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Original commit message from CVS: Remove threadsafe properties. Fix elements because GObject complains when installing a property before declaring a set/get_property handler. Rearrange gstelement.h file, use STATE macros for state locks. Free mutexes in the finalize method instead of dispose.
497 lines
15 KiB
C
497 lines
15 KiB
C
/* GStreamer
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* Copyright (C) 2002 Erik Walthinsen <omega@cse.ogi.edu>
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* 2002 Wim Taymans <wim.taymans@chello.be>
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*
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* gstmd5sink.c: A sink computing an md5 checksum from a stream
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*
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* The md5 code was taken from glibc-2.2.3/crypt/md5.c and slightly
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* modified.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <string.h>
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/gst.h>
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#include "gstmd5sink.h"
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GST_DEBUG_CATEGORY_STATIC (gst_md5sink_debug);
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#define GST_CAT_DEFAULT gst_md5sink_debug
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GstElementDetails gst_md5sink_details = GST_ELEMENT_DETAILS ("MD5 Sink",
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"Sink",
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"compute MD5 for incoming data",
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"Benjamin Otte <in7y118@public.uni-hamburg.de>");
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/* MD5Sink signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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ARG_MD5
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/* FILL ME */
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};
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GstStaticPadTemplate md5_sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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#define _do_init(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_md5sink_debug, "md5sink", 0, "md5sink element");
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GST_BOILERPLATE_FULL (GstMD5Sink, gst_md5sink, GstElement, GST_TYPE_ELEMENT,
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_do_init);
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/* GObject stuff */
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/*static void gst_md5sink_set_property (GObject *object, guint prop_id,
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const GValue *value, GParamSpec *pspec);*/
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static void gst_md5sink_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_md5sink_chain (GstPad * pad, GstData * _data);
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static GstElementStateReturn gst_md5sink_change_state (GstElement * element);
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/* MD5 stuff */
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static void md5_init_ctx (GstMD5Sink * ctx);
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static gpointer md5_read_ctx (GstMD5Sink * ctx, gpointer resbuf);
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static gpointer md5_finish_ctx (GstMD5Sink * ctx, gpointer resbuf);
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static void md5_process_bytes (const void *buffer, size_t len,
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GstMD5Sink * ctx);
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static void md5_process_block (const void *buffer, size_t len,
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GstMD5Sink * ctx);
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/* This array contains the bytes used to pad the buffer to the next
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64-byte boundary. (RFC 1321, 3.1: Step 1) */
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static const guchar fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
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/* MD5 functions */
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/* Initialize structure containing state of computation.
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(RFC 1321, 3.3: Step 3) */
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static void
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md5_init_ctx (GstMD5Sink * ctx)
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{
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ctx->A = 0x67452301;
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ctx->B = 0xefcdab89;
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ctx->C = 0x98badcfe;
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ctx->D = 0x10325476;
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ctx->total[0] = ctx->total[1] = 0;
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ctx->buflen = 0;
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}
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/* Process the remaining bytes in the internal buffer and the usual
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prolog according to the standard and write the result to RESBUF.
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IMPORTANT: On some systems it is required that RESBUF is correctly
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aligned for a 32 bits value. */
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static gpointer
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md5_finish_ctx (GstMD5Sink * ctx, gpointer resbuf)
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{
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/* Take yet unprocessed bytes into account. */
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guint32 bytes = ctx->buflen;
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size_t pad;
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/* Now count remaining bytes. */
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ctx->total[0] += bytes;
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if (ctx->total[0] < bytes)
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++ctx->total[1];
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pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
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memcpy (&ctx->buffer[bytes], fillbuf, pad);
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/* Put the 64-bit file length in *bits* at the end of the buffer. */
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*(guint32 *) & ctx->buffer[bytes + pad] = GUINT32_TO_LE (ctx->total[0] << 3);
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*(guint32 *) & ctx->buffer[bytes + pad + 4] =
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GUINT32_TO_LE ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
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/* Process last bytes. */
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md5_process_block (ctx->buffer, bytes + pad + 8, ctx);
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return md5_read_ctx (ctx, resbuf);
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}
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/* Put result from CTX in first 16 bytes following RESBUF. The result
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must be in little endian byte order.
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IMPORTANT: On some systems it is required that RESBUF is correctly
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aligned for a 32 bits value. */
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static gpointer
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md5_read_ctx (GstMD5Sink * ctx, gpointer resbuf)
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{
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((guint32 *) resbuf)[0] = GUINT32_TO_LE (ctx->A);
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((guint32 *) resbuf)[1] = GUINT32_TO_LE (ctx->B);
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((guint32 *) resbuf)[2] = GUINT32_TO_LE (ctx->C);
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((guint32 *) resbuf)[3] = GUINT32_TO_LE (ctx->D);
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return resbuf;
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}
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static void
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md5_process_bytes (const void *buffer, size_t len, GstMD5Sink * ctx)
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{
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/*const void aligned_buffer = buffer; */
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/* When we already have some bits in our internal buffer concatenate
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both inputs first. */
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if (ctx->buflen != 0) {
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size_t left_over = ctx->buflen;
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size_t add = 128 - left_over > len ? len : 128 - left_over;
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/* Only put full words in the buffer. */
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/* Forcing alignment here appears to be only an optimization.
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* The glibc source uses __alignof__, which seems to be a
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* gratuitous usage of a GCC extension, when sizeof() will
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* work fine. (And don't question the sanity of using
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* sizeof(guint32) instead of 4. */
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/* add -= add % __alignof__ (guint32); */
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add -= add % sizeof (guint32);
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memcpy (&ctx->buffer[left_over], buffer, add);
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ctx->buflen += add;
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if (ctx->buflen > 64) {
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md5_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
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ctx->buflen &= 63;
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/* The regions in the following copy operation cannot overlap. */
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memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63], ctx->buflen);
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}
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buffer = (const char *) buffer + add;
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len -= add;
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}
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/* Process available complete blocks. */
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if (len > 64) {
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md5_process_block (buffer, len & ~63, ctx);
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buffer = (const char *) buffer + (len & ~63);
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len &= 63;
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}
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/* Move remaining bytes in internal buffer. */
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if (len > 0) {
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size_t left_over = ctx->buflen;
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memcpy (&ctx->buffer[left_over], buffer, len);
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left_over += len;
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if (left_over >= 64) {
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md5_process_block (ctx->buffer, 64, ctx);
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left_over -= 64;
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memcpy (ctx->buffer, &ctx->buffer[64], left_over);
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}
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ctx->buflen = left_over;
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}
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}
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/* These are the four functions used in the four steps of the MD5 algorithm
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and defined in the RFC 1321. The first function is a little bit optimized
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(as found in Colin Plumbs public domain implementation). */
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/* #define FF(b, c, d) ((b & c) | (~b & d)) */
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#define FF(b, c, d) (d ^ (b & (c ^ d)))
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#define FG(b, c, d) FF (d, b, c)
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#define FH(b, c, d) (b ^ c ^ d)
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#define FI(b, c, d) (c ^ (b | ~d))
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/* Process LEN bytes of BUFFER, accumulating context into CTX.
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It is assumed that LEN % 64 == 0. */
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static void
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md5_process_block (const void *buffer, size_t len, GstMD5Sink * ctx)
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{
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guint32 correct_words[16];
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const guint32 *words = buffer;
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size_t nwords = len / sizeof (guint32);
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const guint32 *endp = words + nwords;
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guint32 A = ctx->A;
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guint32 B = ctx->B;
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guint32 C = ctx->C;
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guint32 D = ctx->D;
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/* First increment the byte count. RFC 1321 specifies the possible
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length of the file up to 2^64 bits. Here we only compute the
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number of bytes. Do a double word increment. */
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ctx->total[0] += len;
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if (ctx->total[0] < len)
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++ctx->total[1];
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/* Process all bytes in the buffer with 64 bytes in each round of
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the loop. */
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while (words < endp) {
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guint32 *cwp = correct_words;
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guint32 A_save = A;
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guint32 B_save = B;
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guint32 C_save = C;
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guint32 D_save = D;
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/* First round: using the given function, the context and a constant
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the next context is computed. Because the algorithms processing
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unit is a 32-bit word and it is determined to work on words in
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little endian byte order we perhaps have to change the byte order
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before the computation. To reduce the work for the next steps
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we store the swapped words in the array CORRECT_WORDS. */
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#define OP(a, b, c, d, s, T) \
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do \
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{ \
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a += FF (b, c, d) + (*cwp++ = GUINT32_TO_LE (*words)) + T; \
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++words; \
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CYCLIC (a, s); \
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a += b; \
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} \
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while (0)
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/* It is unfortunate that C does not provide an operator for
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cyclic rotation. Hope the C compiler is smart enough. */
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#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
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/* Before we start, one word to the strange constants.
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They are defined in RFC 1321 as
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T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
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*/
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/* Round 1. */
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OP (A, B, C, D, 7, 0xd76aa478);
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OP (D, A, B, C, 12, 0xe8c7b756);
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OP (C, D, A, B, 17, 0x242070db);
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OP (B, C, D, A, 22, 0xc1bdceee);
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OP (A, B, C, D, 7, 0xf57c0faf);
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OP (D, A, B, C, 12, 0x4787c62a);
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OP (C, D, A, B, 17, 0xa8304613);
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OP (B, C, D, A, 22, 0xfd469501);
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OP (A, B, C, D, 7, 0x698098d8);
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OP (D, A, B, C, 12, 0x8b44f7af);
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OP (C, D, A, B, 17, 0xffff5bb1);
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OP (B, C, D, A, 22, 0x895cd7be);
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OP (A, B, C, D, 7, 0x6b901122);
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OP (D, A, B, C, 12, 0xfd987193);
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OP (C, D, A, B, 17, 0xa679438e);
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OP (B, C, D, A, 22, 0x49b40821);
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/* For the second to fourth round we have the possibly swapped words
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in CORRECT_WORDS. Redefine the macro to take an additional first
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argument specifying the function to use. */
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#undef OP
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#define OP(f, a, b, c, d, k, s, T) \
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do \
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{ \
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a += f (b, c, d) + correct_words[k] + T; \
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CYCLIC (a, s); \
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a += b; \
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} \
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while (0)
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/* Round 2. */
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OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
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OP (FG, D, A, B, C, 6, 9, 0xc040b340);
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OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
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OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
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OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
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OP (FG, D, A, B, C, 10, 9, 0x02441453);
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OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
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OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
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OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
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OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
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OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
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OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
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OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
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OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
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OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
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OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
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/* Round 3. */
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OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
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OP (FH, D, A, B, C, 8, 11, 0x8771f681);
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OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
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OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
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OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
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OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
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OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
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OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
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OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
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OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
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OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
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OP (FH, B, C, D, A, 6, 23, 0x04881d05);
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OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
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OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
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OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
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OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
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/* Round 4. */
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OP (FI, A, B, C, D, 0, 6, 0xf4292244);
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OP (FI, D, A, B, C, 7, 10, 0x432aff97);
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OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
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OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
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OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
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OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
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OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
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OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
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OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
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OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
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OP (FI, C, D, A, B, 6, 15, 0xa3014314);
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OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
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OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
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OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
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OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
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OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
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/* Add the starting values of the context. */
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A += A_save;
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B += B_save;
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C += C_save;
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D += D_save;
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}
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/* Put checksum in context given as argument. */
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ctx->A = A;
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ctx->B = B;
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ctx->C = C;
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ctx->D = D;
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}
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static void
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gst_md5sink_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details (gstelement_class, &gst_md5sink_details);
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&md5_sink_template));
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}
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static void
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gst_md5sink_class_init (GstMD5SinkClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_md5sink_get_property);
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g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MD5,
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g_param_spec_string ("md5", "md5", "current value of the md5 sum",
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"", G_PARAM_READABLE));
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gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_md5sink_change_state);
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}
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static void
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gst_md5sink_init (GstMD5Sink * md5sink)
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{
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GstPad *pad;
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pad =
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gst_pad_new_from_template (gst_static_pad_template_get
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(&md5_sink_template), "sink");
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gst_element_add_pad (GST_ELEMENT (md5sink), pad);
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gst_pad_set_chain_function (pad, GST_DEBUG_FUNCPTR (gst_md5sink_chain));
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md5_init_ctx (md5sink);
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}
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static GstElementStateReturn
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gst_md5sink_change_state (GstElement * element)
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{
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GstMD5Sink *sink;
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/* element check */
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sink = GST_MD5SINK (element);
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g_return_val_if_fail (GST_IS_MD5SINK (sink), GST_STATE_FAILURE);
|
|
|
|
switch (GST_STATE_TRANSITION (element)) {
|
|
case GST_STATE_READY_TO_PAUSED:
|
|
md5_init_ctx (sink);
|
|
g_object_notify (G_OBJECT (element), "md5");
|
|
break;
|
|
case GST_STATE_PAUSED_TO_READY:
|
|
md5_finish_ctx (sink, sink->md5);
|
|
g_object_notify (G_OBJECT (element), "md5");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if ((GST_ELEMENT_CLASS (parent_class)->change_state))
|
|
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
|
|
|
|
return GST_STATE_SUCCESS;
|
|
}
|
|
|
|
static void
|
|
gst_md5sink_get_property (GObject * object, guint prop_id, GValue * value,
|
|
GParamSpec * pspec)
|
|
{
|
|
GstMD5Sink *sink;
|
|
|
|
/* it's not null if we got it, but it might not be ours */
|
|
g_return_if_fail (GST_IS_MD5SINK (object));
|
|
|
|
sink = GST_MD5SINK (object);
|
|
|
|
switch (prop_id) {
|
|
case ARG_MD5:
|
|
{
|
|
/* you could actually get a value for the current md5.
|
|
* This is currently disabled.
|
|
* md5_read_ctx (sink, sink->md5); */
|
|
/* md5 is a guchar[16] */
|
|
int i;
|
|
guchar *md5string = g_malloc0 (33);
|
|
|
|
for (i = 0; i < 16; ++i)
|
|
sprintf (md5string + i * 2, "%02x", sink->md5[i]);
|
|
g_value_set_string (value, md5string);
|
|
g_free (md5string);
|
|
}
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_md5sink_chain (GstPad * pad, GstData * _data)
|
|
{
|
|
GstBuffer *buf = GST_BUFFER (_data);
|
|
GstMD5Sink *md5sink;
|
|
|
|
g_return_if_fail (pad != NULL);
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (buf != NULL);
|
|
|
|
md5sink = GST_MD5SINK (gst_pad_get_parent (pad));
|
|
|
|
if (GST_IS_BUFFER (buf)) {
|
|
md5_process_bytes (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf), md5sink);
|
|
}
|
|
|
|
gst_buffer_unref (buf);
|
|
}
|