diff options
Diffstat (limited to 'serverboot/bunzip2.c')
| -rw-r--r-- | serverboot/bunzip2.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/serverboot/bunzip2.c b/serverboot/bunzip2.c deleted file mode 100644 index 9f79ade5..00000000 --- a/serverboot/bunzip2.c +++ /dev/null @@ -1,169 +0,0 @@ -/* 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; -} |