The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/core/SkWriter32.cpp
gfx/skia/trunk/src/core/SkWriter32.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:2422ee458b73 |
|---|---|
| 1 /* | |
| 2 * Copyright 2011 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "SkReader32.h" | |
| 9 #include "SkString.h" | |
| 10 #include "SkWriter32.h" | |
| 11 | |
| 12 /* | |
| 13 * Strings are stored as: length[4-bytes] + string_data + '\0' + pad_to_mul_4 | |
| 14 */ | |
| 15 | |
| 16 const char* SkReader32::readString(size_t* outLen) { | |
| 17 size_t len = this->readInt(); | |
| 18 const void* ptr = this->peek(); | |
| 19 | |
| 20 // skip over the string + '\0' and then pad to a multiple of 4 | |
| 21 size_t alignedSize = SkAlign4(len + 1); | |
| 22 this->skip(alignedSize); | |
| 23 | |
| 24 if (outLen) { | |
| 25 *outLen = len; | |
| 26 } | |
| 27 return (const char*)ptr; | |
| 28 } | |
| 29 | |
| 30 size_t SkReader32::readIntoString(SkString* copy) { | |
| 31 size_t len; | |
| 32 const char* ptr = this->readString(&len); | |
| 33 if (copy) { | |
| 34 copy->set(ptr, len); | |
| 35 } | |
| 36 return len; | |
| 37 } | |
| 38 | |
| 39 void SkWriter32::writeString(const char str[], size_t len) { | |
| 40 if (NULL == str) { | |
| 41 str = ""; | |
| 42 len = 0; | |
| 43 } | |
| 44 if ((long)len < 0) { | |
| 45 len = strlen(str); | |
| 46 } | |
| 47 | |
| 48 // [ 4 byte len ] [ str ... ] [1 - 4 \0s] | |
| 49 uint32_t* ptr = this->reservePad(sizeof(uint32_t) + len + 1); | |
| 50 *ptr = len; | |
| 51 char* chars = (char*)(ptr + 1); | |
| 52 memcpy(chars, str, len); | |
| 53 chars[len] = '\0'; | |
| 54 } | |
| 55 | |
| 56 size_t SkWriter32::WriteStringSize(const char* str, size_t len) { | |
| 57 if ((long)len < 0) { | |
| 58 SkASSERT(str); | |
| 59 len = strlen(str); | |
| 60 } | |
| 61 const size_t lenBytes = 4; // we use 4 bytes to record the length | |
| 62 // add 1 since we also write a terminating 0 | |
| 63 return SkAlign4(lenBytes + len + 1); | |
| 64 } | |
| 65 | |
| 66 void SkWriter32::growToAtLeast(size_t size) { | |
| 67 const bool wasExternal = (fExternal != NULL) && (fData == fExternal); | |
| 68 | |
| 69 fCapacity = 4096 + SkTMax(size, fCapacity + (fCapacity / 2)); | |
| 70 fInternal.realloc(fCapacity); | |
| 71 fData = fInternal.get(); | |
| 72 | |
| 73 if (wasExternal) { | |
| 74 // we were external, so copy in the data | |
| 75 memcpy(fData, fExternal, fUsed); | |
| 76 } | |
| 77 // Invalidate the snapshot, we know it is no longer useful. | |
| 78 fSnapshot.reset(NULL); | |
| 79 } | |
| 80 | |
| 81 SkData* SkWriter32::snapshotAsData() const { | |
| 82 // get a non const version of this, we are only conceptually const | |
| 83 SkWriter32& mutable_this = *const_cast<SkWriter32*>(this); | |
| 84 // we use size change detection to invalidate the cached data | |
| 85 if ((fSnapshot.get() != NULL) && (fSnapshot->size() != fUsed)) { | |
| 86 mutable_this.fSnapshot.reset(NULL); | |
| 87 } | |
| 88 if (fSnapshot.get() == NULL) { | |
| 89 uint8_t* buffer = NULL; | |
| 90 if ((fExternal != NULL) && (fData == fExternal)) { | |
| 91 // We need to copy to an allocated buffer before returning. | |
| 92 buffer = (uint8_t*)sk_malloc_throw(fUsed); | |
| 93 memcpy(buffer, fData, fUsed); | |
| 94 } else { | |
| 95 buffer = mutable_this.fInternal.detach(); | |
| 96 // prepare us to do copy on write, by pretending the data buffer | |
| 97 // is external and size limited | |
| 98 mutable_this.fData = buffer; | |
| 99 mutable_this.fCapacity = fUsed; | |
| 100 mutable_this.fExternal = buffer; | |
| 101 } | |
| 102 mutable_this.fSnapshot.reset(SkData::NewFromMalloc(buffer, fUsed)); | |
| 103 } | |
| 104 return SkRef(fSnapshot.get()); // Take an extra ref for the caller. | |
| 105 } |
