Makefile: New program and support for dynamic codepage loading.

charset.c: Dynamic codepage loading code.
charset.h: Defines for file format.
proto.h:   Updated.
Jeremy (jallison@whistle.com)
(This used to be commit 550e98f2d49a101654b3abde278a7f7edf347ed8)

1 files changed, 159 insertions, 137 deletions

diff --git a/source3/lib/charset.c b/source3/lib/charset.c
index c1945cb1ef..4869e09fec 100644
--- a/source3/lib/charset.c
+++ b/source3/lib/charset.c
@@ -28,6 +28,7 @@ extern int DEBUGLEVEL;
  * Codepage definitions.
  */
 
+#if !defined(KANJI)
 /* lower->upper mapping for IBM Code Page 850 - MS-DOS Latin 1 */
 unsigned char cp_850[][4] = {
 /* dec col/row oct hex  description */
@@ -95,120 +96,13 @@ unsigned char cp_850[][4] = {
   {0x9C,0,0,0},     /* Pound        */
   {0,0,0,0}
 };
- 
-/* lower->upper mapping for IBM Code Page 852 - MS-DOS Latin 2 */
-/* Donated by Leos Bitto <bitto@altec.cz> */
-unsigned char cp_852[][4] = {
-{0x81,0x9A,1,1},
-{0x82,0x90,1,1},
-{0x83,0xB6,1,1},
-{0x84,0x8E,1,1},
-{0x85,0xDE,1,1},
-{0x86,0x8F,1,1},
-{0x87,0x80,1,1},
-{0x88,0x9D,1,1},
-{0x89,0xD3,1,1},
-{0x8B,0x8A,1,1},
-{0x8C,0xD7,1,1},
-{0x92,0x91,1,1},
-{0x93,0xE2,1,1},
-{0x94,0x99,1,1},
-{0x96,0x95,1,1},
-{0x98,0x97,1,1},
-{0x9C,0x9B,1,1},
-{0x9F,0xAC,1,1},
-{0xA0,0xB5,1,1},
-{0xA1,0xD6,1,1},
-{0xA2,0xE0,1,1},
-{0xA3,0xE9,1,1},
-{0xA5,0xA4,1,1},
-{0xA7,0xA6,1,1},
-{0xA9,0xA8,1,1},
-{0xAB,0x8D,1,1},
-{0xAD,0xB8,1,1},
-{0xBE,0xBD,1,1},
-{0xC7,0xC6,1,1},
-{0xD0,0xD1,1,1},
-{0xD4,0xD2,1,1},
-{0xD8,0xB7,1,1},
-{0xE4,0xE3,1,1},
-{0xE5,0xD5,1,1},
-{0xE7,0xE6,1,1},
-{0xEA,0xE8,1,1},
-{0xEC,0xED,1,1},
-{0xEE,0xDD,1,1},
-{0xFB,0xEB,1,1},
-{0xFD,0xFC,1,1},
-{0,0,0,0}
-};
-
-/* lower->upper mapping for IBM Code Page 437 - MS-DOS Latin US */
-unsigned char cp_437[][4] = {
-/* 135  08/07  207  87  c cedilla */
-/* 128  08/00  200  80  C cedilla */	{0x87,0x80,1,1},
-/* 129  08/01  201  81  u diaeresis */
-/* 154  09/10  232  9A  U diaeresis */	{0x81,0x9A,1,1},
-/* 130  08/02  202  82  e acute */
-/* 144  09/00  220  90  E acute */	{0x82,0x90,1,1},
-/* 131  08/03  203  83  a circumflex */ {0x83,0x41,1,0},
-/* 132  08/04  204  84  a diaeresis */
-/* 142  08/14  216  8E  A diaeresis */	{0x84,0x8E,1,1},
-/* 133  08/05  205  85  a grave */      {0x85,0x41,1,0},
-/* 134  08/06  206  86  a ring */       {0x86,0x8F,1,1},
-/* 136  08/08  210  88  e circumflex */ {0x88,0x45,1,0},
-/* 137  08/09  211  89  e diaeresis */  {0x89,0x45,1,0},
-/* 138  08/10  212  8A  e grave */      {0x8A,0x45,1,0},
-/* 139  08/11  213  8B  i diaeresis */  {0x8B,0x49,1,0},
-/* 140  08/12  214  8C  i circumflex */ {0x8C,0x49,1,0},
-/* 141  08/13  215  8D  i grave */      {0x8D,0x49,1,0},
-/* 145  09/01  221  91  ae diphthong */
-/* 146  09/02  222  92  AE diphthong */	{0x91,0x92,1,1},
-/* 147  09/03  223  93  o circumflex */ {0x93,0x4F,1,0},
-/* 148  09/04  224  94  o diaeresis */
-/* 153  09/09  231  99  O diaeresis */	{0x94,0x99,1,1},
-/* 149  09/05  225  95  o grave */      {0x95,0x4F,1,0},
-/* 150  09/06  226  96  u circumflex */ {0x96,0x55,1,0},
-/* 151  09/07  227  97  u grave */      {0x97,0x55,1,0},
-/* 152  ??/??  201  98  u diaeresis */
-  {0x9B,0,0,0},     /* Cent         */
-  {0x9C,0,0,0},     /* Pound        */
-  {0x9D,0,0,0},     /* Yen          */
-/* 160  10/00  240  A0  a acute */      {0xA0,0x41,1,0},
-/* 161  10/01  241  A1  i acute */      {0xA1,0x49,1,0},
-/* 162  10/02  242  A2  o acute */      {0xA2,0x4F,1,0},
-/* 163  10/03  243  A3  u acute */      {0xA3,0x55,1,0},
-/* 164  10/04  244  A4  n tilde */
-/* 165  10/05  245  A5  N tilde */	{0xA4,0xA5,1,1},
-/* Punctuation... */
-  {0xA8,0,0,0}, 
-  {0xAD,0,0,0},
-  {0xAE,0,0,0},
-  {0xAF,0,0,0},
-/* Greek character set */
-  {0xE0,0,0,0},
-  {0xE1,0,0,0},
-  {0xE2,0,0,0},
-  {0xE3,0,0,0},
-  {0xE4,0,0,0},
-  {0xE5,0,0,0},
-  {0xE6,0,0,0},
-  {0xE7,0,0,0},
-  {0xE8,0,0,0},
-  {0xE9,0,0,0},
-  {0xEA,0,0,0},
-  {0xEB,0,0,0},
-  {0xEC,0,0,0},
-  {0xED,0,0,0},
-  {0xEE,0,0,0},
-  {0xEF,0,0,0},
-  {0,0,0,0}
-};
-
+#else /* KANJI */ 
 /* lower->upper mapping for IBM Code Page 932 - MS-DOS Japanese SJIS */
 unsigned char cp_932[][4] = {
   {0,0,0,0}
 };
- 
+#endif /* KANJI */
+
 char xx_dos_char_map[256];
 char xx_upper_char_map[256];
 char xx_lower_char_map[256];
@@ -240,9 +134,9 @@ static void add_dos_char(int lower, BOOL map_lower_to_upper,
   if (upper) dos_char_map[upper] = 1;
   if (lower && upper) {
     if(map_upper_to_lower)
-      lower_char_map[upper] = (char)lower;
+    lower_char_map[upper] = (char)lower;
     if(map_lower_to_upper)
-      upper_char_map[lower] = (char)upper;
+    upper_char_map[lower] = (char)upper;
   }
 }
 
@@ -277,12 +171,152 @@ void charset_initialise()
 }
 
 /****************************************************************************
+load the client codepage.
+****************************************************************************/
+
+typedef unsigned char (*codepage_p)[4];
+
+static codepage_p load_client_codepage( int client_codepage )
+{
+  pstring codepage_file_name;
+  unsigned char buf[8];
+  FILE *fp = NULL;
+  unsigned int size;
+  codepage_p cp_p = NULL;
+  struct stat st;
+
+  DEBUG(5, ("load_client_codepage: loading codepage %d.\n", client_codepage));
+
+  if(strlen(CODEPAGEDIR) + 14 > sizeof(codepage_file_name))
+  {
+    DEBUG(0,("load_client_codepage: filename too long to load\n"));
+    return NULL;
+  }
+
+  strcpy(codepage_file_name, CODEPAGEDIR);
+  strcat(codepage_file_name, "/");
+  strcat(codepage_file_name, "codepage.");
+  sprintf( &codepage_file_name[strlen(codepage_file_name)], "%03d",
+           client_codepage);
+
+  if(!file_exist(codepage_file_name,&st))
+  {
+    DEBUG(0,("load_client_codepage: filename %s does not exist.\n",
+              codepage_file_name));
+    return NULL;
+  }
+
+  /* Check if it is at least big enough to hold the required
+     data. Should be 2 byte version, 2 byte codepage, 4 byte length, 
+     plus zero or more bytes of data. Note that the data cannot be more
+     than 512 bytes - giving a max size of 520.
+   */
+  size = (unsigned int)st.st_size;
+
+  if( size < CODEPAGE_HEADER_SIZE || size > (CODEPAGE_HEADER_SIZE + 256))
+  {
+    DEBUG(0,("load_client_codepage: file %s is an incorrect size for a \
+code page file.\n", codepage_file_name));
+    return NULL;
+  }
+
+  /* Read the first 8 bytes of the codepage file - check
+     the version number and code page number. All the data
+     is held in little endian format.
+   */
+
+  if((fp = fopen( codepage_file_name, "r")) == NULL)
+  {
+    DEBUG(0,("load_client_codepage: cannot open file %s. Error was %s\n",
+              codepage_file_name, strerror(errno)));
+    return NULL;
+  }
+
+  if(fread( buf, 1, CODEPAGE_HEADER_SIZE, fp)!=CODEPAGE_HEADER_SIZE)
+  {
+    DEBUG(0,("load_client_codepage: cannot read header from file %s. Error was %s\n",
+              codepage_file_name, strerror(errno)));
+    goto clean_and_exit;
+  }
+
+  /* Check the version value */
+  if(SVAL(buf,CODEPAGE_VERSION_OFFSET) != CODEPAGE_FILE_VERSION_ID)
+  {
+    DEBUG(0,("load_client_codepage: filename %s has incorrect version id. \
+Needed %hu, got %hu.\n", 
+          codepage_file_name, (uint16)CODEPAGE_FILE_VERSION_ID, 
+          SVAL(buf,CODEPAGE_VERSION_OFFSET)));
+    goto clean_and_exit;
+  }
+
+  /* Check the codepage matches */
+  if(SVAL(buf,CODEPAGE_CLIENT_CODEPAGE_OFFSET) != (uint16)client_codepage)
+  {
+    DEBUG(0,("load_client_codepage: filename %s has incorrect codepage. \
+Needed %hu, got %hu.\n", 
+           codepage_file_name, (uint16)client_codepage, 
+           SVAL(buf,CODEPAGE_CLIENT_CODEPAGE_OFFSET)));
+    goto clean_and_exit;
+  }
+
+  /* Check the length is correct. */
+  if(IVAL(buf,CODEPAGE_LENGTH_OFFSET) != 
+                 (unsigned int)(size - CODEPAGE_HEADER_SIZE))
+  {
+    DEBUG(0,("load_client_codepage: filename %s has incorrect size headers. \
+Needed %u, got %u.\n", codepage_file_name, size - CODEPAGE_HEADER_SIZE, 
+               IVAL(buf,CODEPAGE_LENGTH_OFFSET)));
+    goto clean_and_exit;
+  }
+
+  size -= CODEPAGE_HEADER_SIZE; /* Remove header */
+
+  /* Make sure the size is a multiple of 4. */
+  if((size % 4 ) != 0)
+  {
+    DEBUG(0,("load_client_codepage: filename %s has a codepage size not a \
+multiple of 4.\n", codepage_file_name));
+    goto clean_and_exit;
+  }
+
+  /* Allocate space for the code page file and read it all in. */
+  if((cp_p = (codepage_p)malloc( size  + 4 )) == NULL)
+  {
+    DEBUG(0,("load_client_codepage: malloc fail.\n"));
+    goto clean_and_exit;
+  }
+
+  if(fread( (char *)cp_p, 1, size, fp)!=size)
+  {
+    DEBUG(0,("load_client_codepage: read fail on file %s. Error was %s.\n",
+              codepage_file_name, strerror(errno)));
+    goto clean_and_exit;
+  }
+
+  /* Ensure array is correctly terminated. */
+  memset(((char *)cp_p) + size, '\0', 4);
+
+  fclose(fp);
+  return cp_p;
+
+clean_and_exit:
+
+  /* pseudo destructor :-) */
+
+  if(fp != NULL)
+    fclose(fp);
+  if(cp_p)
+    free((char *)cp_p);
+  return NULL;
+}
+
+/****************************************************************************
 initialise the client codepage.
 ****************************************************************************/
 void codepage_initialise(int client_codepage)
 {
   int i;
-  unsigned char (*cp)[4] = NULL;
+  codepage_p cp = NULL;
   static BOOL done = False;
 
   if(done == True) 
@@ -298,38 +332,26 @@ void codepage_initialise(int client_codepage)
   /*
    * Known client codepages - these can be added to.
    */
-  switch(client_codepage)
+  cp = load_client_codepage( client_codepage );
+
+  if(cp == NULL)
   {
-    case 850:
-      cp = cp_850;
-      break;
-    case 852:
-      cp = cp_852;
-      break;
-    case 437:
-      cp = cp_437;
-      break;
-    case 932:
-      cp = cp_932;
-      break;
-    default:
 #ifdef KANJI
-      /* Use default codepage - currently 932 */
-      DEBUG(6,("codepage_initialise: Using default client codepage %d\n", 
-               932));
-      cp = cp_932;
+    DEBUG(6,("codepage_initialise: loading dynamic codepage file %s/codepage.%d \
+for code page %d failed. Using default client codepage 932\n", 
+             CODEPAGEDIR, client_codepage, client_codepage));
+    cp = cp_932;
 #else /* KANJI */
-      /* Use default codepage - currently 850 */
-      DEBUG(6,("codepage_initialise: Using default client codepage %d\n", 
-               850));
-      cp = cp_850;
+    DEBUG(6,("codepage_initialise: loading dynamic codepage file %s/codepage.%d \
+for code page %d failed. Using default client codepage 850\n", 
+             CODEPAGEDIR, client_codepage, client_codepage));
+    cp = cp_850;
 #endif /* KANJI */
-      break;
   }
 
   if(cp)
   {
-    for(i = 0; (cp[i][0] != '\0') && (cp[i][1] != '\0'); i++)
+    for(i = 0; !((cp[i][0] == '\0') && (cp[i][1] == '\0')); i++)
       add_dos_char(cp[i][0], (BOOL)cp[i][2], cp[i][1], (BOOL)cp[i][3]);
   }