--- /dev/null
+/*
+ * 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"
+
+static const char zip_tree_usage[] =
+"git-zip-tree [-0|...|-9] <tree-ish> [ <base> ]";
+
+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 (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 cmd_zip_tree(int argc, const char **argv, const char *prefix)
+{
+ unsigned char sha1[20];
+ struct tree *tree;
+ struct commit *commit;
+ time_t archive_time;
+ char *base;
+ int baselen;
+
+ git_config(git_default_config);
+
+ if (argc > 1 && argv[1][0] == '-') {
+ if (isdigit(argv[1][1]) && argv[1][2] == '\0') {
+ zlib_compression_level = argv[1][1] - '0';
+ argc--;
+ argv++;
+ }
+ }
+
+ switch (argc) {
+ case 3:
+ base = strdup(argv[2]);
+ baselen = strlen(base);
+ break;
+ case 2:
+ base = strdup("");
+ baselen = 0;
+ break;
+ default:
+ usage(zip_tree_usage);
+ }
+
+ if (get_sha1(argv[1], sha1))
+ die("Not a valid object name %s", argv[1]);
+
+ commit = lookup_commit_reference_gently(sha1, 1);
+ archive_time = commit ? commit->date : time(NULL);
+ dos_time(&archive_time, &zip_date, &zip_time);
+
+ zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
+ zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
+
+ tree = parse_tree_indirect(sha1);
+ if (!tree)
+ die("not a tree object");
+
+ if (baselen > 0) {
+ write_zip_entry(tree->object.sha1, "", 0, base, 040777, 0);
+ base = xrealloc(base, baselen + 1);
+ base[baselen] = '/';
+ baselen++;
+ base[baselen] = '\0';
+ }
+ read_tree_recursive(tree, base, baselen, 0, NULL, write_zip_entry);
+ write_zip_trailer(commit ? commit->object.sha1 : NULL);
+
+ free(zip_dir);
+ free(base);
+
+ return 0;
+}