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         tmp_buf(new IO::Buffered(*tmp_file)),
  17         dir_alloc(0)
  18 { }
  19
  20 IO::File *Packer::tempfile()
  21 {
  22         for(unsigned i=0;; ++i)
  23         {
  24                 try
  25                 {
  26                         std::string filename = format("/tmp/mspdatatool.%d", i);
  27                         /*filename.reserve(25);
  28                         filename.append("/tmp/mspdatatool.");
  29                         for(unsigned i=0; i<8; ++i)
  30                                 filename.append(rand());*/
  31                         IO::File *file = new IO::File(filename, IO::M_RDWR, IO::File::C_NEW);
  32                         FS::unlink(filename);
  33                         return file;
  34                 }
  35                 catch(const IO::file_already_exists &)
  36                 {
  37                         continue;
  38                 }
  39         }
  40 }
  41
  42 Packer::~Packer()
  43 {
  44         delete tmp_buf;
  45         delete tmp_file;
  46 }
  47
  48 void Packer::pack_file(const string &fn)
  49 {
  50         if(!tmp_file)
  51                 throw logic_error("Packer::pack_file");
  52
  53         unsigned offset = tmp_file->tell();
  54
  55         IO::BufferedFile in(fn);
  56         DataFile::Parser parser(in, fn);
  57
  58         DataFile::Writer *writer = tool.create_writer(*tmp_buf);
  59
  60         bool collection = FS::extpart(fn)==".mdc";
  61         std::list<Object> objects;
  62         while(parser)
  63         {
  64                 DataFile::Statement st = parser.parse(true);
  65                 if(st.valid)
  66                 {
  67                         bool sys = !st.keyword.compare(0, 2, "__");
  68                         if(collection && !sys)
  69                         {
  70                                 if(st.get_signature()=="s")
  71                                 {
  72                                         Object obj;
  73                                         obj.name = st.args[0].get<string>();
  74                                         obj.keyword = st.keyword;
  75                                         objects.push_back(obj);
  76                                 }
  77                                 else
  78                                         collection = false;
  79                         }
  80                         if(!sys || st.keyword=="__src")
  81                                 writer->write(st);
  82                 }
  83         }
  84         writer->write(DataFile::Statement("__end"));
  85         delete writer;
  86
  87         tmp_buf->flush();
  88         unsigned length = tmp_file->tell()-offset;
  89
  90         DataFile::Statement st("file");
  91         st.append(FS::basename(fn));
  92         st.sub.push_back((DataFile::Statement("slice"), offset, length));
  93         if(collection)
  94         {
  95                 for(list<Object>::const_iterator i=objects.begin(); i!=objects.end(); ++i)
  96                         st.sub.push_back((DataFile::Statement("object"), i->name, i->keyword));
  97                 dir_alloc += objects.size()*100;
  98         }
  99         directory.push_back(st);
 100         dir_alloc += 100;
 101 }
 102
 103 void Packer::create_pack(const string &fn)
 104 {
 105         vector<char> dir_buffer(dir_alloc);
 106         IO::Memory mem(&dir_buffer[0], dir_buffer.size(), IO::M_WRITE);
 107
 108         unsigned base_offset = 0;
 109         while(1)
 110         {
 111                 mem.seek(0, IO::S_BEG);
 112
 113                 DataFile::Writer *writer = tool.create_writer(mem);
 114
 115                 for(list<DataFile::Statement>::const_iterator i=directory.begin(); i!=directory.end(); ++i)
 116                         writer->write(*i);
 117                 if(base_offset==0)
 118                         base_offset = mem.tell();
 119                 writer->write((DataFile::Statement("base_offset"), base_offset));
 120                 writer->write(DataFile::Statement("__end"));
 121                 delete writer;
 122
 123                 unsigned dir_size = mem.tell();
 124                 if(dir_size<=base_offset)
 125                         break;
 126                 base_offset = dir_size;
 127         }
 128
 129         IO::File out(fn, IO::M_WRITE);
 130         out.write(&dir_buffer[0], base_offset);
 131         tmp_file->seek(0, IO::S_BEG);
 132         while(!tmp_file->eof())
 133         {
 134                 char buf[16384];
 135                 unsigned len = tmp_file->read(buf, sizeof(buf));
 136                 if(!len)
 137                         break;
 138                 out.write(buf, len);
 139         }
 140 }