added tests/pipetest.c so I can test pcpstream with armoring with various blocksizes

tests/pipetest.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include <pcp.h>
+
+int main(int argc, char **argv) {
+  if(argc < 4) {
+    fprintf(stderr, "Usage: pipetest <read-blocksize> <z85-blocksize> <d|e>\n");
+    fprintf(stderr, "d - decode\ne - encode\n");
+    return 1;
+  }
+
+  size_t rblocksize;
+  size_t zblocksize;
+  char mode;
+
+  if((rblocksize = strtol(argv[1], NULL, 0)) == 0) {
+    fprintf(stderr, "Error: invalid read blocksize %s\n", argv[1]);
+    return 1;
+  }
+
+  if((zblocksize = strtol(argv[2], NULL, 0)) == 0) {
+    fprintf(stderr, "Error: invalid z85 blocksize %s\n", argv[2]);
+    return 1;
+  }
+
+  if(zblocksize % 4 != 0) {
+    fprintf(stderr, "Error: z85 blocksize shall be divisible by 4\n");
+    return 1;
+  }
+
+  mode = argv[3][0];
+
+  if(mode != 'd' && mode != 'e') {
+    fprintf(stderr, "Error: invalid mode %s\n", argv[3]);
+    return 1;
+  }
+
+  Pcpstream *in = ps_new_file(stdin);
+  Pcpstream *out = ps_new_file(stdout);
+  size_t got;
+
+  if(mode == 'e')
+    ps_armor(out, zblocksize);
+  else 
+    ps_setdetermine(in, zblocksize);
+
+  void *buf = ucmalloc(rblocksize);
+
+  while(!ps_end(in)) {
+    got = ps_read(in, buf, rblocksize);
+    if(got > 0)
+      ps_write(out, buf, got);
+  }
+
+  ps_finish(out);
+  ps_close(in);
+  ps_close(out);
+
+  return 0;
+}