+++ /dev/null
-/* message.c - Utility functions for parsing an email message for notmuch.
- *
- * Copyright © 2009 Carl Worth
- *
- * This program 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, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program 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/ .
- *
- * Author: Carl Worth <cworth@cworth.org>
- */
-
-#include <stdarg.h>
-
-#include "notmuch-private.h"
-
-#include <glib.h> /* GHashTable */
-
-typedef struct {
- char *str;
- size_t size;
- size_t len;
-} header_value_closure_t;
-
-struct _notmuch_message {
- /* File object */
- FILE *file;
-
- /* Header storage */
- int restrict_headers;
- GHashTable *headers;
- int broken_headers;
- int good_headers;
-
- /* Parsing state */
- char *line;
- size_t line_size;
- header_value_closure_t value;
-
- int parsing_started;
- int parsing_finished;
-};
-
-static int
-strcase_equal (const void *a, const void *b)
-{
- return strcasecmp (a, b) == 0;
-}
-
-static unsigned int
-strcase_hash (const void *ptr)
-{
- const char *s = ptr;
-
- /* This is the djb2 hash. */
- unsigned int hash = 5381;
- while (s && *s) {
- hash = ((hash << 5) + hash) + tolower (*s);
- s++;
- }
-
- return hash;
-}
-
-notmuch_message_t *
-notmuch_message_open (const char *filename)
-{
- notmuch_message_t *message;
-
- message = xcalloc (1, sizeof (notmuch_message_t));
-
- message->file = fopen (filename, "r");
- if (message->file == NULL)
- goto FAIL;
-
- message->headers = g_hash_table_new_full (strcase_hash,
- strcase_equal,
- free,
- free);
-
- message->parsing_started = 0;
- message->parsing_finished = 0;
-
- return message;
-
- FAIL:
- fprintf (stderr, "Error opening %s: %s\n", filename, strerror (errno));
- notmuch_message_close (message);
-
- return NULL;
-}
-
-void
-notmuch_message_close (notmuch_message_t *message)
-{
- if (message == NULL)
- return;
-
- if (message->line)
- free (message->line);
-
- if (message->value.size)
- free (message->value.str);
-
- if (message->headers)
- g_hash_table_destroy (message->headers);
-
- if (message->file)
- fclose (message->file);
-
- free (message);
-}
-
-void
-notmuch_message_restrict_headersv (notmuch_message_t *message,
- va_list va_headers)
-{
- char *header;
-
- if (message->parsing_started ) {
- fprintf (stderr, "Error: notmuch_message_restrict_headers called after parsing has started\n");
- exit (1);
- }
-
- while (1) {
- header = va_arg (va_headers, char*);
- if (header == NULL)
- break;
- g_hash_table_insert (message->headers,
- xstrdup (header), NULL);
- }
-
- message->restrict_headers = 1;
-}
-
-void
-notmuch_message_restrict_headers (notmuch_message_t *message, ...)
-{
- va_list va_headers;
-
- va_start (va_headers, message);
-
- notmuch_message_restrict_headersv (message, va_headers);
-}
-
-void
-copy_header_unfolding (header_value_closure_t *value,
- const char *chunk)
-{
- char *last;
-
- if (chunk == NULL)
- return;
-
- while (*chunk == ' ' || *chunk == '\t')
- chunk++;
-
- if (value->len + 1 + strlen (chunk) + 1 > value->size) {
- int new_size = value->size;
- if (value->size == 0)
- new_size = strlen (chunk) + 1;
- else
- while (value->len + 1 + strlen (chunk) + 1 > new_size)
- new_size *= 2;
- value->str = xrealloc (value->str, new_size);
- value->size = new_size;
- }
-
- last = value->str + value->len;
- if (value->len) {
- *last = ' ';
- last++;
- value->len++;
- }
-
- strcpy (last, chunk);
- value->len += strlen (chunk);
-
- last = value->str + value->len - 1;
- if (*last == '\n') {
- *last = '\0';
- value->len--;
- }
-}
-
-const char *
-notmuch_message_get_header (notmuch_message_t *message,
- const char *header_desired)
-{
- int contains;
- char *header, *value;
- const char *s, *colon;
- int match;
-
- message->parsing_started = 1;
-
- contains = g_hash_table_lookup_extended (message->headers,
- header_desired, NULL,
- (gpointer *) &value);
- if (contains && value)
- return value;
-
- if (message->parsing_finished)
- return NULL;
-
-#define NEXT_HEADER_LINE(closure) \
- do { \
- ssize_t bytes_read = getline (&message->line, \
- &message->line_size, \
- message->file); \
- if (bytes_read == -1) { \
- message->parsing_finished = 1; \
- break; \
- } \
- if (*message->line == '\n') { \
- message->parsing_finished = 1; \
- break; \
- } \
- if (closure && \
- (*message->line == ' ' || *message->line == '\t')) \
- { \
- copy_header_unfolding ((closure), message->line); \
- } \
- } while (*message->line == ' ' || *message->line == '\t');
-
- if (message->line == NULL)
- NEXT_HEADER_LINE (NULL);
-
- while (1) {
-
- if (message->parsing_finished)
- break;
-
- colon = strchr (message->line, ':');
-
- if (colon == NULL) {
- message->broken_headers++;
- /* A simple heuristic for giving up on things that just
- * don't look like mail messages. */
- if (message->broken_headers >= 10 &&
- message->good_headers < 5)
- {
- message->parsing_finished = 1;
- continue;
- }
- NEXT_HEADER_LINE (NULL);
- continue;
- }
-
- message->good_headers++;
-
- header = xstrndup (message->line, colon - message->line);
-
- if (message->restrict_headers &&
- ! g_hash_table_lookup_extended (message->headers,
- header, NULL, NULL))
- {
- free (header);
- NEXT_HEADER_LINE (NULL);
- continue;
- }
-
- s = colon + 1;
- while (*s == ' ' || *s == '\t')
- s++;
-
- message->value.len = 0;
- copy_header_unfolding (&message->value, s);
-
- NEXT_HEADER_LINE (&message->value);
-
- match = (strcasecmp (header, header_desired) == 0);
-
- value = xstrdup (message->value.str);
-
- g_hash_table_insert (message->headers, header, value);
-
- if (match)
- return value;
- }
-
- if (message->line)
- free (message->line);
- message->line = NULL;
-
- if (message->value.size) {
- free (message->value.str);
- message->value.str = NULL;
- message->value.size = 0;
- message->value.len = 0;
- }
-
- return NULL;
-}
projects / notmuch / blobdiff