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-rw-r--r--src/global/xtext.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/src/global/xtext.c b/src/global/xtext.c
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+/*++
+/* NAME
+/* xtext 3
+/* SUMMARY
+/* quote/unquote text, xtext style.
+/* SYNOPSIS
+/* #include <xtext.h>
+/*
+/* VSTRING *xtext_quote(quoted, unquoted, special)
+/* VSTRING *quoted;
+/* const char *unquoted;
+/* const char *special;
+/*
+/* VSTRING *xtext_quote_append(unquoted, quoted, special)
+/* VSTRING *unquoted;
+/* const char *quoted;
+/* const char *special;
+/*
+/* VSTRING *xtext_unquote(unquoted, quoted)
+/* VSTRING *unquoted;
+/* const char *quoted;
+/*
+/* VSTRING *xtext_unquote_append(unquoted, quoted)
+/* VSTRING *unquoted;
+/* const char *quoted;
+/* DESCRIPTION
+/* xtext_quote() takes a null-terminated string and replaces characters
+/* +, <33(10) and >126(10), as well as characters specified with "special"
+/* by +XX, XX being the two-digit uppercase hexadecimal equivalent.
+/*
+/* xtext_quote_append() is like xtext_quote(), but appends the conversion
+/* result to the result buffer.
+/*
+/* xtext_unquote() performs the opposite transformation. This function
+/* understands lowercase, uppercase, and mixed case +XX sequences. The
+/* result value is the unquoted argument in case of success, a null pointer
+/* otherwise.
+/*
+/* xtext_unquote_append() is like xtext_unquote(), but appends
+/* the conversion result to the result buffer.
+/* BUGS
+/* This module cannot process null characters in data.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "vstring.h"
+#include "xtext.h"
+
+/* Application-specific. */
+
+#define STR(x) vstring_str(x)
+#define LEN(x) VSTRING_LEN(x)
+
+/* xtext_quote_append - append unquoted data to quoted data */
+
+VSTRING *xtext_quote_append(VSTRING *quoted, const char *unquoted,
+ const char *special)
+{
+ const char *cp;
+ int ch;
+
+ for (cp = unquoted; (ch = *(unsigned const char *) cp) != 0; cp++) {
+ if (ch != '+' && ch > 32 && ch < 127
+ && (*special == 0 || strchr(special, ch) == 0)) {
+ VSTRING_ADDCH(quoted, ch);
+ } else {
+ vstring_sprintf_append(quoted, "+%02X", ch);
+ }
+ }
+ VSTRING_TERMINATE(quoted);
+ return (quoted);
+}
+
+/* xtext_quote - unquoted data to quoted */
+
+VSTRING *xtext_quote(VSTRING *quoted, const char *unquoted, const char *special)
+{
+ VSTRING_RESET(quoted);
+ xtext_quote_append(quoted, unquoted, special);
+ return (quoted);
+}
+
+/* xtext_unquote_append - quoted data to unquoted */
+
+VSTRING *xtext_unquote_append(VSTRING *unquoted, const char *quoted)
+{
+ const unsigned char *cp;
+ int ch;
+
+ for (cp = (const unsigned char *) quoted; (ch = *cp) != 0; cp++) {
+ if (ch == '+') {
+ if (ISDIGIT(cp[1]))
+ ch = (cp[1] - '0') << 4;
+ else if (cp[1] >= 'a' && cp[1] <= 'f')
+ ch = (cp[1] - 'a' + 10) << 4;
+ else if (cp[1] >= 'A' && cp[1] <= 'F')
+ ch = (cp[1] - 'A' + 10) << 4;
+ else
+ return (0);
+ if (ISDIGIT(cp[2]))
+ ch |= (cp[2] - '0');
+ else if (cp[2] >= 'a' && cp[2] <= 'f')
+ ch |= (cp[2] - 'a' + 10);
+ else if (cp[2] >= 'A' && cp[2] <= 'F')
+ ch |= (cp[2] - 'A' + 10);
+ else
+ return (0);
+ cp += 2;
+ }
+ VSTRING_ADDCH(unquoted, ch);
+ }
+ VSTRING_TERMINATE(unquoted);
+ return (unquoted);
+}
+/* xtext_unquote - quoted data to unquoted */
+
+VSTRING *xtext_unquote(VSTRING *unquoted, const char *quoted)
+{
+ VSTRING_RESET(unquoted);
+ return (xtext_unquote_append(unquoted, quoted) ? unquoted : 0);
+}
+
+#ifdef TEST
+
+ /*
+ * Proof-of-concept test program: convert to quoted and back.
+ */
+#include <vstream.h>
+
+#define BUFLEN 1024
+
+static ssize_t read_buf(VSTREAM *fp, VSTRING *buf)
+{
+ ssize_t len;
+
+ len = vstream_fread_buf(fp, buf, BUFLEN);
+ VSTRING_TERMINATE(buf);
+ return (len);
+}
+
+int main(int unused_argc, char **unused_argv)
+{
+ VSTRING *unquoted = vstring_alloc(BUFLEN);
+ VSTRING *quoted = vstring_alloc(100);
+ ssize_t len;
+
+ /*
+ * Negative tests.
+ */
+ if (xtext_unquote(unquoted, "++1") != 0)
+ msg_warn("undetected error pattern 1");
+ if (xtext_unquote(unquoted, "+2+") != 0)
+ msg_warn("undetected error pattern 2");
+
+ /*
+ * Positive tests.
+ */
+ while ((len = read_buf(VSTREAM_IN, unquoted)) > 0) {
+ xtext_quote(quoted, STR(unquoted), "+=");
+ if (xtext_unquote(unquoted, STR(quoted)) == 0)
+ msg_fatal("bad input: %.100s", STR(quoted));
+ if (LEN(unquoted) != len)
+ msg_fatal("len %ld != unquoted len %ld",
+ (long) len, (long) LEN(unquoted));
+ if (vstream_fwrite(VSTREAM_OUT, STR(unquoted), LEN(unquoted)) != LEN(unquoted))
+ msg_fatal("write error: %m");
+ }
+ vstream_fflush(VSTREAM_OUT);
+ vstring_free(unquoted);
+ vstring_free(quoted);
+ return (0);
+}
+
+#endif