quakeforge/libs/util/quakeio.c

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/*
quakeio.c
(description)
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((unused)) const char rcsid[] =
"$Id$";
#ifdef HAVE_ZLIB
# include <zlib.h>
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef _MSC_VER
# define _POSIX_
#endif
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>
#include <errno.h>
#include "QF/dstring.h"
#include "QF/qendian.h"
#include "QF/quakefs.h"
#include "QF/quakeio.h"
#ifdef WIN32
# ifndef __BORLANDC__
# define setmode _setmode
# define O_BINARY _O_BINARY
# endif
#endif
struct QFile_s {
FILE *file;
#ifdef HAVE_ZLIB
gzFile *gzfile;
#endif
off_t size;
off_t start;
int c;
};
int
Qrename (const char *old, const char *new)
{
return rename (old, new);
}
int
Qremove (const char *path)
{
return remove (path);
}
int
Qfilesize (QFile *file)
{
return file->size;
}
static int
check_file (int fd, int offs, int len, int *zip)
{
unsigned char id[2], len_bytes[4];
if (offs < 0 || len < 0) {
// normal file
offs = 0;
len = lseek (fd, 0, SEEK_END);
lseek (fd, 0, SEEK_SET);
}
if (*zip) {
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int r;
lseek (fd, offs, SEEK_SET);
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r = read (fd, id, 2);
if (r == 2 && id[0] == 0x1f && id[1] == 0x8b && len >= 6) {
lseek (fd, offs + len - 4, SEEK_SET);
read (fd, len_bytes, 4);
len = ((len_bytes[3] << 24)
| (len_bytes[2] << 16)
| (len_bytes[1] << 8)
| (len_bytes[0]));
} else {
*zip = 0;
}
}
lseek (fd, offs, SEEK_SET);
return len;
}
QFile *
Qopen (const char *path, const char *mode)
{
QFile *file;
char *m, *p;
int reading = 0;
int zip = 0;
int size = -1;
m = alloca (strlen (mode) + 1);
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for (p = m; *mode && p - m < ((int) sizeof (m) - 1); mode++) {
if (*mode == 'z') {
zip = 1;
continue;
}
if (*mode == 'r') {
reading = 1;
}
#ifndef HAVE_ZLIB
if (strchr ("0123456789fh", *mode)) {
continue;
}
#endif
*p++ = *mode;
}
*p = 0;
if (reading) {
int fd = open (path, O_RDONLY);
if (fd != -1) {
size = check_file (fd, -1, -1, &zip);
close (fd);
}
}
file = calloc (sizeof (*file), 1);
if (!file)
return 0;
file->size = size;
#ifdef HAVE_ZLIB
if (zip) {
file->gzfile = gzopen (path, m);
if (!file->gzfile) {
free (file);
return 0;
}
} else
#endif
{
file->file = fopen (path, m);
if (!file->file) {
free (file);
return 0;
}
}
file->c = -1;
return file;
}
QFile *
Qdopen (int fd, const char *mode)
{
QFile *file;
char *m, *p;
int zip = 0;
m = alloca (strlen (mode) + 1);
#ifdef WIN32
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setmode (fd, O_BINARY);
#endif
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for (p = m; *mode && p - m < ((int) sizeof (m) - 1); mode++) {
if (*mode == 'z') {
zip = 1;
continue;
}
*p++ = *mode;
}
*p = 0;
file = calloc (sizeof (*file), 1);
if (!file)
return 0;
#ifdef HAVE_ZLIB
if (zip) {
file->gzfile = gzdopen (fd, m);
if (!file->gzfile) {
free (file);
return 0;
}
} else
#endif
{
file->file = fdopen (fd, m);
if (!file->file) {
free (file);
return 0;
}
}
file->c = -1;
return file;
}
QFile *
Qsubopen (const char *path, int offs, int len, int zip)
{
int fd = open (path, O_RDONLY);
QFile *file;
if (fd == -1)
return 0;
#ifdef WIN32
setmode (fd, O_BINARY);
#endif
len = check_file (fd, offs, len, &zip);
file = Qdopen (fd, zip ? "rbz" : "rb");
file->size = len;
file->start = offs;
return file;
}
void
Qclose (QFile *file)
{
if (file->file)
fclose (file->file);
#ifdef HAVE_ZLIB
else
gzclose (file->gzfile);
#endif
free (file);
}
int
Qread (QFile *file, void *buf, int count)
{
int offs = 0;
int ret;
if (file->c != -1) {
char *b = buf;
*b++ = file->c;
buf = b;
offs = 1;
file->c = -1;
count--;
}
if (file->file)
ret = fread (buf, 1, count, file->file);
else
#ifdef HAVE_ZLIB
ret = gzread (file->gzfile, buf, count);
#else
return -1;
#endif
return ret == -1 ? ret : ret + offs;
}
int
Qwrite (QFile *file, const void *buf, int count)
{
if (file->file)
return fwrite (buf, 1, count, file->file);
#ifdef HAVE_ZLIB
else
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return gzwrite (file->gzfile, (const voidp)buf, count);
#else
return -1;
#endif
}
int
Qprintf (QFile *file, const char *fmt, ...)
{
va_list args;
int ret = -1;
va_start (args, fmt);
if (file->file)
ret = vfprintf (file->file, fmt, args);
#ifdef HAVE_ZLIB
else {
static dstring_t *buf;
if (!buf)
buf = dstring_new ();
va_start (args, fmt);
dvsprintf (buf, fmt, args);
va_end (args);
ret = strlen (buf->str);
if (ret > 0)
ret = gzwrite (file->gzfile, buf, (unsigned) ret);
}
#endif
va_end (args);
return ret;
}
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int
Qputs (QFile *file, const char *buf)
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{
if (file->file)
return fputs (buf, file->file);
#ifdef HAVE_ZLIB
else
return gzputs (file->gzfile, buf);
#else
return 0;
#endif
}
char *
Qgets (QFile *file, char *buf, int count)
{
char *ret = buf;
if (file->c != -1) {
*buf++ = file->c;
count--;
file->c = -1;
if (!count)
return ret;
}
if (file->file)
buf = fgets (buf, count, file->file);
#ifdef HAVE_ZLIB
else
buf = gzgets (file->gzfile, buf, count);
#else
return 0;
#endif
return buf ? ret : 0;
}
int
Qgetc (QFile *file)
{
if (file->c != -1) {
int c = file->c;
file->c = -1;
return c;
}
if (file->file)
return fgetc (file->file);
#ifdef HAVE_ZLIB
else
return gzgetc (file->gzfile);
#else
return -1;
#endif
}
int
Qputc (QFile *file, int c)
{
if (file->file)
return fputc (c, file->file);
#ifdef HAVE_ZLIB
else
return gzputc (file->gzfile, c);
#else
return -1;
#endif
}
int
Qungetc (QFile *file, int c)
{
if (file->c == -1)
file->c = (byte) c;
return c;
}
int
Qseek (QFile *file, long offset, int whence)
{
file->c = -1;
if (file->file) {
int res;
switch (whence) {
case SEEK_SET:
res = fseek (file->file, file->start + offset, whence);
break;
case SEEK_CUR:
res = fseek (file->file, offset, whence);
break;
case SEEK_END:
if (file->size == -1) {
// we don't know the size (due to writing) so punt and
// pass on the request as-is
res = fseek (file->file, offset, SEEK_END);
} else {
res = fseek (file->file,
file->start + file->size - offset, SEEK_SET);
}
break;
default:
errno = EINVAL;
return -1;
}
if (res != -1)
res = ftell (file->file) - file->start;
return res;
}
#ifdef HAVE_ZLIB
else {
// libz seems to keep track of the true start position itself
// doesn't support SEEK_END, though
return gzseek (file->gzfile, offset, whence);
}
#else
return -1;
#endif
}
long
Qtell (QFile *file)
{
int offs;
int ret;
offs = (file->c != -1) ? 1 : 0;
if (file->file)
ret = ftell (file->file) - file->start;
else
#ifdef HAVE_ZLIB
ret = gztell (file->gzfile); //FIXME does gztell do the right thing?
#else
return -1;
#endif
return ret == -1 ? ret : ret - offs;
}
int
Qflush (QFile *file)
{
if (file->file)
return fflush (file->file);
#ifdef HAVE_ZLIB
else
return gzflush (file->gzfile, Z_SYNC_FLUSH);
#else
return -1;
#endif
}
int
Qeof (QFile *file)
{
if (file->c != -1)
return 0;
if (file->file)
return feof (file->file);
#ifdef HAVE_ZLIB
else
return gzeof (file->gzfile);
#else
return -1;
#endif
}
/*
Qgetline
Dynamic length version of Qgets. DO NOT free the buffer.
*/
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const char *
Qgetline (QFile *file)
{
static int size = 256;
static char *buf = 0;
int len;
if (!buf) {
buf = malloc (size);
if (!buf)
return 0;
}
if (!Qgets (file, buf, size))
return 0;
len = strlen (buf);
while (buf[len - 1] != '\n') {
char *t = realloc (buf, size + 256);
if (!t)
return 0;
buf = t;
size += 256;
if (!Qgets (file, buf + len, size - len))
break;
len = strlen (buf);
}
return buf;
}