+++ /dev/null
-/* -*-c-*-
- *
- * Hexadecimal encoding and decoding.
- *
- * (c) 2001 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of the mLib utilities library.
- *
- * mLib is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * mLib is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with mLib; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "dstr.h"
-#include "hex.h"
-
-/*----- Important tables --------------------------------------------------*/
-
-static const char encodemap[] = { "0123456789abcdef" };
-
-static const signed char decodemap[] = {
- -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x */
- -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 1x */
- -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 2x */
- 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, -1, -1, -1, -1, -1, /* 3x */
- -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 4x */
- -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 5x */
- -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 6x */
- -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 7x */
- };
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @hex_encode@ --- *
- *
- * Arguments: @hex_ctx *ctx@ = pointer to a context block
- * @const void *p@ = pointer to a source buffer
- * @size_t sz@ = size of the source buffer
- * @dstr *d@ = pointer to destination string
- *
- * Returns: ---
- *
- * Use: Encodes a binary string in hex.
- */
-
-void hex_encode(hex_ctx *ctx, const void *p, size_t sz, dstr *d)
-{
- if (p) {
- const unsigned char *src = p;
-
- while (sz) {
- unsigned x = *src++;
- sz--;
- DPUTC(d, encodemap[(x >> 4) & 0xf]);
- DPUTC(d, encodemap[(x >> 0) & 0xf]);
- ctx->lnlen += 2;
- if (ctx->maxline && ctx->lnlen >= ctx->maxline) {
- dstr_puts(d, ctx->indent);
- ctx->lnlen = 0;
- }
- }
- }
-}
-
-/* --- @hex_decode@ --- *
- *
- * Arguments: @hex_ctx *ctx@ = pointer to a context block
- * @const void *p@ = pointer to a source buffer
- * @size_t sz@ = size of the source buffer
- * @dstr *d@ = pointer to destination string
- *
- * Returns: ---
- *
- * Use: Decodes a binary string in hex. Pass in a null source
- * pointer when you thing you've finished.
- */
-
-void hex_decode(hex_ctx *ctx, const void *p, size_t sz, dstr *d)
-{
- if (p) {
- unsigned long acc = ctx->acc;
- unsigned qsz = ctx->qsz;
- const char *src = p;
- int ch;
-
- while (sz) {
-
- /* --- Get the next character and convert it --- */
-
- ch = *src++;
- if (ch >= 128 || ch < 0)
- ch = -1;
- else
- ch = decodemap[ch];
- sz--;
- if (ch == -1)
- continue;
-
- /* --- Bung it in the accumulator --- */
-
- acc = (acc << 4) | ch;
- qsz++;
-
- /* --- Maybe write out a completed triplet --- */
-
- if (qsz == 2) {
- DPUTC(d, acc & 0xff);
- acc = 0;
- qsz = 0;
- }
- }
-
- ctx->acc = acc;
- ctx->qsz = qsz;
- } else {
- if (ctx->qsz)
- DPUTC(d, ctx->acc << 4);
- }
-}
-
-/* --- @hex_init@ --- *
- *
- * Arguments: @hex_ctx *ctx@ = pointer to context block to initialize
- *
- * Returns: ---
- *
- * Use: Initializes a hex context properly.
- */
-
-void hex_init(hex_ctx *ctx)
-{
- ctx->acc = 0;
- ctx->qsz = 0;
- ctx->lnlen = 0;
- ctx->indent = "\n";
- ctx->maxline = 72;
-}
-
-/*----- Test driver code --------------------------------------------------*/
-
-#ifdef TEST_RIG
-
-int main(int argc, char *argv[])
-{
- unsigned char buf[BUFSIZ];
- dstr d = DSTR_INIT;
- hex_ctx ctx;
- void (*proc)(hex_ctx *, const void *, size_t, dstr *);
- size_t sz;
-
- hex_init(&ctx);
-
- if (argc > 1 && strcmp(argv[1], "-d") == 0)
- proc = hex_decode;
- else {
- proc = hex_encode;
- putchar('\t');
- ctx.indent = "\n\t";
- ctx.maxline = 64;
- }
-
- do {
- sz = fread(buf, 1, sizeof(buf), stdin);
- if (sz) {
- proc(&ctx, buf, sz, &d);
- dstr_write(&d, stdout);
- dstr_destroy(&d);
- }
- } while (sz == sizeof(buf));
-
- proc(&ctx, 0, 0, &d);
- dstr_write(&d, stdout);
-
- if (proc == hex_encode)
- putchar('\n');
-
- return (0);
-}
-
-#endif
-
-/*----- That's all, folks -------------------------------------------------*/
~mdw / mLib / blobdiff