Add Buffer constructors taking std::string parameters

include/qpdf/Buffer.hh

@@ -24,6 +24,7 @@
 
 #include <cstddef>
 #include <memory>
+#include <string>
 
 class Buffer
 {
@@ -35,11 +36,15 @@ class Buffer
     // object is destroyed.
     QPDF_DLL
     Buffer(size_t size);
+    QPDF_DLL
+    Buffer(std::string&& content);
 
     // Create a Buffer object whose memory is owned by the caller and will not be freed when the
     // Buffer is destroyed.
     QPDF_DLL
     Buffer(unsigned char* buf, size_t size);
+    QPDF_DLL
+    Buffer(std::string& content);
 
     [[deprecated("Move Buffer or use Buffer::copy instead")]] QPDF_DLL Buffer(Buffer const&);
     [[deprecated("Move Buffer or use Buffer::copy instead")]] QPDF_DLL Buffer&
@@ -75,8 +80,10 @@ class Buffer
 
       private:
         Members(size_t size, unsigned char* buf, bool own_memory);
+        Members(std::string&& content);
         Members(Members const&) = delete;
 
+        std::string str;
         bool own_memory;
         size_t size;
         unsigned char* buf;

libqpdf/Buffer.cc

@@ -27,6 +27,14 @@ Buffer::Members::Members(size_t size, unsigned char* buf, bool own_memory) :
     }
 }
 
+Buffer::Members::Members(std::string&& content) :
+    str(std::move(content)),
+    own_memory(false),
+    size(str.size()),
+    buf(reinterpret_cast<unsigned char*>(str.data()))
+{
+}
+
 Buffer::Members::~Members()
 {
     if (this->own_memory) {
@@ -44,11 +52,21 @@ Buffer::Buffer(size_t size) :
 {
 }
 
+Buffer::Buffer(std::string&& content) :
+    m(new Members(std::move(content)))
+{
+}
+
 Buffer::Buffer(unsigned char* buf, size_t size) :
     m(new Members(size, buf, false))
 {
 }
 
+Buffer::Buffer(std::string& content) :
+    m(new Members(content.size(), reinterpret_cast<unsigned char*>(content.data()), false))
+{
+}
+
 Buffer::Buffer(Buffer const& rhs)
 {
     assert(test_mode);

libqpdf/Pl_Buffer.cc

@@ -42,13 +42,7 @@ Pl_Buffer::getBuffer()
     if (!m->ready) {
         throw std::logic_error("Pl_Buffer::getBuffer() called when not ready");
     }
-
-    auto size = m->data.size();
-    auto* b = new Buffer(size);
-    if (size > 0) {
-        unsigned char* p = b->getBuffer();
-        memcpy(p, m->data.data(), size);
-    }
+    auto* b = new Buffer(std::move(m->data));
     m->data.clear();
     return b;
 }

libtests/buffer.cc

@@ -35,6 +35,21 @@ main()
         assert(bc2p != bc1p);
         assert(bc2p[0] == 'R');
         assert(bc2p[1] == 'W');
+
+        // Test Buffer(std:string&&)
+        Buffer bc3("QW");
+        unsigned char* bc3p = bc3.getBuffer();
+        Buffer bc4(bc3.copy());
+        bc3p[0] = 'R';
+        unsigned char* bc4p = bc4.getBuffer();
+        assert(bc4p != bc3p);
+        assert(bc4p[0] == 'Q');
+        assert(bc4p[1] == 'W');
+        bc4 = bc3.copy();
+        bc4p = bc4.getBuffer();
+        assert(bc4p != bc3p);
+        assert(bc4p[0] == 'R');
+        assert(bc4p[1] == 'W');
     }
 
 #ifdef _MSC_VER
@@ -62,6 +77,37 @@ main()
         assert(bc2p != bc1p);
         assert(bc2p[0] == 'R');
         assert(bc2p[1] == 'W');
+
+        // Test Buffer(std:string&&)
+        Buffer bc3("QW");
+        unsigned char* bc3p = bc3.getBuffer();
+        Buffer bc4(bc3);
+        bc3p[0] = 'R';
+        unsigned char* bc4p = bc4.getBuffer();
+        assert(bc4p != bc3p);
+        assert(bc4p[0] == 'Q');
+        assert(bc4p[1] == 'W');
+        bc4 = bc3;
+        bc4p = bc4.getBuffer();
+        assert(bc4p != bc3p);
+        assert(bc2p[0] == 'R');
+        assert(bc2p[1] == 'W');
+
+        // Test Buffer(std:string&)
+        std::string s{"QW"};
+        Buffer bc5(s);
+        unsigned char* bc5p = bc5.getBuffer();
+        Buffer bc6(bc5);
+        bc5p[0] = 'R';
+        unsigned char* bc6p = bc6.getBuffer();
+        assert(bc6p != bc5p);
+        assert(bc6p[0] == 'Q');
+        assert(bc6p[1] == 'W');
+        bc6 = bc5;
+        bc6p = bc6.getBuffer();
+        assert(bc6p != bc5p);
+        assert(bc2p[0] == 'R');
+        assert(bc2p[1] == 'W');
     }
 #if (defined(__GNUC__) || defined(__clang__))
 # pragma GCC diagnostic pop
@@ -82,6 +128,19 @@ main()
         Buffer bm3 = std::move(bm2);
         unsigned char* bm3p = bm3.getBuffer();
         assert(bm3p == bm2p);
+
+        // Test Buffer(dtd::string&&)
+        Buffer bm4("QW");
+        unsigned char* bm4p = bm4.getBuffer();
+        Buffer bm5(std::move(bm4));
+        bm4p[0] = 'R';
+        unsigned char* bm5p = bm5.getBuffer();
+        assert(bm5p == bm4p);
+        assert(bm5p[0] == 'R');
+
+        Buffer bm6 = std::move(bm5);
+        unsigned char* bm6p = bm6.getBuffer();
+        assert(bm6p == bm5p);
     }
 
     try {