home *** CD-ROM | disk | FTP | other *** search
- /* 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 Cygnus Support
-
- See the file "license.terms" for information on usage and redistribution
- of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-
- Written by Per Bothner <bothner@cygnus.com>, February 1996.
- */
-
- #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). */
-
- #include <stdio.h>
- #ifdef __STDC__
- #include <stdlib.h>
- #endif
- #include <errno.h> /* used in mapname() */
-
- /*************/
- /* 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, -(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]);
- 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;
- zipd->filename_offset = CREC_SIZE+4 - dir_last_pad;
- unpadded_direntry_length = zipd->filename_offset + zipd->filename_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
-