btoa.c

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "plgetopt.h"
#include "secutil.h"
#include "nssb64.h"
#include <errno.h>

#if defined(XP_WIN) || (defined(__sun) && !defined(SVR4))
#if !defined(WIN32)
extern int fread(char *, size_t, size_t, FILE *);
extern int fwrite(char *, size_t, size_t, FILE *);
extern int fprintf(FILE *, char *, ...);
#endif
#endif

#if defined(WIN32)
#include "fcntl.h"
#include "io.h"
#endif

static PRInt32
output_ascii(void *arg, const char *obuf, PRInt32 size)
{
    FILE *outFile = arg;
    int nb;

    nb = fwrite(obuf, 1, size, outFile);
    if (nb != size) {
        PORT_SetError(SEC_ERROR_IO);
        return -1;
    }

    return nb;
}

static SECStatus
encode_file(FILE *outFile, FILE *inFile)
{
    NSSBase64Encoder *cx;
    int nb;
    SECStatus status = SECFailure;
    unsigned char ibuf[4096];

    cx = NSSBase64Encoder_Create(output_ascii, outFile);
    if (!cx) {
        return -1;
    }

    for (;;) {
        if (feof(inFile))
            break;
        nb = fread(ibuf, 1, sizeof(ibuf), inFile);
        if (nb != sizeof(ibuf)) {
            if (nb == 0) {
                if (ferror(inFile)) {
                    PORT_SetError(SEC_ERROR_IO);
                    goto loser;
                }
                /* eof */
                break;
            }
        }

        status = NSSBase64Encoder_Update(cx, ibuf, nb);
        if (status != SECSuccess)
            goto loser;
    }

    status = NSSBase64Encoder_Destroy(cx, PR_FALSE);
    if (status != SECSuccess)
        return status;

    /*
     * Add a trailing CRLF.  Note this must be done *after* the call
     * to Destroy above (because only then are we sure all data has
     * been written out).
     */
    fwrite("\r\n", 1, 2, outFile);
    return SECSuccess;

loser:
    (void)NSSBase64Encoder_Destroy(cx, PR_TRUE);
    return status;
}

static void
Usage(char *progName)
{
    fprintf(stderr,
            "Usage: %s [-i input] [-o output]\n",
            progName);
    fprintf(stderr, "%-20s Define an input file to use (default is stdin)\n",
            "-i input");
    fprintf(stderr, "%-20s Define an output file to use (default is stdout)\n",
            "-o output");
    fprintf(stderr, "%-20s Wrap output in BEGIN/END lines and the given suffix\n",
            "-w suffix");
    fprintf(stderr, "%-20s (use \"c\" as a shortcut for suffix CERTIFICATE)\n",
            "");
    exit(-1);
}

int
main(int argc, char **argv)
{
    char *progName;
    SECStatus rv;
    FILE *inFile, *outFile;
    PLOptState *optstate;
    PLOptStatus status;
    char *suffix = NULL;

    inFile = 0;
    outFile = 0;
    progName = strrchr(argv[0], '/');
    if (!progName)
        progName = strrchr(argv[0], '\\');
    progName = progName ? progName + 1 : argv[0];

    /* Parse command line arguments */
    optstate = PL_CreateOptState(argc, argv, "i:o:w:");
    while ((status = PL_GetNextOpt(optstate)) == PL_OPT_OK) {
        switch (optstate->option) {
            default:
                Usage(progName);
                break;

            case 'i':
                inFile = fopen(optstate->value, "rb");
                if (!inFile) {
                    fprintf(stderr, "%s: unable to open \"%s\" for reading\n",
                            progName, optstate->value);
                    return -1;
                }
                break;

            case 'o':
                outFile = fopen(optstate->value, "wb");
                if (!outFile) {
                    fprintf(stderr, "%s: unable to open \"%s\" for writing\n",
                            progName, optstate->value);
                    return -1;
                }
                break;

            case 'w':
                if (!strcmp(optstate->value, "c"))
                    suffix = strdup("CERTIFICATE");
                else
                    suffix = strdup(optstate->value);
                break;
        }
    }
    if (status == PL_OPT_BAD)
        Usage(progName);
    if (!inFile) {
#if defined(WIN32)
        /* If we're going to read binary data from stdin, we must put stdin
        ** into O_BINARY mode or else incoming \r\n's will become \n's.
        */

        int smrv = _setmode(_fileno(stdin), _O_BINARY);
        if (smrv == -1) {
            fprintf(stderr,
                    "%s: Cannot change stdin to binary mode. Use -i option instead.\n",
                    progName);
            return smrv;
        }
#endif
        inFile = stdin;
    }
    if (!outFile) {
#if defined(WIN32)
        /* We're going to write binary data to stdout. We must put stdout
        ** into O_BINARY mode or else outgoing \r\n's will become \r\r\n's.
        */

        int smrv = _setmode(_fileno(stdout), _O_BINARY);
        if (smrv == -1) {
            fprintf(stderr,
                    "%s: Cannot change stdout to binary mode. Use -o option instead.\n",
                    progName);
            return smrv;
        }
#endif
        outFile = stdout;
    }
    if (suffix) {
        fprintf(outFile, "-----BEGIN %s-----\n", suffix);
    }
    rv = encode_file(outFile, inFile);
    if (rv != SECSuccess) {
        fprintf(stderr, "%s: lossage: error=%d errno=%d\n",
                progName, PORT_GetError(), errno);
        return -1;
    }
    if (suffix) {
        fprintf(outFile, "-----END %s-----\n", suffix);
    }
    return 0;
}