From b7c15c31519dc44c1f691e0466badd556ffe9423 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:18:56 +0200 Subject: Adding upstream version 3.7.10. Signed-off-by: Daniel Baumann --- src/util/hex_quote.c | 153 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) create mode 100644 src/util/hex_quote.c (limited to 'src/util/hex_quote.c') diff --git a/src/util/hex_quote.c b/src/util/hex_quote.c new file mode 100644 index 0000000..7089385 --- /dev/null +++ b/src/util/hex_quote.c @@ -0,0 +1,153 @@ +/*++ +/* NAME +/* hex_quote 3 +/* SUMMARY +/* quote/unquote text, HTTP style. +/* SYNOPSIS +/* #include +/* +/* VSTRING *hex_quote(hex, raw) +/* VSTRING *hex; +/* const char *raw; +/* +/* VSTRING *hex_unquote(raw, hex) +/* VSTRING *raw; +/* const char *hex; +/* DESCRIPTION +/* hex_quote() takes a null-terminated string and replaces non-printable +/* and whitespace characters and the % by %XX, XX being the two-digit +/* hexadecimal equivalent. +/* The hexadecimal codes are produced as upper-case characters. The result +/* value is the hex argument. +/* +/* hex_unquote() performs the opposite transformation. This function +/* understands lowercase, uppercase, and mixed case %XX sequences. The +/* result value is the raw argument in case of success, a null pointer +/* otherwise. +/* BUGS +/* hex_quote() 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 + +/* Utility library. */ + +#include "msg.h" +#include "vstring.h" +#include "hex_quote.h" + +/* Application-specific. */ + +#define STR(x) vstring_str(x) +#define LEN(x) VSTRING_LEN(x) + +/* hex_quote - raw data to quoted */ + +VSTRING *hex_quote(VSTRING *hex, const char *raw) +{ + const char *cp; + int ch; + + VSTRING_RESET(hex); + for (cp = raw; (ch = *(unsigned const char *) cp) != 0; cp++) { + if (ch != '%' && !ISSPACE(ch) && ISPRINT(ch)) { + VSTRING_ADDCH(hex, ch); + } else { + vstring_sprintf_append(hex, "%%%02X", ch); + } + } + VSTRING_TERMINATE(hex); + return (hex); +} + +/* hex_unquote - quoted data to raw */ + +VSTRING *hex_unquote(VSTRING *raw, const char *hex) +{ + const char *cp; + int ch; + + VSTRING_RESET(raw); + for (cp = hex; (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(raw, ch); + } + VSTRING_TERMINATE(raw); + return (raw); +} + +#ifdef TEST + + /* + * Proof-of-concept test program: convert to hex and back. + */ +#include + +#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 *raw = vstring_alloc(BUFLEN); + VSTRING *hex = vstring_alloc(100); + ssize_t len; + + while ((len = read_buf(VSTREAM_IN, raw)) > 0) { + hex_quote(hex, STR(raw)); + if (hex_unquote(raw, STR(hex)) == 0) + msg_fatal("bad input: %.100s", STR(hex)); + if (LEN(raw) != len) + msg_fatal("len %ld != raw len %ld", (long) len, (long) LEN(raw)); + if (vstream_fwrite(VSTREAM_OUT, STR(raw), LEN(raw)) != LEN(raw)) + msg_fatal("write error: %m"); + } + vstream_fflush(VSTREAM_OUT); + vstring_free(raw); + vstring_free(hex); + return (0); +} + +#endif -- cgit v1.2.3