+/* Mime constants and macros */
+#define MIME_VERSION "MIME-Version: "
+#define MIME_VERSION_LEN 14
+#define MIME_CONTENT_TYPE "Content-Type: "
+#define MIME_CONTENT_TYPE_LEN 14
+#define MIME_TRANSFER_ENCODING "Content-Transfer-Encoding: "
+#define MIME_TRANSFER_ENCODING_LEN 27
+
+#define MIME_GET_FIELD(mime, mime_len, field, field_len, \
+ dest, dest_size) \
+do { \
+ if (dest) { \
+ char *f = strstr(mime, field); \
+ if (f) { \
+ int parse_len; \
+ f += field_len; \
+ parse_len = (mime_len - (f - (char *)mime)); \
+ for (i = 0; i < parse_len; i++) { \
+ if ((i == dest_size) || \
+ ((f[i] == '\n') && \
+ ((i == parse_len - 1) || \
+ ((f[i+1] != ' ') && (f[i+1] != '\t')))) || \
+ ((f[i] == '\r') && \
+ ((i == parse_len - 1) || (f[i+1] == '\n')) && \
+ ((i >= parse_len - 2) || \
+ ((f[i+2] != ' ') && (f[i+2] != '\t'))))) \
+ break; \
+ dest[i] = f[i]; \
+ } \
+ } \
+ } \
+} while(0)
+
+/* Parses MIME object and MIME header in it. */
+
+bool
+silc_mime_parse(const unsigned char *mime, SilcUInt32 mime_len,
+ char *version, SilcUInt32 version_size,
+ char *content_type, SilcUInt32 content_type_size,
+ char *transfer_encoding, SilcUInt32 transfer_encoding_size,
+ unsigned char **mime_data_ptr, SilcUInt32 *mime_data_len)
+{
+ int i;
+ unsigned char *tmp;
+
+ /* Get the pointer to the data area in the object */
+ for (i = 0; i < mime_len; i++) {
+ if ((mime_len >= i + 4 &&
+ mime[i ] == '\r' && mime[i + 1] == '\n' &&
+ mime[i + 2] == '\r' && mime[i + 3] == '\n') ||
+ (mime_len >= i + 2 &&
+ mime[i ] == '\n' && mime[i + 1] == '\n'))
+ break;
+ }
+ if (i >= mime_len)
+ return FALSE;
+
+ if (mime_data_ptr)
+ *mime_data_ptr = (unsigned char *)mime + i +
+ (mime[i] == '\n' ? 2 : 4);
+ if (mime_data_len)
+ *mime_data_len = mime_len - (i + (mime[i] == '\n' ? 2 : 4));
+
+ /* Check for mandatory Content-Type field */
+ tmp = strstr(mime, MIME_CONTENT_TYPE);
+ if (!tmp || (tmp - mime) >= i)
+ return FALSE;
+
+ /* Get MIME version, Content-Type and Transfer Encoding fields */
+ MIME_GET_FIELD(mime, mime_len,
+ MIME_VERSION, MIME_VERSION_LEN,
+ version, version_size);
+ MIME_GET_FIELD(mime, mime_len,
+ MIME_CONTENT_TYPE, MIME_CONTENT_TYPE_LEN,
+ content_type, content_type_size);
+ MIME_GET_FIELD(mime, mime_len,
+ MIME_TRANSFER_ENCODING, MIME_TRANSFER_ENCODING_LEN,
+ transfer_encoding, transfer_encoding_size);
+
+ return TRUE;
+}
+
+/* Concatenates the `src' into `dest'. If `src_len' is more than the
+ size of the `dest' (minus NULL at the end) the `src' will be
+ truncated to fit. */