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/*
* 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 "SkBuffer.h"
#include <string.h>
///////////////////////////////////////////////////////////////////////////////////////////////////
bool SkRBuffer::read(void* buffer, size_t size) {
if (fValid && size <= this->available()) {
if (buffer) {
memcpy(buffer, fPos, size);
}
fPos += size;
return true;
} else {
fValid = false;
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 == 0 || fStop == 0 || fPos + size <= fStop);
if (fData && buffer)
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
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