diff decoders/libmpg123/stringbuf.c @ 562:7e08477b0fc1

MP3 decoder upgrade work. Ripped out SMPEG and mpglib support, replaced it with "mpg123.c" and libmpg123. libmpg123 is a much better version of mpglib, so it should solve all the problems about MP3's not seeking, or most modern MP3's not playing at all, etc. Since you no longer have to make a tradeoff with SMPEG for features, and SMPEG is basically rotting, I removed it from the project. There is still work to be done with libmpg123...there are MMX, 3DNow, SSE, Altivec, etc decoders which we don't have enabled at the moment, and the build system could use some work to make this compile more cleanly, etc. Still: huge win.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 30 Jan 2009 02:44:47 -0500
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/decoders/libmpg123/stringbuf.c	Fri Jan 30 02:44:47 2009 -0500
@@ -0,0 +1,131 @@
+/*
+	stringbuf: mimicking a bit of C++ to more safely handle strings
+
+	copyright 2006-8 by the mpg123 project - free software under the terms of the LGPL 2.1
+	see COPYING and AUTHORS files in distribution or http://mpg123.org
+	initially written by Thomas Orgis
+*/
+
+#include "mpg123lib_intern.h"
+#include "config.h"
+#include "mpg123.h"
+#include "compat.h"
+#include <string.h>
+#include "debug.h"
+
+void attribute_align_arg mpg123_init_string(mpg123_string* sb)
+{
+	sb->p = NULL;
+	sb->size = 0;
+	sb->fill = 0;
+}
+
+void attribute_align_arg mpg123_free_string(mpg123_string* sb)
+{
+	if(sb->p != NULL) free(sb->p);
+	mpg123_init_string(sb);
+}
+
+int attribute_align_arg mpg123_grow_string(mpg123_string* sb, size_t new)
+{
+	if(sb->size < new) return mpg123_resize_string(sb, new);
+	else return 1;
+}
+
+int attribute_align_arg mpg123_resize_string(mpg123_string* sb, size_t new)
+{
+	debug3("resizing string pointer %p from %lu to %lu", (void*) sb->p, (unsigned long)sb->size, (unsigned long)new);
+	if(new == 0)
+	{
+		if(sb->size && sb->p != NULL) free(sb->p);
+		mpg123_init_string(sb);
+		return 1;
+	}
+	if(sb->size != new)
+	{
+		char* t;
+		debug("really!");
+		t = (char*) safe_realloc(sb->p, new*sizeof(char));
+		debug1("safe_realloc returned %p", (void*) t); 
+		if(t != NULL)
+		{
+			sb->p = t;
+			sb->size = new;
+			return 1;
+		}
+		else return 0;
+	}
+	else return 1; /* success */
+}
+
+int attribute_align_arg mpg123_copy_string(mpg123_string* from, mpg123_string* to)
+{
+	size_t fill;
+	char  *text;
+	if(to == NULL) return -1;
+
+	debug2("called copy_string with %p -> %p", (void*)from, (void*)to);
+	if(from == NULL)
+	{
+		fill = 0;
+		text = NULL;
+	}
+	else
+	{
+		fill = from->fill;
+		text = from->p;
+	}
+
+	if(mpg123_resize_string(to, fill))
+	{
+		memcpy(to->p, text, fill);
+		to->fill = fill;
+		return 1;
+	}
+	else return 0;
+}
+
+int attribute_align_arg mpg123_add_string(mpg123_string* sb, const char* stuff)
+{
+	debug1("adding %s", stuff);
+	return mpg123_add_substring(sb, stuff, 0, strlen(stuff));
+}
+
+int attribute_align_arg mpg123_add_substring(mpg123_string *sb, const char *stuff, size_t from, size_t count)
+{
+	debug("adding a substring");
+	if(sb->fill) /* includes zero byte... */
+	{
+		if( (SIZE_MAX - sb->fill >= count) /* Avoid overflow. */
+		    && (sb->size >= sb->fill+count || mpg123_grow_string(sb, sb->fill+count)) )
+		{
+			memcpy(sb->p+sb->fill-1, stuff+from, count);
+			sb->fill += count;
+			sb->p[sb->fill-1] = 0; /* Terminate! */
+		}
+		else return 0;
+	}
+	else
+	{
+		if( count < SIZE_MAX && mpg123_grow_string(sb, count+1) )
+		{
+			memcpy(sb->p, stuff+from, count);
+			sb->fill = count+1;
+			sb->p[sb->fill-1] = 0; /* Terminate! */
+		}
+		else return 0;
+	}
+	return 1;
+}
+
+int attribute_align_arg mpg123_set_substring(mpg123_string* sb, const char* stuff, size_t from, size_t count)
+{
+	sb->fill = 0;
+	return mpg123_add_substring(sb, stuff, from, count);
+}
+
+int attribute_align_arg mpg123_set_string(mpg123_string* sb, const char* stuff)
+{
+	sb->fill = 0;
+	return mpg123_add_string(sb, stuff);
+}