Difference between revisions of "News Channel"
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(interesting website root) |
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| Line 22: | Line 22: | ||
$0000 - $003F: padding (00) | $0000 - $003F: padding (00) | ||
$0040 - $013F: rsa encrypted sha-1 signature of rest of the file | $0040 - $013F: rsa encrypted sha-1 signature of rest of the file | ||
| − | $0140 - $....: compressed data | + | $0140 - $0143: header |
| + | $0144 - .....: compressed data | ||
</pre> | </pre> | ||
| − | + | The compression is very simple: | |
| + | # Read one byte | ||
| + | # For each bit of the byte, msb-to-lsb, | ||
| + | #* if 0, copy one byte to the output | ||
| + | #* if 1, read 16 bits msb first in v, copy n bytes at offset m from the end of the output, n=3+(v>>12), m=v & fff | ||
| + | |||
| + | Quick and very dirty C code: | ||
| + | i = 0x144; | ||
| + | j = 0; | ||
| + | while(i < size) { | ||
| + | int k; | ||
| + | int v = data[i++]; | ||
| + | for(k=0; k<8; k++) | ||
| + | if(!(v & (1 << (7-k)))) { | ||
| + | result_data[j++] = data[i++]; | ||
| + | } else { | ||
| + | int vv = (data[i] << 8) | data[i+1]; | ||
| + | int nb = 3+(vv >> 12); | ||
| + | int off = (vv & 0xfff); | ||
| + | int l; | ||
| + | i+=2; | ||
| + | for(l=0; l<nb; l++) { | ||
| + | result_data[j] = result_data[j-off-1]; | ||
| + | j++; | ||
| + | } | ||
| + | } | ||
| + | } | ||
[[Category:Software]][[Category:Wii channel]] | [[Category:Software]][[Category:Wii channel]] | ||
Revision as of 18:44, 17 March 2008
The News and Forecast channels download data packages from Nintendo servers via plain http connection.
Some examples:
http://weather.wapp.wii.com/1/076/short.bin http://weather.wapp.wii.com/1/076/forecast.bin http://news.wapp.wii.com/1/076/news.bin.08
Nowadays, it seems the news file has moved:
http://news.wapp.wii.com/v2/1/076/news.bin.00
...
http://news.wapp.wii.com/v2/1/076/news.bin.23
http://news.wapp.wii.com/ displays a Red Hat Enterprise Linux Test Page
File structure:
$0000 - $003F: padding (00) $0040 - $013F: rsa encrypted sha-1 signature of rest of the file $0140 - $0143: header $0144 - .....: compressed data
The compression is very simple:
- Read one byte
- For each bit of the byte, msb-to-lsb,
- if 0, copy one byte to the output
- if 1, read 16 bits msb first in v, copy n bytes at offset m from the end of the output, n=3+(v>>12), m=v & fff
Quick and very dirty C code:
i = 0x144;
j = 0;
while(i < size) {
int k;
int v = data[i++];
for(k=0; k<8; k++)
if(!(v & (1 << (7-k)))) {
result_data[j++] = data[i++];
} else {
int vv = (data[i] << 8) | data[i+1];
int nb = 3+(vv >> 12);
int off = (vv & 0xfff);
int l;
i+=2;
for(l=0; l<nb; l++) {
result_data[j] = result_data[j-off-1];
j++;
}
}
}