in the attempt to fix 627393, changed IFX_FileRead's readBlock to return the length it reads

core/fxcrt/extension.h

Index: core/fxcrt/extension.h
diff --git a/core/fxcrt/extension.h b/core/fxcrt/extension.h
index ca2fc3c5b70a25587e183318a3760236f50c6c79..0961b664d9f7839c357b5ad6ae786f8e6454a9fd 100644
--- a/core/fxcrt/extension.h
+++ b/core/fxcrt/extension.h
@@ -65,7 +65,7 @@ class CFX_CRTFileStream final : public IFX_SeekableStream {
   FX_FILESIZE GetSize() override;
   bool IsEOF() override;
   FX_FILESIZE GetPosition() override;
-  bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+  size_t ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
   size_t ReadBlock(void* buffer, size_t size) override;
   bool WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override;
   bool Flush() override;
@@ -91,7 +91,7 @@ class CFX_MemoryStream final : public IFX_MemoryStream {
   FX_FILESIZE GetSize() override;
   bool IsEOF() override;
   FX_FILESIZE GetPosition() override;
-  bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+  size_t ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
   size_t ReadBlock(void* buffer, size_t size) override;
   bool WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override;
   bool Flush() override;