tool/packer.cpp

   1 #include <msp/datafile/parser.h>
   2 #include <msp/datafile/statement.h>
   3 #include <msp/datafile/writer.h>
   4 #include <msp/fs/utils.h>
   5 #include <msp/io/memory.h>
   6 #include <msp/strings/format.h>
   7 #include "packer.h"
   8 #include "tool.h"
   9
  10 using namespace std;
  11 using namespace Msp;
  12
  13 Packer::Packer(DataTool &t):
  14         tool(t),
  15         tmp_file(tempfile()),
  16         dir_alloc(0)
  17 { }
  18
  19 IO::BufferedFile *Packer::tempfile()
  20 {
  21         FS::Path tmpdir;
  22         const char *tmp_env = getenv("TMPDIR");
  23         if(tmp_env)
  24                 tmpdir = tmp_env;
  25         else
  26                 tmpdir = "/tmp";
  27
  28         for(unsigned i=0;; ++i)
  29         {
  30                 try
  31                 {
  32                         FS::Path filename = tmpdir/format("mspdatatool.%d", i);
  33                         IO::BufferedFile *file = new IO::BufferedFile(filename.str(), IO::M_RDWR, IO::File::C_NEW);
  34                         FS::unlink(filename.str());
  35                         return file;
  36                 }
  37                 catch(const IO::file_already_exists &)
  38                 {
  39                         continue;
  40                 }
  41         }
  42 }
  43
  44 Packer::~Packer()
  45 {
  46         delete tmp_file;
  47 }
  48
  49 void Packer::pack_file(const string &fn)
  50 {
  51         if(!tmp_file)
  52                 throw logic_error("Packer::pack_file");
  53
  54         IO::SeekOffset offset = tmp_file->tell();
  55
  56         IO::BufferedFile in(fn);
  57         ObjectList objects;
  58         if(detect_data(in))
  59                 transfer_datafile(in, fn, *tmp_file, objects);
  60         else
  61                 transfer_unknown(in, *tmp_file);
  62
  63         unsigned length = tmp_file->tell()-offset;
  64
  65         DataFile::Statement st("file");
  66         st.append(FS::basename(fn));
  67         st.sub.push_back((DataFile::Statement("slice"), offset, length));
  68         for(list<Object>::const_iterator i=objects.begin(); i!=objects.end(); ++i)
  69                 st.sub.push_back((DataFile::Statement("object"), i->name, i->keyword));
  70         directory.push_back(st);
  71         dir_alloc += 100+objects.size()*100;
  72 }
  73
  74 bool Packer::detect_data(IO::Seekable &in)
  75 {
  76         IO::SeekOffset offset = in.tell();
  77         bool data = true;
  78         DataFile::Parser parser(in, "-");
  79         while(data && parser && in.tell()<10240)
  80         {
  81                 try
  82                 {
  83                         parser.parse();
  84                 }
  85                 catch(...)
  86                 {
  87                         data = false;
  88                 }
  89         }
  90         in.seek(offset, IO::S_BEG);
  91         return data;
  92 }
  93
  94 void Packer::transfer_datafile(IO::Base &in, const string &fn, IO::Base &out, ObjectList &objects)
  95 {
  96         DataFile::Parser parser(in, fn);
  97
  98         DataFile::Writer *writer = tool.create_writer(out);
  99
 100         bool collection = FS::extpart(fn)==".mdc";
 101         while(parser)
 102         {
 103                 DataFile::Statement st = parser.parse(true);
 104                 if(st.valid)
 105                 {
 106                         if(collection && !st.control)
 107                         {
 108                                 if(st.get_signature()=="s")
 109                                 {
 110                                         Object obj;
 111                                         obj.name = st.args[0].get<string>();
 112                                         obj.keyword = st.keyword;
 113                                         objects.push_back(obj);
 114                                 }
 115                                 else
 116                                         collection = false;
 117                         }
 118                         if(!st.control || st.keyword=="__src")
 119                                 writer->write(st);
 120                 }
 121         }
 122         writer->write(DataFile::Statement("__end"));
 123         delete writer;
 124 }
 125
 126 void Packer::transfer_unknown(IO::Base &in, IO::Base &out)
 127 {
 128         while(!in.eof())
 129         {
 130                 char buf[4096];
 131                 unsigned len = in.read(buf, sizeof(buf));
 132                 if(len==0)
 133                         break;
 134                 out.write(buf, len);
 135         }
 136 }
 137
 138 void Packer::create_pack(const string &fn)
 139 {
 140         vector<char> dir_buffer(dir_alloc);
 141         IO::Memory mem(&dir_buffer[0], dir_buffer.size(), IO::M_WRITE);
 142
 143         unsigned base_offset = 0;
 144         while(1)
 145         {
 146                 mem.seek(0, IO::S_BEG);
 147
 148                 DataFile::Writer *writer = tool.create_writer(mem);
 149
 150                 for(list<DataFile::Statement>::const_iterator i=directory.begin(); i!=directory.end(); ++i)
 151                         writer->write(*i);
 152                 if(base_offset==0)
 153                         base_offset = mem.tell();
 154                 writer->write((DataFile::Statement("base_offset"), base_offset));
 155                 writer->write(DataFile::Statement("__end"));
 156                 delete writer;
 157
 158                 unsigned dir_size = mem.tell();
 159                 if(dir_size<=base_offset)
 160                         break;
 161                 base_offset = dir_size;
 162         }
 163
 164         IO::File out(fn, IO::M_WRITE);
 165         out.write(&dir_buffer[0], base_offset);
 166         tmp_file->seek(0, IO::S_BEG);
 167         unsigned bufsize = 1048576;
 168         char *buf = new char[bufsize];
 169         while(!tmp_file->eof())
 170         {
 171                 unsigned len = tmp_file->read(buf, bufsize);
 172                 if(!len)
 173                         break;
 174                 out.write(buf, len);
 175         }
 176         delete[] buf;
 177 }