diff options
Diffstat (limited to 'src/input/filter.c')
-rw-r--r-- | src/input/filter.c | 380 |
1 files changed, 0 insertions, 380 deletions
diff --git a/src/input/filter.c b/src/input/filter.c deleted file mode 100644 index 7a97840..0000000 --- a/src/input/filter.c +++ /dev/null @@ -1,380 +0,0 @@ -/* - * 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 <errno.h> -#include <stdbool.h> -#include <stdlib.h> -#include <string.h> - -#include "charset/aliases.h" -#include "charset/codec.h" -#include "utils/utils.h" - -#include "input/filter.h" - - -/** Input filter */ -struct hubbub_filter { - hubbub_charsetcodec *read_codec; /**< Read codec */ - hubbub_charsetcodec *write_codec; /**< Write codec */ - - uint32_t filter_output[2]; /**< Filter output buffer */ - uint32_t last_filter_char; /**< Last filtered character */ - - 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 */ - - struct { - uint16_t encoding; /**< Input encoding */ - } settings; /**< Filter settings */ - - hubbub_alloc alloc; /**< Memory (de)allocation function */ - void *pw; /**< Client private data */ -}; - -static hubbub_error hubbub_filter_set_defaults(hubbub_filter *input); -static hubbub_error hubbub_filter_set_encoding(hubbub_filter *input, - const char *enc); -static hubbub_error read_character_filter(uint32_t c, - uint32_t **output, size_t *outputlen, void *pw); - -/** - * 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) - * \return Pointer to filter instance, or NULL on failure - */ -hubbub_filter *hubbub_filter_create(const char *int_enc, - hubbub_alloc alloc, void *pw) -{ - hubbub_filter *filter; - - if (alloc == NULL) - return NULL; - - filter = alloc(NULL, sizeof(*filter), pw); - if (!filter) - return NULL; - - filter->last_filter_char = 0; - - filter->leftover = false; - filter->pivot_left = NULL; - filter->pivot_len = 0; - - filter->alloc = alloc; - filter->pw = pw; - - if (hubbub_filter_set_defaults(filter) != HUBBUB_OK) { - filter->alloc(filter, 0, pw); - return NULL; - } - - filter->write_codec = hubbub_charsetcodec_create(int_enc, alloc, pw); - if (filter->write_codec == NULL) { - if (filter->read_codec != NULL) - hubbub_charsetcodec_destroy(filter->read_codec); - filter->alloc(filter, 0, pw); - return NULL; - } - - return filter; -} - -/** - * Destroy an input filter - * - * \param input Pointer to filter instance - */ -void hubbub_filter_destroy(hubbub_filter *input) -{ - if (input == NULL) - return; - - if (input->read_codec != NULL) - hubbub_charsetcodec_destroy(input->read_codec); - - if (input->write_codec != NULL) - hubbub_charsetcodec_destroy(input->write_codec); - - input->alloc(input, 0, input->pw); - - return; -} - -/** - * Configure an input filter - * - * \param input Pointer to filter instance - * \param type Input option type to configure - * \param params Option-specific parameters - * \return HUBBUB_OK on success, appropriate error otherwise - */ -hubbub_error hubbub_filter_setopt(hubbub_filter *input, - hubbub_filter_opttype type, - hubbub_filter_optparams *params) -{ - hubbub_error error = HUBBUB_OK; - - if (input == NULL || params == NULL) - return HUBBUB_BADPARM; - - switch (type) { - case HUBBUB_FILTER_SET_ENCODING: - error = hubbub_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 HUBBUB_OK on success, appropriate error otherwise - * - * Call this with an input buffer length of 0 to flush any buffers. - */ -hubbub_error hubbub_filter_process_chunk(hubbub_filter *input, - const uint8_t **data, size_t *len, - uint8_t **output, size_t *outlen) -{ - hubbub_error read_error, write_error; - - if (input == NULL || data == NULL || *data == NULL || len == NULL || - output == NULL || *output == NULL || outlen == NULL) - return HUBBUB_BADPARM; - - if (input->leftover) { - /* Some data left to be written from last call */ - - /* Attempt to flush the remaining data. */ - write_error = hubbub_charsetcodec_encode(input->write_codec, - (const uint8_t **) &input->pivot_left, - &input->pivot_len, - output, outlen); - - if (write_error != HUBBUB_OK) { - return write_error; - } - - /* And clear leftover */ - input->pivot_left = NULL; - input->pivot_len = 0; - input->leftover = false; - } - - while (*len > 0) { - size_t pivot_len = sizeof(input->pivot_buf); - uint8_t *pivot = (uint8_t *) input->pivot_buf; - - read_error = hubbub_charsetcodec_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 = hubbub_charsetcodec_encode( - input->write_codec, - (const uint8_t **) &pivot, - &pivot_len, - output, outlen); - - if (write_error != HUBBUB_OK) { - input->leftover = true; - input->pivot_left = pivot; - input->pivot_len = pivot_len; - - return write_error; - } - } - - if (read_error != HUBBUB_OK && read_error != HUBBUB_NOMEM) - return read_error; - } - - return HUBBUB_OK; -} - -/** - * Reset an input filter's state - * - * \param input The input filter to reset - * \param HUBBUB_OK on success, appropriate error otherwise - */ -hubbub_error hubbub_filter_reset(hubbub_filter *input) -{ - hubbub_error error; - - if (input == NULL) - return HUBBUB_BADPARM; - - /* Clear pivot buffer leftovers */ - input->pivot_left = NULL; - input->pivot_len = 0; - input->leftover = false; - - /* Reset read codec */ - error = hubbub_charsetcodec_reset(input->read_codec); - if (error != HUBBUB_OK) - return error; - - /* Reset write codec */ - error = hubbub_charsetcodec_reset(input->write_codec); - if (error != HUBBUB_OK) - return error; - - return HUBBUB_OK; -} - -/** - * Set an input filter's default settings - * - * \param input Input filter to configure - * \return HUBBUB_OK on success, appropriate error otherwise - */ -hubbub_error hubbub_filter_set_defaults(hubbub_filter *input) -{ - hubbub_error error; - - if (input == NULL) - return HUBBUB_BADPARM; - - input->read_codec = NULL; - input->write_codec = NULL; - input->settings.encoding = 0; - error = hubbub_filter_set_encoding(input, "ISO-8859-1"); - if (error != HUBBUB_OK) - return error; - - return HUBBUB_OK; -} - -/** - * Set an input filter's encoding - * - * \param input Input filter to configure - * \param enc Encoding name - * \return HUBBUB_OK on success, appropriate error otherwise - */ -hubbub_error hubbub_filter_set_encoding(hubbub_filter *input, - const char *enc) -{ - const char *old_enc; - uint16_t mibenum; - hubbub_error error; - hubbub_charsetcodec_optparams params; - - if (input == NULL || enc == NULL) - return HUBBUB_BADPARM; - - mibenum = hubbub_mibenum_from_name(enc, strlen(enc)); - if (mibenum == 0) - return HUBBUB_INVALID; - - /* Exit early if we're already using this encoding */ - if (input->settings.encoding == mibenum) - return HUBBUB_OK; - - old_enc = hubbub_mibenum_to_name(input->settings.encoding); - if (old_enc == NULL) - old_enc = "ISO-8859-1"; - - if (input->read_codec != NULL) - hubbub_charsetcodec_destroy(input->read_codec); - - input->read_codec = hubbub_charsetcodec_create(enc, input->alloc, - input->pw); - if (input->read_codec == NULL) - return HUBBUB_NOMEM; - - /* Register filter function */ - params.filter_func.filter = read_character_filter; - params.filter_func.pw = (void *) input; - error = hubbub_charsetcodec_setopt(input->read_codec, - HUBBUB_CHARSETCODEC_FILTER_FUNC, - (hubbub_charsetcodec_optparams *) ¶ms); - if (error != HUBBUB_OK) - return error; - - input->settings.encoding = mibenum; - - return HUBBUB_OK; -} - -/** - * Character filter function for read characters - * - * \param c The read character (UCS4 - host byte order) - * \param output Pointer to pointer to output buffer (filled on exit) - * \param outputlen Pointer to output buffer length (filled on exit) - * \param pw Pointer to client-specific private data. - * \return HUBBUB_OK on success, appropriate error otherwise - */ -hubbub_error read_character_filter(uint32_t c, uint32_t **output, - size_t *outputlen, void *pw) -{ - hubbub_filter *input = (hubbub_filter *) pw; - size_t len; - - if (output == NULL || outputlen == NULL || pw == NULL) - return HUBBUB_BADPARM; - - /* Line ending normalisation: - * CRLF -> LF (trap CR and let LF through unmodified) - * CR -> LF (trap CR and convert to LF if not CRLF) - * LF -> LF (leave LF alone) - */ - -#define NUL (0x00000000) -#define CR (0x0000000D) -#define LF (0x0000000A) -#define REP (0x0000FFFD) - - /* Replace NUL (U+0000) characters in input with U+FFFD */ - if (c == NUL) - c = REP; - - if (c == CR) { - /* Convert CRs to LFs straight away */ - input->filter_output[0] = LF; - len = 1; - } else if (input->last_filter_char == CR && c == LF) { - /* Trap this LF */ - len = 0; - } else { - /* Let character through unchanged */ - input->filter_output[0] = c; - len = 1; - } - - -#undef NUL -#undef CR -#undef LF -#undef REP - - input->last_filter_char = c; - - *output = input->filter_output; - *outputlen = len; - - return HUBBUB_OK; -} |