diff options
| -rw-r--r-- | src/library_memfs.js | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/library_memfs.js b/src/library_memfs.js index 24d6cc22..72ecdcfe 100644 --- a/src/library_memfs.js +++ b/src/library_memfs.js @@ -291,10 +291,13 @@ mergeInto(LibraryManager.library, { #if USE_TYPED_ARRAYS == 2 if (buffer.subarray && (!node.contents || node.contents.subarray)) { // This write is from a typed array to a typed array? if (canOwn) { // Can we just reuse the buffer we are given? +#if ASSERTIONS + assert(position === 0, 'canOwn must imply no weird position inside the file'); +#endif node.contents = buffer.subarray(offset, offset + length); node.usedBytes = length; return length; - } else if (node.usedBytes === 0) { // If this first write to an empty file, do a fast set since we don't need to care about old data. + } else if (node.usedBytes === 0 && position === 0) { // If this is a simple first write to an empty file, do a fast set since we don't need to care about old data. node.contents = new Uint8Array(buffer.subarray(offset, offset + length)); node.usedBytes = length; return length; |