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filters.c
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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2014 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: |
| Wez Furlong (wez@thebrainroom.com) |
| Sara Golemon (pollita@php.net) |
| Moriyoshi Koizumi (moriyoshi@php.net) |
| Marcus Boerger (helly@php.net) |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include "php_globals.h"
#include "ext/standard/basic_functions.h"
#include "ext/standard/file.h"
#include "ext/standard/php_string.h"
#include "ext/standard/php_smart_str.h"
/* {{{ rot13 stream filter implementation */
static char rot13_from[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
static char rot13_to[] = "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM";
static php_stream_filter_status_t strfilter_rot13_filter(
php_stream *stream,
php_stream_filter *thisfilter,
php_stream_bucket_brigade *buckets_in,
php_stream_bucket_brigade *buckets_out,
size_t *bytes_consumed,
int flags
TSRMLS_DC)
{
php_stream_bucket *bucket;
size_t consumed = 0;
while (buckets_in->head) {
bucket = php_stream_bucket_make_writeable(buckets_in->head TSRMLS_CC);
php_strtr(bucket->buf, bucket->buflen, rot13_from, rot13_to, 52);
consumed += bucket->buflen;
php_stream_bucket_append(buckets_out, bucket TSRMLS_CC);
}
if (bytes_consumed) {
*bytes_consumed = consumed;
}
return PSFS_PASS_ON;
}
static php_stream_filter_ops strfilter_rot13_ops = {
strfilter_rot13_filter,
NULL,
"string.rot13"
};
static php_stream_filter *strfilter_rot13_create(const char *filtername, zval *filterparams, int persistent TSRMLS_DC)
{
return php_stream_filter_alloc(&strfilter_rot13_ops, NULL, persistent);
}
static php_stream_filter_factory strfilter_rot13_factory = {
strfilter_rot13_create
};
/* }}} */
/* {{{ string.toupper / string.tolower stream filter implementation */
static char lowercase[] = "abcdefghijklmnopqrstuvwxyz";
static char uppercase[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
static php_stream_filter_status_t strfilter_toupper_filter(
php_stream *stream,
php_stream_filter *thisfilter,
php_stream_bucket_brigade *buckets_in,
php_stream_bucket_brigade *buckets_out,
size_t *bytes_consumed,
int flags
TSRMLS_DC)
{
php_stream_bucket *bucket;
size_t consumed = 0;
while (buckets_in->head) {
bucket = php_stream_bucket_make_writeable(buckets_in->head TSRMLS_CC);
php_strtr(bucket->buf, bucket->buflen, lowercase, uppercase, 26);
consumed += bucket->buflen;
php_stream_bucket_append(buckets_out, bucket TSRMLS_CC);
}
if (bytes_consumed) {
*bytes_consumed = consumed;
}
return PSFS_PASS_ON;
}
static php_stream_filter_status_t strfilter_tolower_filter(
php_stream *stream,
php_stream_filter *thisfilter,
php_stream_bucket_brigade *buckets_in,
php_stream_bucket_brigade *buckets_out,
size_t *bytes_consumed,
int flags
TSRMLS_DC)
{
php_stream_bucket *bucket;
size_t consumed = 0;
while (buckets_in->head) {
bucket = php_stream_bucket_make_writeable(buckets_in->head TSRMLS_CC);
php_strtr(bucket->buf, bucket->buflen, uppercase, lowercase, 26);
consumed += bucket->buflen;
php_stream_bucket_append(buckets_out, bucket TSRMLS_CC);
}
if (bytes_consumed) {
*bytes_consumed = consumed;
}
return PSFS_PASS_ON;
}
static php_stream_filter_ops strfilter_toupper_ops = {
strfilter_toupper_filter,
NULL,
"string.toupper"
};
static php_stream_filter_ops strfilter_tolower_ops = {
strfilter_tolower_filter,
NULL,
"string.tolower"
};
static php_stream_filter *strfilter_toupper_create(const char *filtername, zval *filterparams, int persistent TSRMLS_DC)
{
return php_stream_filter_alloc(&strfilter_toupper_ops, NULL, persistent);
}
static php_stream_filter *strfilter_tolower_create(const char *filtername, zval *filterparams, int persistent TSRMLS_DC)
{
return php_stream_filter_alloc(&strfilter_tolower_ops, NULL, persistent);
}
static php_stream_filter_factory strfilter_toupper_factory = {
strfilter_toupper_create
};
static php_stream_filter_factory strfilter_tolower_factory = {
strfilter_tolower_create
};
/* }}} */
/* {{{ strip_tags filter implementation */
typedef struct _php_strip_tags_filter {
const char *allowed_tags;
int allowed_tags_len;
int state;
int persistent;
} php_strip_tags_filter;
static int php_strip_tags_filter_ctor(php_strip_tags_filter *inst, const char *allowed_tags, int allowed_tags_len, int persistent)
{
if (allowed_tags != NULL) {
if (NULL == (inst->allowed_tags = pemalloc(allowed_tags_len, persistent))) {
return FAILURE;
}
memcpy((char *)inst->allowed_tags, allowed_tags, allowed_tags_len);
inst->allowed_tags_len = allowed_tags_len;
} else {
inst->allowed_tags = NULL;
}
inst->state = 0;
inst->persistent = persistent;
return SUCCESS;
}
static void php_strip_tags_filter_dtor(php_strip_tags_filter *inst)
{
if (inst->allowed_tags != NULL) {
pefree((void *)inst->allowed_tags, inst->persistent);
}
}
static php_stream_filter_status_t strfilter_strip_tags_filter(
php_stream *stream,
php_stream_filter *thisfilter,
php_stream_bucket_brigade *buckets_in,
php_stream_bucket_brigade *buckets_out,
size_t *bytes_consumed,
int flags
TSRMLS_DC)
{
php_stream_bucket *bucket;
size_t consumed = 0;
php_strip_tags_filter *inst = (php_strip_tags_filter *) thisfilter->abstract;
while (buckets_in->head) {
bucket = php_stream_bucket_make_writeable(buckets_in->head TSRMLS_CC);
consumed = bucket->buflen;
bucket->buflen = php_strip_tags(bucket->buf, bucket->buflen, &(inst->state), (char *)inst->allowed_tags, inst->allowed_tags_len);
php_stream_bucket_append(buckets_out, bucket TSRMLS_CC);
}
if (bytes_consumed) {
*bytes_consumed = consumed;
}
return PSFS_PASS_ON;
}
static void strfilter_strip_tags_dtor(php_stream_filter *thisfilter TSRMLS_DC)
{
assert(thisfilter->abstract != NULL);
php_strip_tags_filter_dtor((php_strip_tags_filter *)thisfilter->abstract);
pefree(thisfilter->abstract, ((php_strip_tags_filter *)thisfilter->abstract)->persistent);
}
static php_stream_filter_ops strfilter_strip_tags_ops = {
strfilter_strip_tags_filter,
strfilter_strip_tags_dtor,
"string.strip_tags"
};
static php_stream_filter *strfilter_strip_tags_create(const char *filtername, zval *filterparams, int persistent TSRMLS_DC)
{
php_strip_tags_filter *inst;
smart_str tags_ss = { 0, 0, 0 };
inst = pemalloc(sizeof(php_strip_tags_filter), persistent);
if (inst == NULL) { /* it's possible pemalloc returns NULL
instead of causing it to bail out */
return NULL;
}
if (filterparams != NULL) {
if (Z_TYPE_P(filterparams) == IS_ARRAY) {
HashPosition pos;
zval **tmp;
zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(filterparams), &pos);
while (zend_hash_get_current_data_ex(Z_ARRVAL_P(filterparams), (void **) &tmp, &pos) == SUCCESS) {
convert_to_string_ex(tmp);
smart_str_appendc(&tags_ss, '<');
smart_str_appendl(&tags_ss, Z_STRVAL_PP(tmp), Z_STRLEN_PP(tmp));
smart_str_appendc(&tags_ss, '>');
zend_hash_move_forward_ex(Z_ARRVAL_P(filterparams), &pos);
}
smart_str_0(&tags_ss);
} else {
/* FIXME: convert_to_* may clutter zvals and lead it into segfault ? */
convert_to_string_ex(&filterparams);
tags_ss.c = Z_STRVAL_P(filterparams);
tags_ss.len = Z_STRLEN_P(filterparams);
tags_ss.a = 0;
}
}
if (php_strip_tags_filter_ctor(inst, tags_ss.c, tags_ss.len, persistent) != SUCCESS) {
if (tags_ss.a != 0) {
STR_FREE(tags_ss.c);
}
pefree(inst, persistent);
return NULL;
}
if (tags_ss.a != 0) {
STR_FREE(tags_ss.c);
}
return php_stream_filter_alloc(&strfilter_strip_tags_ops, inst, persistent);
}
static php_stream_filter_factory strfilter_strip_tags_factory = {
strfilter_strip_tags_create
};
/* }}} */
/* {{{ base64 / quoted_printable stream filter implementation */
typedef enum _php_conv_err_t {
PHP_CONV_ERR_SUCCESS = SUCCESS,
PHP_CONV_ERR_UNKNOWN,
PHP_CONV_ERR_TOO_BIG,
PHP_CONV_ERR_INVALID_SEQ,
PHP_CONV_ERR_UNEXPECTED_EOS,
PHP_CONV_ERR_EXISTS,
PHP_CONV_ERR_MORE,
PHP_CONV_ERR_ALLOC,
PHP_CONV_ERR_NOT_FOUND
} php_conv_err_t;
typedef struct _php_conv php_conv;
typedef php_conv_err_t (*php_conv_convert_func)(php_conv *, const char **, size_t *, char **, size_t *);
typedef void (*php_conv_dtor_func)(php_conv *);
struct _php_conv {
php_conv_convert_func convert_op;
php_conv_dtor_func dtor;
};
#define php_conv_convert(a, b, c, d, e) ((php_conv *)(a))->convert_op((php_conv *)(a), (b), (c), (d), (e))
#define php_conv_dtor(a) ((php_conv *)a)->dtor((a))
/* {{{ php_conv_base64_encode */
typedef struct _php_conv_base64_encode {
php_conv _super;
unsigned char erem[3];
size_t erem_len;
unsigned int line_ccnt;
unsigned int line_len;
const char *lbchars;
int lbchars_dup;
size_t lbchars_len;
int persistent;
} php_conv_base64_encode;
static php_conv_err_t php_conv_base64_encode_convert(php_conv_base64_encode *inst, const char **in_p, size_t *in_left, char **out_p, size_t *out_left);
static void php_conv_base64_encode_dtor(php_conv_base64_encode *inst);
static unsigned char b64_tbl_enc[256] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
};
static php_conv_err_t php_conv_base64_encode_ctor(php_conv_base64_encode *inst, unsigned int line_len, const char *lbchars, size_t lbchars_len, int lbchars_dup, int persistent)
{
inst->_super.convert_op = (php_conv_convert_func) php_conv_base64_encode_convert;
inst->_super.dtor = (php_conv_dtor_func) php_conv_base64_encode_dtor;
inst->erem_len = 0;
inst->line_ccnt = line_len;
inst->line_len = line_len;
if (lbchars != NULL) {
inst->lbchars = (lbchars_dup ? pestrdup(lbchars, persistent) : lbchars);
inst->lbchars_len = lbchars_len;
} else {
inst->lbchars = NULL;
}
inst->lbchars_dup = lbchars_dup;
inst->persistent = persistent;
return PHP_CONV_ERR_SUCCESS;
}
static void php_conv_base64_encode_dtor(php_conv_base64_encode *inst)
{
assert(inst != NULL);
if (inst->lbchars_dup && inst->lbchars != NULL) {
pefree((void *)inst->lbchars, inst->persistent);
}
}
static php_conv_err_t php_conv_base64_encode_flush(php_conv_base64_encode *inst, const char **in_pp, size_t *in_left_p, char **out_pp, size_t *out_left_p)
{
volatile php_conv_err_t err = PHP_CONV_ERR_SUCCESS;
register unsigned char *pd;
register size_t ocnt;
unsigned int line_ccnt;
pd = (unsigned char *)(*out_pp);
ocnt = *out_left_p;
line_ccnt = inst->line_ccnt;
switch (inst->erem_len) {
case 0:
/* do nothing */
break;
case 1:
if (line_ccnt < 4 && inst->lbchars != NULL) {
if (ocnt < inst->lbchars_len) {
return PHP_CONV_ERR_TOO_BIG;
}
memcpy(pd, inst->lbchars, inst->lbchars_len);
pd += inst->lbchars_len;
ocnt -= inst->lbchars_len;
line_ccnt = inst->line_len;
}
if (ocnt < 4) {
err = PHP_CONV_ERR_TOO_BIG;
goto out;
}
*(pd++) = b64_tbl_enc[(inst->erem[0] >> 2)];
*(pd++) = b64_tbl_enc[(unsigned char)(inst->erem[0] << 4)];
*(pd++) = '=';
*(pd++) = '=';
inst->erem_len = 0;
ocnt -= 4;
line_ccnt -= 4;
break;
case 2:
if (line_ccnt < 4 && inst->lbchars != NULL) {
if (ocnt < inst->lbchars_len) {
return PHP_CONV_ERR_TOO_BIG;
}
memcpy(pd, inst->lbchars, inst->lbchars_len);
pd += inst->lbchars_len;
ocnt -= inst->lbchars_len;
line_ccnt = inst->line_len;
}
if (ocnt < 4) {
err = PHP_CONV_ERR_TOO_BIG;
goto out;
}
*(pd++) = b64_tbl_enc[(inst->erem[0] >> 2)];
*(pd++) = b64_tbl_enc[(unsigned char)(inst->erem[0] << 4) | (inst->erem[1] >> 4)];
*(pd++) = b64_tbl_enc[(unsigned char)(inst->erem[1] << 2)];
*(pd++) = '=';
inst->erem_len = 0;
ocnt -=4;
line_ccnt -= 4;
break;
default:
/* should not happen... */
err = PHP_CONV_ERR_UNKNOWN;
break;
}
out:
*out_pp = (char *)pd;
*out_left_p = ocnt;
inst->line_ccnt = line_ccnt;
return err;
}
static php_conv_err_t php_conv_base64_encode_convert(php_conv_base64_encode *inst, const char **in_pp, size_t *in_left_p, char **out_pp, size_t *out_left_p)
{
volatile php_conv_err_t err = PHP_CONV_ERR_SUCCESS;
register size_t ocnt, icnt;
register unsigned char *ps, *pd;
register unsigned int line_ccnt;
if (in_pp == NULL || in_left_p == NULL) {
return php_conv_base64_encode_flush(inst, in_pp, in_left_p, out_pp, out_left_p);
}
pd = (unsigned char *)(*out_pp);
ocnt = *out_left_p;
ps = (unsigned char *)(*in_pp);
icnt = *in_left_p;
line_ccnt = inst->line_ccnt;
/* consume the remainder first */
switch (inst->erem_len) {
case 1:
if (icnt >= 2) {
if (line_ccnt < 4 && inst->lbchars != NULL) {
if (ocnt < inst->lbchars_len) {
return PHP_CONV_ERR_TOO_BIG;
}
memcpy(pd, inst->lbchars, inst->lbchars_len);
pd += inst->lbchars_len;
ocnt -= inst->lbchars_len;
line_ccnt = inst->line_len;
}
if (ocnt < 4) {
err = PHP_CONV_ERR_TOO_BIG;
goto out;
}
*(pd++) = b64_tbl_enc[(inst->erem[0] >> 2)];
*(pd++) = b64_tbl_enc[(unsigned char)(inst->erem[0] << 4) | (ps[0] >> 4)];
*(pd++) = b64_tbl_enc[(unsigned char)(ps[0] << 2) | (ps[1] >> 6)];
*(pd++) = b64_tbl_enc[ps[1]];
ocnt -= 4;
ps += 2;
icnt -= 2;
inst->erem_len = 0;
line_ccnt -= 4;
}
break;
case 2:
if (icnt >= 1) {
if (inst->line_ccnt < 4 && inst->lbchars != NULL) {
if (ocnt < inst->lbchars_len) {
return PHP_CONV_ERR_TOO_BIG;
}
memcpy(pd, inst->lbchars, inst->lbchars_len);
pd += inst->lbchars_len;
ocnt -= inst->lbchars_len;
line_ccnt = inst->line_len;
}
if (ocnt < 4) {
err = PHP_CONV_ERR_TOO_BIG;
goto out;
}
*(pd++) = b64_tbl_enc[(inst->erem[0] >> 2)];
*(pd++) = b64_tbl_enc[(unsigned char)(inst->erem[0] << 4) | (inst->erem[1] >> 4)];
*(pd++) = b64_tbl_enc[(unsigned char)(inst->erem[1] << 2) | (ps[0] >> 6)];
*(pd++) = b64_tbl_enc[ps[0]];
ocnt -= 4;
ps += 1;
icnt -= 1;
inst->erem_len = 0;
line_ccnt -= 4;
}
break;
}
while (icnt >= 3) {
if (line_ccnt < 4 && inst->lbchars != NULL) {
if (ocnt < inst->lbchars_len) {
err = PHP_CONV_ERR_TOO_BIG;
goto out;
}
memcpy(pd, inst->lbchars, inst->lbchars_len);
pd += inst->lbchars_len;
ocnt -= inst->lbchars_len;
line_ccnt = inst->line_len;
}
if (ocnt < 4) {
err = PHP_CONV_ERR_TOO_BIG;
goto out;
}
*(pd++) = b64_tbl_enc[ps[0] >> 2];
*(pd++) = b64_tbl_enc[(unsigned char)(ps[0] << 4) | (ps[1] >> 4)];
*(pd++) = b64_tbl_enc[(unsigned char)(ps[1] << 2) | (ps[2] >> 6)];
*(pd++) = b64_tbl_enc[ps[2]];
ps += 3;
icnt -=3;
ocnt -= 4;
line_ccnt -= 4;
}
for (;icnt > 0; icnt--) {
inst->erem[inst->erem_len++] = *(ps++);
}
out:
*in_pp = (const char *)ps;
*in_left_p = icnt;
*out_pp = (char *)pd;
*out_left_p = ocnt;
inst->line_ccnt = line_ccnt;
return err;
}
/* }}} */
/* {{{ php_conv_base64_decode */
typedef struct _php_conv_base64_decode {
php_conv _super;
unsigned int urem;
unsigned int urem_nbits;
unsigned int ustat;
int eos;
} php_conv_base64_decode;
static php_conv_err_t php_conv_base64_decode_convert(php_conv_base64_decode *inst, const char **in_p, size_t *in_left, char **out_p, size_t *out_left);
static void php_conv_base64_decode_dtor(php_conv_base64_decode *inst);
static unsigned int b64_tbl_dec[256] = {
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64,128, 64, 64,
64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
};
static int php_conv_base64_decode_ctor(php_conv_base64_decode *inst)
{
inst->_super.convert_op = (php_conv_convert_func) php_conv_base64_decode_convert;
inst->_super.dtor = (php_conv_dtor_func) php_conv_base64_decode_dtor;
inst->urem = 0;
inst->urem_nbits = 0;
inst->ustat = 0;
inst->eos = 0;
return SUCCESS;
}
static void php_conv_base64_decode_dtor(php_conv_base64_decode *inst)
{
/* do nothing */
}
#define bmask(a) (0xffff >> (16 - a))
static php_conv_err_t php_conv_base64_decode_convert(php_conv_base64_decode *inst, const char **in_pp, size_t *in_left_p, char **out_pp, size_t *out_left_p)
{
php_conv_err_t err;
unsigned int urem, urem_nbits;
unsigned int pack, pack_bcnt;
unsigned char *ps, *pd;
size_t icnt, ocnt;
unsigned int ustat;
static const unsigned int nbitsof_pack = 8;
if (in_pp == NULL || in_left_p == NULL) {
if (inst->eos || inst->urem_nbits == 0) {
return PHP_CONV_ERR_SUCCESS;
}
return PHP_CONV_ERR_UNEXPECTED_EOS;
}
err = PHP_CONV_ERR_SUCCESS;
ps = (unsigned char *)*in_pp;
pd = (unsigned char *)*out_pp;
icnt = *in_left_p;
ocnt = *out_left_p;
urem = inst->urem;
urem_nbits = inst->urem_nbits;
ustat = inst->ustat;
pack = 0;
pack_bcnt = nbitsof_pack;
for (;;) {
if (pack_bcnt >= urem_nbits) {
pack_bcnt -= urem_nbits;
pack |= (urem << pack_bcnt);
urem_nbits = 0;
} else {
urem_nbits -= pack_bcnt;
pack |= (urem >> urem_nbits);
urem &= bmask(urem_nbits);
pack_bcnt = 0;
}
if (pack_bcnt > 0) {
unsigned int i;
if (icnt < 1) {
break;
}
i = b64_tbl_dec[(unsigned int)*(ps++)];
icnt--;
ustat |= i & 0x80;
if (!(i & 0xc0)) {
if (ustat) {
err = PHP_CONV_ERR_INVALID_SEQ;
break;
}
if (6 <= pack_bcnt) {
pack_bcnt -= 6;
pack |= (i << pack_bcnt);
urem = 0;
} else {
urem_nbits = 6 - pack_bcnt;
pack |= (i >> urem_nbits);
urem = i & bmask(urem_nbits);
pack_bcnt = 0;
}
} else if (ustat) {
if (pack_bcnt == 8 || pack_bcnt == 2) {
err = PHP_CONV_ERR_INVALID_SEQ;
break;
}
inst->eos = 1;
}
}
if ((pack_bcnt | ustat) == 0) {
if (ocnt < 1) {
err = PHP_CONV_ERR_TOO_BIG;
break;
}
*(pd++) = pack;
ocnt--;
pack = 0;
pack_bcnt = nbitsof_pack;
}
}
if (urem_nbits >= pack_bcnt) {
urem |= (pack << (urem_nbits - pack_bcnt));
urem_nbits += (nbitsof_pack - pack_bcnt);
} else {
urem |= (pack >> (pack_bcnt - urem_nbits));
urem_nbits += (nbitsof_pack - pack_bcnt);
}
inst->urem = urem;
inst->urem_nbits = urem_nbits;
inst->ustat = ustat;
*in_pp = (const char *)ps;
*in_left_p = icnt;
*out_pp = (char *)pd;
*out_left_p = ocnt;
return err;
}
#undef bmask
/* }}} */
/* {{{ php_conv_qprint_encode */
typedef struct _php_conv_qprint_encode {
php_conv _super;
int opts;
unsigned int line_ccnt;
unsigned int line_len;
const char *lbchars;
int lbchars_dup;
size_t lbchars_len;
int persistent;
unsigned int lb_ptr;
unsigned int lb_cnt;
} php_conv_qprint_encode;
#define PHP_CONV_QPRINT_OPT_BINARY 0x00000001
#define PHP_CONV_QPRINT_OPT_FORCE_ENCODE_FIRST 0x00000002
static void php_conv_qprint_encode_dtor(php_conv_qprint_encode *inst);
static php_conv_err_t php_conv_qprint_encode_convert(php_conv_qprint_encode *inst, const char **in_pp, size_t *in_left_p, char **out_pp, size_t *out_left_p);
static void php_conv_qprint_encode_dtor(php_conv_qprint_encode *inst)
{
assert(inst != NULL);
if (inst->lbchars_dup && inst->lbchars != NULL) {
pefree((void *)inst->lbchars, inst->persistent);
}
}
#define NEXT_CHAR(ps, icnt, lb_ptr, lb_cnt, lbchars) \
((lb_ptr) < (lb_cnt) ? (lbchars)[(lb_ptr)] : *(ps))
#define CONSUME_CHAR(ps, icnt, lb_ptr, lb_cnt) \
if ((lb_ptr) < (lb_cnt)) { \
(lb_ptr)++; \
} else { \
(lb_cnt) = (lb_ptr) = 0; \
--(icnt); \
(ps)++; \
}
static php_conv_err_t php_conv_qprint_encode_convert(php_conv_qprint_encode *inst, const char **in_pp, size_t *in_left_p, char **out_pp, size_t *out_left_p)
{
php_conv_err_t err = PHP_CONV_ERR_SUCCESS;
unsigned char *ps, *pd;
size_t icnt, ocnt;
unsigned int c;
unsigned int line_ccnt;
unsigned int lb_ptr;
unsigned int lb_cnt;
unsigned int trail_ws;
int opts;
static char qp_digits[] = "0123456789ABCDEF";
line_ccnt = inst->line_ccnt;
opts = inst->opts;
lb_ptr = inst->lb_ptr;
lb_cnt = inst->lb_cnt;
if ((in_pp == NULL || in_left_p == NULL) && (lb_ptr >=lb_cnt)) {
return PHP_CONV_ERR_SUCCESS;
}
ps = (unsigned char *)(*in_pp);
icnt = *in_left_p;
pd = (unsigned char *)(*out_pp);
ocnt = *out_left_p;
trail_ws = 0;
for (;;) {
if (!(opts & PHP_CONV_QPRINT_OPT_BINARY) && inst->lbchars != NULL && inst->lbchars_len > 0) {
/* look ahead for the line break chars to make a right decision
* how to consume incoming characters */
if (icnt > 0 && *ps == inst->lbchars[lb_cnt]) {
lb_cnt++;
if (lb_cnt >= inst->lbchars_len) {
unsigned int i;
if (ocnt < lb_cnt) {
lb_cnt--;
err = PHP_CONV_ERR_TOO_BIG;
break;
}
for (i = 0; i < lb_cnt; i++) {
*(pd++) = inst->lbchars[i];
ocnt--;
}
line_ccnt = inst->line_len;
lb_ptr = lb_cnt = 0;
}
ps++, icnt--;
continue;
}
}
if (lb_ptr >= lb_cnt && icnt <= 0) {
break;
}
c = NEXT_CHAR(ps, icnt, lb_ptr, lb_cnt, inst->lbchars);
if (!(opts & PHP_CONV_QPRINT_OPT_BINARY) &&
(trail_ws == 0) &&
(c == '\t' || c == ' ')) {
if (line_ccnt < 2 && inst->lbchars != NULL) {
if (ocnt < inst->lbchars_len + 1) {
err = PHP_CONV_ERR_TOO_BIG;
break;
}
*(pd++) = '=';
ocnt--;
line_ccnt--;
memcpy(pd, inst->lbchars, inst->lbchars_len);
pd += inst->lbchars_len;
ocnt -= inst->lbchars_len;
line_ccnt = inst->line_len;
} else {
if (ocnt < 1) {
err = PHP_CONV_ERR_TOO_BIG;
break;
}
/* Check to see if this is EOL whitespace. */
if (inst->lbchars != NULL) {
unsigned char *ps2;
unsigned int j, lb_cnt2;
lb_cnt2 = 0;
ps2 = ps;
trail_ws = 1;
for (j = icnt - 1; j > 0; j--, ps2++) {
if (*ps2 == inst->lbchars[lb_cnt2]) {
lb_cnt2++;
if (lb_cnt2 >= inst->lbchars_len) {
/* Found trailing ws. Reset to top of main
* for loop to allow for code to do necessary
* wrapping/encoding. */
break;
}
} else if (lb_cnt2 != 0 || (*ps2 != '\t' && *ps2 != ' ')) {
/* At least one non-EOL character following, so
* don't need to encode ws. */
trail_ws = 0;
break;
} else {
trail_ws++;
}
}
}
if (trail_ws == 0) {
*(pd++) = c;
ocnt--;
line_ccnt--;
CONSUME_CHAR(ps, icnt, lb_ptr, lb_cnt);
}
}
} else if ((!(opts & PHP_CONV_QPRINT_OPT_FORCE_ENCODE_FIRST) || line_ccnt < inst->line_len) && ((c >= 33 && c <= 60) || (c >= 62 && c <= 126))) {
if (line_ccnt < 2 && inst->lbchars != NULL) {
if (ocnt < inst->lbchars_len + 1) {
err = PHP_CONV_ERR_TOO_BIG;
break;
}
*(pd++) = '=';
ocnt--;
line_ccnt--;
memcpy(pd, inst->lbchars, inst->lbchars_len);
pd += inst->lbchars_len;
ocnt -= inst->lbchars_len;
line_ccnt = inst->line_len;
}
if (ocnt < 1) {
err = PHP_CONV_ERR_TOO_BIG;
break;
}
*(pd++) = c;
ocnt--;
line_ccnt--;
CONSUME_CHAR(ps, icnt, lb_ptr, lb_cnt);
} else {
if (line_ccnt < 4) {
if (ocnt < inst->lbchars_len + 1) {
err = PHP_CONV_ERR_TOO_BIG;
break;
}
*(pd++) = '=';
ocnt--;
line_ccnt--;
memcpy(pd, inst->lbchars, inst->lbchars_len);
pd += inst->lbchars_len;
ocnt -= inst->lbchars_len;
line_ccnt = inst->line_len;
}
if (ocnt < 3) {
err = PHP_CONV_ERR_TOO_BIG;
break;
}
*(pd++) = '=';
*(pd++) = qp_digits[(c >> 4)];
*(pd++) = qp_digits[(c & 0x0f)];
ocnt -= 3;
line_ccnt -= 3;
if (trail_ws > 0) {
trail_ws--;
}
CONSUME_CHAR(ps, icnt, lb_ptr, lb_cnt);
}
}
*in_pp = (const char *)ps;
*in_left_p = icnt;
*out_pp = (char *)pd;
*out_left_p = ocnt;
inst->line_ccnt = line_ccnt;
inst->lb_ptr = lb_ptr;
inst->lb_cnt = lb_cnt;
return err;
}
#undef NEXT_CHAR
#undef CONSUME_CHAR
static php_conv_err_t php_conv_qprint_encode_ctor(php_conv_qprint_encode *inst, unsigned int line_len, const char *lbchars, size_t lbchars_len, int lbchars_dup, int opts, int persistent)
{
if (line_len < 4 && lbchars != NULL) {
return PHP_CONV_ERR_TOO_BIG;
}
inst->_super.convert_op = (php_conv_convert_func) php_conv_qprint_encode_convert;
inst->_super.dtor = (php_conv_dtor_func) php_conv_qprint_encode_dtor;
inst->line_ccnt = line_len;
inst->line_len = line_len;
if (lbchars != NULL) {
inst->lbchars = (lbchars_dup ? pestrdup(lbchars, persistent) : lbchars);
inst->lbchars_len = lbchars_len;
} else {
inst->lbchars = NULL;
}
inst->lbchars_dup = lbchars_dup;
inst->persistent = persistent;
inst->opts = opts;
inst->lb_cnt = inst->lb_ptr = 0;
return PHP_CONV_ERR_SUCCESS;
}
/* }}} */
/* {{{ php_conv_qprint_decode */
typedef struct _php_conv_qprint_decode {
php_conv _super;
int scan_stat;