New upstream version 5.6.0~alpha1+dfsgupstream/5.6.0_alpha1+dfsg

1 files changed, 150 insertions, 0 deletions

diff --git a/ext/zip/lib/zip_source_window.c b/ext/zip/lib/zip_source_window.c
new file mode 100644
index 000000000..24d8648c8
--- /dev/null
+++ b/ext/zip/lib/zip_source_window.c
@@ -0,0 +1,150 @@
+/*
+  zip_source_window.c -- return part of lower source
+  Copyright (C) 2012-2014 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <libzip@nih.at>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+     the documentation and/or other materials provided with the
+     distribution.
+  3. The names of the authors may not be used to endorse or promote
+     products derived from this software without specific prior
+     written permission.
+ 
+  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "zipint.h"
+
+struct window {
+    zip_uint64_t skip;
+    zip_uint64_t len;
+    zip_uint64_t left;
+    int e[2];
+};
+
+static zip_int64_t window_read(struct zip_source *, void *, void *,
+			       zip_uint64_t, enum zip_source_cmd);
+
+
+
+struct zip_source *
+zip_source_window(struct zip *za, struct zip_source *src, zip_uint64_t start, zip_uint64_t len)
+{
+    struct window *ctx;
+
+    if (src == NULL) {
+	_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
+	return NULL;
+    }
+
+    if ((ctx=(struct window *)malloc(sizeof(*ctx))) == NULL) {
+	_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
+	return NULL;
+    }
+
+    ctx->skip = start;
+    ctx->len = len;
+    ctx->left = len;
+
+    return zip_source_layered(za, src, window_read, ctx);
+}
+
+
+
+static zip_int64_t
+window_read(struct zip_source *src, void *_ctx, void *data,
+	    zip_uint64_t len, enum zip_source_cmd cmd)
+{
+    struct window *ctx;
+    zip_int64_t ret;
+    zip_uint64_t n, i;
+    char b[8192];
+
+    ctx = (struct window *)_ctx;
+
+    switch (cmd) {
+    case ZIP_SOURCE_OPEN:
+	for (n=0; n<ctx->skip; n+=(zip_uint64_t)ret) {
+	    i = (ctx->skip-n > sizeof(b) ? sizeof(b) : ctx->skip-n);
+	    if ((ret=zip_source_read(src, b, i)) < 0)
+		return ZIP_SOURCE_ERR_LOWER;
+	    if (ret==0) {
+		ctx->e[0] = ZIP_ER_EOF;
+		ctx->e[1] = 0;
+		return -1;
+	    }
+	}
+	return 0;
+
+    case ZIP_SOURCE_READ:
+	if (len > ctx->left)
+	    len = ctx->left;
+	
+	if (len == 0)
+	    return 0;
+
+	if ((ret=zip_source_read(src, data, len)) < 0)
+	    return ZIP_SOURCE_ERR_LOWER;
+
+	ctx->left -= (zip_uint64_t)ret;
+
+        if (ret == 0) {
+	    if (ctx->left > 0) {
+		ctx->e[0] = ZIP_ER_EOF;
+		ctx->e[1] = 0;
+		return -1;
+	    }
+	}
+	return ret;
+
+    case ZIP_SOURCE_CLOSE:
+	return 0;
+
+    case ZIP_SOURCE_STAT:
+	{
+	    struct zip_stat *st;
+
+	    st = (struct zip_stat *)data;
+
+	    st->size = ctx->len;
+	    st->valid |= ZIP_STAT_SIZE;
+	    st->valid &= ~(ZIP_STAT_CRC|ZIP_STAT_COMP_SIZE);
+	}
+	return 0;
+	
+    case ZIP_SOURCE_ERROR:
+	memcpy(data, ctx->e, sizeof(ctx->e));
+	return 0;
+
+    case ZIP_SOURCE_FREE:
+	free(ctx);
+	return 0;
+
+    default:
+	return -1;
+    }
+    
+}