| /* |
| * 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 "include/private/SkMalloc.h" |
| #include "src/core/SkBuffer.h" |
| #include <string.h> |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| 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 |