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/*
* This file is part of Hubbub.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2007 John-Mark Bell <jmb@netsurf-browser.org>
*/
#include <string.h>
#include "charset/aliases.h"
#include "codec_impl.h"
extern hubbub_charsethandler hubbub_iconv_codec_handler;
extern hubbub_charsethandler hubbub_utf8_codec_handler;
extern hubbub_charsethandler hubbub_utf16_codec_handler;
static hubbub_charsethandler *handler_table[] = {
&hubbub_utf8_codec_handler,
&hubbub_utf16_codec_handler,
&hubbub_iconv_codec_handler,
NULL,
};
/**
* Create a charset codec
*
* \param charset Target charset
* \param alloc Memory (de)allocation function
* \param pw Pointer to client-specific private data (may be NULL)
* \return Pointer to codec instance, or NULL on failure
*/
hubbub_charsetcodec *hubbub_charsetcodec_create(const char *charset,
hubbub_alloc alloc, void *pw)
{
hubbub_charsetcodec *codec;
hubbub_charsethandler **handler;
const hubbub_aliases_canon * canon;
if (charset == NULL || alloc == NULL)
return NULL;
/* Canonicalise charset name. */
canon = hubbub_alias_canonicalise(charset, strlen(charset));
if (canon == NULL)
return NULL;
/* Search for handler class */
for (handler = handler_table; *handler != NULL; handler++) {
if ((*handler)->handles_charset(canon->name))
break;
}
/* None found */
if ((*handler) == NULL)
return NULL;
/* Instantiate class */
codec = (*handler)->create(canon->name, alloc, pw);
if (codec == NULL)
return NULL;
/* and initialise it */
codec->mibenum = canon->mib_enum;
codec->filter = NULL;
codec->filter_pw = NULL;
codec->errormode = HUBBUB_CHARSETCODEC_ERROR_LOOSE;
codec->alloc = alloc;
codec->alloc_pw = pw;
return codec;
}
/**
* Destroy a charset codec
*
* \param codec The codec to destroy
*/
void hubbub_charsetcodec_destroy(hubbub_charsetcodec *codec)
{
if (codec == NULL)
return;
codec->handler.destroy(codec);
codec->alloc(codec, 0, codec->alloc_pw);
}
/**
* Configure a charset codec
*
* \param codec The codec to configure
* \parem type The codec option type to configure
* \param params Option-specific parameters
* \return HUBBUB_OK on success, appropriate error otherwise
*/
hubbub_error hubbub_charsetcodec_setopt(hubbub_charsetcodec *codec,
hubbub_charsetcodec_opttype type,
hubbub_charsetcodec_optparams *params)
{
if (codec == NULL || params == NULL)
return HUBBUB_BADPARM;
switch (type) {
case HUBBUB_CHARSETCODEC_FILTER_FUNC:
codec->filter = params->filter_func.filter;
codec->filter_pw = params->filter_func.pw;
break;
case HUBBUB_CHARSETCODEC_ERROR_MODE:
codec->errormode = params->error_mode.mode;
break;
}
return HUBBUB_OK;
}
/**
* Encode a chunk of UCS4 data into a codec's charset
*
* \param codec The codec to use
* \param source Pointer to pointer to source data
* \param sourcelen Pointer to length (in bytes) of source data
* \param dest Pointer to pointer to output buffer
* \param destlen Pointer to length (in bytes) of output buffer
* \return HUBBUB_OK on success, appropriate error otherwise.
*
* source, sourcelen, dest and destlen will be updated appropriately on exit
*/
hubbub_error hubbub_charsetcodec_encode(hubbub_charsetcodec *codec,
const uint8_t **source, size_t *sourcelen,
uint8_t **dest, size_t *destlen)
{
if (codec == NULL || source == NULL || *source == NULL ||
sourcelen == NULL || dest == NULL || *dest == NULL ||
destlen == NULL)
return HUBBUB_BADPARM;
return codec->handler.encode(codec, source, sourcelen, dest, destlen);
}
/**
* Decode a chunk of data in a codec's charset into UCS4
*
* \param codec The codec to use
* \param source Pointer to pointer to source data
* \param sourcelen Pointer to length (in bytes) of source data
* \param dest Pointer to pointer to output buffer
* \param destlen Pointer to length (in bytes) of output buffer
* \return HUBBUB_OK on success, appropriate error otherwise.
*
* source, sourcelen, dest and destlen will be updated appropriately on exit
*
* Call this with a source length of 0 to flush any buffers.
*/
hubbub_error hubbub_charsetcodec_decode(hubbub_charsetcodec *codec,
const uint8_t **source, size_t *sourcelen,
uint8_t **dest, size_t *destlen)
{
if (codec == NULL || source == NULL || *source == NULL ||
sourcelen == NULL || dest == NULL || *dest == NULL ||
destlen == NULL)
return HUBBUB_BADPARM;
return codec->handler.decode(codec, source, sourcelen, dest, destlen);
}
/**
* Clear a charset codec's encoding state
*
* \param codec The codec to reset
* \return HUBBUB_OK on success, appropriate error otherwise
*/
hubbub_error hubbub_charsetcodec_reset(hubbub_charsetcodec *codec)
{
if (codec == NULL)
return HUBBUB_BADPARM;
/* Reset filter */
if (codec->filter)
codec->filter(HUBBUB_CHARSETCODEC_NULL, NULL, NULL, NULL);
return codec->handler.reset(codec);
}
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