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ascii85: support z, validate each character, do NOT change the input buffer

--- a/f_ascii85.c

+++ b/f_ascii85.c

@@ -14,14 +14,24 @@

 	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);

+	for(i = 0; i < insz;){

+		if(isws(in[i])){

+			i++;

+			continue;

+		}

+

+		if(in[i] == 'z'){

+			x = 0;

+			i++;

+		}else{

+			for(x = 0, j = 0; j < 5; j++, i++){

+				if(in[i] < '!' || in[i] > 'u'){

+					werrstr("invalid ascii85 char 0x%02x", in[i]);

+					return -1;

+				}

+				x = x*85 + ((i < insz ? in[i] : 'u') - '!');

+			}

+		}

 		c[0] = x >> 24;

 		c[1] = x >> 16;

 		c[2] = x >> 8;