When "getNextBlock" was called after "getNextLine", the pointer could still on the newline.

The pointer to a newline could not advance enough, when the line ended with \r\n. The resulting buffer was correct, as the buffer range went from <start> until \r, but that the pointer increased by just 1 could lead to the problem that the next pointer points at \n, which is still part of the newline and therefore, "getNextBlock" got 1 byte too much.

Refs Issue #4871

code/AssetLib/Ply/PlyParser.cpp

@@ -420,7 +420,7 @@ bool PLY::DOM::ParseHeader(IOStreamBuffer<char> &streamBuffer, std::vector<char>
         if (PLY::Element::ParseElement(streamBuffer, buffer, &out)) {
             // add the element to the list of elements
             alElements.push_back(out);
-        } else if (TokenMatch(buffer, "end_header", 10)) { //checks for /n ending, if it doesn't end with /r/n
+        } else if (TokenMatch(buffer, "end_header", 10)) {
             // we have reached the end of the header
             break;
         } else {

include/assimp/IOStreamBuffer.h

@@ -323,7 +323,9 @@ AI_FORCE_INLINE bool IOStreamBuffer<T>::getNextLine(std::vector<T> &buffer) {
         }
     }
     buffer[i] = '\n';
+    while (m_cachePos < m_cacheSize && (m_cache[m_cachePos] == '\r' || m_cache[m_cachePos] == '\n')) {
     ++m_cachePos;
+    }
 
     return true;
 }

test/unit/utPLYImportExport.cpp

@@ -125,6 +125,22 @@ TEST_F(utPLYImportExport, importBinaryPLY) {
     EXPECT_EQ(12u, scene->mMeshes[0]->mNumFaces);
 }
 
+// Tests of a PLY file gets read with \r\n as newlines instead of just \n (i.e. solidwork exported ply files)
+TEST_F(utPLYImportExport, importBinaryPLYWithRNNewline) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/PLY/cube_binary_header_with_RN_newline.ply", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+    ASSERT_NE(nullptr, scene->mMeshes[0]);
+    // This test model is double sided, so 12 faces instead of 6
+    ASSERT_EQ(12u, scene->mMeshes[0]->mNumFaces);
+    // Also check if the indices were parsed correctly
+    ASSERT_EQ(3u, scene->mMeshes[0]->mFaces[0].mNumIndices);
+    EXPECT_EQ(0u, scene->mMeshes[0]->mFaces[0].mIndices[0]);
+    EXPECT_EQ(1u, scene->mMeshes[0]->mFaces[0].mIndices[1]);
+    EXPECT_EQ(2u, scene->mMeshes[0]->mFaces[0].mIndices[2]);
+}
+
 TEST_F(utPLYImportExport, vertexColorTest) {
     Assimp::Importer importer;
     const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/PLY/float-color.ply", aiProcess_ValidateDataStructure);