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comparison: gfx/skia/trunk/src/core/SkBuffer.cpp
gfx/skia/trunk/src/core/SkBuffer.cpp
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:f507fa9284a6 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2006 The Android Open Source Project | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 | |
| 9 | |
| 10 #include "SkBuffer.h" | |
| 11 | |
| 12 //////////////////////////////////////////////////////////////////////////////////////// | |
| 13 | |
| 14 void SkRBuffer::readNoSizeCheck(void* buffer, size_t size) | |
| 15 { | |
| 16 SkASSERT((fData != 0 && fStop == 0) || fPos + size <= fStop); | |
| 17 if (buffer) | |
| 18 memcpy(buffer, fPos, size); | |
| 19 fPos += size; | |
| 20 } | |
| 21 | |
| 22 const void* SkRBuffer::skip(size_t size) | |
| 23 { | |
| 24 const void* result = fPos; | |
| 25 readNoSizeCheck(NULL, size); | |
| 26 return result; | |
| 27 } | |
| 28 | |
| 29 size_t SkRBuffer::skipToAlign4() | |
| 30 { | |
| 31 size_t pos = this->pos(); | |
| 32 size_t n = SkAlign4(pos) - pos; | |
| 33 fPos += n; | |
| 34 return n; | |
| 35 } | |
| 36 | |
| 37 bool SkRBufferWithSizeCheck::read(void* buffer, size_t size) { | |
| 38 fError = fError || (fPos + size > fStop); | |
| 39 if (!fError && (size > 0)) { | |
| 40 readNoSizeCheck(buffer, size); | |
| 41 } | |
| 42 return !fError; | |
| 43 } | |
| 44 | |
| 45 void* SkWBuffer::skip(size_t size) | |
| 46 { | |
| 47 void* result = fPos; | |
| 48 writeNoSizeCheck(NULL, size); | |
| 49 return fData == NULL ? NULL : result; | |
| 50 } | |
| 51 | |
| 52 void SkWBuffer::writeNoSizeCheck(const void* buffer, size_t size) | |
| 53 { | |
| 54 SkASSERT(fData == 0 || fStop == 0 || fPos + size <= fStop); | |
| 55 if (fData && buffer) | |
| 56 memcpy(fPos, buffer, size); | |
| 57 fPos += size; | |
| 58 } | |
| 59 | |
| 60 size_t SkWBuffer::padToAlign4() | |
| 61 { | |
| 62 size_t pos = this->pos(); | |
| 63 size_t n = SkAlign4(pos) - pos; | |
| 64 | |
| 65 if (n && fData) | |
| 66 { | |
| 67 char* p = fPos; | |
| 68 char* stop = p + n; | |
| 69 do { | |
| 70 *p++ = 0; | |
| 71 } while (p < stop); | |
| 72 } | |
| 73 fPos += n; | |
| 74 return n; | |
| 75 } | |
| 76 | |
| 77 #if 0 | |
| 78 #ifdef SK_DEBUG | |
| 79 static void AssertBuffer32(const void* buffer) | |
| 80 { | |
| 81 SkASSERT(buffer); | |
| 82 SkASSERT(((size_t)buffer & 3) == 0); | |
| 83 } | |
| 84 #else | |
| 85 #define AssertBuffer32(buffer) | |
| 86 #endif | |
| 87 | |
| 88 void* sk_buffer_write_int32(void* buffer, int32_t value) | |
| 89 { | |
| 90 AssertBuffer32(buffer); | |
| 91 *(int32_t*)buffer = value; | |
| 92 return (char*)buffer + sizeof(int32_t); | |
| 93 } | |
| 94 | |
| 95 void* sk_buffer_write_int32(void* buffer, const int32_t values[], int count) | |
| 96 { | |
| 97 AssertBuffer32(buffer); | |
| 98 SkASSERT(count >= 0); | |
| 99 | |
| 100 memcpy((int32_t*)buffer, values, count * sizeof(int32_t)); | |
| 101 return (char*)buffer + count * sizeof(int32_t); | |
| 102 } | |
| 103 | |
| 104 const void* sk_buffer_read_int32(const void* buffer, int32_t* value) | |
| 105 { | |
| 106 AssertBuffer32(buffer); | |
| 107 if (value) | |
| 108 *value = *(const int32_t*)buffer; | |
| 109 return (const char*)buffer + sizeof(int32_t); | |
| 110 } | |
| 111 | |
| 112 const void* sk_buffer_read_int32(const void* buffer, int32_t values[], int count) | |
| 113 { | |
| 114 AssertBuffer32(buffer); | |
| 115 SkASSERT(count >= 0); | |
| 116 | |
| 117 if (values) | |
| 118 memcpy(values, (const int32_t*)buffer, count * sizeof(int32_t)); | |
| 119 return (const char*)buffer + count * sizeof(int32_t); | |
| 120 } | |
| 121 | |
| 122 void* sk_buffer_write_ptr(void* buffer, void* ptr) | |
| 123 { | |
| 124 AssertBuffer32(buffer); | |
| 125 *(void**)buffer = ptr; | |
| 126 return (char*)buffer + sizeof(void*); | |
| 127 } | |
| 128 | |
| 129 const void* sk_buffer_read_ptr(const void* buffer, void** ptr) | |
| 130 { | |
| 131 AssertBuffer32(buffer); | |
| 132 if (ptr) | |
| 133 *ptr = *(void**)buffer; | |
| 134 return (const char*)buffer + sizeof(void*); | |
| 135 } | |
| 136 | |
| 137 #endif |
