116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkReader32_DEFINED
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#define SkReader32_DEFINED
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#include "SkTypes.h"
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#include "SkScalar.h"
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#include "SkPoint.h"
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#include "SkRect.h"
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class SkReader32 : SkNoncopyable {
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public:
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SkReader32() : fCurr(NULL), fStop(NULL), fBase(NULL) {}
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SkReader32(const void* data, size_t size) {
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this->setMemory(data, size);
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}
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void setMemory(const void* data, size_t size) {
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SkASSERT(ptr_align_4(data));
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SkASSERT(SkAlign4(size) == size);
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fBase = fCurr = (const char*)data;
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fStop = (const char*)data + size;
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}
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uint32_t size() const { return fStop - fBase; }
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uint32_t offset() const { return fCurr - fBase; }
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bool eof() const { return fCurr >= fStop; }
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const void* base() const { return fBase; }
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const void* peek() const { return fCurr; }
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void rewind() { fCurr = fBase; }
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void setOffset(size_t offset) {
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SkASSERT(SkAlign4(offset) == offset);
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SkASSERT(offset <= this->size());
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fCurr = fBase + offset;
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}
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bool readBool() { return this->readInt() != 0; }
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int32_t readInt() {
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SkASSERT(ptr_align_4(fCurr));
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int32_t value = *(const int32_t*)fCurr;
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fCurr += sizeof(value);
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SkASSERT(fCurr <= fStop);
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return value;
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}
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SkScalar readScalar() {
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SkASSERT(ptr_align_4(fCurr));
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SkScalar value = *(const SkScalar*)fCurr;
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fCurr += sizeof(value);
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SkASSERT(fCurr <= fStop);
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return value;
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}
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const SkPoint* skipPoint() {
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return (const SkPoint*)this->skip(sizeof(SkPoint));
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}
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const SkRect* skipRect() {
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return (const SkRect*)this->skip(sizeof(SkRect));
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}
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const void* skip(size_t size) {
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SkASSERT(ptr_align_4(fCurr));
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const void* addr = fCurr;
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fCurr += SkAlign4(size);
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SkASSERT(fCurr <= fStop);
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return addr;
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}
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void read(void* dst, size_t size) {
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SkASSERT(dst != NULL);
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SkASSERT(ptr_align_4(fCurr));
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memcpy(dst, fCurr, size);
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fCurr += SkAlign4(size);
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SkASSERT(fCurr <= fStop);
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}
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uint8_t readU8() { return (uint8_t)this->readInt(); }
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uint16_t readU16() { return (uint16_t)this->readInt(); }
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int32_t readS32() { return this->readInt(); }
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uint32_t readU32() { return this->readInt(); }
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private:
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// these are always 4-byte aligned
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const char* fCurr; // current position within buffer
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const char* fStop; // end of buffer
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const char* fBase; // beginning of buffer
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#ifdef SK_DEBUG
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static bool ptr_align_4(const void* ptr)
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{
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return (((const char*)ptr - (const char*)NULL) & 3) == 0;
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}
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#endif
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};
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#endif
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