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r17723 Saturday 8th September, 2012 at 11:59:58 UTC by smf
(MESS) support for writing to compressed hard drives using diff files. [smf]
[src/emu/imagedev]harddriv.c harddriv.h
[src/lib/util]chd.c

trunk/src/lib/util/chd.c
r17722r17723
15891589   m_compression[2] = be_read(&rawheader[24], 4);
15901590   m_compression[3] = be_read(&rawheader[28], 4);
15911591
1592   if (compressed() && m_allow_writes)
1593      throw CHDERR_FILE_NOT_WRITEABLE;
1594
15921595   // describe the format
15931596   m_mapoffset_offset = 40;
15941597   m_metaoffset_offset = 48;
trunk/src/emu/imagedev/harddriv.c
r17722r17723
22
33    Code to interface the image code with harddisk core.
44
5    We do not support diff files as it will involve some changes in
6    the image code.  Additionally, the need for diff files comes
7    from MAME's need for "canonical" hard drive images.
8
95    Raphael Nabet 2003
106
117    Update: 23-Feb-2004 - Unlike floppy disks, for which we support
r17722r17723
1612*********************************************************************/
1713
1814#include "emu.h"
15#include "emuopts.h"
1916#include "harddisk.h"
2017#include "harddriv.h"
2118
r17722r17723
140137
141138   /* create the CHD file */
142139   chd_codec_type compression[4] = { CHD_CODEC_NONE };
143   err = m_self_chd.create(*image_core_file(), (UINT64)totalsectors * (UINT64)sectorsize, hunksize, sectorsize, compression);
140   err = m_origchd.create(*image_core_file(), (UINT64)totalsectors * (UINT64)sectorsize, hunksize, sectorsize, compression);
144141   if (err != CHDERR_NONE)
145142      goto error;
146143
147144   /* if we created the image and hence, have metadata to set, set the metadata */
148145   metadata.format(HARD_DISK_METADATA_FORMAT, cylinders, heads, sectors, sectorsize);
149   err = m_self_chd.write_metadata(HARD_DISK_METADATA_TAG, 0, metadata);
150   m_self_chd.close();
146   err = m_origchd.write_metadata(HARD_DISK_METADATA_TAG, 0, metadata);
147   m_origchd.close();
151148
152149   if (err != CHDERR_NONE)
153150      goto error;
r17722r17723
172169      m_hard_disk_handle = NULL;
173170   }
174171
175   if (m_chd != NULL)
172   m_origchd.close();
173   m_diffchd.close();
174   m_chd = NULL;
175}
176
177/*-------------------------------------------------
178    open_disk_diff - open a DISK diff file
179-------------------------------------------------*/
180
181static chd_error open_disk_diff(emu_options &options, const char *name, chd_file &source, chd_file &diff_chd)
182{
183   astring fname(name, ".dif");
184
185   /* try to open the diff */
186   //printf("Opening differencing image file: %s\n", fname.cstr());
187   emu_file diff_file(options.diff_directory(), OPEN_FLAG_READ | OPEN_FLAG_WRITE);
188   file_error filerr = diff_file.open(fname);
189   if (filerr == FILERR_NONE)
176190   {
177      if (m_self_chd.opened())
178         m_self_chd.close();
179      m_chd = NULL;
191      astring fullpath(diff_file.fullpath());
192      diff_file.close();
193
194      //printf("Opening differencing image file: %s\n", fullpath.cstr());
195      return diff_chd.open(fullpath, true, &source);
180196   }
197
198   /* didn't work; try creating it instead */
199   //printf("Creating differencing image: %s\n", fname.cstr());
200   diff_file.set_openflags(OPEN_FLAG_READ | OPEN_FLAG_WRITE | OPEN_FLAG_CREATE | OPEN_FLAG_CREATE_PATHS);
201   filerr = diff_file.open(fname);
202   if (filerr == FILERR_NONE)
203   {
204      astring fullpath(diff_file.fullpath());
205      diff_file.close();
206
207      /* create the CHD */
208      //printf("Creating differencing image file: %s\n", fullpath.cstr());
209      chd_codec_type compression[4] = { CHD_CODEC_NONE };
210      chd_error err = diff_chd.create(fullpath, source.logical_bytes(), source.hunk_bytes(), compression, source);
211      if (err != CHDERR_NONE)
212         return err;
213
214      return diff_chd.clone_all_metadata(source);
215   }
216
217   return CHDERR_FILE_NOT_FOUND;
181218}
182219
183220int harddisk_image_device::internal_load_hd()
184221{
185   chd_error      err = (chd_error)0;
186   int            is_writeable;
187222   astring tempstring;
223   chd_error err = CHDERR_NONE;
188224
225   m_chd = NULL;
226
189227   /* open the CHD file */
190228   if (software_entry() != NULL)
191229   {
192230      m_chd  = get_disk_handle(device().machine(), device().subtag(tempstring,"harddriv"));
193   } else {
194      do
231   }
232   else
233   {
234      err = m_origchd.open(*image_core_file(), true);
235      if (err == CHDERR_NONE)
195236      {
196         is_writeable = !is_readonly();
197         err = m_self_chd.open(*image_core_file(), is_writeable);
237         m_chd = &m_origchd;
238      }
239      else if (err == CHDERR_FILE_NOT_WRITEABLE)
240      {
241         err = m_origchd.open(*image_core_file(), false);
198242         if (err == CHDERR_NONE)
199            m_chd = &m_self_chd;
200
201         /* special case; if we get CHDERR_FILE_NOT_WRITEABLE, make the
202             * image read only and repeat */
203         if (err == CHDERR_FILE_NOT_WRITEABLE)
204            make_readonly();
243         {
244            err = open_disk_diff(device().machine().options(), basename_noext(), m_origchd, m_diffchd);
245            if (err == CHDERR_NONE)
246            {
247               m_chd = &m_diffchd;
248            }
249         }
205250      }
206      while(!m_chd && is_writeable && (err == CHDERR_FILE_NOT_WRITEABLE));
207251   }
208   if (!m_chd)
209      goto done;
210252
211   /* open the hard disk file */
212   m_hard_disk_handle = hard_disk_open(m_chd);
213   if (!m_hard_disk_handle)
214      goto done;
215
216done:
217   if (err)
253   if (m_chd != NULL)
218254   {
219      /* if we had an error, close out the CHD */
220      if (m_chd != NULL)
221      {
222         if (m_self_chd.opened())
223            m_self_chd.close();
224         m_chd = NULL;
225      }
226      seterror(IMAGE_ERROR_UNSPECIFIED, chd_file::error_string(err));
255      /* open the hard disk file */
256      m_hard_disk_handle = hard_disk_open(m_chd);
257      if (m_hard_disk_handle != NULL)
258         return IMAGE_INIT_PASS;
227259   }
228   return err ? IMAGE_INIT_FAIL : IMAGE_INIT_PASS;
260
261   /* if we had an error, close out the CHD */
262   m_origchd.close();
263   m_diffchd.close();
264   m_chd = NULL;
265   seterror(IMAGE_ERROR_UNSPECIFIED, chd_file::error_string(err));
266
267   return IMAGE_INIT_FAIL;
229268}
230269
231270/*************************************
trunk/src/emu/imagedev/harddriv.h
r17722r17723
6767   int internal_load_hd();
6868
6969   chd_file      *m_chd;
70   chd_file      m_self_chd;
70   chd_file      m_origchd;            /* handle to the original CHD */
71   chd_file      m_diffchd;            /* handle to the diff CHD */
7172   hard_disk_file   *m_hard_disk_handle;
7273
7374   image_device_format m_format;

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