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Diffstat (limited to 'src/global/xtext.c')
| -rw-r--r-- | src/global/xtext.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/global/xtext.c b/src/global/xtext.c new file mode 100644 index 0000000..e0d3ed5 --- /dev/null +++ b/src/global/xtext.c @@ -0,0 +1,196 @@ +/*++ +/* 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 |