1 files changed, 237 insertions, 0 deletions
diff --git a/filter/filer.c b/filter/filer.c
new file mode 100644
index 00000000..804d7f7e
--- /dev/null
+++ b/filter/filer.c
@@ -0,0 +1,237 @@
+#include <fitz.h>
+
+static int doread(fz_buffer *b, int fd)
+{
+	int n = read(fd, b->wp, b->ep - b->wp);
+	if (n == -1)
+		return -1;
+	if (n == 0)
+		b->eof = 1;
+	b->wp += n;
+	return n;
+}
+
+static int producedata(fz_file *f)
+{
+	fz_error *reason;
+	int produced;
+	int n;
+
+	assert(f->mode == O_RDONLY);
+	assert(f->error == nil);
+
+	if (!f->filter)
+	{
+		fz_rewindbuffer(f->out);
+		n = doread(f->out, f->fd);
+		if (n < 0) {
+			f->error = fz_throw("ioerror in read: %s", strerror(errno));
+			return -1;
+		}
+		return 0;
+	}
+
+	produced = 0;
+
+	while (1)
+	{
+		reason = fz_process(f->filter, f->in, f->out);
+
+		if (f->filter->produced)
+			produced = 1;
+
+		if (reason == fz_ioneedin)
+		{
+			if (f->in->eof) {
+				f->error = fz_throw("ioerror: premature eof in filter");
+				return -1;
+			}
+
+			/* no space to produce, rewind or grow */
+			if (f->in->wp == f->in->ep)
+			{
+				if (f->in->rp > f->in->bp)
+					f->error = fz_rewindbuffer(f->in);
+				else
+					f->error = fz_growbuffer(f->in);
+				if (f->error)
+					return -1;
+			}
+
+			/* then fill with more input */
+			n = doread(f->in, f->fd);
+			if (n < 0) {
+				f->error = fz_throw("ioerror in read: %s", strerror(errno));
+				return -1;
+			}
+
+			if (produced)
+				return 0;
+		}
+
+		else if (reason == fz_ioneedout)
+		{
+			if (produced)
+				return 0;
+
+			/* need more outspace, and produced no data */
+			if (f->out->rp > f->out->bp)
+				f->error = fz_rewindbuffer(f->out);
+			else
+				f->error = fz_growbuffer(f->out);
+			if (f->error)
+				return -1;
+		}
+
+		else if (reason == fz_iodone)
+			return 0;
+
+		else {
+			f->error = reason;
+			return -1;
+		}
+	}
+}
+
+int
+fz_peekbyte(fz_file *f)
+{
+	if (f->out->rp == f->out->wp)
+	{
+		if (f->out->eof) return EOF;
+		if (producedata(f)) return EOF;
+	}
+
+	if (f->out->rp < f->out->wp)
+		return *f->out->rp;
+
+	return EOF;
+}
+
+int
+fz_readbyte(fz_file *f)
+{
+	if (f->out->rp == f->out->wp)
+	{
+		if (f->out->eof) return EOF;
+		if (producedata(f)) return EOF;
+	}
+
+	if (f->out->rp < f->out->wp)
+		return *f->out->rp++;
+
+	return EOF;
+}
+
+int
+fz_read(fz_file *f, char *buf, int n)
+{
+	int i = 0;
+
+	while (i < n)
+	{
+		while (f->out->rp < f->out->wp && i < n)
+			buf[i++] = *f->out->rp ++;
+
+		if (f->out->rp == f->out->wp)
+		{
+			if (f->out->eof) return i;
+			if (producedata(f) < 0) return -1;
+		}
+	}
+
+	return i;
+}
+
+int
+fz_readline(fz_file *f, char *buf, int n)
+{
+	int c = EOF;
+	char *s = buf;
+
+	while (n > 1)
+	{
+		c = fz_readbyte(f);
+		if (c == EOF)
+			break;
+		if (c == '\r') {
+			c = fz_peekbyte(f);
+			if (c == '\n')
+				c = fz_readbyte(f);
+			break;
+		}
+		if (c == '\n')
+			break;
+		*s++ = c;
+		n--;
+	}
+	if (n)
+		*s = '\0';
+	return s - buf;
+}
+
+/*
+ * Utility function to consume contents of file stream into
+ * a freshly allocated buffer; realloced and trimmed to size.
+ */
+
+enum { CHUNKSIZE = 4096 };
+
+fz_error *
+fz_readfile(unsigned char **bufp, int *lenp, fz_file *file)
+{
+	unsigned char *newbuf;
+	unsigned char *buf;
+	int len;
+	int pos;
+	int n;
+
+	*bufp = nil;
+	*lenp = 0;
+
+	len = 0;
+	pos = 0;
+	buf = nil;
+
+	while (1)
+	{
+		if (len - pos == 0)
+		{
+			len += CHUNKSIZE;
+			newbuf = fz_realloc(buf, len);
+			if (!newbuf)
+			{
+				fz_free(buf);
+				return fz_outofmem;
+			}
+			buf = newbuf;
+		}
+
+		n = fz_read(file, buf + pos, len - pos);
+
+printf("fz_read %d bytes\n", n);
+
+		if (n < 0)
+		{
+			fz_free(buf);
+			return fz_ferror(file);
+		}
+
+		pos += n;
+
+		if (n < CHUNKSIZE)
+		{
+			newbuf = fz_realloc(buf, pos);
+			if (!newbuf)
+			{
+				fz_free(buf);
+				return fz_outofmem;
+			}
+
+			*bufp = newbuf;
+			*lenp = pos;
+			return nil;
+		}
+	}
+}
+