From b34502af8247606ae3b5693cd3046566b16a3e6d Mon Sep 17 00:00:00 2001
From: John Mark Bell <jmb@netsurf-browser.org>
Date: Fri, 8 Jul 2011 08:38:17 +0000
Subject: Refactor http utilities

svn path=/trunk/netsurf/; revision=12595
---
 utils/http/primitives.c | 146 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 utils/http/primitives.c

(limited to 'utils/http/primitives.c')

diff --git a/utils/http/primitives.c b/utils/http/primitives.c
new file mode 100644
index 000000000..f4c4e056e
--- /dev/null
+++ b/utils/http/primitives.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2010 John-Mark Bell <jmb@netsurf-browser.org>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "utils/http/primitives.h"
+
+/**
+ * Skip past linear whitespace in input
+ *
+ * \param input  Pointer to current input byte. Updated on exit.
+ */
+void http__skip_LWS(const char **input)
+{
+	const char *pos = *input;
+
+	while (*pos == ' ' || *pos == '\t')
+		pos++;
+
+	*input = pos;
+}
+
+/**
+ * Determine if a character is valid for an HTTP token
+ *
+ * \param c  Character to consider
+ * \return True if character is valid, false otherwise
+ */
+static bool http_is_token_char(uint8_t c)
+{
+	/* [ 32 - 126 ] except ()<>@,;:\"/[]?={} SP HT */
+
+	if (c <= ' ' || 126 < c)
+		return false;
+
+	return (strchr("()<>@,;:\\\"/[]?={}", c) == NULL);
+}
+
+/**
+ * Parse an HTTP token
+ *
+ * \param input  Pointer to current input byte. Updated on exit.
+ * \param value  Pointer to location to receive on-heap token value.
+ * \return NSERROR_OK on success,
+ * 	   NSERROR_NOMEM on memory exhaustion,
+ * 	   NSERROR_NOT_FOUND if no token could be parsed
+ *
+ * The returned value is owned by the caller
+ */
+nserror http__parse_token(const char **input, lwc_string **value)
+{
+	const uint8_t *start = (const uint8_t *) *input;
+	const uint8_t *end;
+	lwc_string *token;
+
+	end = start;
+	while (http_is_token_char(*end))
+		end++;
+
+	if (end == start)
+		return NSERROR_NOT_FOUND;
+
+	if (lwc_intern_string((const char *) start, 
+			end - start, &token) != lwc_error_ok)
+		return NSERROR_NOMEM;
+
+	*value = token;
+	*input = (const char *) end;
+
+	return NSERROR_OK;
+}
+
+/**
+ * Parse an HTTP quoted-string
+ *
+ * \param input  Pointer to current input byte. Updated on exit.
+ * \param value  Pointer to location to receive on-heap string value.
+ * \return NSERROR_OK on success,
+ * 	   NSERROR_NOMEM on memory exhaustion,
+ * 	   NSERROR_NOT_FOUND if no string could be parsed
+ *
+ * The returned value is owned by the caller
+ */
+nserror http__parse_quoted_string(const char **input, lwc_string **value)
+{
+	const uint8_t *start = (const uint8_t *) *input;
+	const uint8_t *end;
+	uint8_t c;
+	lwc_string *string_value;
+
+	/* <"> *( qdtext | quoted-pair ) <">
+	 * qdtext = any TEXT except <">
+	 * quoted-pair = "\" CHAR
+	 * TEXT = [ HT, CR, LF, 32-126, 128-255 ]
+	 * CHAR = [ 0 - 127 ]
+	 *
+	 * \todo TEXT may contain non 8859-1 chars encoded per RFC 2047
+	 * \todo Support quoted-pairs
+	 */
+
+	if (*start != '"')
+		return NSERROR_NOT_FOUND;
+
+	end = start = start + 1;
+
+	c = *end;
+	while (c == '\t' || c == '\r' || c == '\n' || 
+			c == ' ' || c == '!' ||
+			('#' <= c && c <= 126) || c > 127) {
+		end++;
+		c = *end;
+	}
+
+	if (*end != '"')
+		return NSERROR_NOT_FOUND;
+
+	if (lwc_intern_string((const char *) start, end - start, 
+			&string_value) != lwc_error_ok)
+		return NSERROR_NOMEM;
+
+	*value = string_value;
+
+	*input = (const char *) end + 1;
+
+	return NSERROR_OK;
+}
+
+
-- 
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