quoted unprintable

textcode/fmt_quotedprintable.c

@@ -0,0 +1,25 @@
+#include "fmt.h"
+#include "textcode.h"
+#include "haveinline.h"
+
+static inline int tohex(char c) {
+  return c>9?c-10+'A':c+'0';
+}
+
+unsigned int fmt_quotedprintable(char* dest,const char* src,unsigned int len) {
+  register const unsigned char* s=(const unsigned char*) src;
+  unsigned long written=0,i;
+  for (i=0; i<len; ++i) {
+    if (s[i]&0x80 || s[i]=='=') {
+      if (dest) {
+	dest[written]='=';
+	dest[written+1]=tohex(s[i]>>4);
+	dest[written+2]=tohex(s[i]&15);
+      }
+      written+=3;
+    } else {
+      if (dest) dest[written]=s[i]; ++written;
+    }
+  }
+  return written;
+}

textcode/scan_quotedprintable.c

@@ -0,0 +1,31 @@
+#include "fmt.h"
+#include "textcode.h"
+#include "haveinline.h"
+
+static inline int fromhex(char c) {
+  if (c>='0' && c<='9') return c-'0';
+  if (c>='A' && c<='F') return c-'A'+10;
+  if (c>='a' && c<='f') return c-'a'+10;
+  return -1;
+}
+
+unsigned int scan_quotedprintable(const char *src,char *dest,unsigned int *destlen) {
+  register const unsigned char* s=(const unsigned char*) src;
+  unsigned long written=0,i;
+  for (i=0; s[i]; ++i) {
+    if (s[i]=='=') {
+      int j=fromhex(s[i+1]);
+      if (j<0) break;
+      dest[written]=j<<4;
+      j=fromhex(s[i+2]);
+      if (j<0) break;
+      dest[written]|=j;
+      i+=2;
+    } else {
+      dest[written]=s[i];
+    }
+    ++written;
+  }
+  *destlen=written;
+  return i;
+}