From 179fa413b047bede6e32109e2ce82437c5fb8d34 Mon Sep 17 00:00:00 2001
From: MenTaLguY <mental@rydia.net>
Date: Mon, 16 Jan 2006 02:36:01 +0000
Subject: moving trunk for module inkscape

(bzr r1)
---
 src/streams-jar.cpp | 146 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 src/streams-jar.cpp

(limited to 'src/streams-jar.cpp')

diff --git a/src/streams-jar.cpp b/src/streams-jar.cpp
new file mode 100644
index 000000000..ffaccc2e4
--- /dev/null
+++ b/src/streams-jar.cpp
@@ -0,0 +1,146 @@
+#include "streams-jar.h"
+
+namespace Inkscape {
+
+const int LOC_EXTRA = 6;  // extra bytes
+const int LOC_COMP  = 8;  // compression method
+const int LOC_CSIZE = 18; // compressed size
+const int LOC_FNLEN = 26; // filename length
+const int LOC_EFLEN = 28; // extra-field length
+
+void JarBuffer::consume_header() throw(JarHeaderException)
+{
+    try {
+	guint8 data[30];
+	_urihandle->read(data, 4);
+    	check_signature(data);
+	_urihandle->read(data+4, 26);
+	compressed_size = compressed_left = unpack_4bytes(data, LOC_CSIZE);
+	guint16 filename_length = unpack_2bytes(data, LOC_FNLEN);
+	eflen = unpack_2bytes(data, LOC_EFLEN);
+	flags = unpack_2bytes(data, LOC_EXTRA);
+	method = unpack_2bytes(data, LOC_COMP);
+	
+#ifdef DEBUG_STREAMS    
+	std::printf("Compressed size is %u\n", compressed_size);
+	std::printf("Filename length is %hu\n", filename_length);
+	std::printf("Extra field length is %hu\n", eflen);
+	std::printf("Flags are %#hx\n", flags);
+	std::printf("Compression method is %#hx\n", method);
+#endif
+    
+	//guint32 crc = check_crc(data, flags);
+	gchar filename[filename_length+1];
+	_urihandle->read(filename, filename_length);
+	filename[filename_length] = '\0';
+
+#ifdef DEBUG_STREAMS
+	std::printf("Filename is %s\n", filename);
+#endif
+    }
+    catch (std::exception& e) {
+	throw JarHeaderException();
+    }
+}
+
+void JarBuffer::check_signature(guint8 *data) throw(JarHeaderException)
+{
+    guint32 signature = unpack_4bytes(data, 0);
+
+#ifdef DEBUG_STREAMS
+    std::printf("signature is %x\n", signature);
+#endif
+
+    if (signature == 0x08074b50) {
+	_urihandle->read(data, 12);
+    } else if (signature != 0x02014b50 && signature != 0x04034b50) {
+	throw JarHeaderException();
+    }
+}
+
+void JarBuffer::reset()//resets zlib and buffer (also skips archived directories)
+{
+    bool do_reset = false;
+    while (compressed_left == 0) {
+	consume_header();
+	do_reset = true;
+    }
+
+    if (do_reset) {
+	reset_inflation();
+	setg(eback(), eback(), eback());
+    }
+}
+
+int JarBuffer::consume_and_inflate()
+{
+    int nbytes;
+    
+    reset();
+
+    nbytes = compressed_left > BUFSIZE_STREAM ? BUFSIZE_STREAM 
+	    : compressed_left;
+    
+    if (is_compressed())
+	return consume_compressed(nbytes);
+    else
+	return consume_uncompressed(nbytes);
+}
+
+int JarBuffer::consume_compressed(int nbytes)
+{
+    int ret;
+
+    if ((ret = do_consume_and_inflate(nbytes)) == EOF && eflen > 0) {
+	guint8 efbuf[eflen];
+	_urihandle->read(efbuf, eflen);
+	return 1;
+    } 
+
+    return ret;
+}
+
+int JarBuffer::consume_uncompressed(int nbytes)
+{
+    guint8 data[nbytes];
+    if (consume(data, nbytes) == EOF)
+	return EOF;
+    
+    copy_to_get(data, nbytes);
+    compressed_left -= nbytes;
+
+    return nbytes;
+}
+
+GByteArray *JarBuffer::inflate(guint8 *data, const int nbytes)
+{
+    GByteArray *gba = do_inflate(data, nbytes);
+    compressed_left -= nbytes;
+    return gba;
+}
+
+guint32 JarBuffer::unpack_4bytes(guint8 *data, const int offset) 
+{
+    return ((guint32)data[offset] 
+	    + (((guint32)data[offset + 1]) << 8)
+	    + (((guint32)data[offset + 2]) << 16) 
+	    + (((guint32)data[offset + 3]) << 24));
+}
+
+guint16 JarBuffer::unpack_2bytes(guint8 *data, int offset)
+{
+    return ((guint16)data[offset] + (((guint16)data[offset + 1]) << 8));
+}
+
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :
-- 
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