1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkBuffer.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,137 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#include "SkBuffer.h"
1.14 +
1.15 +////////////////////////////////////////////////////////////////////////////////////////
1.16 +
1.17 +void SkRBuffer::readNoSizeCheck(void* buffer, size_t size)
1.18 +{
1.19 + SkASSERT((fData != 0 && fStop == 0) || fPos + size <= fStop);
1.20 + if (buffer)
1.21 + memcpy(buffer, fPos, size);
1.22 + fPos += size;
1.23 +}
1.24 +
1.25 +const void* SkRBuffer::skip(size_t size)
1.26 +{
1.27 + const void* result = fPos;
1.28 + readNoSizeCheck(NULL, size);
1.29 + return result;
1.30 +}
1.31 +
1.32 +size_t SkRBuffer::skipToAlign4()
1.33 +{
1.34 + size_t pos = this->pos();
1.35 + size_t n = SkAlign4(pos) - pos;
1.36 + fPos += n;
1.37 + return n;
1.38 +}
1.39 +
1.40 +bool SkRBufferWithSizeCheck::read(void* buffer, size_t size) {
1.41 + fError = fError || (fPos + size > fStop);
1.42 + if (!fError && (size > 0)) {
1.43 + readNoSizeCheck(buffer, size);
1.44 + }
1.45 + return !fError;
1.46 +}
1.47 +
1.48 +void* SkWBuffer::skip(size_t size)
1.49 +{
1.50 + void* result = fPos;
1.51 + writeNoSizeCheck(NULL, size);
1.52 + return fData == NULL ? NULL : result;
1.53 +}
1.54 +
1.55 +void SkWBuffer::writeNoSizeCheck(const void* buffer, size_t size)
1.56 +{
1.57 + SkASSERT(fData == 0 || fStop == 0 || fPos + size <= fStop);
1.58 + if (fData && buffer)
1.59 + memcpy(fPos, buffer, size);
1.60 + fPos += size;
1.61 +}
1.62 +
1.63 +size_t SkWBuffer::padToAlign4()
1.64 +{
1.65 + size_t pos = this->pos();
1.66 + size_t n = SkAlign4(pos) - pos;
1.67 +
1.68 + if (n && fData)
1.69 + {
1.70 + char* p = fPos;
1.71 + char* stop = p + n;
1.72 + do {
1.73 + *p++ = 0;
1.74 + } while (p < stop);
1.75 + }
1.76 + fPos += n;
1.77 + return n;
1.78 +}
1.79 +
1.80 +#if 0
1.81 +#ifdef SK_DEBUG
1.82 + static void AssertBuffer32(const void* buffer)
1.83 + {
1.84 + SkASSERT(buffer);
1.85 + SkASSERT(((size_t)buffer & 3) == 0);
1.86 + }
1.87 +#else
1.88 + #define AssertBuffer32(buffer)
1.89 +#endif
1.90 +
1.91 +void* sk_buffer_write_int32(void* buffer, int32_t value)
1.92 +{
1.93 + AssertBuffer32(buffer);
1.94 + *(int32_t*)buffer = value;
1.95 + return (char*)buffer + sizeof(int32_t);
1.96 +}
1.97 +
1.98 +void* sk_buffer_write_int32(void* buffer, const int32_t values[], int count)
1.99 +{
1.100 + AssertBuffer32(buffer);
1.101 + SkASSERT(count >= 0);
1.102 +
1.103 + memcpy((int32_t*)buffer, values, count * sizeof(int32_t));
1.104 + return (char*)buffer + count * sizeof(int32_t);
1.105 +}
1.106 +
1.107 +const void* sk_buffer_read_int32(const void* buffer, int32_t* value)
1.108 +{
1.109 + AssertBuffer32(buffer);
1.110 + if (value)
1.111 + *value = *(const int32_t*)buffer;
1.112 + return (const char*)buffer + sizeof(int32_t);
1.113 +}
1.114 +
1.115 +const void* sk_buffer_read_int32(const void* buffer, int32_t values[], int count)
1.116 +{
1.117 + AssertBuffer32(buffer);
1.118 + SkASSERT(count >= 0);
1.119 +
1.120 + if (values)
1.121 + memcpy(values, (const int32_t*)buffer, count * sizeof(int32_t));
1.122 + return (const char*)buffer + count * sizeof(int32_t);
1.123 +}
1.124 +
1.125 +void* sk_buffer_write_ptr(void* buffer, void* ptr)
1.126 +{
1.127 + AssertBuffer32(buffer);
1.128 + *(void**)buffer = ptr;
1.129 + return (char*)buffer + sizeof(void*);
1.130 +}
1.131 +
1.132 +const void* sk_buffer_read_ptr(const void* buffer, void** ptr)
1.133 +{
1.134 + AssertBuffer32(buffer);
1.135 + if (ptr)
1.136 + *ptr = *(void**)buffer;
1.137 + return (const char*)buffer + sizeof(void*);
1.138 +}
1.139 +
1.140 +#endif
