2002-03-11 Roland McGrath <roland@frob.com>

	* unzipstore.c: New file, broken out of bunzip2.c.
	* bunzip2.c: Most code moved to unzipstore.c, which we #include.
	(DO_UNZIP, UNZIP): New function, macro.
	* gunzip.c: Most code deleted, now in unzipstore.c, which we #include.
	(DO_UNZIP, UNZIP): New function, macro.
	* Makefile (DIST_FILES): New variable, list unzipstore.c here.
2002-02-08  Roland McGrath  <roland@frob.com>

	* Makefile (store-types): New variable.
	(all): Depend on $(store-types:%=libstore_%.a).
	(libstore_%.so.$(hurd-version)): New pattern rule.
	($(store-types:%=libstore_%.a): libstore_%.a): New static pattern rule
	to create `-lstore_TYPE' pseudo-objects (linker scripts) for each type.
	(libstore.so-LDLIBS): New variable, adds -ldl.
	(GUNZIP_OBJS, BUNZIP2_OBJS): New variables.
	(UNZIP_OBJS): Variable removed, replaced by those two.
	(OBJS): Update use.
	(libstore_gunzip.so.$(hurd-version)): Depend on PIC $(GUNZIP_OBJS).
	(libstore_bunzip2.so.$(hurd-version)): Depend on PIC $(BUNZIP2_OBJS).
	* unknown.c: Add STORE_STD_CLASS decl.
	* bunzip2.c: Likewise.
	* copy.c: Likewise.
	* device.c: Likewise.
	* file.c: Likewise.
	* gunzip.c: Likewise.
	* memobj.c: Likewise.
	* module.c: Likewise.
	* mvol.c: Likewise.
	* nbd.c: Likewise.
	* open.c: Likewise.
	* part.c: Likewise.
	* remap.c: Likewise.
	* stripe.c: Likewise.
	* stripe.c: Likewise.
	* task.c: Likewise.
	* typed.c: Likewise.
	* typed.c: Likewise.
	* unknown.c: Likewise.
	* url.c: Likewise.
	* zero.c: Likewise.

1 files changed, 12 insertions, 232 deletions

diff --git a/libstore/gunzip.c b/libstore/gunzip.c
index 5ebfbb7a..3bff6ead 100644
--- a/libstore/gunzip.c
+++ b/libstore/gunzip.c
@@ -1,6 +1,6 @@
 /* Decompressing store backend
 
-   Copyright (C) 1997, 1999 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1999, 2002 Free Software Foundation, Inc.
    Written by Miles Bader <miles@gnu.ai.mit.edu>
    This file is part of the GNU Hurd.
 
@@ -33,243 +33,23 @@
 #undef file_t
 #undef head
 
-#define IN_BUFFERING  (256*1024)
-#define OUT_BUFFERING (512*1024)
-
-static struct mutex unzip_lock = MUTEX_INITIALIZER;
-
-/* Uncompress the contents of FROM, which should contain a valid gzip file,
-   into memory, returning the result buffer in BUF & BUF_LEN.  */
 static error_t
-gunzip (struct store *from, void **buf, size_t *buf_len)
+DO_UNZIP (void)
 {
   /* Entry points to unzip engine.  */
   int get_method (int);
   extern long int bytes_out;
-  /* Callbacks from unzip 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)
-		    munmap (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 = mmap (0, new_buf_len, PROT_READ|PROT_WRITE, 
-			      MAP_ANON, 0, 0);
-	      zerr = (new_buf == (void *) -1) ? errno : 0;
-	      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);
-
-	      munmap (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);
-  *buf = mmap (0, *buf_len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
-  zerr = (*buf == (void *) -1) ? errno : 0;
-  if (zerr)
-    return zerr;
-
-  mutex_lock (&unzip_lock);
-
-  unzip_read = zread;
-  unzip_write = zwrite;
-  unzip_read_error = zreaderr;
-  unzip_error = zerror;
-
-  if (! setjmp (zerr_jmp_buf))
-    {
-      if (get_method (0) != 0)
-	/* Not a happy gzip file.  */
-	zerr = EINVAL;
-      else
-	/* Matched gzip magic number.  Ready to unzip.
-	   Set up the output stream and let 'er rip.  */
-	{
-	  /* Call the gunzip engine.  */
-	  bytes_out = 0;
-	  unzip (17, 23);	/* Arguments ignored.  */
-	  zerr = 0;
-	}
-    }
-
-  mutex_unlock (&unzip_lock);
-
-  if (in_buf_len > 0)
-    munmap (in_buf, in_buf_len);
-
-  if (zerr)
-    {
-      if (*buf_len > 0)
-	munmap (*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)
-	munmap (*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_gunzip_create (struct store *from, int flags, struct store **store)
-{
-  void *buf;
-  size_t buf_len;
-  error_t err = gunzip (from, &buf, &buf_len);
-
-  if (! err)
-    {
-      err = store_buffer_create (buf, buf_len, flags, store);
-      if (err)
-	munmap (buf, buf_len);
-      else
-	store_free (from);
-    }
-
-  return err;
-}
-
-/* Open the gunzip 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_gunzip_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_gunzip_create (from, flags, store);
-      if (err)
-	store_free (from);
-    }
+  if (get_method (0) != 0)
+    /* Not a happy gzip file.  */
+    return EINVAL;
 
-  return err;
+  /* Matched gzip magic number.  Ready to unzip.
+     Set up the output stream and let 'er rip.  */
+  bytes_out = 0;
+  unzip (17, 23);		/* Arguments ignored.  */
+  return 0;
 }
 
-const struct store_class
-store_gunzip_class = { -1, "gunzip", open: store_gunzip_open };
+#define UNZIP		gunzip
+#include "unzipstore.c"