shell/FileClass.cpp

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  39
  40
  41 #include "avmshell.h"
  42
  43 namespace avmshell
  44 {
  45     FileClass::FileClass(VTable *cvtable)
  46         : ClassClosure(cvtable)
  47     {
  48         createVanillaPrototype();
  49     }
  50
  51     bool FileClass::exists(Stringp filename)
  52     {
  53         if (!filename) {
  54             toplevel()->throwArgumentError(kNullArgumentError, "filename");
  55         }
  56
  57         bool result = false;
  58
  59         StUTF8String filenameUTF8(filename);
  60         File* fp = Platform::GetInstance()->createFile();
  61         if(fp)
  62         {
  63             if (fp->open(filenameUTF8.c_str(), File::OPEN_READ)) {
  64                 result = true;
  65                 fp->close();
  66             }
  67             Platform::GetInstance()->destroyFile(fp);
  68         }
  69         return result;
  70     }
  71
  72     Stringp FileClass::read(Stringp filename)
  73     {
  74         Toplevel* toplevel = this->toplevel();
  75         AvmCore* core = this->core();
  76
  77         if (!filename) {
  78             toplevel->throwArgumentError(kNullArgumentError, "filename");
  79         }
  80         StUTF8String filenameUTF8(filename);
  81         File* fp = Platform::GetInstance()->createFile();
  82         if(!fp || !fp->open(filenameUTF8.c_str(), File::OPEN_READ))
  83         {
  84             if(fp)
  85             {
  86                 Platform::GetInstance()->destroyFile(fp);
  87             }
  88
  89             toplevel->throwError(kFileOpenError, filename);
  90         }
  91
  92         int64_t fileSize = fp->size();
  93         if(fileSize >= (int64_t)INT32_T_MAX) //File APIs cannot handle files > 2GB
  94         {
  95             toplevel->throwRangeError(kOutOfRangeError, filename);
  96         }
  97
  98         int len = (int)fileSize;
  99
 100         // Avoid VMPI_alloca - the buffer can be large and the memory is non-pointer-containing,
 101         // but the GC will scan it conservatively.
 102         uint8_t* c = (uint8_t*)core->gc->Alloc(len+1);
 103
 104         len = (int)fp->read(c, len); //need to force since the string creation functions expect an int
 105         c[len] = 0;
 106
 107         fp->close();
 108         Platform::GetInstance()->destroyFile(fp);
 109
 110         Stringp ret = NULL;
 111
 112         if (len >= 3)
 113         {
 114             // UTF8 BOM
 115             if ((c[0] == 0xef) && (c[1] == 0xbb) && (c[2] == 0xbf))
 116             {
 117                 ret = core->newStringUTF8((const char*)c + 3, len - 3);
 118             }
 119             else if ((c[0] == 0xfe) && (c[1] == 0xff))
 120             {
 121                 //UTF-16 big endian
 122                 c += 2;
 123                 len = (len - 2) >> 1;
 124                 ret = core->newStringEndianUTF16(/*littleEndian*/false, (wchar*)(void*)c, len);
 125             }
 126             else if ((c[0] == 0xff) && (c[1] == 0xfe))
 127             {
 128                 //UTF-16 little endian
 129                 c += 2;
 130                 len = (len - 2) >> 1;
 131                 ret = core->newStringEndianUTF16(/*littleEndian*/true, (wchar*)(void*)c, len);
 132             }
 133         }
 134
 135         if (ret == NULL)
 136         {
 137             // Use newStringUTF8() with "strict" explicitly set to false to mimick old,
 138             // buggy behavior, where malformed UTF-8 sequences are stored as single characters.
 139             ret = core->newStringUTF8((const char*)c, len, false);
 140         }
 141
 142         core->gc->Free(c);
 143         return ret;
 144     }
 145
 146     void FileClass::write(Stringp filename,
 147                           Stringp data)
 148     {
 149         Toplevel* toplevel = this->toplevel();
 150
 151         if (!filename) {
 152             toplevel->throwArgumentError(kNullArgumentError, "filename");
 153         }
 154         if (!data) {
 155             toplevel->throwArgumentError(kNullArgumentError, "data");
 156         }
 157         StUTF8String filenameUTF8(filename);
 158         File* fp = Platform::GetInstance()->createFile();
 159         if (!fp || !fp->open(filenameUTF8.c_str(), File::OPEN_WRITE))
 160         {
 161             if(fp)
 162             {
 163                 Platform::GetInstance()->destroyFile(fp);
 164             }
 165             toplevel->throwError(kFileWriteError, filename);
 166         }
 167         StUTF8String dataUTF8(data);
 168         if ((int32_t)fp->write(dataUTF8.c_str(), dataUTF8.length()) != dataUTF8.length()) {
 169             toplevel->throwError(kFileWriteError, filename);
 170         }
 171         fp->close();
 172         Platform::GetInstance()->destroyFile(fp);
 173     }
 174
 175     ByteArrayObject* FileClass::readByteArray(Stringp filename)
 176     {
 177         Toplevel* toplevel = this->toplevel();
 178         if (!filename) {
 179             toplevel->throwArgumentError(kNullArgumentError, "filename");
 180         }
 181         StUTF8String filenameUTF8(filename);
 182
 183         File* fp = Platform::GetInstance()->createFile();
 184         if (fp == NULL || !fp->open(filenameUTF8.c_str(), File::OPEN_READ_BINARY))
 185         {
 186             if(fp)
 187             {
 188                 Platform::GetInstance()->destroyFile(fp);
 189             }
 190             toplevel->throwError(kFileOpenError, filename);
 191         }
 192
 193         int64_t len = fp->size();
 194         if((uint64_t)len >= UINT32_T_MAX) //ByteArray APIs cannot handle files > 4GB
 195         {
 196             toplevel->throwRangeError(kOutOfRangeError, filename);
 197         }
 198
 199         uint32_t readCount = (uint32_t)len;
 200
 201         unsigned char *c = mmfx_new_array( unsigned char, readCount+1);
 202
 203         ByteArrayObject* b = toplevel->byteArrayClass()->constructByteArray();
 204         b->set_length(0);
 205
 206         while (readCount > 0)
 207         {
 208             uint32_t actual = (uint32_t) fp->read(c, readCount);
 209             if (actual > 0)
 210             {
 211                 b->GetByteArray().Write(c, actual);
 212                 readCount -= readCount;
 213             }
 214             else
 215             {
 216                 break;
 217             }
 218         }
 219         b->set_position(0);
 220
 221         mmfx_delete_array( c );
 222
 223         fp->close();
 224         Platform::GetInstance()->destroyFile(fp);
 225
 226         return b;
 227     }
 228
 229     bool FileClass::writeByteArray(Stringp filename, ByteArrayObject* bytes)
 230     {
 231         Toplevel* toplevel = this->toplevel();
 232         if (!filename) {
 233             toplevel->throwArgumentError(kNullArgumentError, "filename");
 234         }
 235
 236         StUTF8String filenameUTF8(filename);
 237
 238         File* fp = Platform::GetInstance()->createFile();
 239         if (fp == NULL || !fp->open(filenameUTF8.c_str(), File::OPEN_WRITE_BINARY))
 240         {
 241             if(fp)
 242             {
 243                 Platform::GetInstance()->destroyFile(fp);
 244             }
 245             toplevel->throwError(kFileWriteError, filename);
 246         }
 247
 248         int32_t len = bytes->get_length();
 249         bool success = (int32_t)fp->write(&(bytes->GetByteArray())[0], len) == len;
 250
 251         fp->close();
 252         Platform::GetInstance()->destroyFile(fp);
 253
 254         if (!success) {
 255             toplevel->throwError(kFileWriteError, filename);
 256         }
 257
 258         return true;
 259     }
 260
 261 }