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/*
Unix SMB/CIFS implementation.
Samba utility functions
Copyright (C) Andrew Tridgell 1992-2001
Copyright (C) Simo Sorce 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/* these 2 tables define the unicode case handling. They are loaded
at startup either via mmap() or read() from the lib directory */
static void *upcase_table;
static void *lowcase_table;
/*******************************************************************
load the case handling tables
********************************************************************/
static void load_case_tables(void)
{
int i;
TALLOC_CTX *mem_ctx;
mem_ctx = talloc_init("load_case_tables");
if (!mem_ctx) {
smb_panic("No memory for case_tables");
}
upcase_table = map_file(lib_path(mem_ctx, "upcase.dat"), 0x20000);
lowcase_table = map_file(lib_path(mem_ctx, "lowcase.dat"), 0x20000);
talloc_destroy(mem_ctx);
/* we would like Samba to limp along even if these tables are
not available */
if (upcase_table == NULL) {
DEBUG(1,("creating lame upcase table\n"));
upcase_table = talloc_named_const(NULL, 0x20000, "upcase_table");
if (!upcase_table) {
smb_panic("No memory for upcase tables");
}
for (i=0;i<0x10000;i++) {
SSVAL(upcase_table, i*2, i);
}
for (i=0;i<256;i++) {
SSVAL(upcase_table, i*2, islower(i)?toupper(i):i);
}
}
if (lowcase_table == NULL) {
DEBUG(1,("creating lame lowcase table\n"));
lowcase_table = talloc_named_const(NULL, 0x20000, "lowcase_table");
if (!lowcase_table) {
smb_panic("No memory for lowcase tables");
}
for (i=0;i<0x10000;i++) {
SSVAL(lowcase_table, i*2, i);
}
for (i=0;i<256;i++) {
SSVAL(lowcase_table, i*2, isupper(i)?tolower(i):i);
}
}
}
/*******************************************************************
Convert a codepoint_t to upper case.
********************************************************************/
codepoint_t toupper_w(codepoint_t val)
{
if (val & 0xFFFF0000) {
return val;
}
if (val < 128) {
return toupper(val);
}
if (upcase_table == NULL) {
load_case_tables();
}
return SVAL(upcase_table, val*2);
}
/*******************************************************************
Convert a codepoint_t to lower case.
********************************************************************/
codepoint_t tolower_w(codepoint_t val)
{
if (val & 0xFFFF0000) {
return val;
}
if (val < 128) {
return tolower(val);
}
if (lowcase_table == NULL) {
load_case_tables();
}
return SVAL(lowcase_table, val*2);
}
/*******************************************************************
return the number of bytes occupied by a buffer in CH_UTF16 format
the result includes the null termination
********************************************************************/
size_t utf16_len(const void *buf)
{
size_t len;
for (len = 0; SVAL(buf,len); len += 2) ;
return len + 2;
}
/*******************************************************************
return the number of bytes occupied by a buffer in CH_UTF16 format
the result includes the null termination
limited by 'n' bytes
********************************************************************/
size_t utf16_len_n(const void *src, size_t n)
{
size_t len;
for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
if (len+2 <= n) {
len += 2;
}
return len;
}
size_t ucs2_align(const void *base_ptr, const void *p, int flags)
{
if (flags & (STR_NOALIGN|STR_ASCII))
return 0;
return PTR_DIFF(p, base_ptr) & 1;
}
/*
compare two codepoints case insensitively
*/
int codepoint_cmpi(codepoint_t c1, codepoint_t c2)
{
if (c1 == c2 ||
toupper_w(c1) == toupper_w(c2)) {
return 0;
}
return c1 - c2;
}
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