;
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if (file->file)
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return feof (file->file);
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#ifdef HAVE_ZLIB
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else
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return gzeof (file->gzfile);
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#else
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return -1;
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#endif
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}
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/*
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Qgetline
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Dynamic length version of Qgets. Do NOT free the buffer.
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*/
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VISIBLE const char *
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Qgetline (QFile *file)
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{
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static int size = 256;
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static char *buf = 0;
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int len;
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if (!buf) {
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buf = malloc (size);
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if (!buf)
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return 0;
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}
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if (!Qgets (file, buf, size))
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return 0;
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len = strlen (buf);
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while (len && buf[len - 1] != '\n') {
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char *t = realloc (buf, size + 256);
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if (!t)
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return 0;
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buf = t;
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size += 256;
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if (!Qgets (file, buf + len, size - len))
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break;
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len = strlen (buf);
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}
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return buf;
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}
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