If the recording in the database is too large, it will fail to retrieve with

an mmap error.  Not too sure why this doesn't happen when we put it in the
database, also, but since that doesn't seem to be broken, I'm not going to fix
it (at least until someone reports it).  Solution is to ask for the file in
smaller chunks.  (Bug 8385)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@48251 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_voicemail.c

@@ -77,6 +77,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #define COMMAND_TIMEOUT 5000
 #define	VOICEMAIL_DIR_MODE	0700
 #define	VOICEMAIL_FILE_MODE	0600
+#define	CHUNKSIZE	65536
 
 #define VOICEMAIL_CONFIG "voicemail.conf"
 #define ASTERISK_USERNAME "asterisk"
@@ -925,6 +926,7 @@ static int retrieve_file(char *dir, int msgnum)
 				goto yuck;
 			}
 			if (!strcasecmp(coltitle, "recording")) {
+				off_t offset;
 				res = SQLGetData(stmt, x + 1, SQL_BINARY, NULL, 0, &colsize);
 				fdlen = colsize;
 				if (fd > -1) {
@@ -935,22 +937,25 @@ static int retrieve_file(char *dir, int msgnum)
 						fd = -1;
 						continue;
 					}
-					if (fd > -1) {
-						if ((fdm = mmap(NULL, fdlen, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == -1) {
+					/* Read out in small chunks */
+					for (offset = 0; offset < colsize; offset += CHUNKSIZE) {
+						/* +1 because SQLGetData likes null-terminating binary data */
+						if ((fdm = mmap(NULL, CHUNKSIZE + 1, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset)) == -1) {
 							ast_log(LOG_WARNING, "Could not mmap the output file: %s (%d)\n", strerror(errno), errno);
 							SQLFreeHandle(SQL_HANDLE_STMT, stmt);
 							goto yuck;
+						} else {
+							res = SQLGetData(stmt, x + 1, SQL_BINARY, fdm, CHUNKSIZE + 1, NULL);
+							munmap(fdm, 0);
+							if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
+								ast_log(LOG_WARNING, "SQL Get Data error!\n[%s]\n\n", sql);
+								unlink(full_fn);
+								SQLFreeHandle(SQL_HANDLE_STMT, stmt);
+								goto yuck;
+							}
 						}
 					}
-				}
-				if (fdm) {
-					memset(fdm, 0, fdlen);
-					res = SQLGetData(stmt, x + 1, SQL_BINARY, fdm, fdlen, &colsize);
-					if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
-						ast_log(LOG_WARNING, "SQL Get Data error!\n[%s]\n\n", sql);
-						SQLFreeHandle (SQL_HANDLE_STMT, stmt);
-						goto yuck;
-					}
+					truncate(full_fn, fdlen);
 				}
 			} else {
 				res = SQLGetData(stmt, x + 1, SQL_CHAR, rowdata, sizeof(rowdata), NULL);
@@ -969,8 +974,6 @@ static int retrieve_file(char *dir, int msgnum)
 yuck:	
 	if (f)
 		fclose(f);
-	if (fdm)
-		munmap(fdm, fdlen);
 	if (fd > -1)
 		close(fd);
 	return x - 1;