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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"
#include "system/iconv.h"
/**
* @file
* @brief Unicode string manipulation
*/
/* 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)
{
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_free(mem_ctx);
if (upcase_table == NULL) {
/* try also under codepages for testing purposes */
upcase_table = map_file("codepages/upcase.dat", 0x20000);
if (upcase_table == NULL) {
upcase_table = (void *)-1;
}
}
if (lowcase_table == NULL) {
/* try also under codepages for testing purposes */
lowcase_table = map_file("codepages/lowcase.dat", 0x20000);
if (lowcase_table == NULL) {
lowcase_table = (void *)-1;
}
}
}
/**
Convert a codepoint_t to upper case.
**/
codepoint_t toupper_w(codepoint_t val)
{
if (val < 128) {
return toupper(val);
}
if (upcase_table == NULL) {
load_case_tables();
}
if (upcase_table == (void *)-1) {
return val;
}
if (val & 0xFFFF0000) {
return val;
}
return SVAL(upcase_table, val*2);
}
/**
Convert a codepoint_t to lower case.
**/
codepoint_t tolower_w(codepoint_t val)
{
if (val < 128) {
return tolower(val);
}
if (lowcase_table == NULL) {
load_case_tables();
}
if (lowcase_table == (void *)-1) {
return val;
}
if (val & 0xFFFF0000) {
return val;
}
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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