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Diffstat (limited to 'src/charset/codec.c')
| -rw-r--r-- | src/charset/codec.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/charset/codec.c b/src/charset/codec.c new file mode 100644 index 0000000..5c3fb3a --- /dev/null +++ b/src/charset/codec.c @@ -0,0 +1,185 @@ +/* + * 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 <string.h> + +#include "charset/aliases.h" +#include "charset/codecs/codec_impl.h" + +#ifdef WITH_ICONV_CODEC +extern parserutils_charset_handler iconv_codec_handler; +#endif + +extern parserutils_charset_handler charset_utf8_codec_handler; +extern parserutils_charset_handler charset_utf16_codec_handler; + +static parserutils_charset_handler *handler_table[] = { + &charset_utf8_codec_handler, + &charset_utf16_codec_handler, +#ifdef WITH_ICONV_CODEC + &iconv_codec_handler, +#endif + 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 + */ +parserutils_charset_codec *parserutils_charset_codec_create(const char *charset, + parserutils_alloc alloc, void *pw) +{ + parserutils_charset_codec *codec; + parserutils_charset_handler **handler; + const parserutils_charset_aliases_canon * canon; + + if (charset == NULL || alloc == NULL) + return NULL; + + /* Canonicalise parserutils_charset name. */ + canon = parserutils_charset_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->errormode = PARSERUTILS_CHARSET_CODEC_ERROR_LOOSE; + + codec->alloc = alloc; + codec->alloc_pw = pw; + + return codec; +} + +/** + * Destroy a charset codec + * + * \param codec The codec to destroy + */ +void parserutils_charset_codec_destroy(parserutils_charset_codec *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 PARSERUTILS_OK on success, appropriate error otherwise + */ +parserutils_error parserutils_charset_codec_setopt( + parserutils_charset_codec *codec, + parserutils_charset_codec_opttype type, + parserutils_charset_codec_optparams *params) +{ + if (codec == NULL || params == NULL) + return PARSERUTILS_BADPARM; + + switch (type) { + case PARSERUTILS_CHARSET_CODEC_ERROR_MODE: + codec->errormode = params->error_mode.mode; + break; + } + + return PARSERUTILS_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 PARSERUTILS_OK on success, appropriate error otherwise. + * + * source, sourcelen, dest and destlen will be updated appropriately on exit + */ +parserutils_error parserutils_charset_codec_encode( + parserutils_charset_codec *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 PARSERUTILS_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 PARSERUTILS_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. + */ +parserutils_error parserutils_charset_codec_decode( + parserutils_charset_codec *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 PARSERUTILS_BADPARM; + + return codec->handler.decode(codec, source, sourcelen, dest, destlen); +} + +/** + * Clear a charset codec's encoding state + * + * \param codec The codec to reset + * \return PARSERUTILS_OK on success, appropriate error otherwise + */ +parserutils_error parserutils_charset_codec_reset( + parserutils_charset_codec *codec) +{ + if (codec == NULL) + return PARSERUTILS_BADPARM; + + return codec->handler.reset(codec); +} + |