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/* Modified by okuji@kuicr.kyoto-u.ac.jp for use in serverboot. */
/* Decompressing store backend
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at
your option) any later version.
The GNU Hurd 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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <stdio.h>
#include <string.h>
#include <setjmp.h>
#include <cthreads.h>
#include <errno.h>
#include <file_io.h>
#define IN_BUFFERING (256*1024)
#define OUT_BUFFERING (512*1024)
static struct mutex bunzip2_lock = MUTEX_INITIALIZER;
/* Uncompress the contents of FROM, which should contain a valid bzip2 file,
into memory, returning the result buffer in BUF & BUF_LEN. */
int
serverboot_bunzip2 (struct file *from, void **buf, size_t *buf_len)
{
/* Callbacks from do_bunzip2 for I/O and error interface. */
extern int (*unzip_read) (char *buf, size_t maxread);
extern void (*unzip_write) (const char *buf, size_t nwrite);
extern void (*unzip_read_error) (void);
extern void (*unzip_error) (const char *msg);
/* How we return errors from our hook functions. */
jmp_buf zerr_jmp_buf;
int zerr;
size_t offset = 0; /* Offset of read point in FROM. */
/* Read at most MAXREAD (or 0 if eof) bytes into BUF from our current
position in FROM. */
int zread (char *buf, size_t maxread)
{
vm_size_t resid;
size_t did_read;
if (from->f_size - offset < maxread)
did_read = from->f_size - offset;
else
did_read = maxread;
zerr = read_file (from, offset, buf, did_read, &resid);
if (zerr)
longjmp (zerr_jmp_buf, 1);
did_read -= resid;
offset += did_read;
return did_read;
}
size_t out_buf_offs = 0; /* Position in the output buffer. */
/* Write uncompress data to our output buffer. */
void zwrite (const char *wbuf, size_t nwrite)
{
size_t old_buf_len = *buf_len;
if (out_buf_offs + nwrite > old_buf_len)
/* Have to grow the output buffer. */
{
void *old_buf = *buf;
void *new_buf = old_buf + old_buf_len; /* First try. */
size_t new_buf_len = round_page (old_buf_len + old_buf_len + nwrite);
/* Try to grow the buffer. */
zerr =
vm_allocate (mach_task_self (),
(vm_address_t *)&new_buf, new_buf_len - old_buf_len,
0);
if (zerr)
/* Can't do that, try to make a bigger buffer elsewhere. */
{
new_buf = old_buf;
zerr =
vm_allocate (mach_task_self (),
(vm_address_t *)&new_buf, new_buf_len, 1);
if (zerr)
longjmp (zerr_jmp_buf, 1);
if (out_buf_offs > 0)
/* Copy the old buffer into the start of the new & free it. */
bcopy (old_buf, new_buf, out_buf_offs);
vm_deallocate (mach_task_self (),
(vm_address_t)old_buf, old_buf_len);
*buf = new_buf;
}
*buf_len = new_buf_len;
}
bcopy (wbuf, *buf + out_buf_offs, nwrite);
out_buf_offs += nwrite;
}
void zreaderr (void)
{
zerr = EIO;
longjmp (zerr_jmp_buf, 1);
}
void zerror (const char *msg)
{
zerr = EINVAL;
longjmp (zerr_jmp_buf, 2);
}
/* Try to guess a reasonable output buffer size. */
*buf_len = round_page (from->f_size * 2);
zerr = vm_allocate (mach_task_self (), (vm_address_t *)buf, *buf_len, 1);
if (zerr)
return zerr;
mutex_lock (&bunzip2_lock);
unzip_read = zread;
unzip_write = zwrite;
unzip_read_error = zreaderr;
unzip_error = zerror;
if (! setjmp (zerr_jmp_buf))
{
/* Call the bunzip2 engine. */
do_bunzip2 ();
zerr = 0;
}
mutex_unlock (&bunzip2_lock);
if (zerr)
{
if (*buf_len > 0)
vm_deallocate (mach_task_self (), (vm_address_t)*buf, *buf_len);
}
else if (out_buf_offs < *buf_len)
/* Trim the output buffer to be the right length. */
{
size_t end = round_page (out_buf_offs);
if (end < *buf_len)
vm_deallocate (mach_task_self (),
(vm_address_t)(*buf + end), *buf_len - end);
*buf_len = out_buf_offs;
}
return zerr;
}
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