/* Handle a .class file embedded in a .zip archive. This extracts a member from a .zip file, but does not handle uncompression (since that is not needed for classes.zip). Copyright (C) 1996, 97-98, 1999 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU CC; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Java and all Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. The Free Software Foundation is independent of Sun Microsystems, Inc. */ /* Written by Per Bothner , February 1996. */ #include "config.h" #include "system.h" #include "zipfile.h" /* This stuff is partly based on the 28 August 1994 public release of the Info-ZIP group's portable UnZip zipfile-extraction program (and related utilities). */ /*************/ /* Defines */ /*************/ #define UNZIP #define UNZIP_VERSION 20 /* compatible with PKUNZIP 2.0 */ #define VMS_UNZIP_VERSION 42 /* if OS-needed-to-extract is VMS: can do */ #define ZSUFX ".zip" #define CENTRAL_HDR_SIG "\113\001\002" /* the infamous "PK" signature */ #define LOCAL_HDR_SIG "\113\003\004" /* bytes, sans "P" (so unzip */ #define END_CENTRAL_SIG "\113\005\006" /* executable not mistaken for */ #define EXTD_LOCAL_SIG "\113\007\010" /* zipfile itself) */ #define STORED 0 /* compression methods */ #define SHRUNK 1 #define REDUCED1 2 #define REDUCED2 3 #define REDUCED3 4 #define REDUCED4 5 #define IMPLODED 6 #define TOKENIZED 7 #define DEFLATED 8 #define NUM_METHODS 9 /* index of last method + 1 */ /* don't forget to update list_files() appropriately if NUM_METHODS changes */ #define PK_OK 0 /* no error */ #define PK_COOL 0 /* no error */ #define PK_GNARLY 0 /* no error */ #define PK_WARN 1 /* warning error */ #define PK_ERR 2 /* error in zipfile */ #define PK_BADERR 3 /* severe error in zipfile */ #define PK_MEM 4 /* insufficient memory */ #define PK_MEM2 5 /* insufficient memory */ #define PK_MEM3 6 /* insufficient memory */ #define PK_MEM4 7 /* insufficient memory */ #define PK_MEM5 8 /* insufficient memory */ #define PK_NOZIP 9 /* zipfile not found */ #define PK_PARAM 10 /* bad or illegal parameters specified */ #define PK_FIND 11 /* no files found */ #define PK_DISK 50 /* disk full */ #define PK_EOF 51 /* unexpected EOF */ /*--------------------------------------------------------------------------- True sizes of the various headers, as defined by PKWARE--so it is not likely that these will ever change. But if they do, make sure both these defines AND the typedefs below get updated accordingly. ---------------------------------------------------------------------------*/ #define LREC_SIZE 26 /* lengths of local file headers, central */ #define CREC_SIZE 42 /* directory headers, and the end-of- */ #define ECREC_SIZE 18 /* central-dir record, respectively */ #ifndef SEEK_SET # define SEEK_SET 0 # define SEEK_CUR 1 # define SEEK_END 2 #endif /**************/ /* Typedefs */ /**************/ typedef char boolean; typedef unsigned char uch; /* code assumes unsigned bytes; these type- */ typedef unsigned short ush; /* defs replace byte/UWORD/ULONG (which are */ typedef unsigned long ulg; /* predefined on some systems) & match zip */ /*--------------------------------------------------------------------------- Zipfile layout declarations. If these headers ever change, make sure the xxREC_SIZE defines (above) change with them! ---------------------------------------------------------------------------*/ typedef uch local_byte_hdr[ LREC_SIZE ]; # define L_VERSION_NEEDED_TO_EXTRACT_0 0 # define L_VERSION_NEEDED_TO_EXTRACT_1 1 # define L_GENERAL_PURPOSE_BIT_FLAG 2 # define L_COMPRESSION_METHOD 4 # define L_LAST_MOD_FILE_TIME 6 # define L_LAST_MOD_FILE_DATE 8 # define L_CRC32 10 # define L_COMPRESSED_SIZE 14 # define L_UNCOMPRESSED_SIZE 18 # define L_FILENAME_LENGTH 22 # define L_EXTRA_FIELD_LENGTH 24 typedef uch cdir_byte_hdr[ CREC_SIZE ]; # define C_VERSION_MADE_BY_0 0 # define C_VERSION_MADE_BY_1 1 # define C_VERSION_NEEDED_TO_EXTRACT_0 2 # define C_VERSION_NEEDED_TO_EXTRACT_1 3 # define C_GENERAL_PURPOSE_BIT_FLAG 4 # define C_COMPRESSION_METHOD 6 # define C_LAST_MOD_FILE_TIME 8 # define C_LAST_MOD_FILE_DATE 10 # define C_CRC32 12 # define C_COMPRESSED_SIZE 16 # define C_UNCOMPRESSED_SIZE 20 # define C_FILENAME_LENGTH 24 # define C_EXTRA_FIELD_LENGTH 26 # define C_FILE_COMMENT_LENGTH 28 # define C_DISK_NUMBER_START 30 # define C_INTERNAL_FILE_ATTRIBUTES 32 # define C_EXTERNAL_FILE_ATTRIBUTES 34 # define C_RELATIVE_OFFSET_LOCAL_HEADER 38 typedef uch ec_byte_rec[ ECREC_SIZE+4 ]; /* define SIGNATURE 0 space-holder only */ # define NUMBER_THIS_DISK 4 # define NUM_DISK_WITH_START_CENTRAL_DIR 6 # define NUM_ENTRIES_CENTRL_DIR_THS_DISK 8 # define TOTAL_ENTRIES_CENTRAL_DIR 10 # define SIZE_CENTRAL_DIRECTORY 12 # define OFFSET_START_CENTRAL_DIRECTORY 16 # define ZIPFILE_COMMENT_LENGTH 20 typedef struct local_file_header { /* LOCAL */ uch version_needed_to_extract[2]; ush general_purpose_bit_flag; ush compression_method; ush last_mod_file_time; ush last_mod_file_date; ulg crc32; ulg csize; ulg ucsize; ush filename_length; ush extra_field_length; } local_file_hdr; typedef struct central_directory_file_header { /* CENTRAL */ uch version_made_by[2]; uch version_needed_to_extract[2]; ush general_purpose_bit_flag; ush compression_method; ush last_mod_file_time; ush last_mod_file_date; ulg crc32; ulg csize; ulg ucsize; ush filename_length; ush extra_field_length; ush file_comment_length; ush disk_number_start; ush internal_file_attributes; ulg external_file_attributes; ulg relative_offset_local_header; } cdir_file_hdr; typedef struct end_central_dir_record { /* END CENTRAL */ ush number_this_disk; ush num_disk_with_start_central_dir; ush num_entries_centrl_dir_ths_disk; ush total_entries_central_dir; ulg size_central_directory; ulg offset_start_central_directory; ush zipfile_comment_length; } ecdir_rec; /************/ /* Macros */ /************/ #ifndef MAX # define MAX(a,b) ((a) > (b) ? (a) : (b)) #endif #ifndef MIN # define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif /***********************/ /* Function makeword() */ /***********************/ static ush makeword(b) uch *b; { /* * Convert Intel style 'short' integer to non-Intel non-16-bit * host format. This routine also takes care of byte-ordering. */ return (ush)((b[1] << 8) | b[0]); } /***********************/ /* Function makelong() */ /***********************/ static ulg makelong(sig) uch *sig; { /* * Convert intel style 'long' variable to non-Intel non-16-bit * host format. This routine also takes care of byte-ordering. */ return (((ulg)sig[3]) << 24) + (((ulg)sig[2]) << 16) + (((ulg)sig[1]) << 8) + ((ulg)sig[0]); } int read_zip_archive (zipf) register ZipFile *zipf; { int i; int dir_last_pad; char *dir_ptr; char buffer[100]; zipf->size = lseek (zipf->fd, 0L, SEEK_END); if (zipf->size < (ECREC_SIZE+4) || lseek (zipf->fd, (long)(-(ECREC_SIZE+4)), SEEK_CUR) <= 0) return -1; if (read (zipf->fd, buffer, ECREC_SIZE+4) != ECREC_SIZE+4) return -2; zipf->count = makeword(&buffer[TOTAL_ENTRIES_CENTRAL_DIR]); zipf->dir_size = makelong(&buffer[SIZE_CENTRAL_DIRECTORY]); #define ALLOC malloc /* Allocate 1 more to allow appending '\0' to last filename. */ zipf->central_directory = ALLOC (zipf->dir_size+1); if (lseek (zipf->fd, -(zipf->dir_size+ECREC_SIZE+4), SEEK_CUR) < 0) return -2; if (read (zipf->fd, zipf->central_directory, zipf->dir_size) < 0) return -2; #ifdef TEST printf ("number_this_disk = %d\n", makeword(&buffer[NUMBER_THIS_DISK])); printf ("num_disk_with_start_central_dir = %d\n", makeword(&buffer[NUM_DISK_WITH_START_CENTRAL_DIR])); printf ("num_entries_centrl_dir_ths_disk = %d\n", makeword(&buffer[NUM_ENTRIES_CENTRL_DIR_THS_DISK])); printf ("total_entries_central_dir = %d\n", makeword(&buffer[TOTAL_ENTRIES_CENTRAL_DIR])); printf ("size_central_directory = %d\n", makelong(&buffer[SIZE_CENTRAL_DIRECTORY])); printf ("offset_start_central_directory = %d\n", makelong(&buffer[OFFSET_START_CENTRAL_DIRECTORY])); printf ("zipfile_comment_length = %d\n", makeword(&buffer[ZIPFILE_COMMENT_LENGTH])); #endif dir_last_pad = 0; dir_ptr = zipf->central_directory; for (i = 0; i < zipf->count; i++) { ZipDirectory *zipd = (ZipDirectory*)(dir_ptr + dir_last_pad); long uncompressed_size = makelong (&dir_ptr[4+C_UNCOMPRESSED_SIZE]); long filename_length = makeword (&dir_ptr[4+C_FILENAME_LENGTH]); long extra_field_length = makeword (&dir_ptr[4+C_EXTRA_FIELD_LENGTH]); long file_comment_length = makeword (&dir_ptr[4+C_FILE_COMMENT_LENGTH]); int unpadded_direntry_length; if ((dir_ptr-zipf->central_directory)+filename_length+CREC_SIZE+4>zipf->dir_size) return -1; zipd->filename_length = filename_length; zipd->size = uncompressed_size; #ifdef __GNUC__ #define DIR_ALIGN __alignof__(ZipDirectory) #else #define DIR_ALIGN sizeof(long) #endif zipd->filestart = makelong (&dir_ptr[4+C_RELATIVE_OFFSET_LOCAL_HEADER]) + (LREC_SIZE+4) + filename_length + file_comment_length + + (extra_field_length ? extra_field_length+4 : 0); /* About the last term of the expression above. Should the same apply if file_comment_length is not zero ? I've never seen the comment field uses so far. FIXME. */ zipd->filename_offset = CREC_SIZE+4 - dir_last_pad; unpadded_direntry_length = zipd->filename_offset + zipd->filename_length + extra_field_length; zipd->direntry_size = ((unpadded_direntry_length + DIR_ALIGN) / DIR_ALIGN) * DIR_ALIGN; dir_last_pad = zipd->direntry_size - unpadded_direntry_length; dir_ptr = (char*)zipd + unpadded_direntry_length; *dir_ptr = '\0'; } return 0; } #ifdef TEST main () { ZipFile zipf[1]; ZipDirectory *zipd; int i; zipf->fd = 0; i = read_zip_archive (zipf); if (i) { fprintf (stderr, "Bad zip file.\n"); exit (i); } zipd = (ZipDirectory*) zipf->central_directory; for (i = 0; i < zipf->count; i++, zipd = ZIPDIR_NEXT (zipd)) { printf ("%d: size:%d, name(#%d)%s, offset:%d\n", i, zipd->size, zipd->filename_length, ZIPDIR_FILENAME (zipd), zipd->filestart); } } #endif