Add internal Pl_Base64

Bidirectional base64; will be used by JSON v2.

1 files changed, 81 insertions, 0 deletions

diff --git a/libtests/base64.cc b/libtests/base64.cc
new file mode 100644
index 00000000..66f2d828
--- /dev/null
+++ b/libtests/base64.cc
@@ -0,0 +1,81 @@
+#include <qpdf/Pl_Base64.hh>
+
+#include <qpdf/Pl_StdioFile.hh>
+#include <qpdf/QUtil.hh>
+#include <cassert>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#include <stdexcept>
+
+static bool
+write_some(FILE* f, size_t bytes, Pipeline* p)
+{
+    unsigned char buf[1000];
+    assert(bytes <= sizeof(buf));
+    size_t len = fread(buf, 1, bytes, f);
+    if (len > 0) {
+        p->write(buf, len);
+    }
+    if (len < bytes) {
+        if (ferror(f)) {
+            std::cerr << "error reading file" << std::endl;
+            exit(2);
+        }
+        p->finish();
+        return false;
+    }
+    return (len == bytes);
+}
+
+static void
+usage()
+{
+    std::cerr << "Usage: base64 encode|decode" << std::endl;
+    exit(2);
+}
+
+int
+main(int argc, char* argv[])
+{
+    if (argc != 2) {
+        usage();
+    }
+    QUtil::binary_stdout();
+    QUtil::binary_stdin();
+    Pl_Base64::action_e action = Pl_Base64::a_decode;
+    if (strcmp(argv[1], "encode") == 0) {
+        action = Pl_Base64::a_encode;
+    } else if (strcmp(argv[1], "decode") != 0) {
+        usage();
+    }
+
+    try {
+        Pl_StdioFile out("stdout", stdout);
+        Pl_Base64 decode("decode", &out, action);
+        // The comments are "n: n%4 n%3", where n is the number of
+        // bytes read at the end of the call, and are there to
+        // indicate that we are reading in chunks that exercise
+        // various boundary conditions around subsequent writes and
+        // the state of buf and pos. There are some writes that don't
+        // do flush at all, some that call flush multiple times, and
+        // some that start in the middle and do flush, and this is
+        // true for both encode and decode.
+        if (write_some(stdin, 1, &decode) && //  1: 1 1
+            write_some(stdin, 4, &decode) && //  5: 1 2
+            write_some(stdin, 2, &decode) && //  7: 3 1
+            write_some(stdin, 2, &decode) && //  9: 1 0
+            write_some(stdin, 7, &decode) && // 16: 0 1
+            write_some(stdin, 1, &decode) && // 17: 1 2
+            write_some(stdin, 9, &decode) && // 26: 2 2
+            write_some(stdin, 2, &decode)) { // 28: 0 1
+            while (write_some(stdin, 1000, &decode)) {
+            }
+        }
+    } catch (std::exception& e) {
+        std::cout << "exception: " << e.what() << std::endl;
+        exit(2);
+    }
+
+    return 0;
+}