diff --git a/internal/cgen/auxiliary/base.cc b/internal/cgen/auxiliary/base.cc
index 73e643a..203d170 100644
--- a/internal/cgen/auxiliary/base.cc
+++ b/internal/cgen/auxiliary/base.cc
@@ -53,6 +53,12 @@
 
 // --------
 
+MemoryInput::MemoryInput(const char* ptr, size_t len)
+    : m_io(wuffs_base__ptr_u8__reader(
+          static_cast<uint8_t*>(static_cast<void*>(const_cast<char*>(ptr))),
+          len,
+          true)) {}
+
 MemoryInput::MemoryInput(const uint8_t* ptr, size_t len)
     : m_io(wuffs_base__ptr_u8__reader(const_cast<uint8_t*>(ptr), len, true)) {}
 
diff --git a/internal/cgen/auxiliary/base.hh b/internal/cgen/auxiliary/base.hh
index e1aee48..d60d737 100644
--- a/internal/cgen/auxiliary/base.hh
+++ b/internal/cgen/auxiliary/base.hh
@@ -63,6 +63,7 @@
 // It does not take responsibility for freeing the memory when done.
 class MemoryInput : public Input {
  public:
+  MemoryInput(const char* ptr, size_t len);
   MemoryInput(const uint8_t* ptr, size_t len);
 
   virtual IOBuffer* BringsItsOwnIOBuffer();
diff --git a/internal/cgen/data/data.go b/internal/cgen/data/data.go
index e2213e1..4bc5dc6 100644
--- a/internal/cgen/data/data.go
+++ b/internal/cgen/data/data.go
@@ -609,7 +609,7 @@
 	"" +
 	"// --------\n\nFileInput::FileInput(FILE* f) : m_f(f) {}\n\nstd::string  //\nFileInput::CopyIn(IOBuffer* dst) {\n  if (!m_f) {\n    return \"wuffs_aux::sync_io::FileInput: nullptr file\";\n  } else if (dst && !dst->meta.closed) {\n    size_t n = fread(dst->writer_pointer(), 1, dst->writer_length(), m_f);\n    dst->meta.wi += n;\n    dst->meta.closed = feof(m_f);\n    if (ferror(m_f)) {\n      return \"wuffs_aux::sync_io::FileInput: error reading file\";\n    }\n  }\n  return \"\";\n}\n\n" +
 	"" +
-	"// --------\n\nMemoryInput::MemoryInput(const uint8_t* ptr, size_t len)\n    : m_io(wuffs_base__ptr_u8__reader(const_cast<uint8_t*>(ptr), len, true)) {}\n\nIOBuffer*  //\nMemoryInput::BringsItsOwnIOBuffer() {\n  return &m_io;\n}\n\nstd::string  //\nMemoryInput::CopyIn(IOBuffer* dst) {\n  if (dst && !dst->meta.closed && (dst != &m_io)) {\n    size_t nd = dst->writer_length();\n    size_t ns = m_io.reader_length();\n    size_t n = (nd < ns) ? nd : ns;\n    memcpy(dst->writer_pointer(), m_io.reader_pointer(), n);\n    m_io.meta.ri += n;\n    dst->meta.wi += n;\n    dst->meta.closed = m_io.reader_length() == 0;\n  }\n  return \"\";\n}\n\n" +
+	"// --------\n\nMemoryInput::MemoryInput(const char* ptr, size_t len)\n    : m_io(wuffs_base__ptr_u8__reader(\n          static_cast<uint8_t*>(static_cast<void*>(const_cast<char*>(ptr))),\n          len,\n          true)) {}\n\nMemoryInput::MemoryInput(const uint8_t* ptr, size_t len)\n    : m_io(wuffs_base__ptr_u8__reader(const_cast<uint8_t*>(ptr), len, true)) {}\n\nIOBuffer*  //\nMemoryInput::BringsItsOwnIOBuffer() {\n  return &m_io;\n}\n\nstd::string  //\nMemoryInput::CopyIn(IOBuffer* dst) {\n  if (dst && !dst->meta.closed && (dst != &m_io)) {\n    size_t nd = dst->writer_length();\n    size_t ns = m_io.reader_length();\n    size_t n = (nd < ns) ? nd : ns;\n    memcpy(dst->writer_pointer(), m_io.reader_pointer(), n);\n    m_io.meta.ri += n;\n    dst->meta.wi += n;\n    dst->meta.closed = m_io.reader_length() == 0;\n  }\n  return \"\";\n}\n\n" +
 	"" +
 	"// --------\n\n}  // namespace sync_io\n\n}  // namespace wuffs_aux\n\n#endif  // !defined(WUFFS_CONFIG__MODULES) ||\n        // defined(WUFFS_CONFIG__MODULE__AUX__BASE)\n" +
 	""
@@ -621,7 +621,7 @@
 	"" +
 	"// --------\n\n// FileInput is an Input that reads from a file source.\n//\n// It does not take responsibility for closing the file when done.\nclass FileInput : public Input {\n public:\n  FileInput(FILE* f);\n\n  virtual std::string CopyIn(IOBuffer* dst);\n\n private:\n  FILE* m_f;\n\n  // Delete the copy and assign constructors.\n  FileInput(const FileInput&) = delete;\n  FileInput& operator=(const FileInput&) = delete;\n};\n\n" +
 	"" +
-	"// --------\n\n// MemoryInput is an Input that reads from an in-memory source.\n//\n// It does not take responsibility for freeing the memory when done.\nclass MemoryInput : public Input {\n public:\n  MemoryInput(const uint8_t* ptr, size_t len);\n\n  virtual IOBuffer* BringsItsOwnIOBuffer();\n  virtual std::string CopyIn(IOBuffer* dst);\n\n private:\n  IOBuffer m_io;\n\n  // Delete the copy and assign constructors.\n  MemoryInput(const MemoryInput&) = delete;\n  MemoryInput& operator=(const MemoryInput&) = delete;\n};\n\n" +
+	"// --------\n\n// MemoryInput is an Input that reads from an in-memory source.\n//\n// It does not take responsibility for freeing the memory when done.\nclass MemoryInput : public Input {\n public:\n  MemoryInput(const char* ptr, size_t len);\n  MemoryInput(const uint8_t* ptr, size_t len);\n\n  virtual IOBuffer* BringsItsOwnIOBuffer();\n  virtual std::string CopyIn(IOBuffer* dst);\n\n private:\n  IOBuffer m_io;\n\n  // Delete the copy and assign constructors.\n  MemoryInput(const MemoryInput&) = delete;\n  MemoryInput& operator=(const MemoryInput&) = delete;\n};\n\n" +
 	"" +
 	"// --------\n\n}  // namespace sync_io\n\n}  // namespace wuffs_aux\n" +
 	""
diff --git a/release/c/wuffs-unsupported-snapshot.c b/release/c/wuffs-unsupported-snapshot.c
index 301b0cd..04f6932 100644
--- a/release/c/wuffs-unsupported-snapshot.c
+++ b/release/c/wuffs-unsupported-snapshot.c
@@ -8455,6 +8455,7 @@
 // It does not take responsibility for freeing the memory when done.
 class MemoryInput : public Input {
  public:
+  MemoryInput(const char* ptr, size_t len);
   MemoryInput(const uint8_t* ptr, size_t len);
 
   virtual IOBuffer* BringsItsOwnIOBuffer();
@@ -28999,6 +29000,12 @@
 
 // --------
 
+MemoryInput::MemoryInput(const char* ptr, size_t len)
+    : m_io(wuffs_base__ptr_u8__reader(
+          static_cast<uint8_t*>(static_cast<void*>(const_cast<char*>(ptr))),
+          len,
+          true)) {}
+
 MemoryInput::MemoryInput(const uint8_t* ptr, size_t len)
     : m_io(wuffs_base__ptr_u8__reader(const_cast<uint8_t*>(ptr), len, true)) {}