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Add JFFS2_COMPR_RTIME support #2

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Add JFFS2_COMPR_RTIME support #2

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38 changes: 38 additions & 0 deletions jffs2extract.c
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,38 @@ void visit(char *o, size_t size, const char *path, int verbose, visitor visitor)
/* writes file node into buffer, to the proper position. */
/* reading all valid nodes in version order reconstructs the file. */

static int jffs2_rtime_decompress(unsigned char *data_in,
unsigned char *cpage_out,
uint32_t srclen, uint32_t destlen)
{
short positions[256];
int outpos = 0;
int pos=0;
memset(positions,0,sizeof(positions));
while (outpos<destlen) {
unsigned char value;
int backoffs;
int repeat;
value = data_in[pos++];
cpage_out[outpos++] = value; /* first the verbatim copied byte */
repeat = data_in[pos++];
backoffs = positions[value];
positions[value]=outpos;
if (repeat) {
if (backoffs + repeat >= outpos) {
while(repeat) {
cpage_out[outpos++] = cpage_out[backoffs++];
repeat--;
}
} else {
memcpy(&cpage_out[outpos],&cpage_out[backoffs],repeat);
outpos+=repeat;
}
}
}
return 0;
}

/*
b - buffer
bsize - buffer size
Expand Down Expand Up @@ -126,6 +158,12 @@ void putblock(char *b, size_t bsize, size_t * rsize,
bzero(b + je32_to_cpu(n->offset), dlen);
break;

case JFFS2_COMPR_RTIME:
jffs2_rtime_decompress((unsigned char *) ((char *) n) + sizeof(struct jffs2_raw_inode),
(unsigned char *) (b + je32_to_cpu(n->offset)),
je32_to_cpu(n->csize), je32_to_cpu(n->dsize));
break;

/* [DYN]RUBIN support required! */

default:
Expand Down