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![Junio C Hamano](/assets/img/avatar_default.png)
"git archive" can now be told to set the 'text' attribute in the resulting zip archive. * rs/zip-text: archive-zip: mark text files in archives
497 lines
13 KiB
C
497 lines
13 KiB
C
/*
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* Copyright (c) 2006 Rene Scharfe
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*/
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#include "cache.h"
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#include "archive.h"
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#include "streaming.h"
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#include "utf8.h"
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#include "userdiff.h"
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#include "xdiff-interface.h"
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static int zip_date;
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static int zip_time;
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static unsigned char *zip_dir;
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static unsigned int zip_dir_size;
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static unsigned int zip_offset;
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static unsigned int zip_dir_offset;
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static unsigned int zip_dir_entries;
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#define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
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#define ZIP_STREAM (1 << 3)
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#define ZIP_UTF8 (1 << 11)
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struct zip_local_header {
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unsigned char magic[4];
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unsigned char version[2];
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unsigned char flags[2];
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unsigned char compression_method[2];
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unsigned char mtime[2];
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unsigned char mdate[2];
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unsigned char crc32[4];
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unsigned char compressed_size[4];
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unsigned char size[4];
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unsigned char filename_length[2];
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unsigned char extra_length[2];
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unsigned char _end[1];
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};
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struct zip_data_desc {
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unsigned char magic[4];
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unsigned char crc32[4];
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unsigned char compressed_size[4];
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unsigned char size[4];
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unsigned char _end[1];
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};
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struct zip_dir_header {
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unsigned char magic[4];
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unsigned char creator_version[2];
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unsigned char version[2];
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unsigned char flags[2];
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unsigned char compression_method[2];
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unsigned char mtime[2];
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unsigned char mdate[2];
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unsigned char crc32[4];
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unsigned char compressed_size[4];
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unsigned char size[4];
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unsigned char filename_length[2];
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unsigned char extra_length[2];
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unsigned char comment_length[2];
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unsigned char disk[2];
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unsigned char attr1[2];
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unsigned char attr2[4];
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unsigned char offset[4];
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unsigned char _end[1];
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};
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struct zip_dir_trailer {
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unsigned char magic[4];
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unsigned char disk[2];
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unsigned char directory_start_disk[2];
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unsigned char entries_on_this_disk[2];
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unsigned char entries[2];
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unsigned char size[4];
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unsigned char offset[4];
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unsigned char comment_length[2];
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unsigned char _end[1];
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};
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struct zip_extra_mtime {
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unsigned char magic[2];
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unsigned char extra_size[2];
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unsigned char flags[1];
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unsigned char mtime[4];
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unsigned char _end[1];
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};
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/*
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* On ARM, padding is added at the end of the struct, so a simple
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* sizeof(struct ...) reports two bytes more than the payload size
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* we're interested in.
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*/
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#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
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#define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
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#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
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#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
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#define ZIP_EXTRA_MTIME_SIZE offsetof(struct zip_extra_mtime, _end)
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#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
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(ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
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static void copy_le16(unsigned char *dest, unsigned int n)
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{
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dest[0] = 0xff & n;
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dest[1] = 0xff & (n >> 010);
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}
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static void copy_le32(unsigned char *dest, unsigned int n)
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{
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dest[0] = 0xff & n;
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dest[1] = 0xff & (n >> 010);
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dest[2] = 0xff & (n >> 020);
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dest[3] = 0xff & (n >> 030);
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}
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static void *zlib_deflate_raw(void *data, unsigned long size,
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int compression_level,
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unsigned long *compressed_size)
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{
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git_zstream stream;
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unsigned long maxsize;
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void *buffer;
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int result;
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git_deflate_init_raw(&stream, compression_level);
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maxsize = git_deflate_bound(&stream, size);
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buffer = xmalloc(maxsize);
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stream.next_in = data;
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stream.avail_in = size;
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stream.next_out = buffer;
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stream.avail_out = maxsize;
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do {
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result = git_deflate(&stream, Z_FINISH);
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} while (result == Z_OK);
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if (result != Z_STREAM_END) {
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free(buffer);
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return NULL;
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}
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git_deflate_end(&stream);
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*compressed_size = stream.total_out;
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return buffer;
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}
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static void write_zip_data_desc(unsigned long size,
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unsigned long compressed_size,
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unsigned long crc)
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{
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struct zip_data_desc trailer;
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copy_le32(trailer.magic, 0x08074b50);
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copy_le32(trailer.crc32, crc);
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copy_le32(trailer.compressed_size, compressed_size);
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copy_le32(trailer.size, size);
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write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
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}
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static void set_zip_dir_data_desc(struct zip_dir_header *header,
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unsigned long size,
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unsigned long compressed_size,
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unsigned long crc)
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{
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copy_le32(header->crc32, crc);
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copy_le32(header->compressed_size, compressed_size);
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copy_le32(header->size, size);
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}
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static void set_zip_header_data_desc(struct zip_local_header *header,
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unsigned long size,
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unsigned long compressed_size,
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unsigned long crc)
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{
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copy_le32(header->crc32, crc);
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copy_le32(header->compressed_size, compressed_size);
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copy_le32(header->size, size);
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}
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static int has_only_ascii(const char *s)
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{
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for (;;) {
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int c = *s++;
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if (c == '\0')
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return 1;
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if (!isascii(c))
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return 0;
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}
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}
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static int entry_is_binary(const char *path, const void *buffer, size_t size)
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{
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struct userdiff_driver *driver = userdiff_find_by_path(path);
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if (!driver)
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driver = userdiff_find_by_name("default");
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if (driver->binary != -1)
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return driver->binary;
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return buffer_is_binary(buffer, size);
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}
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#define STREAM_BUFFER_SIZE (1024 * 16)
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static int write_zip_entry(struct archiver_args *args,
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const unsigned char *sha1,
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const char *path, size_t pathlen,
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unsigned int mode)
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{
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struct zip_local_header header;
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struct zip_dir_header dirent;
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struct zip_extra_mtime extra;
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unsigned long attr2;
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unsigned long compressed_size;
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unsigned long crc;
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unsigned long direntsize;
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int method;
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unsigned char *out;
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void *deflated = NULL;
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void *buffer;
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struct git_istream *stream = NULL;
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unsigned long flags = 0;
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unsigned long size;
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int is_binary = -1;
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const char *path_without_prefix = path + args->baselen;
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crc = crc32(0, NULL, 0);
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if (!has_only_ascii(path)) {
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if (is_utf8(path))
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flags |= ZIP_UTF8;
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else
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warning("Path is not valid UTF-8: %s", path);
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}
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if (pathlen > 0xffff) {
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return error("path too long (%d chars, SHA1: %s): %s",
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(int)pathlen, sha1_to_hex(sha1), path);
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}
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if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
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method = 0;
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attr2 = 16;
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out = NULL;
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size = 0;
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compressed_size = 0;
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buffer = NULL;
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} else if (S_ISREG(mode) || S_ISLNK(mode)) {
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enum object_type type = sha1_object_info(sha1, &size);
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method = 0;
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attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
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(mode & 0111) ? ((mode) << 16) : 0;
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if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
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method = 8;
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if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
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size > big_file_threshold) {
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stream = open_istream(sha1, &type, &size, NULL);
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if (!stream)
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return error("cannot stream blob %s",
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sha1_to_hex(sha1));
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flags |= ZIP_STREAM;
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out = buffer = NULL;
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} else {
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buffer = sha1_file_to_archive(args, path, sha1, mode,
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&type, &size);
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if (!buffer)
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return error("cannot read %s",
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sha1_to_hex(sha1));
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crc = crc32(crc, buffer, size);
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is_binary = entry_is_binary(path_without_prefix,
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buffer, size);
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out = buffer;
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}
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compressed_size = (method == 0) ? size : 0;
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} else {
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return error("unsupported file mode: 0%o (SHA1: %s)", mode,
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sha1_to_hex(sha1));
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}
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if (buffer && method == 8) {
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out = deflated = zlib_deflate_raw(buffer, size,
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args->compression_level,
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&compressed_size);
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if (!out || compressed_size >= size) {
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out = buffer;
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method = 0;
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compressed_size = size;
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}
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}
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copy_le16(extra.magic, 0x5455);
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copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
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extra.flags[0] = 1; /* just mtime */
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copy_le32(extra.mtime, args->time);
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/* make sure we have enough free space in the dictionary */
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direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
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while (zip_dir_size < zip_dir_offset + direntsize) {
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zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
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zip_dir = xrealloc(zip_dir, zip_dir_size);
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}
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copy_le32(dirent.magic, 0x02014b50);
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copy_le16(dirent.creator_version,
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S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
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copy_le16(dirent.version, 10);
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copy_le16(dirent.flags, flags);
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copy_le16(dirent.compression_method, method);
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copy_le16(dirent.mtime, zip_time);
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copy_le16(dirent.mdate, zip_date);
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set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
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copy_le16(dirent.filename_length, pathlen);
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copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
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copy_le16(dirent.comment_length, 0);
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copy_le16(dirent.disk, 0);
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copy_le32(dirent.attr2, attr2);
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copy_le32(dirent.offset, zip_offset);
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copy_le32(header.magic, 0x04034b50);
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copy_le16(header.version, 10);
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copy_le16(header.flags, flags);
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copy_le16(header.compression_method, method);
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copy_le16(header.mtime, zip_time);
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copy_le16(header.mdate, zip_date);
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set_zip_header_data_desc(&header, size, compressed_size, crc);
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copy_le16(header.filename_length, pathlen);
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copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
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write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
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zip_offset += ZIP_LOCAL_HEADER_SIZE;
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write_or_die(1, path, pathlen);
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zip_offset += pathlen;
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write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
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zip_offset += ZIP_EXTRA_MTIME_SIZE;
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if (stream && method == 0) {
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unsigned char buf[STREAM_BUFFER_SIZE];
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ssize_t readlen;
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for (;;) {
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readlen = read_istream(stream, buf, sizeof(buf));
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if (readlen <= 0)
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break;
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crc = crc32(crc, buf, readlen);
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if (is_binary == -1)
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is_binary = entry_is_binary(path_without_prefix,
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buf, readlen);
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write_or_die(1, buf, readlen);
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}
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close_istream(stream);
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if (readlen)
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return readlen;
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compressed_size = size;
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zip_offset += compressed_size;
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write_zip_data_desc(size, compressed_size, crc);
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zip_offset += ZIP_DATA_DESC_SIZE;
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set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
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} else if (stream && method == 8) {
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unsigned char buf[STREAM_BUFFER_SIZE];
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ssize_t readlen;
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git_zstream zstream;
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int result;
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size_t out_len;
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unsigned char compressed[STREAM_BUFFER_SIZE * 2];
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git_deflate_init_raw(&zstream, args->compression_level);
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compressed_size = 0;
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zstream.next_out = compressed;
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zstream.avail_out = sizeof(compressed);
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for (;;) {
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readlen = read_istream(stream, buf, sizeof(buf));
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if (readlen <= 0)
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break;
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crc = crc32(crc, buf, readlen);
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if (is_binary == -1)
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is_binary = entry_is_binary(path_without_prefix,
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buf, readlen);
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zstream.next_in = buf;
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zstream.avail_in = readlen;
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result = git_deflate(&zstream, 0);
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if (result != Z_OK)
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die("deflate error (%d)", result);
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out_len = zstream.next_out - compressed;
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if (out_len > 0) {
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write_or_die(1, compressed, out_len);
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compressed_size += out_len;
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zstream.next_out = compressed;
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zstream.avail_out = sizeof(compressed);
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}
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}
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close_istream(stream);
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if (readlen)
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return readlen;
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zstream.next_in = buf;
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zstream.avail_in = 0;
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result = git_deflate(&zstream, Z_FINISH);
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if (result != Z_STREAM_END)
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die("deflate error (%d)", result);
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git_deflate_end(&zstream);
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out_len = zstream.next_out - compressed;
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write_or_die(1, compressed, out_len);
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compressed_size += out_len;
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zip_offset += compressed_size;
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write_zip_data_desc(size, compressed_size, crc);
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zip_offset += ZIP_DATA_DESC_SIZE;
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set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
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} else if (compressed_size > 0) {
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write_or_die(1, out, compressed_size);
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zip_offset += compressed_size;
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}
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free(deflated);
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free(buffer);
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copy_le16(dirent.attr1, !is_binary);
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memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
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zip_dir_offset += ZIP_DIR_HEADER_SIZE;
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memcpy(zip_dir + zip_dir_offset, path, pathlen);
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zip_dir_offset += pathlen;
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memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
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zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
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zip_dir_entries++;
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return 0;
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}
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static void write_zip_trailer(const unsigned char *sha1)
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{
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struct zip_dir_trailer trailer;
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copy_le32(trailer.magic, 0x06054b50);
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copy_le16(trailer.disk, 0);
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copy_le16(trailer.directory_start_disk, 0);
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copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
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copy_le16(trailer.entries, zip_dir_entries);
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copy_le32(trailer.size, zip_dir_offset);
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copy_le32(trailer.offset, zip_offset);
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copy_le16(trailer.comment_length, sha1 ? 40 : 0);
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write_or_die(1, zip_dir, zip_dir_offset);
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write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
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if (sha1)
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write_or_die(1, sha1_to_hex(sha1), 40);
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}
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static void dos_time(time_t *time, int *dos_date, int *dos_time)
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{
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struct tm *t = localtime(time);
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*dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
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(t->tm_year + 1900 - 1980) * 512;
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*dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
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}
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static int write_zip_archive(const struct archiver *ar,
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struct archiver_args *args)
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{
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int err;
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dos_time(&args->time, &zip_date, &zip_time);
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zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
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zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
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err = write_archive_entries(args, write_zip_entry);
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if (!err)
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write_zip_trailer(args->commit_sha1);
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free(zip_dir);
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return err;
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}
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static struct archiver zip_archiver = {
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"zip",
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write_zip_archive,
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ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
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};
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void init_zip_archiver(void)
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{
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register_archiver(&zip_archiver);
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}
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