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/* libs/corecg/SkBuffer.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "SkBuffer.h"
////////////////////////////////////////////////////////////////////////////////////////
void SkRBuffer::readNoSizeCheck(void* buffer, size_t size)
{
SkASSERT((fData != 0 && fStop == 0) || fPos + size <= fStop);
if (buffer)
memcpy(buffer, fPos, size);
fPos += size;
}
const void* SkRBuffer::skip(size_t size)
{
const void* result = fPos;
readNoSizeCheck(NULL, size);
return result;
}
size_t SkRBuffer::skipToAlign4()
{
size_t pos = this->pos();
size_t n = SkAlign4(pos) - pos;
fPos += n;
return n;
}
void* SkWBuffer::skip(size_t size)
{
void* result = fPos;
writeNoSizeCheck(NULL, size);
return fData == NULL ? NULL : 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
void* sk_buffer_write_int32(void* buffer, int32_t value)
{
AssertBuffer32(buffer);
*(int32_t*)buffer = value;
return (char*)buffer + sizeof(int32_t);
}
void* sk_buffer_write_int32(void* buffer, const int32_t values[], int count)
{
AssertBuffer32(buffer);
SkASSERT(count >= 0);
memcpy((int32_t*)buffer, values, count * sizeof(int32_t));
return (char*)buffer + count * sizeof(int32_t);
}
const void* sk_buffer_read_int32(const void* buffer, int32_t* value)
{
AssertBuffer32(buffer);
if (value)
*value = *(const int32_t*)buffer;
return (const char*)buffer + sizeof(int32_t);
}
const void* sk_buffer_read_int32(const void* buffer, int32_t values[], int count)
{
AssertBuffer32(buffer);
SkASSERT(count >= 0);
if (values)
memcpy(values, (const int32_t*)buffer, count * sizeof(int32_t));
return (const char*)buffer + count * sizeof(int32_t);
}
void* sk_buffer_write_ptr(void* buffer, void* ptr)
{
AssertBuffer32(buffer);
*(void**)buffer = ptr;
return (char*)buffer + sizeof(void*);
}
const void* sk_buffer_read_ptr(const void* buffer, void** ptr)
{
AssertBuffer32(buffer);
if (ptr)
*ptr = *(void**)buffer;
return (const char*)buffer + sizeof(void*);
}
#endif
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