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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
#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>
#if defined(_WIN32) && defined(HAVE_MALLOC_H)
#include <malloc.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#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
#define QF_ZIP 1
#define QF_READ 2
struct QFile_s {
FILE *file;
#ifdef HAVE_ZLIB
gzFile gzfile;
#endif
off_t size;
off_t start;
off_t pos;
int c;
int sub;
};
VISIBLE int
Qrename (const char *old_path, const char *new_path)
{
return rename (old_path, new_path);
}
VISIBLE int
Qremove (const char *path)
{
return remove (path);
}
VISIBLE 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 && *zip) {
int r;
lseek (fd, offs, SEEK_SET);
r = read (fd, id, 2);
if (r == 2 && id[0] == 0x1f && id[1] == 0x8b && len >= 6 &&
lseek (fd, offs + len - 4, SEEK_SET) >= 0 &&
read (fd, len_bytes, 4) == 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;
}
static int
file_mode (const char *mode, char *out)
{
int flags = 0;
char *p;
for (p = out; *mode; mode++) {
if (*mode == 'z') {
flags |= QF_ZIP;
continue;
}
if (*mode == 'r' || ((*mode == 'w' || *mode == 'a') && *mode == '+')) {
flags |= QF_READ;
}
#ifndef HAVE_ZLIB
if (strchr ("0123456789fh", *mode)) {
continue;
}
#endif
if (p)
*p++ = *mode;
}
if (p)
*p = 0;
return flags;
}
VISIBLE QFile *
Qopen (const char *path, const char *mode)
{
QFile *file;
char *m;
int flags, reading, zip;
int size = -1;
m = alloca (strlen (mode) + 1);
flags = file_mode (mode, m);
zip = flags & QF_ZIP;
reading = flags & QF_READ;
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;
}
VISIBLE QFile *
Qdopen (int fd, const char *mode)
{
QFile *file;
char *m, *p;
#ifdef HAVE_ZLIB
int zip = 0;
#endif
int len = strlen (mode);
m = alloca (len + 1);
#ifdef _WIN32
setmode (fd, O_BINARY);
#endif
for (p = m; *mode && p - m < len; mode++) {
if (*mode == 'z') {
#ifdef HAVE_ZLIB
zip = 1;
#endif
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;
}
VISIBLE QFile *
Qfopen (FILE *file, const char *mode)
{
QFile *qfile;
int flags = file_mode (mode, 0);
if (!file)
return 0;
qfile = calloc (sizeof (*qfile), 1);
if (!qfile)
return 0;
qfile->file = file;
if (flags & QF_READ)
qfile->size = check_file (fileno (file), -1, -1, 0);
qfile->c = -1;
return qfile;
}
VISIBLE 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;
file->sub = 1;
return file;
}
VISIBLE void
Qclose (QFile *file)
{
if (file->file)
fclose (file->file);
#ifdef HAVE_ZLIB
else
gzclose (file->gzfile);
#endif
free (file);
}
VISIBLE 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 (!count)
return 1;
}
if (file->sub) {
// sub-files are always opened in binary mode, so we don't need to
// worry about character translation messing up count/pos. Normal
// files can be left to the operating system to take care of EOF.
if (file->pos + count > file->size)
count = file->size - file->pos;
if (count < 0)
return -1;
if (!count)
return 0;
}
if (file->file)
ret = fread (buf, 1, count, file->file);
else
#ifdef HAVE_ZLIB
ret = gzread (file->gzfile, buf, count);
#else
return -1;
#endif
if (file->sub)
file->pos += ret;
return ret == -1 ? ret : ret + offs;
}
VISIBLE int
Qwrite (QFile *file, const void *buf, int count)
{
if (file->sub) // can't write to a sub-file
return -1;
if (file->file)
return fwrite (buf, 1, count, file->file);
#ifdef HAVE_ZLIB
else
return gzwrite (file->gzfile, (const voidp)buf, count);
#else
return -1;
#endif
}
VISIBLE int
Qprintf (QFile *file, const char *fmt, ...)
{
va_list args;
int ret = -1;
if (file->sub) // can't write to a sub-file
return -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;
}
VISIBLE int
Qputs (QFile *file, const char *buf)
{
if (file->sub) // can't write to a sub-file
return -1;
if (file->file)
return fputs (buf, file->file);
#ifdef HAVE_ZLIB
else
return gzputs (file->gzfile, buf);
#else
return 0;
#endif
}
VISIBLE char *
Qgets (QFile *file, char *buf, int count)
{
char *ret = buf;
char c;
while (buf - ret < count - 1) {
c = Qgetc (file);
if (c < 0)
break;
*buf++ = c;
if (c == '\n')
break;
}
if (buf == ret)
return 0;
*buf++ = 0;
return ret;
}
VISIBLE int
Qgetc (QFile *file)
{
if (file->c != -1) {
int c = file->c;
file->c = -1;
return c;
}
if (file->sub) {
if (file->pos >= file->size)
return EOF;
file->pos++;
}
if (file->file)
return fgetc (file->file);
#ifdef HAVE_ZLIB
else
return gzgetc (file->gzfile);
#else
return -1;
#endif
}
VISIBLE int
Qputc (QFile *file, int c)
{
if (file->sub) // can't write to a sub-file
return -1;
if (file->file)
return fputc (c, file->file);
#ifdef HAVE_ZLIB
else
return gzputc (file->gzfile, c);
#else
return -1;
#endif
}
VISIBLE int
Qungetc (QFile *file, int c)
{
if (file->c == -1)
file->c = (byte) c;
return c;
}
VISIBLE int
Qseek (QFile *file, long offset, int whence)
{
int res;
file->c = -1;
if (file->file) {
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;
if (file->sub)
file->pos = res;
return res;
}
#ifdef HAVE_ZLIB
else {
// libz seems to keep track of the true start position itself
// doesn't support SEEK_END, though
res = gzseek (file->gzfile, offset, whence);
if (file->sub)
file->pos = res;
return res;
}
#else
return -1;
#endif
}
VISIBLE 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
if (file->sub)
file->pos = ret;
return ret == -1 ? ret : ret - offs;
}
VISIBLE 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
}
VISIBLE int
Qeof (QFile *file)
{
if (file->c != -1)
return 0;
if (file->sub)
return file->pos >= file->size;
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.
*/
VISIBLE 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 (len && 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;
}
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