/* Compression detection */
enum compress_type {
- ct_tar, /* Plain tar file */
ct_none, /* Unknown compression type */
+ ct_tar, /* Plain tar file */
ct_compress,
ct_gzip,
ct_bzip2,
ct_xz
};
+static enum compress_type archive_compression_type = ct_none;
+
struct zip_magic
{
enum compress_type type;
size_t length;
char const *magic;
+};
+
+struct zip_program
+{
+ enum compress_type type;
char const *program;
char const *option;
};
static struct zip_magic const magic[] = {
- { ct_tar },
{ ct_none, },
- { ct_compress, 2, "\037\235", COMPRESS_PROGRAM, "-Z" },
- { ct_gzip, 2, "\037\213", GZIP_PROGRAM, "-z" },
- { ct_bzip2, 3, "BZh", BZIP2_PROGRAM, "-j" },
- { ct_lzip, 4, "LZIP", LZIP_PROGRAM, "--lzip" },
- { ct_lzma, 6, "\xFFLZMA", LZMA_PROGRAM, "--lzma" },
- { ct_lzop, 4, "\211LZO", LZOP_PROGRAM, "--lzop" },
- { ct_xz, 6, "\xFD" "7zXZ", XZ_PROGRAM, "-J" },
+ { ct_tar },
+ { ct_compress, 2, "\037\235" },
+ { ct_gzip, 2, "\037\213" },
+ { ct_bzip2, 3, "BZh" },
+ { ct_lzip, 4, "LZIP" },
+ { ct_lzma, 6, "\xFFLZMA" },
+ { ct_lzop, 4, "\211LZO" },
+ { ct_xz, 6, "\xFD" "7zXZ" },
};
#define NMAGIC (sizeof(magic)/sizeof(magic[0]))
-#define compress_option(t) magic[t].option
-#define compress_program(t) magic[t].program
+static struct zip_program zip_program[] = {
+ { ct_compress, COMPRESS_PROGRAM, "-Z" },
+ { ct_compress, GZIP_PROGRAM, "-z" },
+ { ct_gzip, GZIP_PROGRAM, "-z" },
+ { ct_bzip2, BZIP2_PROGRAM, "-j" },
+ { ct_bzip2, "lbzip2", "-j" },
+ { ct_lzip, LZIP_PROGRAM, "--lzip" },
+ { ct_lzma, LZMA_PROGRAM, "--lzma" },
+ { ct_lzma, XZ_PROGRAM, "-J" },
+ { ct_lzop, LZOP_PROGRAM, "--lzop" },
+ { ct_xz, XZ_PROGRAM, "-J" },
+ { ct_none }
+};
+
+static struct zip_program const *
+find_zip_program (enum compress_type type, int *pstate)
+{
+ int i;
+
+ for (i = *pstate; zip_program[i].type != ct_none; i++)
+ {
+ if (zip_program[i].type == type)
+ {
+ *pstate = i + 1;
+ return zip_program + i;
+ }
+ }
+ *pstate = i;
+ return NULL;
+}
+
+const char *
+first_decompress_program (int *pstate)
+{
+ struct zip_program const *zp;
+
+ if (use_compress_program_option)
+ return use_compress_program_option;
+
+ if (archive_compression_type == ct_none)
+ return NULL;
+
+ *pstate = 0;
+ zp = find_zip_program (archive_compression_type, pstate);
+ return zp ? zp->program : NULL;
+}
+
+const char *
+next_decompress_program (int *pstate)
+{
+ struct zip_program const *zp;
+
+ if (use_compress_program_option)
+ return NULL;
+ zp = find_zip_program (archive_compression_type, pstate);
+ return zp ? zp->program : NULL;
+}
+
+static const char *
+compress_option (enum compress_type type)
+{
+ struct zip_program const *zp;
+ int i = 0;
+ zp = find_zip_program (type, &i);
+ return zp ? zp->option : NULL;
+}
/* Check if the file ARCHIVE is a compressed archive. */
static enum compress_type
break;
default:
- use_compress_program_option = compress_program (type);
+ archive_compression_type = type;
break;
}
}