xps: Rearrange files, part two.

1 files changed, 94 insertions, 0 deletions

diff --git a/xps/xps_util.c b/xps/xps_util.c
new file mode 100644
index 00000000..76175d68
--- /dev/null
+++ b/xps/xps_util.c
@@ -0,0 +1,94 @@
+#include "fitz.h"
+#include "muxps.h"
+
+static inline int tolower(int c)
+{
+	if (c >= 'A' && c <= 'Z')
+		return c + 32;
+	return c;
+}
+
+int
+xps_strcasecmp(char *a, char *b)
+{
+	while (tolower(*a) == tolower(*b))
+	{
+		if (*a++ == 0)
+			return 0;
+		b++;
+	}
+	return tolower(*a) - tolower(*b);
+}
+
+#define SEP(x)	((x)=='/' || (x) == 0)
+
+static char *
+xps_clean_path(char *name)
+{
+	char *p, *q, *dotdot;
+	int rooted;
+
+	rooted = name[0] == '/';
+
+	/*
+	 * invariants:
+	 *		p points at beginning of path element we're considering.
+	 *		q points just past the last path element we wrote (no slash).
+	 *		dotdot points just past the point where .. cannot backtrack
+	 *				any further (no slash).
+	 */
+	p = q = dotdot = name + rooted;
+	while (*p)
+	{
+		if(p[0] == '/') /* null element */
+			p++;
+		else if (p[0] == '.' && SEP(p[1]))
+			p += 1; /* don't count the separator in case it is nul */
+		else if (p[0] == '.' && p[1] == '.' && SEP(p[2]))
+		{
+			p += 2;
+			if (q > dotdot) /* can backtrack */
+			{
+				while(--q > dotdot && *q != '/')
+					;
+			}
+			else if (!rooted) /* /.. is / but ./../ is .. */
+			{
+				if (q != name)
+					*q++ = '/';
+				*q++ = '.';
+				*q++ = '.';
+				dotdot = q;
+			}
+		}
+		else /* real path element */
+		{
+			if (q != name+rooted)
+				*q++ = '/';
+			while ((*q = *p) != '/' && *q != 0)
+				p++, q++;
+		}
+	}
+
+	if (q == name) /* empty string is really "." */
+		*q++ = '.';
+	*q = '\0';
+
+	return name;
+}
+
+void
+xps_absolute_path(char *output, char *base_uri, char *path, int output_size)
+{
+	if (path[0] == '/')
+	{
+		fz_strlcpy(output, path, output_size);
+	}
+	else
+	{
+		fz_strlcpy(output, base_uri, output_size);
+		fz_strlcat(output, "/", output_size);
+		fz_strlcat(output, path, output_size);
+	}
+	xps_clean_path(output);
+}