Initial commit of some stuff written so far. Still in state of flux. Expect

breakage and major changes.

1 files changed, 125 insertions, 0 deletions

diff --git a/src/blob.c b/src/blob.c
new file mode 100644
index 0000000..eecf642
--- /dev/null
+++ b/src/blob.c
@@ -0,0 +1,125 @@
+/* blob.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
+ * Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation. See http://www.gnu.org/ for details.
+ */
+
+#include <malloc.h>
+#include <string.h>
+
+#include "apk_blob.h"
+
+char *apk_blob_cstr(apk_blob_t blob)
+{
+	char *cstr;
+
+	if (blob.ptr[blob.len-1] == 0)
+		return strdup(blob.ptr);
+
+	cstr = malloc(blob.len + 1);
+	memcpy(cstr, blob.ptr, blob.len);
+	cstr[blob.len] = 0;
+
+	return cstr;
+}
+
+int apk_blob_rsplit(apk_blob_t blob, char split, apk_blob_t *l, apk_blob_t *r)
+{
+	char *sep;
+
+	sep = memrchr(blob.ptr, split, blob.len);
+	if (sep == NULL)
+		return 0;
+
+	if (l != NULL)
+		*l = APK_BLOB_PTR_PTR(blob.ptr, sep - 1);
+	if (r != NULL)
+		*r = APK_BLOB_PTR_PTR(sep + 1, blob.ptr + blob.len);
+
+	return 1;
+}
+
+int apk_blob_splitstr(apk_blob_t blob, char *split, apk_blob_t *l, apk_blob_t *r)
+{
+	int splitlen = strlen(split);
+	char *pos = blob.ptr, *end = blob.ptr + blob.len - splitlen + 1;
+
+	if (end < pos)
+		return 0;
+
+	while (1) {
+		pos = memchr(pos, split[0], end - pos);
+		if (pos == NULL)
+			return 0;
+
+		if (memcmp(pos, split, splitlen) != 0) {
+			pos++;
+			continue;
+		}
+
+		*l = APK_BLOB_PTR_PTR(blob.ptr, pos-1);
+		*r = APK_BLOB_PTR_PTR(pos+splitlen, blob.ptr+blob.len-1);
+		return 1;
+	}
+}
+
+static int dx(int c)
+{
+	if (c >= '0' && c <= '9')
+		return c - '0';
+	if (c >= 'a' && c <= 'f')
+		return c - 'a' + 0xa;
+	if (c >= 'A' && c <= 'F')
+		return c - 'A' + 0xa;
+	return -1;
+}
+
+unsigned apk_blob_uint(apk_blob_t blob, int base)
+{
+	unsigned val;
+	int i, ch;
+
+	val = 0;
+	for (i = 0; i < blob.len; i++) {
+		if (blob.ptr[i] == 0)
+			break;
+		ch = dx(blob.ptr[i]);
+		if (ch < 0 || ch >= base)
+			return 0;
+		val *= base;
+		val += ch;
+	}
+	return val;
+}
+
+int apk_hexdump_parse(apk_blob_t to, apk_blob_t from)
+{
+	int i;
+
+	if (to.len * 2 != from.len)
+		return -1;
+
+	for (i = 0; i < from.len / 2; i++)
+		to.ptr[i] = (dx(from.ptr[i*2]) << 4) + dx(from.ptr[i*2+1]);
+
+	return 0;
+}
+
+int apk_hexdump_format(int tolen, char *to, apk_blob_t from)
+{
+	static const char *xd = "0123456789abcdef";
+	int i;
+
+	for (i = 0; i < from.len && i*2+2 < tolen; i++) {
+		to[i*2+0] = xd[(from.ptr[i] >> 4) & 0xf];
+		to[i*2+1] = xd[from.ptr[i] & 0xf];
+	}
+	to[i*2] = 0;
+
+	return i*2;
+}