src/install/acquire/cabinet.c

   1 /* $Id$
   2  * cabextract interface for acquiration installation utility
   3  * Copyright (C) 2003 Jan Kratochvil <project-captive@jankratochvil.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include "cabinet.h"    /* self */
  23 #include <glib/gmessages.h>
  24 #include <libgnomevfs/gnome-vfs-file-size.h>
  25 #include <libgnomevfs/gnome-vfs-ops.h>
  26 #include "cabextract/cabextract.h"
  27 #include "captivemodid.h"
  28 #include "moduriload.h"
  29 #include <sys/mman.h>
  30 #include <unistd.h>
  31
  32 #include <captive/macros.h>
  33
  34
  35 void acquire_cabinet_seek(struct acquire_cabinet *acquire_cabinet,GnomeVFSFileOffset offset)
  36 {
  37         g_return_if_fail(acquire_cabinet!=NULL);
  38
  39         acquire_cabinet->offset=offset;
  40 }
  41
  42 void acquire_cabinet_seek_skip(struct acquire_cabinet *acquire_cabinet,GnomeVFSFileOffset offset)
  43 {
  44         g_return_if_fail(acquire_cabinet!=NULL);
  45
  46         acquire_cabinet->offset+=offset;
  47 }
  48
  49 GnomeVFSFileOffset acquire_cabinet_tell(struct acquire_cabinet *acquire_cabinet)
  50 {
  51         g_return_val_if_fail(acquire_cabinet!=NULL,GNOME_VFS_ERROR_BAD_PARAMETERS);
  52
  53         return acquire_cabinet->offset;
  54 }
  55
  56 #define ACQUIRE_CABINET_BYTE_CACHED(acquire_cabinet,pos)     (!(acquire_cabinet)->base_cached \
  57                                                            || (acquire_cabinet)->base_cached[(pos)/8] &  1<<((pos)&7))
  58 #define ACQUIRE_CABINET_SET_BYTE_CACHED(acquire_cabinet,pos) ((acquire_cabinet)->base_cached[(pos)/8] |= 1<<((pos)&7))
  59
  60 GnomeVFSResult acquire_cabinet_read
  61                 (struct acquire_cabinet *acquire_cabinet,gpointer buffer,GnomeVFSFileSize bytes,GnomeVFSFileSize *bytes_read)
  62 {
  63 GnomeVFSFileOffset offset_start,offset_end,read_behind;
  64 GnomeVFSResult errvfsresult;
  65 GnomeVFSFileSize bytes_read_now;
  66
  67         g_return_val_if_fail(acquire_cabinet!=NULL,GNOME_VFS_ERROR_BAD_PARAMETERS);
  68         g_return_val_if_fail(buffer!=NULL || bytes==0,GNOME_VFS_ERROR_BAD_PARAMETERS);
  69
  70         bytes=MAX(0,MIN(bytes,acquire_cabinet->size-acquire_cabinet->offset));
  71         if (!bytes)
  72                 return GNOME_VFS_ERROR_EOF;
  73
  74         *bytes_read=0;
  75         while (bytes) {
  76                 read_behind =acquire_cabinet->offset+bytes;
  77
  78                 /* GnomeVFS block transfer: */
  79                 offset_start=acquire_cabinet->offset;
  80                 offset_end  =acquire_cabinet->offset;
  81                 while (offset_end<read_behind && !ACQUIRE_CABINET_BYTE_CACHED(acquire_cabinet,offset_end))
  82                         offset_end++;
  83                 if (offset_end>offset_start) {
  84                         if (GNOME_VFS_OK!=(errvfsresult=gnome_vfs_seek(acquire_cabinet->handle,GNOME_VFS_SEEK_START,offset_start)))
  85                                 return errvfsresult;
  86                         errvfsresult=gnome_vfs_read(acquire_cabinet->handle,
  87                                         acquire_cabinet->base+offset_start,offset_end-offset_start,&bytes_read_now);
  88                         if (errvfsresult!=GNOME_VFS_OK)
  89                                 return errvfsresult;
  90                         g_assert(bytes_read_now>0);
  91                         while (bytes_read_now) {
  92                                 ACQUIRE_CABINET_SET_BYTE_CACHED(acquire_cabinet,offset_start);
  93                                 offset_start++;
  94                                 bytes_read_now--;
  95                                 }
  96                         }
  97
  98                 /* Memory block transfer: */
  99                 offset_start=acquire_cabinet->offset;
 100                 offset_end  =acquire_cabinet->offset;
 101                 while (offset_end<read_behind && ACQUIRE_CABINET_BYTE_CACHED(acquire_cabinet,offset_end))
 102                         offset_end++;
 103                 memcpy(buffer,acquire_cabinet->base+offset_start,offset_end-offset_start);
 104                 if (bytes_read)
 105                         *bytes_read+=offset_end-offset_start;
 106                 buffer+=offset_end-offset_start;
 107                 bytes-=offset_end-offset_start;
 108                 acquire_cabinet->offset=offset_end;
 109                 }
 110
 111         return GNOME_VFS_OK;
 112 }
 113
 114 static void acquire_cabinet_set_uri(struct acquire_cabinet *acquire_cabinet,GnomeVFSURI *uri)
 115 {
 116 GnomeVFSURI *uri_cabextract;
 117
 118         g_return_if_fail(acquire_cabinet!=NULL);
 119         g_return_if_fail(uri!=NULL);
 120
 121         /* FIXME: HACK: Use proper 'cabextract' scheme after it gets implemented.
 122          * GnomeVFS will return NULL on gnome_vfs_uri_new() with scheme not available.
 123          */
 124         uri_cabextract=gnome_vfs_uri_new("file://");
 125         g_assert(uri_cabextract->parent==NULL);
 126         /* Do not: g_assert(!strcmp(uri_cabextract->method_string,"file"));
 127          *         uri_cabextract->method_string=g_strdup("cabextract");
 128          * as it will just strip such anchor. FIXME: Why?
 129          */
 130
 131         uri_cabextract->parent=gnome_vfs_uri_dup(uri);
 132
 133         acquire_cabinet->uri=uri_cabextract;
 134         acquire_cabinet->filename=gnome_vfs_uri_to_string(acquire_cabinet->uri,GNOME_VFS_URI_HIDE_PASSWORD);
 135 }
 136
 137 struct acquire_cabinet *acquire_cabinet_new_from_memory(gconstpointer file_base,size_t file_length,GnomeVFSURI *uri)
 138 {
 139 struct acquire_cabinet *r;
 140
 141         g_return_val_if_fail(file_base!=NULL,NULL);
 142         g_return_val_if_fail(uri!=NULL,NULL);
 143
 144         captive_new(r);
 145         r->base=(/* de-const */ gpointer)file_base;
 146         r->base_cached=NULL;
 147         r->offset=0;
 148         r->handle=NULL;
 149         r->size=file_length;
 150         acquire_cabinet_set_uri(r,uri);
 151
 152         return r;
 153 }
 154
 155 struct acquire_cabinet *acquire_cabinet_new_from_handle(GnomeVFSHandle *handle,GnomeVFSFileInfo *file_info,GnomeVFSURI *uri)
 156 {
 157 struct acquire_cabinet *r;
 158
 159         g_return_val_if_fail(handle!=NULL,NULL);
 160         g_return_val_if_fail(file_info!=NULL,NULL);
 161         g_return_val_if_fail(uri!=NULL,NULL);
 162
 163         captive_new(r);
 164         if (MAP_FAILED==(r->base=mmap(
 165                         NULL,CAPTIVE_ROUND_UP64(file_info->size,getpagesize()),PROT_READ|PROT_WRITE,MAP_ANONYMOUS|MAP_PRIVATE,-1,0))) {
 166                 g_free(r);
 167                 g_return_val_if_reached(NULL);
 168                 }
 169         captive_new0n(r->base_cached,CAPTIVE_ROUND_UP64(file_info->size,8)/8);
 170         r->offset=0;
 171         r->handle=handle;
 172         r->size=file_info->size;
 173         acquire_cabinet_set_uri(r,uri);
 174
 175         return r;
 176 }
 177
 178 void acquire_cabinet_free(struct acquire_cabinet *acquire_cabinet)
 179 {
 180         g_return_if_fail(acquire_cabinet!=NULL);
 181
 182         if (acquire_cabinet->base_cached) {
 183                 munmap(acquire_cabinet->base,CAPTIVE_ROUND_UP64(acquire_cabinet->size,getpagesize()));  /* errors ignored */
 184                 g_free(acquire_cabinet->base_cached);
 185                 }
 186         g_free((/* de-const */ gchar *)acquire_cabinet->filename);
 187         gnome_vfs_uri_unref(acquire_cabinet->uri);
 188         g_free(acquire_cabinet);
 189 }
 190
 191 static struct file *file_write_fi_assertion;
 192 static GByteArray *file_write_bytearray;
 193
 194 int file_write(struct file *fi, UBYTE *buf, size_t length)
 195 {
 196         g_return_val_if_fail(fi!=NULL,0);
 197         g_return_val_if_fail(buf!=NULL || length==0,0);
 198
 199         g_return_val_if_fail(fi==file_write_fi_assertion,0);
 200         g_return_val_if_fail(file_write_bytearray!=NULL,0);
 201
 202         g_byte_array_append(file_write_bytearray,buf,length);
 203
 204         return 1;       /* success */
 205 }
 206
 207 void acquire_cabinet_load(struct acquire_cabinet *acquire_cabinet)
 208 {
 209 struct cabinet *basecab;
 210 struct file *filelist,*fi;
 211
 212         g_return_if_fail(acquire_cabinet!=NULL);
 213
 214         basecab=find_cabs_in_file(acquire_cabinet);
 215         if (!basecab)
 216                 return;
 217         if (basecab->next)
 218                 return;
 219         if (basecab->prevcab || basecab->nextcab)
 220                 return;
 221
 222         filelist=process_files(basecab);
 223
 224         for (fi=filelist;fi;fi=fi->next) {
 225 gpointer file_buffer;
 226 GnomeVFSURI *uri_fi;
 227
 228                 if (!captivemodid_module_length_is_valid(fi->length))
 229                         continue;
 230
 231                 file_write_fi_assertion=fi;
 232                 file_write_bytearray=g_byte_array_new();
 233                 extract_file(fi,
 234                                 0,      /* lower; ignored now */
 235                                 FALSE,  /* fix */
 236                                 NULL);  /* dir; ignored now */
 237                 if (fi->length!=file_write_bytearray->len) {
 238                         g_byte_array_free(file_write_bytearray,
 239                                         TRUE);  /* free_segment */
 240                         continue;
 241                         }
 242                 file_buffer=g_byte_array_free(file_write_bytearray,
 243                                 FALSE); /* free_segment */
 244                 uri_fi=gnome_vfs_uri_append_file_name(acquire_cabinet->uri,fi->filename);
 245                 mod_uri_load_file_from_memory(file_buffer,fi->length,uri_fi);
 246                 gnome_vfs_uri_unref(uri_fi);
 247                 g_free(file_buffer);
 248     }
 249 }