[iso] Set drive label according to the one from ISO

* required for Linux distros such as Arch Linux
* also added udf_get_logical_volume_id to libcdio and other fixes
* also prevents overwrite of ldlinux.sys from ISO
* closes #36

src/libcdio/cdio/udf.h

@@ -115,7 +115,7 @@ extern "C" {
   /**
    * Gets the Volume Identifier string, in 8bit unicode (latin-1)
    * psz_volid, place to put the string
-   * i_volid_size, size of the buffer volid points to
+   * i_volid, size of the buffer psz_volid points to
    * returns the size of buffer needed for all data
    */
   int udf_get_volume_id(udf_t *p_udf, /*out*/ char *psz_volid,  
@@ -125,14 +125,24 @@ extern "C" {
    * Gets the Volume Set Identifier, as a 128-byte dstring (not decoded)
    * WARNING This is not a null terminated string
    * volsetid, place to put the data
-   * volsetid_size, size of the buffer volsetid points to 
+   * i_volsetid, size of the buffer psz_volsetid points to 
    * the buffer should be >=128 bytes to store the whole volumesetidentifier
    * returns the size of the available volsetid information (128)
    * or 0 on error
    */
   int udf_get_volumeset_id(udf_t *p_udf, /*out*/ uint8_t *volsetid,
                            unsigned int i_volsetid);
-  
+
+  /**
+   * Gets the Logical Volume Identifier string, in 8bit unicode (latin-1)
+   * psz_logvolid, place to put the string
+   * i_logvolid, size of the buffer psz_logvolid points to
+   * returns the size of buffer needed for all data
+   * A call to udf_get_root() should have been issued before this call
+   */
+  int udf_get_logical_volume_id(udf_t *p_udf, /*out*/ char *psz_logvolid,  
+                        unsigned int i_logvolid);
+
   /*!
     Return a file pointer matching psz_name. 
   */

src/libcdio/driver/_cdio_stdio.c

@@ -39,6 +39,7 @@
 #ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
+#include <ctype.h>
 
 #include <cdio/logging.h>
 #include <cdio/util.h>
@@ -225,17 +226,34 @@ cdio_stdio_new(const char pathname[])
   cdio_stream_io_functions funcs = { NULL, NULL, NULL, NULL, NULL, NULL };
   _UserData *ud = NULL;
   struct CDIO_STAT statbuf;
-  
-  if (CDIO_STAT (pathname, &statbuf) == -1) 
+  char* pathdup;
+
+  if (pathname == NULL)
+    return NULL;
+
+  pathdup = strdup(pathname);
+  if (pathdup == NULL)
+    return NULL;
+
+#ifdef __MINGW32__
+  /* _stati64 requires using native Windows paths => convert "/c/..." to "c:/..." */
+  if ((strlen(pathdup) > 3) && (pathdup[0] == '/') && (pathdup[2] == '/') && (isalpha(pathdup[1])))
+    {
+      pathdup[0] = pathdup[1];
+      pathdup[1] = ':';
+    }
+#endif
+  if (CDIO_STAT (pathdup, &statbuf) == -1) 
     {
       cdio_warn ("could not retrieve file info for `%s': %s", 
-                 pathname, strerror (errno));
+                 pathdup, strerror (errno));
+      free(pathdup);
       return NULL;
     }
 
   ud = calloc (1, sizeof (_UserData));
 
-  ud->pathname = strdup(pathname);
+  ud->pathname = pathdup;
   ud->st_size  = statbuf.st_size; /* let's hope it doesn't change... */
 
   funcs.open   = _stdio_open;

src/libcdio/udf/udf_fs.c

@@ -427,7 +427,7 @@ udf_open (const char *psz_path)
 /**
  * Gets the Volume Identifier string, in 8bit unicode (latin-1)
  * psz_volid, place to put the string
- * i_volid_size, size of the buffer volid points to
+ * i_volid, size of the buffer psz_volid points to
  * returns the size of buffer needed for all data
  */
 int 
@@ -458,7 +458,7 @@ udf_get_volume_id(udf_t *p_udf, /*out*/ char *psz_volid,  unsigned int i_volid)
  * Gets the Volume Set Identifier, as a 128-byte dstring (not decoded)
  * WARNING This is not a null terminated string
  * volsetid, place to put the data
- * volsetid_size, size of the buffer volsetid points to 
+ * i_volsetid, size of the buffer psz_volsetid points to 
  * the buffer should be >=128 bytes to store the whole volumesetidentifier
  * returns the size of the available volsetid information (128)
  * or 0 on error
@@ -483,6 +483,31 @@ udf_get_volumeset_id(udf_t *p_udf, /*out*/ uint8_t *volsetid,
   return UDF_VOLSET_ID_SIZE;
 }
 
+/**
+ * Gets the Logical Volume Identifier string, in 8bit unicode (latin-1)
+ * psz_logvolid, place to put the string (should be at least 64 bytes)
+ * i_logvolid, size of the buffer psz_logvolid points to
+ * returns the size of buffer needed for all data
+ * A call to udf_get_root() should have been issued before this call
+ */
+int 
+udf_get_logical_volume_id(udf_t *p_udf, /*out*/ char *psz_logvolid,  unsigned int i_logvolid)
+{
+  uint8_t data[UDF_BLOCKSIZE];
+  logical_vol_desc_t *p_logvol = (logical_vol_desc_t *) &data;
+  int logvolid_len;
+
+  if (DRIVER_OP_SUCCESS != udf_read_sectors (p_udf, p_logvol, p_udf->lvd_lba, 1) ) 
+    return 0;
+
+  logvolid_len = (p_logvol->logvol_id[127]+1)/2;
+  if (i_logvolid > logvolid_len)
+    i_logvolid = logvolid_len;
+
+  unicode16_decode((uint8_t *) p_logvol->logvol_id, 2*i_logvolid, psz_logvolid);
+  return logvolid_len;
+}
+
 /*!
   Get the root in p_udf. If b_any_partition is false then
   the root must be in the given partition.