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Added the "--add=[model]" option for upcoming iRiver work. Rockbox for iRiver

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will not be scrambled, only have a 8 bytes header for checksum and model name.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5650 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Daniel Stenberg 2005-01-24 13:14:14 +00:00
parent adaae249ef
commit bf355b70b9
1 changed files with 58 additions and 5 deletions
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63
tools/scramble.c
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@ -49,6 +49,8 @@ void usage(void)
"\t-neo SSI Neo format\n"
"\t-mm=X Archos Multimedia format (X values: A=JBMM, B=AV1xx, C=AV3xx)\n"
"\t-iriver iRiver format\n"
"\t-add=X Rockbox iRiver \"add-up\" checksum format\n"
"\t (X values: h100, h120, h140, h300)\n"
"\nNo option results in Archos standard player/recorder format.\n");
exit(1);
@ -59,6 +61,7 @@ int main (int argc, char** argv)
unsigned long length,i,slen;
unsigned char *inbuf,*outbuf;
unsigned short crc=0;
unsigned long crc32=0; /* 32 bit checksum */
unsigned char header[24];
unsigned char *iname = argv[1];
unsigned char *oname = argv[2];
@ -66,7 +69,9 @@ int main (int argc, char** argv)
int headerlen = 6;
FILE* file;
int version;
enum { none, scramble, xor } method = scramble;
unsigned long irivernum;
char irivermodel[5];
enum { none, scramble, xor, add } method = scramble;
if (argc < 3) {
usage();
@ -119,6 +124,29 @@ int main (int argc, char** argv)
return -1;
}
}
else if(!strncmp(argv[1], "-add=", 5)) {
iname = argv[2];
oname = argv[3];
method = add;
if(!strcmp(&argv[1][5], "h120"))
irivernum = 0;
else if(!strcmp(&argv[1][5], "h140"))
irivernum = 0; /* the same as the h120 */
else if(!strcmp(&argv[1][5], "h140"))
irivernum = 0; /* the same as the h120 */
else if(!strcmp(&argv[1][5], "h100"))
irivernum = 1;
else if(!strcmp(&argv[1][5], "h300"))
irivernum = 2;
else {
fprintf(stderr, "unsupported model: %s\n", &argv[1][5]);
return 2;
}
/* we store a 4-letter model name too, for humans */
strcpy(irivermodel, &argv[1][5]);
crc32 = irivernum; /* start checksum calcs with this */
}
else if(!strcmp(argv[1], "-iriver")) {
/* iRiver code dealt with in the iriver.c code */
@ -148,12 +176,19 @@ int main (int argc, char** argv)
inbuf = malloc(length);
if (method == xor)
outbuf = malloc(length*2);
else if(method == add)
outbuf = malloc(length + 8);
else
outbuf = malloc(length);
if ( !inbuf || !outbuf ) {
printf("out of memory!\n");
return -1;
}
if(length> 4) {
/* zero-fill the last 4 bytes to make sure there's no rubbish there
when we write the size-aligned file later */
memset(outbuf+length-4, 0, 4);
}
/* read file */
i=fread(inbuf,1,length,file);
@ -165,6 +200,13 @@ int main (int argc, char** argv)
switch (method)
{
case add:
for (i = 0; i < length/2; i++) {
unsigned short *inbuf16 = (unsigned short *)inbuf;
/* add 16 unsigned bits but keep a 32 bit sum */
crc32 += inbuf16[i];
}
break;
case scramble:
slen = length/4;
for (i = 0; i < length; i++) {
@ -185,14 +227,25 @@ int main (int argc, char** argv)
}
break;
}
/* calculate checksum */
for (i=0;i<length;i++)
crc += inbuf[i];
if(method != add) {
/* calculate checksum */
for (i=0;i<length;i++)
crc += inbuf[i];
}
memset(header, 0, sizeof header);
switch (method)
{
case add:
{
unsigned long *headp = (unsigned long *)header;
headp[0] = crc32; /* checksum */
memcpy(&header[4], irivermodel, 4); /* 4 bytes model name */
memcpy(outbuf, inbuf, length); /* the input buffer to output*/
headerlen = 8;
}
break;
case scramble:
if (headerlen == 6) {
int2be(length, header);