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The checksum is not a CRC

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5686 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2005-01-28 10:28:34 +00:00
parent c47fadb112
commit ddd1551d3e
1 changed files with 4 additions and 4 deletions
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8
tools/scramble.c
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@ -61,7 +61,7 @@ int main (int argc, char** argv)
unsigned long length,i,slen; unsigned long length,i,slen;
unsigned char *inbuf,*outbuf; unsigned char *inbuf,*outbuf;
unsigned short crc=0; unsigned short crc=0;
unsigned long crc32=0; /* 32 bit checksum */ unsigned long chksum=0; /* 32 bit checksum */
unsigned char header[24]; unsigned char header[24];
unsigned char *iname = argv[1]; unsigned char *iname = argv[1];
unsigned char *oname = argv[2]; unsigned char *oname = argv[2];
@ -143,7 +143,7 @@ int main (int argc, char** argv)
} }
/* we store a 4-letter model name too, for humans */ /* we store a 4-letter model name too, for humans */
strcpy(irivermodel, &argv[1][5]); strcpy(irivermodel, &argv[1][5]);
crc32 = irivernum; /* start checksum calcs with this */ chksum = irivernum; /* start checksum calcs with this */
} }
else if(!strcmp(argv[1], "-iriver")) { else if(!strcmp(argv[1], "-iriver")) {
@ -202,7 +202,7 @@ int main (int argc, char** argv)
for (i = 0; i < length/2; i++) { for (i = 0; i < length/2; i++) {
unsigned short *inbuf16 = (unsigned short *)inbuf; unsigned short *inbuf16 = (unsigned short *)inbuf;
/* add 16 unsigned bits but keep a 32 bit sum */ /* add 16 unsigned bits but keep a 32 bit sum */
crc32 += inbuf16[i]; chksum += inbuf16[i];
} }
break; break;
case scramble: case scramble:
@ -237,7 +237,7 @@ int main (int argc, char** argv)
{ {
case add: case add:
{ {
int2be(crc32, header); /* checksum, big-endian */ int2be(chksum, header); /* checksum, big-endian */
memcpy(&header[4], irivermodel, 4); /* 4 bytes model name */ memcpy(&header[4], irivermodel, 4); /* 4 bytes model name */
memcpy(outbuf, inbuf, length); /* the input buffer to output*/ memcpy(outbuf, inbuf, length); /* the input buffer to output*/
headerlen = 8; headerlen = 8;