ref: 6d76ea1fa1c03836c1f1caedbc37c78a5aaa214a
parent: e74f20021a4e51323d1c0f9356e9ff2a8030139c
author: Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com>
date: Sat Apr 10 12:41:26 EDT 2021
RunLengthDecode
--- a/f_runlength.c
+++ b/f_runlength.c
@@ -2,11 +2,43 @@
#include <libc.h>
#include "pdf.h"
+/* 7.4.5 RunLengthDecode filter */
+
static int
flreadall(void *aux, Buffer *bi, Buffer *bo)
{+ int sz, i;
+ uchar *p;
+
USED(aux);
- bufput(bo, bi->b, bi->sz);
+
+ p = bufdata(bi, &sz);
+ for(; sz > 0;){+ i = *p++;
+ sz--;
+
+ if(i == 0x80) /* EOD */
+ break;
+ if(i > 0x80){+ if(sz < 1){+ werrstr("no byte to repeat");+ return -1;
+ }
+ for(i = 257 - i; i > 0; i--)
+ bufput(bo, p, 1);
+ }else{+ i++;
+ if(i > sz){+ werrstr("short data");+ return -1;
+ }
+ bufput(bo, p, i);
+ p += i;
+ sz -= i;
+ }
+ }
+ bi->off = bi->sz;
+
return 0;
}