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/*
* This file is part of LibParserUtils.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2007 John-Mark Bell <jmb@netsurf-browser.org>
*/
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#ifndef WITHOUT_ICONV_FILTER
#include <iconv.h>
#endif
#include <parserutils/charset/mibenum.h>
#include <parserutils/charset/codec.h>
#include "input/filter.h"
#include "utils/utils.h"
/** Input filter */
struct parserutils_filter {
#ifndef WITHOUT_ICONV_FILTER
iconv_t cd; /**< Iconv conversion descriptor */
uint16_t int_enc; /**< The internal encoding */
#else
parserutils_charset_codec *read_codec; /**< Read codec */
parserutils_charset_codec *write_codec; /**< Write codec */
uint32_t pivot_buf[64]; /**< Conversion pivot buffer */
bool leftover; /**< Data remains from last call */
uint8_t *pivot_left; /**< Remaining pivot to write */
size_t pivot_len; /**< Length of pivot remaining */
#endif
struct {
uint16_t encoding; /**< Input encoding */
} settings; /**< Filter settings */
parserutils_alloc alloc; /**< Memory (de)allocation function */
void *pw; /**< Client private data */
};
static parserutils_error filter_set_defaults(parserutils_filter *input);
static parserutils_error filter_set_encoding(parserutils_filter *input,
const char *enc);
/**
* Create an input filter
*
* \param int_enc Desired encoding of document
* \param alloc Function used to (de)allocate data
* \param pw Pointer to client-specific private data (may be NULL)
* \param filter Pointer to location to receive filter instance
* \return PARSERUTILS_OK on success,
* PARSERUTILS_BADPARM on bad parameters,
* PARSERUTILS_NOMEM on memory exhausion,
* PARSERUTILS_BADENCODING if the encoding is unsupported
*/
parserutils_error parserutils__filter_create(const char *int_enc,
parserutils_alloc alloc, void *pw, parserutils_filter **filter)
{
parserutils_filter *f;
parserutils_error error;
if (int_enc == NULL || alloc == NULL || filter == NULL)
return PARSERUTILS_BADPARM;
f = alloc(NULL, sizeof(parserutils_filter), pw);
if (f == NULL)
return PARSERUTILS_NOMEM;
#ifndef WITHOUT_ICONV_FILTER
f->cd = (iconv_t) -1;
f->int_enc = parserutils_charset_mibenum_from_name(
int_enc, strlen(int_enc));
if (f->int_enc == 0) {
alloc(f, 0, pw);
return PARSERUTILS_BADENCODING;
}
#else
f->leftover = false;
f->pivot_left = NULL;
f->pivot_len = 0;
#endif
f->alloc = alloc;
f->pw = pw;
error = filter_set_defaults(f);
if (error != PARSERUTILS_OK) {
f->alloc(f, 0, pw);
return error;
}
#ifdef WITHOUT_ICONV_FILTER
error = parserutils_charset_codec_create(int_enc, alloc, pw,
&f->write_codec);
if (error != PARSERUTILS_OK) {
if (f->read_codec != NULL) {
parserutils_charset_codec_destroy(f->read_codec);
f->read_codec = NULL;
}
f->alloc(f, 0, pw);
return error;
}
#endif
*filter = f;
return PARSERUTILS_OK;
}
/**
* Destroy an input filter
*
* \param input Pointer to filter instance
* \return PARSERUTILS_OK on success, appropriate error otherwise
*/
parserutils_error parserutils__filter_destroy(parserutils_filter *input)
{
if (input == NULL)
return PARSERUTILS_BADPARM;
#ifndef WITHOUT_ICONV_FILTER
if (input->cd != (iconv_t) -1) {
iconv_close(input->cd);
input->cd = (iconv_t) -1;
}
#else
if (input->read_codec != NULL) {
parserutils_charset_codec_destroy(input->read_codec);
input->read_codec = NULL;
}
if (input->write_codec != NULL) {
parserutils_charset_codec_destroy(input->write_codec);
input->write_codec = NULL;
}
#endif
input->alloc(input, 0, input->pw);
return PARSERUTILS_OK;
}
/**
* Configure an input filter
*
* \param input Pointer to filter instance
* \param type Input option type to configure
* \param params Option-specific parameters
* \return PARSERUTILS_OK on success, appropriate error otherwise
*/
parserutils_error parserutils__filter_setopt(parserutils_filter *input,
parserutils_filter_opttype type,
parserutils_filter_optparams *params)
{
parserutils_error error = PARSERUTILS_OK;
if (input == NULL || params == NULL)
return PARSERUTILS_BADPARM;
switch (type) {
case PARSERUTILS_FILTER_SET_ENCODING:
error = filter_set_encoding(input, params->encoding.name);
break;
}
return error;
}
/**
* Process a chunk of data
*
* \param input Pointer to filter instance
* \param data Pointer to pointer to input buffer
* \param len Pointer to length of input buffer
* \param output Pointer to pointer to output buffer
* \param outlen Pointer to length of output buffer
* \return PARSERUTILS_OK on success, appropriate error otherwise
*
* Call this with an input buffer length of 0 to flush any buffers.
*/
parserutils_error parserutils__filter_process_chunk(parserutils_filter *input,
const uint8_t **data, size_t *len,
uint8_t **output, size_t *outlen)
{
if (input == NULL || data == NULL || *data == NULL || len == NULL ||
output == NULL || *output == NULL || outlen == NULL)
return PARSERUTILS_BADPARM;
#ifndef WITHOUT_ICONV_FILTER
if (iconv(input->cd, (void *) data, len,
(char **) output, outlen) == (size_t) -1) {
switch (errno) {
case E2BIG:
return PARSERUTILS_NOMEM;
case EILSEQ:
if (*outlen < 3)
return PARSERUTILS_NOMEM;
(*output)[0] = 0xef;
(*output)[1] = 0xbf;
(*output)[2] = 0xbd;
*output += 3;
*outlen -= 3;
(*data)++;
(*len)--;
while (*len > 0) {
size_t ret;
ret = iconv(input->cd, (void *) data, len,
(char **) output, outlen);
if (ret != (size_t) -1 || errno != EILSEQ)
break;
if (*outlen < 3)
return PARSERUTILS_NOMEM;
(*output)[0] = 0xef;
(*output)[1] = 0xbf;
(*output)[2] = 0xbd;
*output += 3;
*outlen -= 3;
(*data)++;
(*len)--;
}
return errno == E2BIG ? PARSERUTILS_NOMEM
: PARSERUTILS_OK;
}
}
return PARSERUTILS_OK;
#else
if (input->leftover) {
parserutils_error write_error;
/* Some data left to be written from last call */
/* Attempt to flush the remaining data. */
write_error = parserutils_charset_codec_encode(
input->write_codec,
(const uint8_t **) &input->pivot_left,
&input->pivot_len,
output, outlen);
if (write_error != PARSERUTILS_OK)
return write_error;
/* And clear leftover */
input->pivot_left = NULL;
input->pivot_len = 0;
input->leftover = false;
}
while (*len > 0) {
parserutils_error read_error, write_error;
size_t pivot_len = sizeof(input->pivot_buf);
uint8_t *pivot = (uint8_t *) input->pivot_buf;
read_error = parserutils_charset_codec_decode(input->read_codec,
data, len,
(uint8_t **) &pivot, &pivot_len);
pivot = (uint8_t *) input->pivot_buf;
pivot_len = sizeof(input->pivot_buf) - pivot_len;
if (pivot_len > 0) {
write_error = parserutils_charset_codec_encode(
input->write_codec,
(const uint8_t **) &pivot,
&pivot_len,
output, outlen);
if (write_error != PARSERUTILS_OK) {
input->leftover = true;
input->pivot_left = pivot;
input->pivot_len = pivot_len;
return write_error;
}
}
if (read_error != PARSERUTILS_OK &&
read_error != PARSERUTILS_NOMEM)
return read_error;
}
return PARSERUTILS_OK;
#endif
}
/**
* Reset an input filter's state
*
* \param input The input filter to reset
* \return PARSERUTILS_OK on success, appropriate error otherwise
*/
parserutils_error parserutils__filter_reset(parserutils_filter *input)
{
parserutils_error error = PARSERUTILS_OK;
if (input == NULL)
return PARSERUTILS_BADPARM;
#ifndef WITHOUT_ICONV_FILTER
iconv(input->cd, NULL, 0, NULL, 0);
#else
/* Clear pivot buffer leftovers */
input->pivot_left = NULL;
input->pivot_len = 0;
input->leftover = false;
/* Reset read codec */
error = parserutils_charset_codec_reset(input->read_codec);
if (error != PARSERUTILS_OK)
return error;
/* Reset write codec */
error = parserutils_charset_codec_reset(input->write_codec);
if (error != PARSERUTILS_OK)
return error;
#endif
return error;
}
/**
* Set an input filter's default settings
*
* \param input Input filter to configure
* \return PARSERUTILS_OK on success, appropriate error otherwise
*/
parserutils_error filter_set_defaults(parserutils_filter *input)
{
parserutils_error error;
if (input == NULL)
return PARSERUTILS_BADPARM;
#ifdef WITHOUT_ICONV_FILTER
input->read_codec = NULL;
input->write_codec = NULL;
#endif
input->settings.encoding = 0;
error = filter_set_encoding(input, "UTF-8");
if (error != PARSERUTILS_OK)
return error;
return PARSERUTILS_OK;
}
/**
* Set an input filter's encoding
*
* \param input Input filter to configure
* \param enc Encoding name
* \return PARSERUTILS_OK on success, appropriate error otherwise
*/
parserutils_error filter_set_encoding(parserutils_filter *input,
const char *enc)
{
parserutils_error error = PARSERUTILS_OK;
uint16_t mibenum;
if (input == NULL || enc == NULL)
return PARSERUTILS_BADPARM;
mibenum = parserutils_charset_mibenum_from_name(enc, strlen(enc));
if (mibenum == 0)
return PARSERUTILS_BADENCODING;
/* Exit early if we're already using this encoding */
if (input->settings.encoding == mibenum)
return PARSERUTILS_OK;
#ifndef WITHOUT_ICONV_FILTER
if (input->cd != (iconv_t) -1) {
iconv_close(input->cd);
input->cd = (iconv_t) -1;
}
input->cd = iconv_open(
parserutils_charset_mibenum_to_name(input->int_enc),
parserutils_charset_mibenum_to_name(mibenum));
if (input->cd == (iconv_t) -1) {
return (errno == EINVAL) ? PARSERUTILS_BADENCODING
: PARSERUTILS_NOMEM;
}
#else
if (input->read_codec != NULL) {
parserutils_charset_codec_destroy(input->read_codec);
input->read_codec = NULL;
}
error = parserutils_charset_codec_create(enc, input->alloc,
input->pw, &input->read_codec);
if (error != PARSERUTILS_OK)
return error;
#endif
input->settings.encoding = mibenum;
return error;
}
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