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Diffstat (limited to 'libical/src/libical/base64.c')
-rw-r--r-- | libical/src/libical/base64.c | 323 |
1 files changed, 0 insertions, 323 deletions
diff --git a/libical/src/libical/base64.c b/libical/src/libical/base64.c deleted file mode 100644 index 5925f977ac..0000000000 --- a/libical/src/libical/base64.c +++ /dev/null @@ -1,323 +0,0 @@ -/* - - Encode or decode file as MIME base64 (RFC 1341) - - by John Walker - http://www.fourmilab.ch/ - - This program is in the public domain. - -*/ - -#define REVDATE "11th August 1997" - -#include <stdio.h> -#include <stdlib.h> -#include <ctype.h> -#include <string.h> - -#define TRUE 1 -#define FALSE 0 - -#define LINELEN 72 /* Encoded line length (max 76) */ - -typedef unsigned char byte; /* Byte type */ - -static FILE *fi = stdin; /* Input file */ -static FILE *fo = stdout; /* Output file */ -static byte iobuf[256]; /* I/O buffer */ -static int iolen = 0; /* Bytes left in I/O buffer */ -static int iocp = 256; /* Character removal pointer */ -static int ateof = FALSE; /* EOF encountered */ -static byte dtable[256]; /* Encode / decode table */ -static int linelength = 0; /* Length of encoded output line */ -static char eol[] = "\r\n"; /* End of line sequence */ -static int errcheck = TRUE; /* Check decode input for errors ? */ - -/* INBUF -- Fill input buffer with data */ - -static int inbuf(void) -{ - int l; - - if (ateof) { - return FALSE; - } - l = fread(iobuf, 1, 256, fi); /* Read input buffer */ - if (l <= 0) { - if (ferror(fi)) { - exit(1); - } - ateof = TRUE; - return FALSE; - } - iolen = l; - iocp = 0; - return TRUE; -} - -/* INCHAR -- Return next character from input */ - -static int inchar(void) -{ - if (iocp >= iolen) { - if (!inbuf()) { - return EOF; - } - } - - return iobuf[iocp++]; -} - -/* OCHAR -- Output an encoded character, inserting line breaks - where required. */ - -static void ochar(int c) -{ - if (linelength >= LINELEN) { - if (fputs(eol, fo) == EOF) { - exit(1); - } - linelength = 0; - } - if (putc(((byte) c), fo) == EOF) { - exit(1); - } - linelength++; -} - -/* ENCODE -- Encode binary file into base64. */ - -static void encode(void) -{ - int i, hiteof = FALSE; - - /* Fill dtable with character encodings. */ - - for (i = 0; i < 26; i++) { - dtable[i] = 'A' + i; - dtable[26 + i] = 'a' + i; - } - for (i = 0; i < 10; i++) { - dtable[52 + i] = '0' + i; - } - dtable[62] = '+'; - dtable[63] = '/'; - - while (!hiteof) { - byte igroup[3], ogroup[4]; - int c, n; - - igroup[0] = igroup[1] = igroup[2] = 0; - for (n = 0; n < 3; n++) { - c = inchar(); - if (c == EOF) { - hiteof = TRUE; - break; - } - igroup[n] = (byte) c; - } - if (n > 0) { - ogroup[0] = dtable[igroup[0] >> 2]; - ogroup[1] = dtable[((igroup[0] & 3) << 4) | (igroup[1] >> 4)]; - ogroup[2] = dtable[((igroup[1] & 0xF) << 2) | (igroup[2] >> 6)]; - ogroup[3] = dtable[igroup[2] & 0x3F]; - - /* Replace characters in output stream with "=" pad - characters if fewer than three characters were - read from the end of the input stream. */ - - if (n < 3) { - ogroup[3] = '='; - if (n < 2) { - ogroup[2] = '='; - } - } - for (i = 0; i < 4; i++) { - ochar(ogroup[i]); - } - } - } - if (fputs(eol, fo) == EOF) { - exit(1); - } -} - -/* INSIG -- Return next significant input */ - -static int insig(void) -{ - int c; - - /*CONSTANTCONDITION*/ - while (TRUE) { - c = inchar(); - if (c == EOF || (c > ' ')) { - return c; - } - } - /*NOTREACHED*/ -} - -/* DECODE -- Decode base64. */ - -static void decode(void) -{ - int i; - - for (i = 0; i < 255; i++) { - dtable[i] = 0x80; - } - for (i = 'A'; i <= 'Z'; i++) { - dtable[i] = 0 + (i - 'A'); - } - for (i = 'a'; i <= 'z'; i++) { - dtable[i] = 26 + (i - 'a'); - } - for (i = '0'; i <= '9'; i++) { - dtable[i] = 52 + (i - '0'); - } - dtable['+'] = 62; - dtable['/'] = 63; - dtable['='] = 0; - - /*CONSTANTCONDITION*/ - while (TRUE) { - byte a[4], b[4], o[3]; - - for (i = 0; i < 4; i++) { - int c = insig(); - - if (c == EOF) { - if (errcheck && (i > 0)) { - fprintf(stderr, "Input file incomplete.\n"); - exit(1); - } - return; - } - if (dtable[c] & 0x80) { - if (errcheck) { - fprintf(stderr, "Illegal character '%c' in input file.\n", c); - exit(1); - } - /* Ignoring errors: discard invalid character. */ - i--; - continue; - } - a[i] = (byte) c; - b[i] = (byte) dtable[c]; - } - o[0] = (b[0] << 2) | (b[1] >> 4); - o[1] = (b[1] << 4) | (b[2] >> 2); - o[2] = (b[2] << 6) | b[3]; - i = a[2] == '=' ? 1 : (a[3] == '=' ? 2 : 3); - if (fwrite(o, i, 1, fo) == EOF) { - exit(1); - } - if (i < 3) { - return; - } - } -} - -/* USAGE -- Print how-to-call information. */ - -static void usage(char *pname) -{ - fprintf(stderr, "%s -- Encode/decode file as base64. Call:\n", pname); - fprintf(stderr, - " %s [-e[ncode] / -d[ecode]] [-n] [infile] [outfile]\n", pname); - fprintf(stderr, "\n"); - fprintf(stderr, "Options:\n"); - fprintf(stderr, " -D Decode base64 encoded file\n"); - fprintf(stderr, " -E Encode file into base64\n"); - fprintf(stderr, " -N Ignore errors when decoding\n"); - fprintf(stderr, " -U Print this message\n"); - fprintf(stderr, "\n"); - fprintf(stderr, "by John Walker\n"); - fprintf(stderr, " WWW: http://www.fourmilab.ch/\n"); -} - -/* Main program */ - -int main(int argc, char *argv[]) -{ - int i, f = 0, decoding = FALSE; - char *cp, opt; - - for (i = 1; i < argc; i++) { - cp = argv[i]; - if (*cp == '-') { - opt = *(++cp); - if (islower(opt)) { - opt = toupper(opt); - } - switch (opt) { - - case 'D': /* -D Decode */ - decoding = TRUE; - break; - - case 'E': /* -E Encode */ - decoding = FALSE; - break; - - case 'N': /* -N Suppress error checking */ - errcheck = FALSE; - break; - - case 'U': /* -U Print how-to-call information */ - case '?': - usage(argv[0]); - return 0; - } - } else { - switch (f) { - - /** Warning! On systems which distinguish text mode and - binary I/O (MS-DOS, Macintosh, etc.) the modes in these - open statements will have to be made conditional based - upon whether an encode or decode is being done, which - will have to be specified earlier. But it's worse: if - input or output is from standard input or output, the - mode will have to be changed on the fly, which is - generally system and compiler dependent. 'Twasn't me - who couldn't conform to Unix CR/LF convention, so - don't ask me to write the code to work around - Apple and Microsoft's incompatible standards. **/ - - case 0: - if (strcmp(cp, "-") != 0) { - if ((fi = fopen(cp, "r")) == NULL) { - fprintf(stderr, "Cannot open input file %s\n", cp); - return 2; - } - } - f++; - break; - - case 1: - if (strcmp(cp, "-") != 0) { - if ((fo = fopen(cp, "w")) == NULL) { - fprintf(stderr, "Cannot open output file %s\n", cp); - return 2; - } - } - f++; - break; - - default: - fprintf(stderr, "Too many file names specified.\n"); - usage(argv[0]); - return 2; - } - } - } - - if (decoding) { - decode(); - } else { - encode(); - } - return 0; -} |