root/shell/FileClass.cpp

DEFINITIONS

1. exists
2. read
3. write

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is [Open Source Virtual Machine.].
 *
 * The Initial Developer of the Original Code is
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 * the Initial Developer. All Rights Reserved.
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 *   Adobe AS3 Team
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#include "avmshell.h"

namespace avmshell
{
        FileClass::FileClass(VTable *cvtable)
                : ClassClosure(cvtable)
    {
                createVanillaPrototype();
        }

        bool FileClass::exists(Stringp filename)
        {
                if (!filename) {
                        toplevel()->throwArgumentError(kNullArgumentError, "filename");
                }
                
                bool result = false;

                StUTF8String filenameUTF8(filename);
                File* fp = Platform::GetInstance()->createFile();
                if(fp)
                {
                        if (fp->open(filenameUTF8.c_str(), File::OPEN_READ)) {
                                result = true;
                                fp->close();
                        }
                        Platform::GetInstance()->destroyFile(fp);
                }
                return result;
        }

        Stringp FileClass::read(Stringp filename)
        {
                Toplevel* toplevel = this->toplevel();
                AvmCore* core = this->core();

                if (!filename) {
                        toplevel->throwArgumentError(kNullArgumentError, "filename");
                }
                StUTF8String filenameUTF8(filename);
                File* fp = Platform::GetInstance()->createFile();
                if(!fp || !fp->open(filenameUTF8.c_str(), File::OPEN_READ))
                {
                        if(fp)
                        {
                                Platform::GetInstance()->destroyFile(fp);
                        }

                        toplevel->throwError(kFileOpenError, filename);
                }

                int64_t fileSize = fp->size();
                if(fileSize >= (int64_t)INT32_T_MAX) //File APIs cannot handle files > 2GB
                {
                        toplevel->throwRangeError(kOutOfRangeError, filename);
                }

                int len = (int)fileSize;

                MMgc::GC::AllocaAutoPtr _c;
                union {
                        uint8_t* c;
                        wchar* c_w;
                };
                c = (uint8_t*)VMPI_alloca(core, _c, len+1);

                len = (int)fp->read(c, len); //need to force since the string creation functions expect an int
                c[len] = 0;
                
                fp->close();
                Platform::GetInstance()->destroyFile(fp);

                if (len >= 3)
                {
                        // UTF8 BOM
                        if ((c[0] == 0xef) && (c[1] == 0xbb) && (c[2] == 0xbf))
                        {
                                return core->newStringUTF8((const char*)c + 3, len - 3);
                        }
                        else if ((c[0] == 0xfe) && (c[1] == 0xff))
                        {
                                //UTF-16 big endian
                                c += 2;
                                len = (len - 2) >> 1;
                                return core->newStringEndianUTF16(/*littleEndian*/false, c_w, len);
                        }
                        else if ((c[0] == 0xff) && (c[1] == 0xfe))
                        {
                                //UTF-16 little endian
                                c += 2;
                                len = (len - 2) >> 1;
                                return core->newStringEndianUTF16(/*littleEndian*/true, c_w, len);
                        }
                }

                // Use newStringUTF8() with "strict" explicitly set to false to mimick old,
                // buggy behavior, where malformed UTF-8 sequences are stored as single characters.
                return core->newStringUTF8((const char*)c, len, false);
        }

        void FileClass::write(Stringp filename,
                                                  Stringp data)
        {
                Toplevel* toplevel = this->toplevel();

                if (!filename) {
                        toplevel->throwArgumentError(kNullArgumentError, "filename");
                }
                if (!data) {
                        toplevel->throwArgumentError(kNullArgumentError, "data");
                }
                StUTF8String filenameUTF8(filename);
                File* fp = Platform::GetInstance()->createFile();
                if (!fp || !fp->open(filenameUTF8.c_str(), File::OPEN_WRITE)) 
                {
                        if(fp)
                        {
                                Platform::GetInstance()->destroyFile(fp);
                        }
                        toplevel->throwError(kFileWriteError, filename);
                }
                StUTF8String dataUTF8(data);
                if ((int32_t)fp->write(dataUTF8.c_str(), dataUTF8.length()) != dataUTF8.length()) {
                        toplevel->throwError(kFileWriteError, filename);
                }
                fp->close();
                Platform::GetInstance()->destroyFile(fp);
        }
}