.

htpipe.c

@@ -0,0 +1,81 @@
+#include "minimal_multipart_parser.h"
+#include <llhttp.h>
+#include <libowfat/buffer.h>
+#include <libowfat/errmsg.h>
+#include <unistd.h>
+
+#undef die
+#undef diesys
+#define die(n,...) \
+  do {                                                     \
+    carp(__VA_ARGS__,(char*)0);                          \
+    dieservererr(n,__VA_ARGS__,(char*)0);                    \
+  } while(0)
+#define diesys(n,...) \
+  do {                                                     \
+    carpsys(__VA_ARGS__,(char*)0);                          \
+    dieservererr(n,__VA_ARGS__,(char*)0);                    \
+  } while(0)
+
+static buffer topipe;
+
+static void dieservererr(int n,char *args,...)
+{
+  char *header = "HTTP/1.0 500 Internal Server Error\r\n"
+    "Connection: close\r\n"
+    "\r\n";
+  msg(header,args);
+  exit(n);
+}
+
+static void dienodata(void)
+{
+  char *header = "HTTP/1.0 400 Bad Request\r\n"
+    "Connection: close\r\n"
+    "\r\n";
+  msg(header,"HTTP multipart/form-data field expected.");
+  exit(100);
+}
+
+static void run(void) {
+  MinimalMultipartParserContext ctx = {0};
+  unsigned int ev;
+  int r;
+  char c;
+
+  for (;;) {
+    r = buffer_getc(buffer_0,&c);
+    if (r==0) break;
+    if (r<0) diesys(111,"read stdin");
+
+    ev = minimal_multipart_parser_process(&ctx,c);
+    if (ev==MultipartParserEvent_DataBufferAvailable) {
+      if (buffer_put(&topipe,
+          minimal_multipart_parser_get_data_buffer(&ctx),
+          minimal_multipart_parser_get_data_size(&ctx))<0
+      ) diesys(111,"write to pipe");
+    } else if (ev==MultipartParserEvent_DataStreamCompleted)
+      break;
+  }
+
+  if (!minimal_multipart_parser_is_file_received(&ctx))
+    dienodata();
+  if (buffer_flush(&topipe)<0)
+    diesys(111,"flush pipe write");
+}
+
+int main(int argc,char **argv)
+{
+  char buf[4096];
+  int pipefds[2];
+  argc--; argv++;
+  (void)argc;
+
+  if (pipe(pipefds)<0) diesys(111,"pipe");
+  buffer_init_write(&topipe,pipefds[1],buf,sizeof buf);
+
+  run();
+  if (dup2(pipefds[0],0)<0) diesys(111,"dup2");
+  execvp(*argv,argv);
+  diesys(111,"exec ",*argv);
+}