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- /*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkString.h"
- #include "include/private/SkTo.h"
- #include "src/core/SkMatrixPriv.h"
- #include "src/core/SkReader32.h"
- #include "src/core/SkWriter32.h"
- void SkWriter32::writeMatrix(const SkMatrix& matrix) {
- size_t size = SkMatrixPriv::WriteToMemory(matrix, nullptr);
- SkASSERT(SkAlign4(size) == size);
- SkMatrixPriv::WriteToMemory(matrix, this->reserve(size));
- }
- /*
- * Strings are stored as: length[4-bytes] + string_data + '\0' + pad_to_mul_4
- */
- const char* SkReader32::readString(size_t* outLen) {
- size_t len = this->readU32();
- const void* ptr = this->peek();
- // skip over the string + '\0' and then pad to a multiple of 4
- size_t alignedSize = SkAlign4(len + 1);
- this->skip(alignedSize);
- if (outLen) {
- *outLen = len;
- }
- return (const char*)ptr;
- }
- size_t SkReader32::readIntoString(SkString* copy) {
- size_t len;
- const char* ptr = this->readString(&len);
- if (copy) {
- copy->set(ptr, len);
- }
- return len;
- }
- void SkWriter32::writeString(const char str[], size_t len) {
- if (nullptr == str) {
- str = "";
- len = 0;
- }
- if ((long)len < 0) {
- len = strlen(str);
- }
- // [ 4 byte len ] [ str ... ] [1 - 4 \0s]
- uint32_t* ptr = this->reservePad(sizeof(uint32_t) + len + 1);
- *ptr = SkToU32(len);
- char* chars = (char*)(ptr + 1);
- memcpy(chars, str, len);
- chars[len] = '\0';
- }
- size_t SkWriter32::WriteStringSize(const char* str, size_t len) {
- if ((long)len < 0) {
- SkASSERT(str);
- len = strlen(str);
- }
- const size_t lenBytes = 4; // we use 4 bytes to record the length
- // add 1 since we also write a terminating 0
- return SkAlign4(lenBytes + len + 1);
- }
- void SkWriter32::growToAtLeast(size_t size) {
- const bool wasExternal = (fExternal != nullptr) && (fData == fExternal);
- fCapacity = 4096 + SkTMax(size, fCapacity + (fCapacity / 2));
- fInternal.realloc(fCapacity);
- fData = fInternal.get();
- if (wasExternal) {
- // we were external, so copy in the data
- memcpy(fData, fExternal, fUsed);
- }
- }
- sk_sp<SkData> SkWriter32::snapshotAsData() const {
- return SkData::MakeWithCopy(fData, fUsed);
- }
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