From 0a927854a10e1e6b9770a81e2e1d9f3093631757 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Wed, 19 Jun 2013 15:29:44 +0200
Subject: Rearrange source files.

---
 source/fitz/stream-read.c | 219 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 219 insertions(+)
 create mode 100644 source/fitz/stream-read.c

(limited to 'source/fitz/stream-read.c')

diff --git a/source/fitz/stream-read.c b/source/fitz/stream-read.c
new file mode 100644
index 00000000..ee3d1cad
--- /dev/null
+++ b/source/fitz/stream-read.c
@@ -0,0 +1,219 @@
+#include "mupdf/fitz.h"
+
+#define MIN_BOMB (100 << 20)
+
+int
+fz_read(fz_stream *stm, unsigned char *buf, int len)
+{
+	int count, n;
+
+	count = fz_mini(len, stm->wp - stm->rp);
+	if (count)
+	{
+		memcpy(buf, stm->rp, count);
+		stm->rp += count;
+	}
+
+	if (count == len || stm->error || stm->eof)
+		return count;
+
+	assert(stm->rp == stm->wp);
+
+	if (len - count < stm->ep - stm->bp)
+	{
+		n = stm->read(stm, stm->bp, stm->ep - stm->bp);
+		if (n == 0)
+		{
+			stm->eof = 1;
+		}
+		else if (n > 0)
+		{
+			stm->rp = stm->bp;
+			stm->wp = stm->bp + n;
+			stm->pos += n;
+		}
+
+		n = fz_mini(len - count, stm->wp - stm->rp);
+		if (n)
+		{
+			memcpy(buf + count, stm->rp, n);
+			stm->rp += n;
+			count += n;
+		}
+	}
+	else
+	{
+		n = stm->read(stm, buf + count, len - count);
+		if (n == 0)
+		{
+			stm->eof = 1;
+		}
+		else if (n > 0)
+		{
+			stm->pos += n;
+			count += n;
+		}
+	}
+
+	return count;
+}
+
+void
+fz_fill_buffer(fz_stream *stm)
+{
+	int n;
+
+	assert(stm->rp == stm->wp);
+
+	if (stm->error || stm->eof)
+		return;
+
+	fz_try(stm->ctx)
+	{
+		n = stm->read(stm, stm->bp, stm->ep - stm->bp);
+		if (n == 0)
+		{
+			stm->eof = 1;
+		}
+		else if (n > 0)
+		{
+			stm->rp = stm->bp;
+			stm->wp = stm->bp + n;
+			stm->pos += n;
+		}
+	}
+	fz_catch(stm->ctx)
+	{
+		/* FIXME: TryLater */
+		fz_warn(stm->ctx, "read error; treating as end of file");
+		stm->error = 1;
+	}
+}
+
+fz_buffer *
+fz_read_all(fz_stream *stm, int initial)
+{
+	return fz_read_best(stm, initial, NULL);
+}
+
+fz_buffer *
+fz_read_best(fz_stream *stm, int initial, int *truncated)
+{
+	fz_buffer *buf = NULL;
+	int n;
+	fz_context *ctx = stm->ctx;
+
+	fz_var(buf);
+
+	if (truncated)
+		*truncated = 0;
+
+	fz_try(ctx)
+	{
+		if (initial < 1024)
+			initial = 1024;
+
+		buf = fz_new_buffer(ctx, initial+1);
+
+		while (1)
+		{
+			if (buf->len == buf->cap)
+				fz_grow_buffer(ctx, buf);
+
+			if (buf->len >= MIN_BOMB && buf->len / 200 > initial)
+			{
+				fz_throw(ctx, FZ_ERROR_GENERIC, "compression bomb detected");
+			}
+
+			n = fz_read(stm, buf->data + buf->len, buf->cap - buf->len);
+			if (n == 0)
+				break;
+
+			buf->len += n;
+		}
+	}
+	fz_catch(ctx)
+	{
+		/* FIXME: TryLater */
+		if (truncated)
+		{
+			*truncated = 1;
+		}
+		else
+		{
+			fz_drop_buffer(ctx, buf);
+			fz_rethrow(ctx);
+		}
+	}
+	fz_trim_buffer(ctx, buf);
+
+	return buf;
+}
+
+void
+fz_read_line(fz_stream *stm, char *mem, int n)
+{
+	char *s = mem;
+	int c = EOF;
+	while (n > 1)
+	{
+		c = fz_read_byte(stm);
+		if (c == EOF)
+			break;
+		if (c == '\r') {
+			c = fz_peek_byte(stm);
+			if (c == '\n')
+				fz_read_byte(stm);
+			break;
+		}
+		if (c == '\n')
+			break;
+		*s++ = c;
+		n--;
+	}
+	if (n)
+		*s = '\0';
+}
+
+int
+fz_tell(fz_stream *stm)
+{
+	return stm->pos - (stm->wp - stm->rp);
+}
+
+void
+fz_seek(fz_stream *stm, int offset, int whence)
+{
+	if (stm->seek)
+	{
+		if (whence == 1)
+		{
+			offset = fz_tell(stm) + offset;
+			whence = 0;
+		}
+		if (whence == 0)
+		{
+			int dist = stm->pos - offset;
+			if (dist >= 0 && dist <= stm->wp - stm->bp)
+			{
+				stm->rp = stm->wp - dist;
+				stm->eof = 0;
+				return;
+			}
+		}
+		stm->seek(stm, offset, whence);
+		stm->eof = 0;
+	}
+	else if (whence != 2)
+	{
+		if (whence == 0)
+			offset -= fz_tell(stm);
+		if (offset < 0)
+			fz_warn(stm->ctx, "cannot seek backwards");
+		/* dog slow, but rare enough */
+		while (offset-- > 0)
+			fz_read_byte(stm);
+	}
+	else
+		fz_warn(stm->ctx, "cannot seek");
+}
-- 
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