dmcallis
65a0592776
Source code drop for the Actionscript virtual machine in the Adobe Flash Player for December 2013
82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 4 -*- */
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/* vi: set ts=4 sw=4 expandtab: (add to ~/.vimrc: set modeline modelines=5) */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __avmplus_StringBuffer__
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#define __avmplus_StringBuffer__
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namespace avmplus
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{
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/**
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* StringBuffer is a PrintWriter subclass which enables easy, cout-like output of
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* text to a string buffer in memory.
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*
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* NOTE! This is *not* a GC class. A StringBuffer instance *must* be allocated
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* on the stack, inside GCRoots, or inside GC'd objects (as a member, not a pointer).
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*
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* A StringBuffer has a destructor which will free resouces opportunistically,
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* but if an exception jumps over the destructor then resources will not leak.
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*/
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class StringBuffer : public PrintWriter
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{
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public:
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StringBuffer(AvmCore* core)
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: PrintWriter(core)
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, m_stream(core->gc)
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{
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setOutputStream(&m_stream);
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}
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void writeN(const char* utf8, size_t count);
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const char* c_str() { return m_stream.c_str(); } // note, always in UTF8 form
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int length() const { return m_stream.length(); }
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void reset() { m_stream.reset(); }
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String* toString() { return core()->newStringUTF8(c_str(), length()); }
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private:
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/**
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* StringOutputStream accumulates any data written to the stream into an in-memory buffer.
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* The buffer can later be retrieved using the c_str method.
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*
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* NOTE! This is *not* a GC object. You *must* ensure that the destructor of this object
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* is called in order to properly deallocate resources.
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*
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* lhansen made StringOutputStream a private class of StringBuffer on 2011-02-26 because
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* StringBuffer is the only client of StringOutputStream in the entire Flash Player source tree.
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*/
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class StringOutputStream : public NonGCOutputStream
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{
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public:
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StringOutputStream(MMgc::GC *gc);
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~StringOutputStream();
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const char* c_str() { return m_buffer; } // note, always in UTF8 form
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int length() const { return m_length; }
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void reset() { m_length=0; }
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void write(const char* utf8);
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void writeN(const char* utf8, size_t count);
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private:
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enum { kInitialCapacity = 256 };
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void ensureCapacity(size_t count);
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MMgc::GC* m_gc;
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char* m_buffer; // managed memory
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int m_length;
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void grow(int newLength);
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};
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StringOutputStream m_stream;
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};
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}
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#endif /* __avmplus_StringBuffer__ */
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