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/* |
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* Copyright 2010 John-Mark Bell |
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* |
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* This file is part of NetSurf, http://www.netsurf-browser.org/ |
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* |
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* NetSurf is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; version 2 of the License. |
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* |
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* NetSurf is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see . |
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*/ |
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#include |
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#include |
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#include |
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#include |
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#include "utils/http/primitives.h" |
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/** |
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* Skip past linear whitespace in input |
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* |
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* \param input Pointer to current input byte. Updated on exit. |
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*/ |
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void http__skip_LWS(const char **input) |
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{ |
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const char *pos = *input; |
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while (*pos == ' ' || *pos == '\t') |
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pos++; |
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*input = pos; |
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} |
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/** |
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* Determine if a character is valid for an HTTP token |
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* |
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* \param c Character to consider |
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* \return True if character is valid, false otherwise |
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*/ |
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static bool http_is_token_char(uint8_t c) |
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{ |
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/* [ 32 - 126 ] except ()<>@,;:\"/[]?={} SP HT */ |
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if (c <= ' ' || 126 < c) |
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return false; |
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return (strchr("()<>@,;:\\\"/[]?={}", c) == NULL); |
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} |
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/** |
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* Parse an HTTP token |
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* |
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* \param input Pointer to current input byte. Updated on exit. |
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* \param value Pointer to location to receive on-heap token value. |
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* \return NSERROR_OK on success, |
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* NSERROR_NOMEM on memory exhaustion, |
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* NSERROR_NOT_FOUND if no token could be parsed |
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* |
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* The returned value is owned by the caller |
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*/ |
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nserror http__parse_token(const char **input, lwc_string **value) |
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{ |
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const uint8_t *start = (const uint8_t *) *input; |
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const uint8_t *end; |
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lwc_string *token; |
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end = start; |
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while (http_is_token_char(*end)) |
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end++; |
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if (end == start) |
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return NSERROR_NOT_FOUND; |
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if (lwc_intern_string((const char *) start, |
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end - start, &token) != lwc_error_ok) |
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return NSERROR_NOMEM; |
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*value = token; |
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*input = (const char *) end; |
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return NSERROR_OK; |
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} |
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/** |
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* Parse an HTTP quoted-string |
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* |
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* \param input Pointer to current input byte. Updated on exit. |
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* \param value Pointer to location to receive on-heap string value. |
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* \return NSERROR_OK on success, |
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* NSERROR_NOMEM on memory exhaustion, |
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* NSERROR_NOT_FOUND if no string could be parsed |
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* |
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* The returned value is owned by the caller |
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*/ |
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nserror http__parse_quoted_string(const char **input, lwc_string **value) |
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{ |
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const uint8_t *start = (const uint8_t *) *input; |
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const uint8_t *end; |
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uint8_t c; |
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lwc_string *string_value; |
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/* <"> *( qdtext | quoted-pair ) <"> |
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* qdtext = any TEXT except <"> |
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* quoted-pair = "\" CHAR |
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* TEXT = [ HT, CR, LF, 32-126, 128-255 ] |
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* CHAR = [ 0 - 127 ] |
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* |
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* \todo TEXT may contain non 8859-1 chars encoded per RFC 2047 |
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* \todo Support quoted-pairs |
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*/ |
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if (*start != '"') |
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return NSERROR_NOT_FOUND; |
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end = start = start + 1; |
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c = *end; |
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while (c == '\t' || c == '\r' || c == '\n' || |
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c == ' ' || c == '!' || |
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('#' <= c && c <= 126) || c > 127) { |
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end++; |
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c = *end; |
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} |
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if (*end != '"') |
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return NSERROR_NOT_FOUND; |
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if (lwc_intern_string((const char *) start, end - start, |
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&string_value) != lwc_error_ok) |
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return NSERROR_NOMEM; |
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*value = string_value; |
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*input = (const char *) end + 1; |
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return NSERROR_OK; |
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} |
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