ddnet/src/engine/datafile.cpp

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2007-05-22 15:03:32 +00:00
#include <baselib/system.h>
#include <baselib/stream/file.h>
#include "datafile.h"
static const int DEBUG=0;
struct item_type
{
int type;
int start;
int num;
};
struct item
{
int type_and_id;
int size;
};
struct datafile_header
{
int id;
int version;
int size;
int swaplen;
int num_item_types;
int num_items;
int num_raw_data;
int item_size;
int data_size;
};
struct datafile_data
{
int num_item_types;
int num_items;
int num_raw_data;
int item_size;
int data_size;
char start[4];
};
struct datafile_info
{
item_type *item_types;
int *item_offsets;
int *data_offsets;
char *item_start;
char *data_start;
};
struct datafile
{
datafile_info info;
datafile_data data;
};
datafile *datafile_load(const char *filename)
{
dbg_msg("datafile", "datafile loading. filename='%s'", filename);
baselib::file_stream file;
if(!file.open_r(filename))
return 0;
// TODO: change this header
int header[4];
file.read(header, sizeof(header));
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if(((header[0]>>24)&0xff) != 'D' || ((header[0]>>16)&0xff) != 'A' || ((header[0]>>8)&0xff) != 'T' || (header[0]&0xff) != 'A')
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{
dbg_msg("datafile", "wrong signature. %x %x %x %x", header[0], header[1], header[2], header[3]);
return 0;
}
int version = header[1];
if(version != 3)
{
dbg_msg("datafile", "wrong version. version=%x", version);
return 0;
}
unsigned size = header[2];
unsigned swapsize = header[3];
if(DEBUG)
dbg_msg("datafile", "loading. size=%d", size);
// TODO: use this variable for good and awesome
(void)swapsize;
//map_unload();
datafile *df = (datafile*)mem_alloc(size+sizeof(datafile_info), 1);
unsigned readsize = file.read(&df->data, size);
if(readsize != size)
{
dbg_msg("datafile", "couldn't load the whole thing, wanted=%d got=%d", size, readsize);
return 0;
}
// TODO: byteswap
//map->byteswap();
if(DEBUG)
dbg_msg("datafile", "item_size=%d", df->data.item_size);
df->info.item_types = (item_type *)df->data.start;
df->info.item_offsets = (int *)&df->info.item_types[df->data.num_item_types];
df->info.data_offsets = (int *)&df->info.item_offsets[df->data.num_items];
df->info.item_start = (char *)&df->info.data_offsets[df->data.num_raw_data];
df->info.data_start = df->info.item_start + df->data.item_size;
if(DEBUG)
dbg_msg("datafile", "datafile loading done. datafile='%s'", filename);
if(DEBUG)
{
for(int i = 0; i < df->data.num_raw_data; i++)
{
void *p = datafile_get_data(df, i);
dbg_msg("datafile", "%d %d", (int)((char*)p - (char*)(&df->data)), size);
}
for(int i = 0; i < datafile_num_items(df); i++)
{
int type, id;
void *data = datafile_get_item(df, i, &type, &id);
dbg_msg("map", "\t%d: type=%x id=%x p=%p offset=%d", i, type, id, data, df->info.item_offsets[i]);
int *idata = (int*)data;
for(int k = 0; k < 3; k++)
dbg_msg("datafile", "\t\t%d=%d (%x)", k, idata[k], idata[k]);
}
for(int i = 0; i < df->data.num_item_types; i++)
{
dbg_msg("map", "\t%d: type=%x start=%d num=%d", i,
df->info.item_types[i].type,
df->info.item_types[i].start,
df->info.item_types[i].num);
for(int k = 0; k < df->info.item_types[i].num; k++)
{
int type, id;
datafile_get_item(df, df->info.item_types[i].start+k, &type, &id);
if(type != df->info.item_types[i].type)
dbg_msg("map", "\tERROR");
}
}
}
return df;
}
void *datafile_get_data(datafile *df, int index)
{
return df->info.data_start+df->info.data_offsets[index];
}
void *datafile_get_item(datafile *df, int index, int *type, int *id)
{
item *i = (item *)(df->info.item_start+df->info.item_offsets[index]);
if(type)
*type = (i->type_and_id>>16)&0xffff; // remove sign extention
if(id)
*id = i->type_and_id&0xffff;
return (void *)(i+1);
}
void datafile_get_type(datafile *df, int type, int *start, int *num)
{
for(int i = 0; i < df->data.num_item_types; i++)
{
if(df->info.item_types[i].type == type)
{
*start = df->info.item_types[i].start;
*num = df->info.item_types[i].num;
return;
}
}
*start = 0;
*num = 0;
}
void *datafile_find_item(datafile *df, int type, int id)
{
int start, num;
datafile_get_type(df, type, &start, &num);
for(int i = 0; i < num; i++)
{
int item_id;
void *item = datafile_get_item(df, start+i,0, &item_id);
if(id == item_id)
return item;
}
return 0;
}
int datafile_num_items(datafile *df)
{
return df->data.num_items;
}
void datafile_unload(datafile *df)
{
if(df)
mem_free(df);
}
// DATAFILE output
struct data_info
{
int size;
void *data;
};
struct item_info
{
int type;
int id;
int size;
int next;
int prev;
void *data;
};
struct itemtype_info
{
int num;
int first;
int last;
};
//
struct datafile_out
{
baselib::file_stream file;
int num_items;
int num_datas;
int num_item_types;
itemtype_info item_types[0xffff];
item_info items[1024];
data_info datas[1024];
};
datafile_out *datafile_create(const char *filename)
{
datafile_out *df = new datafile_out;
if(!df->file.open_w(filename))
{
delete df;
return 0;
}
df->num_items = 0;
df->num_datas = 0;
df->num_item_types = 0;
mem_zero(&df->item_types, sizeof(df->item_types));
for(int i = 0; i < 0xffff; i++)
{
df->item_types[i].first = -1;
df->item_types[i].last = -1;
}
return df;
}
int datafile_add_item(datafile_out *df, int type, int id, int size, void *data)
{
df->items[df->num_items].type = type;
df->items[df->num_items].id = id;
df->items[df->num_items].size = size;
// copy data
df->items[df->num_items].data = mem_alloc(size, 1);
mem_copy(df->items[df->num_items].data, data, size);
if(!df->item_types[type].num) // count item types
df->num_item_types++;
// link
df->items[df->num_items].prev = df->item_types[type].last;
df->items[df->num_items].next = -1;
if(df->item_types[type].last != -1)
df->items[df->item_types[type].last].next = df->num_items;
df->item_types[type].last = df->num_items;
if(df->item_types[type].first == -1)
df->item_types[type].first = df->num_items;
df->item_types[type].num++;
df->num_items++;
return df->num_items-1;
}
int datafile_add_data(datafile_out *df, int size, void *data)
{
df->datas[df->num_items].size = size;
df->datas[df->num_datas].data = data;
df->num_datas++;
return df->num_datas-1;
}
int datafile_finish(datafile_out *df)
{
// we should now write this file!
if(DEBUG)
dbg_msg("datafile", "writing");
// calculate sizes
int itemsize = 0;
for(int i = 0; i < df->num_items; i++)
{
if(DEBUG)
dbg_msg("datafile", "item=%d size=%d (%d)", i, df->items[i].size, df->items[i].size+sizeof(item));
itemsize += df->items[i].size + sizeof(item);
}
int datasize = 0;
for(int i = 0; i < df->num_datas; i++)
datasize += df->datas[i].size;
// calculate the complete size
int typessize = df->num_item_types*sizeof(item_type);
int headersize = sizeof(datafile_header);
int offsetsize = df->num_items*sizeof(int) + df->num_datas*sizeof(int);
int filesize = headersize + typessize + offsetsize + itemsize + datasize;
int swapsize = filesize - datasize;
if(DEBUG)
dbg_msg("datafile", "num_item_types=%d typessize=%d itemsize=%d datasize=%d", df->num_item_types, typessize, itemsize, datasize);
// construct header
datafile_header header;
header.id = ('D'<<24) | ('A'<<16) | ('T'<<8) | ('A');
header.version = 3;
header.size = filesize - 16;
header.swaplen = swapsize - 16;
header.num_item_types = df->num_item_types;
header.num_items = df->num_items;
header.num_raw_data = df->num_datas;
header.item_size = itemsize;
header.data_size = datasize;
// TODO: apply swapping
// write header
if(DEBUG)
dbg_msg("datafile", "headersize=%d", sizeof(header));
df->file.write(&header, sizeof(header));
// write types
for(int i = 0, count = 0; i < 0xffff; i++)
{
if(df->item_types[i].num)
{
// write info
item_type info;
info.type = i;
info.start = count;
info.num = df->item_types[i].num;
if(DEBUG)
dbg_msg("datafile", "writing type=%x start=%d num=%d", info.type, info.start, info.num);
df->file.write(&info, sizeof(info));
count += df->item_types[i].num;
}
}
// write item offsets
for(int i = 0, offset = 0; i < 0xffff; i++)
{
if(df->item_types[i].num)
{
// write all items in of this type
int k = df->item_types[i].first;
while(k != -1)
{
if(DEBUG)
dbg_msg("datafile", "writing item offset num=%d offset=%d", k, offset);
df->file.write(&offset, sizeof(offset));
offset += df->items[k].size + sizeof(item);
// next
k = df->items[k].next;
}
}
}
// write data offsets
for(int i = 0, offset = 0; i < df->num_datas; i++)
{
if(DEBUG)
dbg_msg("datafile", "writing data offset num=%d offset=%d", i, offset);
df->file.write(&offset, sizeof(offset));
offset += df->datas[i].size;
}
// write items
for(int i = 0; i < 0xffff; i++)
{
if(df->item_types[i].num)
{
// write all items in of this type
int k = df->item_types[i].first;
while(k != -1)
{
item itm;
itm.type_and_id = (i<<16)|df->items[k].id;
itm.size = df->items[k].size;
if(DEBUG)
dbg_msg("datafile", "writing item type=%x idx=%d id=%d size=%d", i, k, df->items[k].id, df->items[k].size);
df->file.write(&itm, sizeof(itm));
df->file.write(df->items[k].data, df->items[k].size);
// next
k = df->items[k].next;
}
}
}
// write data
for(int i = 0; i < df->num_datas; i++)
{
if(DEBUG)
dbg_msg("datafile", "writing data id=%d size=%d", i, df->datas[i].size);
df->file.write(df->datas[i].data, df->datas[i].size);
}
// free data
for(int i = 0; i < df->num_items; i++)
mem_free(df->items[i].data);
delete df;
if(DEBUG)
dbg_msg("datafile", "done");
return 0;
}