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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 "SkReader32.h"
#include "SkString.h"
#include "SkWriter32.h"
/*
* 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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