Rename builtin-zip-tree.c to archive-zip.c

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 333 insertions, 0 deletions

diff --git a/archive-zip.c b/archive-zip.c
new file mode 100644
index 000000000..3ffdad68d
--- /dev/null
+++ b/archive-zip.c
@@ -0,0 +1,333 @@
+/*
+ * Copyright (c) 2006 Rene Scharfe
+ */
+#include <time.h>
+#include "cache.h"
+#include "commit.h"
+#include "blob.h"
+#include "tree.h"
+#include "quote.h"
+#include "builtin.h"
+#include "archive.h"
+
+static int verbose;
+static int zip_date;
+static int zip_time;
+
+static unsigned char *zip_dir;
+static unsigned int zip_dir_size;
+
+static unsigned int zip_offset;
+static unsigned int zip_dir_offset;
+static unsigned int zip_dir_entries;
+
+#define ZIP_DIRECTORY_MIN_SIZE	(1024 * 1024)
+
+struct zip_local_header {
+	unsigned char magic[4];
+	unsigned char version[2];
+	unsigned char flags[2];
+	unsigned char compression_method[2];
+	unsigned char mtime[2];
+	unsigned char mdate[2];
+	unsigned char crc32[4];
+	unsigned char compressed_size[4];
+	unsigned char size[4];
+	unsigned char filename_length[2];
+	unsigned char extra_length[2];
+};
+
+struct zip_dir_header {
+	unsigned char magic[4];
+	unsigned char creator_version[2];
+	unsigned char version[2];
+	unsigned char flags[2];
+	unsigned char compression_method[2];
+	unsigned char mtime[2];
+	unsigned char mdate[2];
+	unsigned char crc32[4];
+	unsigned char compressed_size[4];
+	unsigned char size[4];
+	unsigned char filename_length[2];
+	unsigned char extra_length[2];
+	unsigned char comment_length[2];
+	unsigned char disk[2];
+	unsigned char attr1[2];
+	unsigned char attr2[4];
+	unsigned char offset[4];
+};
+
+struct zip_dir_trailer {
+	unsigned char magic[4];
+	unsigned char disk[2];
+	unsigned char directory_start_disk[2];
+	unsigned char entries_on_this_disk[2];
+	unsigned char entries[2];
+	unsigned char size[4];
+	unsigned char offset[4];
+	unsigned char comment_length[2];
+};
+
+static void copy_le16(unsigned char *dest, unsigned int n)
+{
+	dest[0] = 0xff & n;
+	dest[1] = 0xff & (n >> 010);
+}
+
+static void copy_le32(unsigned char *dest, unsigned int n)
+{
+	dest[0] = 0xff & n;
+	dest[1] = 0xff & (n >> 010);
+	dest[2] = 0xff & (n >> 020);
+	dest[3] = 0xff & (n >> 030);
+}
+
+static void *zlib_deflate(void *data, unsigned long size,
+                          unsigned long *compressed_size)
+{
+	z_stream stream;
+	unsigned long maxsize;
+	void *buffer;
+	int result;
+
+	memset(&stream, 0, sizeof(stream));
+	deflateInit(&stream, zlib_compression_level);
+	maxsize = deflateBound(&stream, size);
+	buffer = xmalloc(maxsize);
+
+	stream.next_in = data;
+	stream.avail_in = size;
+	stream.next_out = buffer;
+	stream.avail_out = maxsize;
+
+	do {
+		result = deflate(&stream, Z_FINISH);
+	} while (result == Z_OK);
+
+	if (result != Z_STREAM_END) {
+		free(buffer);
+		return NULL;
+	}
+
+	deflateEnd(&stream);
+	*compressed_size = stream.total_out;
+
+	return buffer;
+}
+
+static char *construct_path(const char *base, int baselen,
+                            const char *filename, int isdir, int *pathlen)
+{
+	int filenamelen = strlen(filename);
+	int len = baselen + filenamelen;
+	char *path, *p;
+
+	if (isdir)
+		len++;
+	p = path = xmalloc(len + 1);
+
+	memcpy(p, base, baselen);
+	p += baselen;
+	memcpy(p, filename, filenamelen);
+	p += filenamelen;
+	if (isdir)
+		*p++ = '/';
+	*p = '\0';
+
+	*pathlen = len;
+
+	return path;
+}
+
+static int write_zip_entry(const unsigned char *sha1,
+                           const char *base, int baselen,
+                           const char *filename, unsigned mode, int stage)
+{
+	struct zip_local_header header;
+	struct zip_dir_header dirent;
+	unsigned long compressed_size;
+	unsigned long uncompressed_size;
+	unsigned long crc;
+	unsigned long direntsize;
+	unsigned long size;
+	int method;
+	int result = -1;
+	int pathlen;
+	unsigned char *out;
+	char *path;
+	char type[20];
+	void *buffer = NULL;
+	void *deflated = NULL;
+
+	crc = crc32(0, Z_NULL, 0);
+
+	path = construct_path(base, baselen, filename, S_ISDIR(mode), &pathlen);
+	if (verbose)
+		fprintf(stderr, "%s\n", path);
+	if (pathlen > 0xffff) {
+		error("path too long (%d chars, SHA1: %s): %s", pathlen,
+		      sha1_to_hex(sha1), path);
+		goto out;
+	}
+
+	if (S_ISDIR(mode)) {
+		method = 0;
+		result = READ_TREE_RECURSIVE;
+		out = NULL;
+		uncompressed_size = 0;
+		compressed_size = 0;
+	} else if (S_ISREG(mode)) {
+		method = zlib_compression_level == 0 ? 0 : 8;
+		result = 0;
+		buffer = read_sha1_file(sha1, type, &size);
+		if (!buffer)
+			die("cannot read %s", sha1_to_hex(sha1));
+		crc = crc32(crc, buffer, size);
+		out = buffer;
+		uncompressed_size = size;
+		compressed_size = size;
+	} else {
+		error("unsupported file mode: 0%o (SHA1: %s)", mode,
+		      sha1_to_hex(sha1));
+		goto out;
+	}
+
+	if (method == 8) {
+		deflated = zlib_deflate(buffer, size, &compressed_size);
+		if (deflated && compressed_size - 6 < size) {
+			/* ZLIB --> raw compressed data (see RFC 1950) */
+			/* CMF and FLG ... */
+			out = (unsigned char *)deflated + 2;
+			compressed_size -= 6;	/* ... and ADLER32 */
+		} else {
+			method = 0;
+			compressed_size = size;
+		}
+	}
+
+	/* make sure we have enough free space in the dictionary */
+	direntsize = sizeof(struct zip_dir_header) + pathlen;
+	while (zip_dir_size < zip_dir_offset + direntsize) {
+		zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
+		zip_dir = xrealloc(zip_dir, zip_dir_size);
+	}
+
+	copy_le32(dirent.magic, 0x02014b50);
+	copy_le16(dirent.creator_version, 0);
+	copy_le16(dirent.version, 20);
+	copy_le16(dirent.flags, 0);
+	copy_le16(dirent.compression_method, method);
+	copy_le16(dirent.mtime, zip_time);
+	copy_le16(dirent.mdate, zip_date);
+	copy_le32(dirent.crc32, crc);
+	copy_le32(dirent.compressed_size, compressed_size);
+	copy_le32(dirent.size, uncompressed_size);
+	copy_le16(dirent.filename_length, pathlen);
+	copy_le16(dirent.extra_length, 0);
+	copy_le16(dirent.comment_length, 0);
+	copy_le16(dirent.disk, 0);
+	copy_le16(dirent.attr1, 0);
+	copy_le32(dirent.attr2, 0);
+	copy_le32(dirent.offset, zip_offset);
+	memcpy(zip_dir + zip_dir_offset, &dirent, sizeof(struct zip_dir_header));
+	zip_dir_offset += sizeof(struct zip_dir_header);
+	memcpy(zip_dir + zip_dir_offset, path, pathlen);
+	zip_dir_offset += pathlen;
+	zip_dir_entries++;
+
+	copy_le32(header.magic, 0x04034b50);
+	copy_le16(header.version, 20);
+	copy_le16(header.flags, 0);
+	copy_le16(header.compression_method, method);
+	copy_le16(header.mtime, zip_time);
+	copy_le16(header.mdate, zip_date);
+	copy_le32(header.crc32, crc);
+	copy_le32(header.compressed_size, compressed_size);
+	copy_le32(header.size, uncompressed_size);
+	copy_le16(header.filename_length, pathlen);
+	copy_le16(header.extra_length, 0);
+	write_or_die(1, &header, sizeof(struct zip_local_header));
+	zip_offset += sizeof(struct zip_local_header);
+	write_or_die(1, path, pathlen);
+	zip_offset += pathlen;
+	if (compressed_size > 0) {
+		write_or_die(1, out, compressed_size);
+		zip_offset += compressed_size;
+	}
+
+out:
+	free(buffer);
+	free(deflated);
+	free(path);
+
+	return result;
+}
+
+static void write_zip_trailer(const unsigned char *sha1)
+{
+	struct zip_dir_trailer trailer;
+
+	copy_le32(trailer.magic, 0x06054b50);
+	copy_le16(trailer.disk, 0);
+	copy_le16(trailer.directory_start_disk, 0);
+	copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
+	copy_le16(trailer.entries, zip_dir_entries);
+	copy_le32(trailer.size, zip_dir_offset);
+	copy_le32(trailer.offset, zip_offset);
+	copy_le16(trailer.comment_length, sha1 ? 40 : 0);
+
+	write_or_die(1, zip_dir, zip_dir_offset);
+	write_or_die(1, &trailer, sizeof(struct zip_dir_trailer));
+	if (sha1)
+		write_or_die(1, sha1_to_hex(sha1), 40);
+}
+
+static void dos_time(time_t *time, int *dos_date, int *dos_time)
+{
+	struct tm *t = localtime(time);
+
+	*dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
+	            (t->tm_year + 1900 - 1980) * 512;
+	*dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
+}
+
+int write_zip_archive(struct archiver_args *args)
+{
+	int plen = strlen(args->base);
+
+	dos_time(&args->time, &zip_date, &zip_time);
+
+	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
+	zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
+	verbose = args->verbose;
+
+	if (args->base && plen > 0 && args->base[plen - 1] == '/') {
+		char *base = xstrdup(args->base);
+		int baselen = strlen(base);
+
+		while (baselen > 0 && base[baselen - 1] == '/')
+			base[--baselen] = '\0';
+		write_zip_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
+		free(base);
+	}
+	read_tree_recursive(args->tree, args->base, plen, 0,
+			    args->pathspec, write_zip_entry);
+	write_zip_trailer(args->commit_sha1);
+
+	free(zip_dir);
+
+	return 0;
+}
+
+void *parse_extra_zip_args(int argc, const char **argv)
+{
+	for (; argc > 0; argc--, argv++) {
+		const char *arg = argv[0];
+
+		if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0')
+			zlib_compression_level = arg[1] - '0';
+		else
+			die("Unknown argument for zip format: %s", arg);
+	}
+	return NULL;
+}