From: Sergey Poznyakoff <gray@gnu.org.ua>
Date: Mon, 17 Nov 2003 15:20:46 +0000 (+0000)
Subject: Support for star sparse format
X-Git-Url: https://git.dogcows.com/gitweb?p=chaz%2Ftar;a=commitdiff_plain;h=8d6e47cc7fcfb6781b82ba60b8eb823c7fdc7013

Support for star sparse format
---

diff --git a/src/sparse.c b/src/sparse.c
index 4f936dc..39be72d 100644
--- a/src/sparse.c
+++ b/src/sparse.c
@@ -215,11 +215,12 @@ sparse_scan_file (struct tar_sparse_file *file)
 }
 
 static struct tar_sparse_optab oldgnu_optab;
+static struct tar_sparse_optab star_optab;
 
 static bool
 sparse_select_optab (struct tar_sparse_file *file)
 {
-  switch (archive_format)
+  switch (current_format == DEFAULT_FORMAT ? archive_format : current_format)
     {
     case V7_FORMAT:
     case USTAR_FORMAT:
@@ -231,12 +232,15 @@ sparse_select_optab (struct tar_sparse_file *file)
       break;
 
     case POSIX_FORMAT:
-    case STAR_FORMAT:
-      /* FIXME: Add methods */
+      /* FIXME: Add method */
       return false;
 
-    default:
+    case STAR_FORMAT:
+      file->optab = &star_optab;
       break;
+	
+    default:
+      return false;
     }
   return true;
 }
@@ -640,3 +644,72 @@ static struct tar_sparse_optab oldgnu_optab = {
   sparse_dump_region,
   sparse_extract_region,
 };
+
+
+/* Star */
+
+/* Convert STAR format sparse data to internal representation
+   FIXME: Clubbers current_header! */
+static bool
+star_get_sparse_info (struct tar_sparse_file *file)
+{
+  size_t i;
+  union block *h = current_header;
+  int ext_p;
+  static enum oldgnu_add_status rc;
+  
+  /* FIXME: note this! st_size was initialized from the header
+     which actually contains archived size. The following fixes it */
+  file->stat_info->archive_file_size = file->stat_info->stat.st_size;
+  file->stat_info->stat.st_size =
+              OFF_FROM_HEADER (current_header->star_in_header.realsize);
+  
+  file->stat_info->sparse_map_size = 0;
+
+  if (h->star_in_header.prefix[0] == '\0'
+      && h->star_in_header.sp[0].offset[10] != '\0')
+    {
+      /* Old star format */
+      for (i = 0; i < SPARSES_IN_STAR_HEADER; i++)
+	{
+	  rc = oldgnu_add_sparse (file, &h->star_in_header.sp[i]);
+	  if (rc != add_ok)
+	    break;
+	}
+      ext_p = h->star_in_header.isextended;
+    }
+  else
+    ext_p = 1;
+
+  for (; rc == add_ok && ext_p; ext_p = h->star_ext_header.isextended)
+    {
+      h = find_next_block ();
+      if (!h)
+	{
+	  ERROR ((0, 0, _("Unexpected EOF in archive")));
+	  return false;
+	}
+      set_next_block_after (h);
+      for (i = 0; i < SPARSES_IN_STAR_EXT_HEADER && rc == add_ok; i++)
+	rc = oldgnu_add_sparse (file, &h->star_ext_header.sp[i]);
+    }
+
+  if (rc == add_fail)
+    {
+      ERROR ((0, 0, _("%s: invalid sparse archive member"),
+	      file->stat_info->orig_file_name));
+      return false;
+    }
+  return true;
+}
+
+
+static struct tar_sparse_optab star_optab = {
+  NULL,  /* No init function */
+  NULL,  /* No done function */
+  NULL,
+  star_get_sparse_info,
+  NULL,  /* No scan_block function */
+  NULL, /* No dump region function */ 
+  sparse_extract_region,
+};
diff --git a/src/tar.h b/src/tar.h
index c2a2004..449a938 100644
--- a/src/tar.h
+++ b/src/tar.h
@@ -42,29 +42,6 @@ struct posix_header
 				/* 500 */
 };
 
-struct star_header
-{				/* byte offset */
-  char name[100];		/*   0 */
-  char mode[8];			/* 100 */
-  char uid[8];			/* 108 */
-  char gid[8];			/* 116 */
-  char size[12];		/* 124 */
-  char mtime[12];		/* 136 */
-  char chksum[8];		/* 148 */
-  char typeflag;		/* 156 */
-  char linkname[100];		/* 157 */
-  char magic[6];		/* 257 */
-  char version[2];		/* 263 */
-  char uname[32];		/* 265 */
-  char gname[32];		/* 297 */
-  char devmajor[8];		/* 329 */
-  char devminor[8];		/* 337 */
-  char prefix[131];		/* 345 */
-  char atime[12];               /* 476 */
-  char ctime[12];               /* 488 */
-                                /* 500 */
-};
-
 #define TMAGIC   "ustar"	/* ustar and a null */
 #define TMAGLEN  6
 #define TVERSION "00"		/* 00 and no null */
@@ -212,6 +189,57 @@ struct oldgnu_header
 /* This file is a tape/volume header.  Ignore it on extraction.  */
 #define GNUTYPE_VOLHDR 'V'
 
+
+/* Jörg Schilling star header */
+
+struct star_header
+{				/* byte offset */
+  char name[100];		/*   0 */
+  char mode[8];			/* 100 */
+  char uid[8];			/* 108 */
+  char gid[8];			/* 116 */
+  char size[12];		/* 124 */
+  char mtime[12];		/* 136 */
+  char chksum[8];		/* 148 */
+  char typeflag;		/* 156 */
+  char linkname[100];		/* 157 */
+  char magic[6];		/* 257 */
+  char version[2];		/* 263 */
+  char uname[32];		/* 265 */
+  char gname[32];		/* 297 */
+  char devmajor[8];		/* 329 */
+  char devminor[8];		/* 337 */
+  char prefix[131];		/* 345 */
+  char atime[12];               /* 476 */
+  char ctime[12];               /* 488 */
+                                /* 500 */
+};
+
+#define SPARSES_IN_STAR_HEADER      4
+#define SPARSES_IN_STAR_EXT_HEADER  21
+
+struct star_in_header {
+  char fill[345];       /*   0  Everything that is before t_prefix */
+  char prefix[1];       /* 345  t_name prefix */
+  char fill2;           /* 346  */
+  char fill3[8];        /* 347  */
+  char isextended;      /* 355  */
+  struct sparse sp[SPARSES_IN_STAR_HEADER]; /* 356  */
+  char realsize[12];    /* 452  Actual size of the file */
+  char offset[12];      /* 464  Offset of multivolume contents */
+  char atime[12];       /* 476  */
+  char ctime[12];       /* 488  */
+  char mfill[8];        /* 500  */
+  char xmagic[4];       /* 508  "tar" */
+};
+
+struct star_ext_header {
+  struct sparse sp[SPARSES_IN_STAR_EXT_HEADER];
+  char isextended;
+};
+
+
+
 /* tar Header Block, overall structure.  */
 
 /* tar files are made in basic blocks of this size.  */
@@ -267,6 +295,8 @@ union block
   struct star_header star_header;
   struct oldgnu_header oldgnu_header;
   struct sparse_header sparse_header;
+  struct star_in_header star_in_header;
+  struct star_ext_header star_ext_header;
 };
 
 /* End of Format description.  */