1 files changed, 30 insertions, 13 deletions

diff --git a/mpjpeg.c b/mpjpeg.c
index dd4b96e..b64c5f0 100644
--- a/mpjpeg.c
+++ b/mpjpeg.c
@@ -4,12 +4,11 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <error.h>
 
 #include "mpjpeg.h"
 #include "util.h"
 
-#define STARTS_WITH(str, prefix) strncmp(str, prefix, sizeof(prefix)-1)
-
 static
 char *boundary_line(const char *old) {
 	size_t len = strlen(old);
@@ -23,6 +22,21 @@ char *boundary_line(const char *old) {
 	return new;
 }
 
+static
+ssize_t safe_atoi(char *str) {
+	while (*str == ' ')
+		str++;
+	size_t len = 0;
+	while ('0' <= str[len] && str[len] <= '9')
+		len++;
+	size_t i = len;
+	while (str[i] == ' ')
+		i++;
+	if (len < 1 || strcmp(&str[i], "\r\n") != 0)
+		return -1;
+	return atoi(str);
+}
+
 void mpjpeg_reader(struct mpjpeg_stream *s, int fd, const char *boundary) {
 	FILE *stream = fdopen(fd, "r");
 	boundary = boundary_line(boundary);
@@ -32,30 +46,33 @@ void mpjpeg_reader(struct mpjpeg_stream *s, int fd, const char *boundary) {
 	ssize_t line_len = 0;
 
 	while (1) {
-		printf("getting frame\n");
 		s->back->len = -1;
 		/* read the frame header (MIME headers) */
-		line_len = getline(&line_buf, &line_cap, stream);
-		if (strcmp(line_buf, boundary) != 0)
+		do {
+			line_len = getline(&line_buf, &line_cap, stream);
+		} while (line_len >= 0 && strcmp(line_buf, "\r\n") == 0);
+		if (strcmp(line_buf, boundary) != 0) {
+			error(0, 0, "line does not match boundary: \"%s\"", line_buf);
 			return;
-		ssize_t framelen = -1;
+		}
 		while (strcmp(line_buf, "\r\n") != 0 && line_len >= 0) {
 			line_len = getline(&line_buf, &line_cap, stream);
-			if (STARTS_WITH(line_buf, "Content-Type:") == 0) {
-				printf("line: <%s>\n", line_buf);
-				s->back->len = atoi(&line_buf[strlen("Content-Type:")]);
+			if (strncasecmp(line_buf, "Content-length:", strlen("Content-length:")) == 0) {
+				s->back->len = safe_atoi(&line_buf[strlen("Content-length:")]);
 			}
 		}
-		if (s->back->len < 0)
+		if (s->back->len < 0) {
+			error(0, 0, "did not get frame length");
 			return;
+		}
 
 		/* read the frame contents (JPEG) */
 		if (s->back->cap < (size_t)s->back->len)
 			s->back->data = xrealloc(s->back->data, s->back->cap = s->back->len);
-		if (fread(line_buf, framelen, 1, stream) != 1)
+		if (fread(s->back->data, s->back->len, 1, stream) != 1) {
+			error(0, ferror(stream), "fread(%zd)", s->back->len);
 			return;
-
-		printf("got frame on fd %d\n", fd);
+		}
 
 		/* swap the frames */
 		pthread_mutex_lock(&s->frontlock);