1 files changed, 90 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/base/SkBuffer.cpp b/gfx/skia/skia/src/base/SkBuffer.cpp
new file mode 100644
index 0000000000..bb39782215
--- /dev/null
+++ b/gfx/skia/skia/src/base/SkBuffer.cpp
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2006 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "src/base/SkBuffer.h"
+
+#include "include/private/base/SkAlign.h"
+#include "include/private/base/SkMalloc.h"
+
+#include <cstdint>
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+const void* SkRBuffer::skip(size_t size) {
+    if (fValid && size <= this->available()) {
+        const void* pos = fPos;
+        fPos += size;
+        return pos;
+    }
+    fValid = false;
+    return nullptr;
+}
+
+bool SkRBuffer::read(void* buffer, size_t size) {
+    if (const void* src = this->skip(size)) {
+        sk_careful_memcpy(buffer, src, size);
+        return true;
+    }
+    return false;
+}
+
+bool SkRBuffer::skipToAlign4() {
+    intptr_t pos = reinterpret_cast<intptr_t>(fPos);
+    size_t n = SkAlign4(pos) - pos;
+    if (fValid && n <= this->available()) {
+        fPos += n;
+        return true;
+    } else {
+        fValid = false;
+        return false;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+void* SkWBuffer::skip(size_t size) {
+    void* result = fPos;
+    writeNoSizeCheck(nullptr, size);
+    return fData == nullptr ? nullptr : result;
+}
+
+void SkWBuffer::writeNoSizeCheck(const void* buffer, size_t size) {
+    SkASSERT(fData == nullptr || fStop == nullptr || fPos + size <= fStop);
+    if (fData && buffer) {
+        sk_careful_memcpy(fPos, buffer, size);
+    }
+    fPos += size;
+}
+
+size_t SkWBuffer::padToAlign4() {
+    size_t pos = this->pos();
+    size_t n = SkAlign4(pos) - pos;
+
+    if (n && fData)
+    {
+        char* p = fPos;
+        char* stop = p + n;
+        do {
+            *p++ = 0;
+        } while (p < stop);
+    }
+    fPos += n;
+    return n;
+}
+
+#if 0
+#ifdef SK_DEBUG
+    static void AssertBuffer32(const void* buffer)
+    {
+        SkASSERT(buffer);
+        SkASSERT(((size_t)buffer & 3) == 0);
+    }
+#else
+    #define AssertBuffer32(buffer)
+#endif
+
+#endif