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         MMgc::GC::AllocaAutoPtr _c;
 101         union {
 102             uint8_t* c;
 103             wchar* c_w;
 104         };
 105         c = (uint8_t*)VMPI_alloca(core, _c, len+1);
 106
 107         len = (int)fp->read(c, len); //need to force since the string creation functions expect an int
 108         c[len] = 0;
 109
 110         fp->close();
 111         Platform::GetInstance()->destroyFile(fp);
 112
 113         if (len >= 3)
 114         {
 115             // UTF8 BOM
 116             if ((c[0] == 0xef) && (c[1] == 0xbb) && (c[2] == 0xbf))
 117             {
 118                 return core->newStringUTF8((const char*)c + 3, len - 3);
 119             }
 120             else if ((c[0] == 0xfe) && (c[1] == 0xff))
 121             {
 122                 //UTF-16 big endian
 123                 c += 2;
 124                 len = (len - 2) >> 1;
 125                 return core->newStringEndianUTF16(/*littleEndian*/false, c_w, len);
 126             }
 127             else if ((c[0] == 0xff) && (c[1] == 0xfe))
 128             {
 129                 //UTF-16 little endian
 130                 c += 2;
 131                 len = (len - 2) >> 1;
 132                 return core->newStringEndianUTF16(/*littleEndian*/true, c_w, len);
 133             }
 134         }
 135
 136         // Use newStringUTF8() with "strict" explicitly set to false to mimick old,
 137         // buggy behavior, where malformed UTF-8 sequences are stored as single characters.
 138         return core->newStringUTF8((const char*)c, len, false);
 139     }
 140
 141     void FileClass::write(Stringp filename,
 142                           Stringp data)
 143     {
 144         Toplevel* toplevel = this->toplevel();
 145
 146         if (!filename) {
 147             toplevel->throwArgumentError(kNullArgumentError, "filename");
 148         }
 149         if (!data) {
 150             toplevel->throwArgumentError(kNullArgumentError, "data");
 151         }
 152         StUTF8String filenameUTF8(filename);
 153         File* fp = Platform::GetInstance()->createFile();
 154         if (!fp || !fp->open(filenameUTF8.c_str(), File::OPEN_WRITE))
 155         {
 156             if(fp)
 157             {
 158                 Platform::GetInstance()->destroyFile(fp);
 159             }
 160             toplevel->throwError(kFileWriteError, filename);
 161         }
 162         StUTF8String dataUTF8(data);
 163         if ((int32_t)fp->write(dataUTF8.c_str(), dataUTF8.length()) != dataUTF8.length()) {
 164             toplevel->throwError(kFileWriteError, filename);
 165         }
 166         fp->close();
 167         Platform::GetInstance()->destroyFile(fp);
 168     }
 169 }