diff options
Diffstat (limited to 'libstore')
| -rw-r--r-- | libstore/ChangeLog | 10 | ||||
| -rw-r--r-- | libstore/Makefile | 5 | ||||
| -rw-r--r-- | libstore/bunzip2.c | 259 | ||||
| -rw-r--r-- | libstore/std.c | 2 | ||||
| -rw-r--r-- | libstore/store.h | 15 |
5 files changed, 288 insertions, 3 deletions
diff --git a/libstore/ChangeLog b/libstore/ChangeLog index 576482e4..a5674cbc 100644 --- a/libstore/ChangeLog +++ b/libstore/ChangeLog @@ -1,3 +1,13 @@ +1998-09-06 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp> + + * bunzip2.c: New file. + * store.h (store_bunzip2_create): New declarations. + (store_bunzip2_open): Likewise. + (store_bunzip2_class): Likewise. + * std.c (store_std_classes): Add store_bunzip2_class. + * Makefile (SRCS): Add bunzip2.c. + (UNZIP_OBJS): Add do-bunzip2.o. + 1998-12-27 Roland McGrath <roland@baalperazim.frob.com> * store.h: Remove defns of STORAGE_*, now in <hurd/hurd_types.h>. diff --git a/libstore/Makefile b/libstore/Makefile index edf47996..35f74fdc 100644 --- a/libstore/Makefile +++ b/libstore/Makefile @@ -25,11 +25,12 @@ makemode := library libname = libstore SRCS = create.c derive.c make.c rdwr.c set.c device.c file.c stripe.c \ enc.c encode.c decode.c clone.c argp.c std.c kids.c zero.c flags.c \ - open.c remap.c xinl.c task.c typed.c copy.c gunzip.c map.c mvol.c + open.c remap.c xinl.c task.c typed.c copy.c gunzip.c map.c mvol.c \ + bunzip2.c LCLHDRS=store.h installhdrs=store.h -UNZIP_OBJS = unzip.o inflate.o util.o +UNZIP_OBJS = unzip.o inflate.o util.o do-bunzip2.o OBJS = $(SRCS:.c=.o) $(UNZIP_OBJS) # Look for zip stuff diff --git a/libstore/bunzip2.c b/libstore/bunzip2.c new file mode 100644 index 00000000..e2858322 --- /dev/null +++ b/libstore/bunzip2.c @@ -0,0 +1,259 @@ +/* Decompressing store backend + + Copyright (C) 1998 Free Software Foundation, Inc. + Written by okuji@kuicr.kyoto-u.ac.jp <okuji@kuicr.kyoto-u.ac.jp> + 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 "store.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. */ +static error_t +bunzip2 (struct store *from, void **buf, size_t *buf_len) +{ + /* Callbacks from 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; + error_t zerr; + + /* vm_alloced buffer for the input store. */ + void *in_buf = 0; + size_t in_buf_len = 0; + size_t in_buf_offs = 0; /* Offset of read point in IN_BUF. */ + off_t in_buf_addr = 0; /* Address in FROM of *next* IN_BUF. */ + + /* Buffer input in units that are least IN_BUFFERING bytes, but are also a + multiple of FROM's block size. */ + size_t in_addr_mask = ((1 << from->log2_block_size) - 1); + size_t in_buffering = ((IN_BUFFERING + in_addr_mask) & ~in_addr_mask); + + /* Read at most MAXREAD (or 0 if eof) bytes into BUF from our current + position in FROM. */ + int zread (char *buf, size_t maxread) + { + size_t did_read = 0; + + while (maxread > 0) + { + size_t left = in_buf_len - in_buf_offs; + + if (left > 0) + /* Fill BUF with what we can from IN_BUF. */ + { + if (left > maxread) + left = maxread; + bcopy (in_buf + in_buf_offs, buf, left); + in_buf_offs += left; + buf += left; + maxread -= left; + did_read += left; + } + + /* Limit MAXREAD to the number of bytes left in the input. */ + if (maxread > (from->size - (in_buf_addr << from->log2_block_size))) + maxread = from->size - (in_buf_addr << from->log2_block_size); + + if (maxread > 0) + /* Have to fill IN_BUF again. */ + { + void *new_in_buf = in_buf; + size_t new_in_buf_len = in_buf_len; + + zerr = store_read (from, in_buf_addr, in_buffering, + &new_in_buf, &new_in_buf_len); + if (zerr) + longjmp (zerr_jmp_buf, 1); + + in_buf_addr += (new_in_buf_len >> from->log2_block_size); + + if (new_in_buf != in_buf) + { + if (in_buf_len > 0) + vm_deallocate (mach_task_self (), + (vm_address_t)in_buf, in_buf_len); + in_buf = new_in_buf; + in_buf_len = new_in_buf_len; + } + + in_buf_offs = 0; + } + } + return did_read; + } + + size_t out_buf_offs = 0; /* Position in the output buffer. */ + + /* Write compress 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->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 (in_buf_len > 0) + vm_deallocate (mach_task_self (), (vm_address_t)in_buf, in_buf_len); + + 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; +} + +/* Return a new store in STORE which contains a snapshot of the uncompressed + contents of the store FROM; FROM is consumed. */ +error_t +store_bunzip2_create (struct store *from, int flags, struct store **store) +{ + void *buf; + size_t buf_len; + error_t err = bunzip2 (from, &buf, &buf_len); + + if (! err) + { + err = store_buffer_create (buf, buf_len, flags, store); + if (err) + vm_deallocate (mach_task_self (), (vm_address_t)buf, buf_len); + else + store_free (from); + } + + return err; +} + +/* Open the bunzip2 NAME -- which consists of another store-class name, a ':', + and a name for that store class to open -- and return the corresponding + store in STORE. CLASSES is used to select classes specified by the type + name; if it is 0, STORE_STD_CLASSES is used. */ +error_t +store_bunzip2_open (const char *name, int flags, + const struct store_class *const *classes, + struct store **store) +{ + struct store *from; + error_t err = + store_typed_open (name, flags | STORE_HARD_READONLY, classes, &from); + + if (! err) + { + err = store_bunzip2_create (from, flags, store); + if (err) + store_free (from); + } + + return err; +} + +struct store_class +store_bunzip2_class = { -1, "bunzip2", open: store_bunzip2_open }; diff --git a/libstore/std.c b/libstore/std.c index 466fa261..e42e2094 100644 --- a/libstore/std.c +++ b/libstore/std.c @@ -26,7 +26,7 @@ store_std_classes[] = &store_device_class, &store_file_class, &store_zero_class, &store_task_class, &store_ileave_class, &store_concat_class, &store_remap_class, &store_query_class, &store_copy_class, &store_gunzip_class, - &store_typed_open_class, + &store_bunzip2_class, &store_typed_open_class, 0 }; diff --git a/libstore/store.h b/libstore/store.h index 88f5d635..f0b20b9e 100644 --- a/libstore/store.h +++ b/libstore/store.h @@ -444,6 +444,20 @@ error_t store_gunzip_open (const char *name, int flags, const struct store_class *const *classes, struct store **store); +/* Return a new store in STORE which contains a snapshot of the uncompressed + contents of the store FROM; FROM is consumed. BLOCK_SIZE is the desired + block size of the result. */ +error_t store_bunzip2_create (struct store *from, int flags, + struct store **store); + +/* Open the bunzip2 NAME -- which consists of another store-class name, a ':', + and a name for that store class to open -- and return the corresponding + store in STORE. CLASSES is used to select classes specified by the type + name; if it is 0, STORE_STD_CLASSES is used. */ +error_t store_bunzip2_open (const char *name, int flags, + const struct store_class *const *classes, + struct store **store); + /* Return a new store in STORE that multiplexes multiple physical volumes from PHYS as one larger virtual volume. SWAP_VOLS is a function that will be called whenever the volume currently active isn't correct. PHYS is @@ -467,6 +481,7 @@ extern const struct store_class store_remap_class; extern const struct store_class store_query_class; extern const struct store_class store_copy_class; extern const struct store_class store_gunzip_class; +extern const struct store_class store_bunzip2_class; extern const struct store_class store_typed_open_class; /* The following are not included in STORE_STD_CLASSES. */ |