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dis-bench / src /php /php-src /ext /mbstring /libmbfl /mbfl /mbfl_convert.c
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/*
* "streamable kanji code filter and converter"
* Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
*
* LICENSE NOTICES
*
* This file is part of "streamable kanji code filter and converter",
* which is distributed under the terms of GNU Lesser General Public
* License (version 2) as published by the Free Software Foundation.
*
* This software 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with "streamable kanji code filter and converter";
* if not, write to the Free Software Foundation, Inc., 59 Temple Place,
* Suite 330, Boston, MA 02111-1307 USA
*
* The author of this file:
*
*/
/*
* The source code included in this files was separated from mbfilter.c
* by Moriyoshi Koizumi <moriyoshi@php.net> on 20 Dec 2002. The file
* mbfilter.c is included in this package .
*
*/
#include <stddef.h>
#include "mbfl_encoding.h"
#include "mbfl_filter_output.h"
#include "mbfilter_pass.h"
#include "mbfilter_8bit.h"
#include "mbfilter_wchar.h"
#include "filters/mbfilter_base64.h"
#include "filters/mbfilter_cjk.h"
#include "filters/mbfilter_qprint.h"
#include "filters/mbfilter_uuencode.h"
#include "filters/mbfilter_7bit.h"
#include "filters/mbfilter_utf7.h"
#include "filters/mbfilter_utf7imap.h"
#include "filters/mbfilter_utf8.h"
#include "filters/mbfilter_utf16.h"
#include "filters/mbfilter_utf32.h"
#include "filters/mbfilter_ucs4.h"
#include "filters/mbfilter_ucs2.h"
#include "filters/mbfilter_htmlent.h"
#include "filters/mbfilter_singlebyte.h"
/* hex character table "0123456789ABCDEF" */
static char mbfl_hexchar_table[] = {
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,0x45,0x46
};
static const struct mbfl_convert_vtbl *mbfl_special_filter_list[] = {
&vtbl_8bit_b64,
&vtbl_b64_8bit,
&vtbl_uuencode_8bit,
&vtbl_8bit_qprint,
&vtbl_qprint_8bit,
&vtbl_pass,
NULL
};
static void mbfl_convert_filter_init(mbfl_convert_filter *filter, const mbfl_encoding *from, const mbfl_encoding *to,
const struct mbfl_convert_vtbl *vtbl, output_function_t output_function, flush_function_t flush_function, void* data)
{
/* encoding structure */
filter->from = from;
filter->to = to;
if (output_function != NULL) {
filter->output_function = output_function;
} else {
filter->output_function = mbfl_filter_output_null;
}
filter->flush_function = flush_function;
filter->data = data;
filter->illegal_mode = MBFL_OUTPUTFILTER_ILLEGAL_MODE_CHAR;
filter->illegal_substchar = '?';
filter->num_illegalchar = 0;
filter->filter_dtor = vtbl->filter_dtor;
filter->filter_function = vtbl->filter_function;
filter->filter_flush = (filter_flush_t)vtbl->filter_flush;
filter->filter_copy = vtbl->filter_copy;
(*vtbl->filter_ctor)(filter);
}
mbfl_convert_filter* mbfl_convert_filter_new(const mbfl_encoding *from, const mbfl_encoding *to, output_function_t output_function,
flush_function_t flush_function, void* data)
{
const struct mbfl_convert_vtbl *vtbl = mbfl_convert_filter_get_vtbl(from, to);
if (vtbl == NULL) {
return NULL;
}
mbfl_convert_filter *filter = emalloc(sizeof(mbfl_convert_filter));
mbfl_convert_filter_init(filter, from, to, vtbl, output_function, flush_function, data);
return filter;
}
mbfl_convert_filter* mbfl_convert_filter_new2(const struct mbfl_convert_vtbl *vtbl, output_function_t output_function,
flush_function_t flush_function, void* data)
{
const mbfl_encoding *from_encoding = mbfl_no2encoding(vtbl->from);
const mbfl_encoding *to_encoding = mbfl_no2encoding(vtbl->to);
mbfl_convert_filter *filter = emalloc(sizeof(mbfl_convert_filter));
mbfl_convert_filter_init(filter, from_encoding, to_encoding, vtbl, output_function, flush_function, data);
return filter;
}
void mbfl_convert_filter_delete(mbfl_convert_filter *filter)
{
if (filter->filter_dtor) {
(*filter->filter_dtor)(filter);
}
efree(filter);
}
/* Feed a char, return 0 if ok - used by mailparse ext */
int mbfl_convert_filter_feed(int c, mbfl_convert_filter *filter)
{
return (*filter->filter_function)(c, filter);
}
/* Feed string into `filter` byte by byte; return pointer to first byte not processed */
unsigned char* mbfl_convert_filter_feed_string(mbfl_convert_filter *filter, unsigned char *p, size_t len)
{
while (len--) {
if ((*filter->filter_function)(*p++, filter) < 0) {
break;
}
}
return p;
}
int mbfl_convert_filter_flush(mbfl_convert_filter *filter)
{
(*filter->filter_flush)(filter);
return 0;
}
void mbfl_convert_filter_reset(mbfl_convert_filter *filter, const mbfl_encoding *from, const mbfl_encoding *to)
{
if (filter->filter_dtor) {
(*filter->filter_dtor)(filter);
}
const struct mbfl_convert_vtbl *vtbl = mbfl_convert_filter_get_vtbl(from, to);
if (vtbl == NULL) {
vtbl = &vtbl_pass;
}
mbfl_convert_filter_init(filter, from, to, vtbl, filter->output_function, filter->flush_function, filter->data);
}
void mbfl_convert_filter_copy(mbfl_convert_filter *src, mbfl_convert_filter *dest)
{
if (src->filter_copy != NULL) {
src->filter_copy(src, dest);
return;
}
*dest = *src;
}
void mbfl_convert_filter_devcat(mbfl_convert_filter *filter, mbfl_memory_device *src)
{
mbfl_convert_filter_feed_string(filter, src->buffer, src->pos);
}
int mbfl_convert_filter_strcat(mbfl_convert_filter *filter, const unsigned char *p)
{
int c;
while ((c = *p++)) {
if ((*filter->filter_function)(c, filter) < 0) {
return -1;
}
}
return 0;
}
static int mbfl_filt_conv_output_hex(unsigned int w, mbfl_convert_filter *filter)
{
bool nonzero = false;
int shift = 28, ret = 0;
while (shift >= 0) {
int n = (w >> shift) & 0xF;
if (n || nonzero) {
nonzero = true;
ret = (*filter->filter_function)(mbfl_hexchar_table[n], filter);
if (ret < 0) {
return ret;
}
}
shift -= 4;
}
if (!nonzero) {
/* No hex digits were output by above loop */
ret = (*filter->filter_function)('0', filter);
}
return ret;
}
/* illegal character output function for conv-filter */
int mbfl_filt_conv_illegal_output(int c, mbfl_convert_filter *filter)
{
unsigned int w = c;
int ret = 0;
int mode_backup = filter->illegal_mode;
uint32_t substchar_backup = filter->illegal_substchar;
/* The used substitution character may not be supported by the target character encoding.
* If that happens, first try to use "?" instead and if that also fails, silently drop the
* character. */
if (filter->illegal_mode == MBFL_OUTPUTFILTER_ILLEGAL_MODE_CHAR
&& filter->illegal_substchar != '?') {
filter->illegal_substchar = '?';
} else {
filter->illegal_mode = MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE;
}
switch (mode_backup) {
case MBFL_OUTPUTFILTER_ILLEGAL_MODE_CHAR:
ret = (*filter->filter_function)(substchar_backup, filter);
break;
case MBFL_OUTPUTFILTER_ILLEGAL_MODE_LONG:
if (w != MBFL_BAD_INPUT) {
ret = mbfl_convert_filter_strcat(filter, (const unsigned char *)"U+");
if (ret < 0)
break;
ret = mbfl_filt_conv_output_hex(w, filter);
} else {
ret = (*filter->filter_function)(substchar_backup, filter);
}
break;
case MBFL_OUTPUTFILTER_ILLEGAL_MODE_ENTITY:
if (w != MBFL_BAD_INPUT) {
ret = mbfl_convert_filter_strcat(filter, (const unsigned char *)"&#x");
if (ret < 0)
break;
ret = mbfl_filt_conv_output_hex(w, filter);
if (ret < 0)
break;
ret = mbfl_convert_filter_strcat(filter, (const unsigned char *)";");
} else {
ret = (*filter->filter_function)(substchar_backup, filter);
}
break;
case MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE:
default:
break;
}
filter->illegal_mode = mode_backup;
filter->illegal_substchar = substchar_backup;
filter->num_illegalchar++;
return ret;
}
const struct mbfl_convert_vtbl* mbfl_convert_filter_get_vtbl(const mbfl_encoding *from, const mbfl_encoding *to)
{
if (to->no_encoding == mbfl_no_encoding_base64 ||
to->no_encoding == mbfl_no_encoding_qprint) {
from = &mbfl_encoding_8bit;
} else if (from->no_encoding == mbfl_no_encoding_base64 ||
from->no_encoding == mbfl_no_encoding_qprint ||
from->no_encoding == mbfl_no_encoding_uuencode) {
to = &mbfl_encoding_8bit;
}
if (to == from && (to == &mbfl_encoding_wchar || to == &mbfl_encoding_8bit)) {
return &vtbl_pass;
}
if (to->no_encoding == mbfl_no_encoding_wchar) {
return from->input_filter;
} else if (from->no_encoding == mbfl_no_encoding_wchar) {
return to->output_filter;
} else {
int i = 0;
const struct mbfl_convert_vtbl *vtbl;
while ((vtbl = mbfl_special_filter_list[i++])) {
if (vtbl->from == from->no_encoding && vtbl->to == to->no_encoding) {
return vtbl;
}
}
return NULL;
}
}
/*
* commonly used constructor
*/
void mbfl_filt_conv_common_ctor(mbfl_convert_filter *filter)
{
filter->status = filter->cache = 0;
}
int mbfl_filt_conv_common_flush(mbfl_convert_filter *filter)
{
if (filter->flush_function) {
(*filter->flush_function)(filter->data);
}
return 0;
}
zend_string* mb_fast_convert(unsigned char *in, size_t in_len, const mbfl_encoding *from, const mbfl_encoding *to, uint32_t replacement_char, unsigned int error_mode, unsigned int *num_errors)
{
uint32_t wchar_buf[128];
unsigned int state = 0;
if (to == &mbfl_encoding_base64 || to == &mbfl_encoding_qprint) {
from = &mbfl_encoding_8bit;
} else if (from == &mbfl_encoding_base64 || from == &mbfl_encoding_qprint || from == &mbfl_encoding_uuencode) {
to = &mbfl_encoding_8bit;
}
mb_convert_buf buf;
mb_convert_buf_init(&buf, in_len, replacement_char, error_mode);
while (in_len) {
size_t out_len = from->to_wchar(&in, &in_len, wchar_buf, 128, &state);
ZEND_ASSERT(out_len <= 128);
to->from_wchar(wchar_buf, out_len, &buf, !in_len);
}
*num_errors = buf.errors;
return mb_convert_buf_result(&buf, to);
}
static uint32_t* convert_cp_to_hex(uint32_t cp, uint32_t *out)
{
bool nonzero = false;
int shift = 28;
while (shift >= 0) {
int n = (cp >> shift) & 0xF;
if (n || nonzero) {
nonzero = true;
*out++ = mbfl_hexchar_table[n];
}
shift -= 4;
}
if (!nonzero) {
/* No hex digits were output by above loop */
*out++ = '0';
}
return out;
}
static size_t mb_illegal_marker(uint32_t bad_cp, uint32_t *out, unsigned int err_mode, uint32_t replacement_char)
{
uint32_t *start = out;
if (bad_cp == MBFL_BAD_INPUT) {
/* Input string contained a byte sequence which was invalid in the 'from' encoding
* Unless the error handling mode is set to NONE, insert the replacement character */
if (err_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
*out++ = replacement_char;
}
} else {
/* Input string contained a byte sequence which was valid in the 'from' encoding,
* but decoded to a Unicode codepoint which cannot be represented in the 'to' encoding */
switch (err_mode) {
case MBFL_OUTPUTFILTER_ILLEGAL_MODE_CHAR:
*out++ = replacement_char;
break;
case MBFL_OUTPUTFILTER_ILLEGAL_MODE_LONG:
out[0] = 'U';
out[1] = '+';
out = convert_cp_to_hex(bad_cp, &out[2]);
break;
case MBFL_OUTPUTFILTER_ILLEGAL_MODE_ENTITY:
out[0] = '&'; out[1] = '#'; out[2] = 'x';
out = convert_cp_to_hex(bad_cp, &out[3]);
*out++ = ';';
break;
}
}
return out - start;
}
void mb_illegal_output(uint32_t bad_cp, mb_from_wchar_fn fn, mb_convert_buf* buf)
{
buf->errors++;
uint32_t temp[12];
uint32_t repl_char = buf->replacement_char;
unsigned int err_mode = buf->error_mode;
if (err_mode == MBFL_OUTPUTFILTER_ILLEGAL_MODE_BADUTF8) {
/* This mode is for internal use only, when converting a string to
* UTF-8 before searching it; it uses a byte which is illegal in
* UTF-8 as an error marker. This ensures that error markers will
* never 'accidentally' match valid text, as could happen when a
* character like '?' is used as an error marker. */
MB_CONVERT_BUF_ENSURE(buf, buf->out, buf->limit, 1);
buf->out = mb_convert_buf_add(buf->out, 0xFF);
return;
}
size_t len = mb_illegal_marker(bad_cp, temp, err_mode, repl_char);
/* Avoid infinite loop if `fn` is not able to handle `repl_char` */
if (err_mode == MBFL_OUTPUTFILTER_ILLEGAL_MODE_CHAR && repl_char != '?') {
buf->replacement_char = '?';
} else {
buf->error_mode = MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE;
}
fn(temp, len, buf, false);
buf->replacement_char = repl_char;
buf->error_mode = err_mode;
}