add textcode api for uuencode and uudecode, base64 and quoted printable.

textcode/fmt_uuencoded.c

@@ -0,0 +1,36 @@
+#include "fmt.h"
+#include "textcode.h"
+#include "haveinline.h"
+
+static inline unsigned int enc(unsigned char x) {
+  return ((x-1)&077)+'!';
+}
+
+unsigned int fmt_uuencoded(char* dest,const char* src,unsigned int len) {
+  unsigned int i;
+  register const unsigned char* s=(const unsigned char*) src;
+  const char* orig=dest;
+  unsigned long tmp;
+  while (len) {
+    {
+      register unsigned int diff;
+      if (len>45) { i=15; diff=45; } else { i=(len+2)/3; diff=len; }
+      if (orig) *dest=enc(diff); ++dest;
+      len-=diff;
+    }
+    for (; i; --i) {
+      tmp=((unsigned long)s[0] << 16) +
+	  ((unsigned long)s[1] << 8) +
+	  ((unsigned long)s[2]);
+      if (orig) {
+	dest[0]=enc((tmp>>(3*6))&077);
+	dest[1]=enc((tmp>>(2*6))&077);
+	dest[2]=enc((tmp>>(1*6))&077);
+	dest[3]=enc(tmp&077);
+      }
+      dest+=4; s+=3;
+    }
+    if (orig) *dest='\n'; ++dest;
+  }
+  return dest-orig;
+}

textcode/scan_uuencoded.c

@@ -0,0 +1,24 @@
+#include "textcode.h"
+#include "haveinline.h"
+
+unsigned int scan_uuencoded(const char *src,char *dest,unsigned int *destlen) {
+  unsigned int len;
+  unsigned long tmp;
+  register const unsigned char* s=(const unsigned char*) src;
+  const char* orig=dest;
+  if ((len=*s-' ')>64) return 0;
+  ++s;
+  while (len>0) {
+    if (s[0]-' '>64 || s[1]-' '>64 || s[2]-' '>64 || s[3]-' '>64) return 0;
+    tmp=(((s[0]-' ')&077) << (3*6)) +
+        (((s[1]-' ')&077) << (2*6)) +
+        (((s[2]-' ')&077) << (1*6)) +
+        (((s[3]-' ')&077));
+    s+=4;
+    if (len) { *dest=tmp>>16; ++dest; --len; }
+    if (len) { *dest=tmp>>8; ++dest; --len; }
+    if (len) { *dest=tmp&0xff; ++dest; --len; }
+  }
+  *destlen=dest-orig;
+  return (const char*)s-src;
+}