Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 654 insertions, 0 deletions

diff --git a/archive-zip.c b/archive-zip.c
new file mode 100644
index 0000000000..4d66b5be6e
--- /dev/null
+++ b/archive-zip.c
@@ -0,0 +1,654 @@
+/*
+ * Copyright (c) 2006 Rene Scharfe
+ */
+#include "cache.h"
+#include "config.h"
+#include "archive.h"
+#include "streaming.h"
+#include "utf8.h"
+#include "object-store.h"
+#include "userdiff.h"
+#include "xdiff-interface.h"
+
+static int zip_date;
+static int zip_time;
+
+/* We only care about the "buf" part here. */
+static struct strbuf zip_dir;
+
+static uintmax_t zip_offset;
+static uint64_t zip_dir_entries;
+
+static unsigned int max_creator_version;
+
+#define ZIP_STREAM	(1 <<  3)
+#define ZIP_UTF8	(1 << 11)
+
+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];
+	unsigned char _end[1];
+};
+
+struct zip_data_desc {
+	unsigned char magic[4];
+	unsigned char crc32[4];
+	unsigned char compressed_size[4];
+	unsigned char size[4];
+	unsigned char _end[1];
+};
+
+struct zip64_data_desc {
+	unsigned char magic[4];
+	unsigned char crc32[4];
+	unsigned char compressed_size[8];
+	unsigned char size[8];
+	unsigned char _end[1];
+};
+
+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];
+	unsigned char _end[1];
+};
+
+struct zip_extra_mtime {
+	unsigned char magic[2];
+	unsigned char extra_size[2];
+	unsigned char flags[1];
+	unsigned char mtime[4];
+	unsigned char _end[1];
+};
+
+struct zip64_extra {
+	unsigned char magic[2];
+	unsigned char extra_size[2];
+	unsigned char size[8];
+	unsigned char compressed_size[8];
+	unsigned char _end[1];
+};
+
+struct zip64_dir_trailer {
+	unsigned char magic[4];
+	unsigned char record_size[8];
+	unsigned char creator_version[2];
+	unsigned char version[2];
+	unsigned char disk[4];
+	unsigned char directory_start_disk[4];
+	unsigned char entries_on_this_disk[8];
+	unsigned char entries[8];
+	unsigned char size[8];
+	unsigned char offset[8];
+	unsigned char _end[1];
+};
+
+struct zip64_dir_trailer_locator {
+	unsigned char magic[4];
+	unsigned char disk[4];
+	unsigned char offset[8];
+	unsigned char number_of_disks[4];
+	unsigned char _end[1];
+};
+
+/*
+ * On ARM, padding is added at the end of the struct, so a simple
+ * sizeof(struct ...) reports two bytes more than the payload size
+ * we're interested in.
+ */
+#define ZIP_LOCAL_HEADER_SIZE	offsetof(struct zip_local_header, _end)
+#define ZIP_DATA_DESC_SIZE	offsetof(struct zip_data_desc, _end)
+#define ZIP64_DATA_DESC_SIZE	offsetof(struct zip64_data_desc, _end)
+#define ZIP_DIR_HEADER_SIZE	offsetof(struct zip_dir_header, _end)
+#define ZIP_DIR_TRAILER_SIZE	offsetof(struct zip_dir_trailer, _end)
+#define ZIP_EXTRA_MTIME_SIZE	offsetof(struct zip_extra_mtime, _end)
+#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
+	(ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
+#define ZIP64_EXTRA_SIZE	offsetof(struct zip64_extra, _end)
+#define ZIP64_EXTRA_PAYLOAD_SIZE \
+	(ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
+#define ZIP64_DIR_TRAILER_SIZE	offsetof(struct zip64_dir_trailer, _end)
+#define ZIP64_DIR_TRAILER_RECORD_SIZE \
+	(ZIP64_DIR_TRAILER_SIZE - \
+	 offsetof(struct zip64_dir_trailer, creator_version))
+#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
+	offsetof(struct zip64_dir_trailer_locator, _end)
+
+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 copy_le64(unsigned char *dest, uint64_t n)
+{
+	dest[0] = 0xff & n;
+	dest[1] = 0xff & (n >> 010);
+	dest[2] = 0xff & (n >> 020);
+	dest[3] = 0xff & (n >> 030);
+	dest[4] = 0xff & (n >> 040);
+	dest[5] = 0xff & (n >> 050);
+	dest[6] = 0xff & (n >> 060);
+	dest[7] = 0xff & (n >> 070);
+}
+
+static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
+{
+	if (n <= max)
+		return n;
+	*clamped = 1;
+	return max;
+}
+
+static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
+{
+	copy_le16(dest, clamp_max(n, 0xffff, clamped));
+}
+
+static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
+{
+	copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
+}
+
+static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
+{
+	while (size-- > 0) {
+		strbuf_addch(sb, n & 0xff);
+		n >>= 8;
+	}
+	return -!!n;
+}
+
+static uint32_t clamp32(uintmax_t n)
+{
+	const uintmax_t max = 0xffffffff;
+	return (n < max) ? n : max;
+}
+
+static void *zlib_deflate_raw(void *data, unsigned long size,
+			      int compression_level,
+			      unsigned long *compressed_size)
+{
+	git_zstream stream;
+	unsigned long maxsize;
+	void *buffer;
+	int result;
+
+	git_deflate_init_raw(&stream, compression_level);
+	maxsize = git_deflate_bound(&stream, size);
+	buffer = xmalloc(maxsize);
+
+	stream.next_in = data;
+	stream.avail_in = size;
+	stream.next_out = buffer;
+	stream.avail_out = maxsize;
+
+	do {
+		result = git_deflate(&stream, Z_FINISH);
+	} while (result == Z_OK);
+
+	if (result != Z_STREAM_END) {
+		free(buffer);
+		return NULL;
+	}
+
+	git_deflate_end(&stream);
+	*compressed_size = stream.total_out;
+
+	return buffer;
+}
+
+static void write_zip_data_desc(unsigned long size,
+				unsigned long compressed_size,
+				unsigned long crc)
+{
+	if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
+		struct zip64_data_desc trailer;
+		copy_le32(trailer.magic, 0x08074b50);
+		copy_le32(trailer.crc32, crc);
+		copy_le64(trailer.compressed_size, compressed_size);
+		copy_le64(trailer.size, size);
+		write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
+		zip_offset += ZIP64_DATA_DESC_SIZE;
+	} else {
+		struct zip_data_desc trailer;
+		copy_le32(trailer.magic, 0x08074b50);
+		copy_le32(trailer.crc32, crc);
+		copy_le32(trailer.compressed_size, compressed_size);
+		copy_le32(trailer.size, size);
+		write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
+		zip_offset += ZIP_DATA_DESC_SIZE;
+	}
+}
+
+static void set_zip_header_data_desc(struct zip_local_header *header,
+				     unsigned long size,
+				     unsigned long compressed_size,
+				     unsigned long crc)
+{
+	copy_le32(header->crc32, crc);
+	copy_le32(header->compressed_size, compressed_size);
+	copy_le32(header->size, size);
+}
+
+static int has_only_ascii(const char *s)
+{
+	for (;;) {
+		int c = *s++;
+		if (c == '\0')
+			return 1;
+		if (!isascii(c))
+			return 0;
+	}
+}
+
+static int entry_is_binary(struct index_state *istate, const char *path,
+			   const void *buffer, size_t size)
+{
+	struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
+	if (!driver)
+		driver = userdiff_find_by_name("default");
+	if (driver->binary != -1)
+		return driver->binary;
+	return buffer_is_binary(buffer, size);
+}
+
+#define STREAM_BUFFER_SIZE (1024 * 16)
+
+static int write_zip_entry(struct archiver_args *args,
+			   const struct object_id *oid,
+			   const char *path, size_t pathlen,
+			   unsigned int mode)
+{
+	struct zip_local_header header;
+	uintmax_t offset = zip_offset;
+	struct zip_extra_mtime extra;
+	struct zip64_extra extra64;
+	size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
+	int need_zip64_extra = 0;
+	unsigned long attr2;
+	unsigned long compressed_size;
+	unsigned long crc;
+	int method;
+	unsigned char *out;
+	void *deflated = NULL;
+	void *buffer;
+	struct git_istream *stream = NULL;
+	unsigned long flags = 0;
+	unsigned long size;
+	int is_binary = -1;
+	const char *path_without_prefix = path + args->baselen;
+	unsigned int creator_version = 0;
+	unsigned int version_needed = 10;
+	size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
+	size_t zip64_dir_extra_payload_size = 0;
+
+	crc = crc32(0, NULL, 0);
+
+	if (!has_only_ascii(path)) {
+		if (is_utf8(path))
+			flags |= ZIP_UTF8;
+		else
+			warning(_("path is not valid UTF-8: %s"), path);
+	}
+
+	if (pathlen > 0xffff) {
+		return error(_("path too long (%d chars, SHA1: %s): %s"),
+				(int)pathlen, oid_to_hex(oid), path);
+	}
+
+	if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
+		method = 0;
+		attr2 = 16;
+		out = NULL;
+		size = 0;
+		compressed_size = 0;
+		buffer = NULL;
+	} else if (S_ISREG(mode) || S_ISLNK(mode)) {
+		enum object_type type = oid_object_info(args->repo, oid,
+							&size);
+
+		method = 0;
+		attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
+			(mode & 0111) ? ((mode) << 16) : 0;
+		if (S_ISLNK(mode) || (mode & 0111))
+			creator_version = 0x0317;
+		if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
+			method = 8;
+
+		if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
+		    size > big_file_threshold) {
+			stream = open_istream(oid, &type, &size, NULL);
+			if (!stream)
+				return error(_("cannot stream blob %s"),
+					     oid_to_hex(oid));
+			flags |= ZIP_STREAM;
+			out = buffer = NULL;
+		} else {
+			buffer = object_file_to_archive(args, path, oid, mode,
+							&type, &size);
+			if (!buffer)
+				return error(_("cannot read %s"),
+					     oid_to_hex(oid));
+			crc = crc32(crc, buffer, size);
+			is_binary = entry_is_binary(args->repo->index,
+						    path_without_prefix,
+						    buffer, size);
+			out = buffer;
+		}
+		compressed_size = (method == 0) ? size : 0;
+	} else {
+		return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
+				oid_to_hex(oid));
+	}
+
+	if (creator_version > max_creator_version)
+		max_creator_version = creator_version;
+
+	if (buffer && method == 8) {
+		out = deflated = zlib_deflate_raw(buffer, size,
+						  args->compression_level,
+						  &compressed_size);
+		if (!out || compressed_size >= size) {
+			out = buffer;
+			method = 0;
+			compressed_size = size;
+		}
+	}
+
+	copy_le16(extra.magic, 0x5455);
+	copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
+	extra.flags[0] = 1;	/* just mtime */
+	copy_le32(extra.mtime, args->time);
+
+	if (size > 0xffffffff || compressed_size > 0xffffffff)
+		need_zip64_extra = 1;
+	if (stream && size > 0x7fffffff)
+		need_zip64_extra = 1;
+
+	if (need_zip64_extra)
+		version_needed = 45;
+
+	copy_le32(header.magic, 0x04034b50);
+	copy_le16(header.version, version_needed);
+	copy_le16(header.flags, flags);
+	copy_le16(header.compression_method, method);
+	copy_le16(header.mtime, zip_time);
+	copy_le16(header.mdate, zip_date);
+	if (need_zip64_extra) {
+		set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
+		header_extra_size += ZIP64_EXTRA_SIZE;
+	} else {
+		set_zip_header_data_desc(&header, size, compressed_size, crc);
+	}
+	copy_le16(header.filename_length, pathlen);
+	copy_le16(header.extra_length, header_extra_size);
+	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
+	zip_offset += ZIP_LOCAL_HEADER_SIZE;
+	write_or_die(1, path, pathlen);
+	zip_offset += pathlen;
+	write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
+	zip_offset += ZIP_EXTRA_MTIME_SIZE;
+	if (need_zip64_extra) {
+		copy_le16(extra64.magic, 0x0001);
+		copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
+		copy_le64(extra64.size, size);
+		copy_le64(extra64.compressed_size, compressed_size);
+		write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
+		zip_offset += ZIP64_EXTRA_SIZE;
+	}
+
+	if (stream && method == 0) {
+		unsigned char buf[STREAM_BUFFER_SIZE];
+		ssize_t readlen;
+
+		for (;;) {
+			readlen = read_istream(stream, buf, sizeof(buf));
+			if (readlen <= 0)
+				break;
+			crc = crc32(crc, buf, readlen);
+			if (is_binary == -1)
+				is_binary = entry_is_binary(args->repo->index,
+							    path_without_prefix,
+							    buf, readlen);
+			write_or_die(1, buf, readlen);
+		}
+		close_istream(stream);
+		if (readlen)
+			return readlen;
+
+		compressed_size = size;
+		zip_offset += compressed_size;
+
+		write_zip_data_desc(size, compressed_size, crc);
+	} else if (stream && method == 8) {
+		unsigned char buf[STREAM_BUFFER_SIZE];
+		ssize_t readlen;
+		git_zstream zstream;
+		int result;
+		size_t out_len;
+		unsigned char compressed[STREAM_BUFFER_SIZE * 2];
+
+		git_deflate_init_raw(&zstream, args->compression_level);
+
+		compressed_size = 0;
+		zstream.next_out = compressed;
+		zstream.avail_out = sizeof(compressed);
+
+		for (;;) {
+			readlen = read_istream(stream, buf, sizeof(buf));
+			if (readlen <= 0)
+				break;
+			crc = crc32(crc, buf, readlen);
+			if (is_binary == -1)
+				is_binary = entry_is_binary(args->repo->index,
+							    path_without_prefix,
+							    buf, readlen);
+
+			zstream.next_in = buf;
+			zstream.avail_in = readlen;
+			result = git_deflate(&zstream, 0);
+			if (result != Z_OK)
+				die(_("deflate error (%d)"), result);
+			out_len = zstream.next_out - compressed;
+
+			if (out_len > 0) {
+				write_or_die(1, compressed, out_len);
+				compressed_size += out_len;
+				zstream.next_out = compressed;
+				zstream.avail_out = sizeof(compressed);
+			}
+
+		}
+		close_istream(stream);
+		if (readlen)
+			return readlen;
+
+		zstream.next_in = buf;
+		zstream.avail_in = 0;
+		result = git_deflate(&zstream, Z_FINISH);
+		if (result != Z_STREAM_END)
+			die("deflate error (%d)", result);
+
+		git_deflate_end(&zstream);
+		out_len = zstream.next_out - compressed;
+		write_or_die(1, compressed, out_len);
+		compressed_size += out_len;
+		zip_offset += compressed_size;
+
+		write_zip_data_desc(size, compressed_size, crc);
+	} else if (compressed_size > 0) {
+		write_or_die(1, out, compressed_size);
+		zip_offset += compressed_size;
+	}
+
+	free(deflated);
+	free(buffer);
+
+	if (compressed_size > 0xffffffff || size > 0xffffffff ||
+	    offset > 0xffffffff) {
+		if (compressed_size >= 0xffffffff)
+			zip64_dir_extra_payload_size += 8;
+		if (size >= 0xffffffff)
+			zip64_dir_extra_payload_size += 8;
+		if (offset >= 0xffffffff)
+			zip64_dir_extra_payload_size += 8;
+		zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
+	}
+
+	strbuf_add_le(&zip_dir, 4, 0x02014b50);	/* magic */
+	strbuf_add_le(&zip_dir, 2, creator_version);
+	strbuf_add_le(&zip_dir, 2, version_needed);
+	strbuf_add_le(&zip_dir, 2, flags);
+	strbuf_add_le(&zip_dir, 2, method);
+	strbuf_add_le(&zip_dir, 2, zip_time);
+	strbuf_add_le(&zip_dir, 2, zip_date);
+	strbuf_add_le(&zip_dir, 4, crc);
+	strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
+	strbuf_add_le(&zip_dir, 4, clamp32(size));
+	strbuf_add_le(&zip_dir, 2, pathlen);
+	strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
+	strbuf_add_le(&zip_dir, 2, 0);		/* comment length */
+	strbuf_add_le(&zip_dir, 2, 0);		/* disk */
+	strbuf_add_le(&zip_dir, 2, !is_binary);
+	strbuf_add_le(&zip_dir, 4, attr2);
+	strbuf_add_le(&zip_dir, 4, clamp32(offset));
+	strbuf_add(&zip_dir, path, pathlen);
+	strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
+	if (zip64_dir_extra_payload_size) {
+		strbuf_add_le(&zip_dir, 2, 0x0001);	/* magic */
+		strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
+		if (size >= 0xffffffff)
+			strbuf_add_le(&zip_dir, 8, size);
+		if (compressed_size >= 0xffffffff)
+			strbuf_add_le(&zip_dir, 8, compressed_size);
+		if (offset >= 0xffffffff)
+			strbuf_add_le(&zip_dir, 8, offset);
+	}
+	zip_dir_entries++;
+
+	return 0;
+}
+
+static void write_zip64_trailer(void)
+{
+	struct zip64_dir_trailer trailer64;
+	struct zip64_dir_trailer_locator locator64;
+
+	copy_le32(trailer64.magic, 0x06064b50);
+	copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
+	copy_le16(trailer64.creator_version, max_creator_version);
+	copy_le16(trailer64.version, 45);
+	copy_le32(trailer64.disk, 0);
+	copy_le32(trailer64.directory_start_disk, 0);
+	copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
+	copy_le64(trailer64.entries, zip_dir_entries);
+	copy_le64(trailer64.size, zip_dir.len);
+	copy_le64(trailer64.offset, zip_offset);
+
+	copy_le32(locator64.magic, 0x07064b50);
+	copy_le32(locator64.disk, 0);
+	copy_le64(locator64.offset, zip_offset + zip_dir.len);
+	copy_le32(locator64.number_of_disks, 1);
+
+	write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
+	write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
+}
+
+static void write_zip_trailer(const struct object_id *oid)
+{
+	struct zip_dir_trailer trailer;
+	int clamped = 0;
+
+	copy_le32(trailer.magic, 0x06054b50);
+	copy_le16(trailer.disk, 0);
+	copy_le16(trailer.directory_start_disk, 0);
+	copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
+			&clamped);
+	copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
+	copy_le32(trailer.size, zip_dir.len);
+	copy_le32_clamp(trailer.offset, zip_offset, &clamped);
+	copy_le16(trailer.comment_length, oid ? the_hash_algo->hexsz : 0);
+
+	write_or_die(1, zip_dir.buf, zip_dir.len);
+	if (clamped)
+		write_zip64_trailer();
+	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
+	if (oid)
+		write_or_die(1, oid_to_hex(oid), the_hash_algo->hexsz);
+}
+
+static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
+{
+	time_t time;
+	struct tm *t;
+
+	if (date_overflows(*timestamp))
+		die(_("timestamp too large for this system: %"PRItime),
+		    *timestamp);
+	time = (time_t)*timestamp;
+	t = localtime(&time);
+	*timestamp = 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;
+}
+
+static int archive_zip_config(const char *var, const char *value, void *data)
+{
+	return userdiff_config(var, value);
+}
+
+static int write_zip_archive(const struct archiver *ar,
+			     struct archiver_args *args)
+{
+	int err;
+
+	git_config(archive_zip_config, NULL);
+
+	dos_time(&args->time, &zip_date, &zip_time);
+
+	strbuf_init(&zip_dir, 0);
+
+	err = write_archive_entries(args, write_zip_entry);
+	if (!err)
+		write_zip_trailer(args->commit_oid);
+
+	strbuf_release(&zip_dir);
+
+	return err;
+}
+
+static struct archiver zip_archiver = {
+	"zip",
+	write_zip_archive,
+	ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
+};
+
+void init_zip_archiver(void)
+{
+	register_archiver(&zip_archiver);
+}