From 6ddde92a3a45e970b05770633dc6a337d5d013c5 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ghostscript.com>
Date: Mon, 27 Sep 2004 02:15:04 +0200
Subject: Initial import

---
 filter/buffer.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 filter/buffer.c

(limited to 'filter/buffer.c')

diff --git a/filter/buffer.c b/filter/buffer.c
new file mode 100644
index 00000000..7b728b9b
--- /dev/null
+++ b/filter/buffer.c
@@ -0,0 +1,57 @@
+#include <fitz.h>
+
+fz_error *
+fz_newbuffer(fz_buffer **bp, int size)
+{
+	fz_buffer *b;
+
+	b = *bp = fz_malloc(sizeof(fz_buffer));
+	if (!b) return fz_outofmem;
+
+	b->bp = fz_malloc(size);
+	if (!b->bp) { fz_free(b); return fz_outofmem; }
+
+	b->rp = b->bp;
+	b->wp = b->bp;
+	b->ep = b->bp + size;
+	b->eof = 0;
+
+	return nil;
+}
+
+void
+fz_freebuffer(fz_buffer *buf)
+{
+	fz_free(buf->bp);
+	fz_free(buf);
+}
+
+fz_error *
+fz_growbuffer(fz_buffer *buf)
+{
+	unsigned char *newbp;
+
+	int rp = buf->rp - buf->bp;
+	int wp = buf->wp - buf->bp;
+	int ep = buf->ep - buf->bp;
+
+	newbp = fz_realloc(buf->bp, ep * 2);
+	if (!newbp) return fz_outofmem;
+
+	buf->bp = newbp;
+	buf->rp = buf->bp + rp;
+	buf->wp = buf->bp + wp;
+	buf->ep = buf->bp + ep * 2;
+
+	return nil;
+}
+
+fz_error *
+fz_rewindbuffer(fz_buffer *buf)
+{
+	memmove(buf->bp, buf->rp, buf->wp - buf->rp);
+	buf->wp = buf->bp + (buf->wp - buf->rp);
+	buf->rp = buf->bp;
+	return nil;
+}
+
-- 
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