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https://github.com/git/git.git
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9befac470b
Like xmalloc and xrealloc xstrdup dies with a useful message if the native strdup() implementation returns NULL rather than a valid pointer. I just tried to use xstrdup in new code and found it to be missing. However I expected it to be present as xmalloc and xrealloc are already commonly used throughout the code. [jc: removed the part that deals with last_XXX, which I am finding more and more dubious these days.] Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
354 lines
8.6 KiB
C
354 lines
8.6 KiB
C
/*
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* Copyright (c) 2006 Rene Scharfe
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*/
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#include <time.h>
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#include "cache.h"
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#include "commit.h"
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#include "blob.h"
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#include "tree.h"
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#include "quote.h"
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#include "builtin.h"
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static const char zip_tree_usage[] =
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"git-zip-tree [-0|...|-9] <tree-ish> [ <base> ]";
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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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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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};
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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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};
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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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};
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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(void *data, unsigned long size,
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unsigned long *compressed_size)
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{
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z_stream stream;
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unsigned long maxsize;
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void *buffer;
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int result;
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memset(&stream, 0, sizeof(stream));
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deflateInit(&stream, zlib_compression_level);
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maxsize = deflateBound(&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 = 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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deflateEnd(&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 char *construct_path(const char *base, int baselen,
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const char *filename, int isdir, int *pathlen)
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{
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int filenamelen = strlen(filename);
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int len = baselen + filenamelen;
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char *path, *p;
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if (isdir)
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len++;
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p = path = xmalloc(len + 1);
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memcpy(p, base, baselen);
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p += baselen;
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memcpy(p, filename, filenamelen);
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p += filenamelen;
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if (isdir)
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*p++ = '/';
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*p = '\0';
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*pathlen = len;
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return path;
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}
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static int write_zip_entry(const unsigned char *sha1,
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const char *base, int baselen,
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const char *filename, unsigned mode, int stage)
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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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unsigned long compressed_size;
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unsigned long uncompressed_size;
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unsigned long crc;
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unsigned long direntsize;
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unsigned long size;
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int method;
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int result = -1;
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int pathlen;
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unsigned char *out;
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char *path;
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char type[20];
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void *buffer = NULL;
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void *deflated = NULL;
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crc = crc32(0, Z_NULL, 0);
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path = construct_path(base, baselen, filename, S_ISDIR(mode), &pathlen);
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if (pathlen > 0xffff) {
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error("path too long (%d chars, SHA1: %s): %s", pathlen,
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sha1_to_hex(sha1), path);
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goto out;
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}
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if (S_ISDIR(mode)) {
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method = 0;
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result = READ_TREE_RECURSIVE;
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out = NULL;
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uncompressed_size = 0;
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compressed_size = 0;
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} else if (S_ISREG(mode)) {
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method = zlib_compression_level == 0 ? 0 : 8;
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result = 0;
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buffer = read_sha1_file(sha1, type, &size);
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if (!buffer)
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die("cannot read %s", sha1_to_hex(sha1));
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crc = crc32(crc, buffer, size);
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out = buffer;
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uncompressed_size = size;
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compressed_size = size;
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} else {
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error("unsupported file mode: 0%o (SHA1: %s)", mode,
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sha1_to_hex(sha1));
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goto out;
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}
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if (method == 8) {
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deflated = zlib_deflate(buffer, size, &compressed_size);
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if (deflated && compressed_size - 6 < size) {
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/* ZLIB --> raw compressed data (see RFC 1950) */
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/* CMF and FLG ... */
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out = (unsigned char *)deflated + 2;
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compressed_size -= 6; /* ... and ADLER32 */
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} else {
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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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/* make sure we have enough free space in the dictionary */
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direntsize = sizeof(struct zip_dir_header) + pathlen;
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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, 0);
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copy_le16(dirent.version, 20);
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copy_le16(dirent.flags, 0);
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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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copy_le32(dirent.crc32, crc);
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copy_le32(dirent.compressed_size, compressed_size);
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copy_le32(dirent.size, uncompressed_size);
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copy_le16(dirent.filename_length, pathlen);
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copy_le16(dirent.extra_length, 0);
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copy_le16(dirent.comment_length, 0);
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copy_le16(dirent.disk, 0);
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copy_le16(dirent.attr1, 0);
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copy_le32(dirent.attr2, 0);
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copy_le32(dirent.offset, zip_offset);
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memcpy(zip_dir + zip_dir_offset, &dirent, sizeof(struct zip_dir_header));
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zip_dir_offset += sizeof(struct zip_dir_header);
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memcpy(zip_dir + zip_dir_offset, path, pathlen);
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zip_dir_offset += pathlen;
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zip_dir_entries++;
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copy_le32(header.magic, 0x04034b50);
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copy_le16(header.version, 20);
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copy_le16(header.flags, 0);
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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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copy_le32(header.crc32, crc);
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copy_le32(header.compressed_size, compressed_size);
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copy_le32(header.size, uncompressed_size);
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copy_le16(header.filename_length, pathlen);
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copy_le16(header.extra_length, 0);
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write_or_die(1, &header, sizeof(struct zip_local_header));
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zip_offset += sizeof(struct zip_local_header);
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write_or_die(1, path, pathlen);
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zip_offset += pathlen;
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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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out:
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free(buffer);
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free(deflated);
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free(path);
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return result;
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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, sizeof(struct zip_dir_trailer));
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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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int cmd_zip_tree(int argc, const char **argv, const char *prefix)
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{
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unsigned char sha1[20];
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struct tree *tree;
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struct commit *commit;
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time_t archive_time;
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char *base;
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int baselen;
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git_config(git_default_config);
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if (argc > 1 && argv[1][0] == '-') {
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if (isdigit(argv[1][1]) && argv[1][2] == '\0') {
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zlib_compression_level = argv[1][1] - '0';
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argc--;
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argv++;
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}
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}
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switch (argc) {
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case 3:
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base = xstrdup(argv[2]);
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baselen = strlen(base);
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break;
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case 2:
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base = xstrdup("");
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baselen = 0;
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break;
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default:
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usage(zip_tree_usage);
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}
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if (get_sha1(argv[1], sha1))
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die("Not a valid object name %s", argv[1]);
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commit = lookup_commit_reference_gently(sha1, 1);
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archive_time = commit ? commit->date : time(NULL);
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dos_time(&archive_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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tree = parse_tree_indirect(sha1);
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if (!tree)
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die("not a tree object");
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if (baselen > 0) {
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write_zip_entry(tree->object.sha1, "", 0, base, 040777, 0);
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base = xrealloc(base, baselen + 1);
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base[baselen] = '/';
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baselen++;
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base[baselen] = '\0';
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}
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read_tree_recursive(tree, base, baselen, 0, NULL, write_zip_entry);
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write_zip_trailer(commit ? commit->object.sha1 : NULL);
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free(zip_dir);
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free(base);
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return 0;
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}
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