ref: 76bd9fac44e61eb25333f79206175db9485a3d9c
parent: 75ceb243faad4aa529afef047473ece203113eff
author: Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com>
date: Sat Nov 21 15:26:02 EST 2020
ascii85 filter
--- a/f_ascii85.c
+++ b/f_ascii85.c
@@ -2,6 +2,35 @@
#include <libc.h>
#include "pdf.h"
+static int
+flreadall(void *aux, Buffer *bi, Buffer *bo)
+{+ int i, j, insz;
+ uchar *in;
+ u32int x;
+
+ USED(aux);
+
+ in = bufdata(bi, &insz);
+ for(i = j = 0; i < insz; i++){+ if(!isws(in[i]))
+ in[j++] = in[i];
+ }
+ insz = j;
+ for(i = 0; i < insz; i += 5){+ for(x = 0, j = 0; j < 5; j++)
+ x = x*85 + ((i+j < insz ? in[i+j] : 'u') - 33);
+ bufput(bo, (uchar*)&x+3, 1);
+ bufput(bo, (uchar*)&x+2, 1);
+ bufput(bo, (uchar*)&x+1, 1);
+ bufput(bo, (uchar*)&x+0, 1);
+ }
+ in = bufdata(bo, &insz);
+
+ return 0;
+}
+
Filter filterASCII85 = {.name = "ASCII85Decode",
+ .readall = flreadall,
};