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/*

  jargrep.c - main functions for jargrep utility

  Copyright (C) 2002, 2003, 2006 Free Software Foundation

  Copyright (C) 1999, 2000 Bryan Burns

  Copyright (C) 2000 Cory Hollingsworth

  Parts of this program are base on Bryan Burns work with fastjar

  Copyright (C) 1999.

  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

  of the License, 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 this program; if not, write to the Free Software

  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/

/* Id: jargrep.c,v 1.5 2002/01/03 04:57:56 rodrigc Exp

Log: jargrep.c,v

Revision 1.5  2002/01/03 04:57:56  rodrigc

2001-01-02  Craig Rodrigues  <rodrigc@gcc.gnu.org>

        PR bootstrap/5117

        * configure.in (AC_CHECK_HEADERS): Check for stdlib.h.

        * Makefile.am: Move grepjar to bin_PROGRAMS.

        * config.h.in: Regenerated.

        * Makefile.in: Regenerated.

        * aclocal.m4: Regenerated.

        * jargrep.c: Eliminate some signed/unsigned and default

        uninitialized warnings. Use HAVE_STDLIB_H instead of

        STDC_HEADERS macro.

        * jartool.c: Likewise.

        * compress.c: Likewise.

Revision 1.4  2000/12/15 18:45:09  tromey

        * jargrep.c: Include getopt.h if it exists.

        (optind): Declare.

        * configure, config.h: Rebuilt.

        * configure.in: Check for getopt.h.

Revision 1.3  2000/12/14 18:45:35  ghazi

Warning fixes:

        * compress.c: Include stdlib.h and compress.h.

        (rcsid): Delete.

        (report_str_error): Make static.

        (ez_inflate_str): Delete unused variable.  Add parens in if-stmt.

        (hrd_inflate_str): Likewise.

        * compress.h (init_compression, end_compression, init_inflation,

        end_inflation): Prototype void arguments.

        * dostime.c (rcsid): Delete.

        * jargrep.c: Include ctype.h, stdlib.h, zlib.h and compress.h.

        Make functions static.  Cast ctype function argument to `unsigned

        char'.  Add parens in if-stmts.  Constify.

        (Usage): Change into a macro.

        (jargrep): Remove unused parameter.

        * jartool.c: Constify.  Add parens in if-stmts.  Align

        signed/unsigned char pointers in functions calls using casts.

        (rcsid): Delete.

        (list_jar): Fix printf format specifier.

        (usage): Chop long string into bits.  Reformat.

        * pushback.c (rcsid): Delete.

Revision 1.2  2000/12/11 02:59:55  apbianco

2000-12-10  Robert Lipe <robertlipe@usa.net>

        * jargrep.c (jargrep): Added null statement after case.

2000-12-10  Alexandre Petit-Bianco  <apbianco@cygnus.com>

        * Makefile: Removed.

        * Makefile.in: Rebuilt with `-i' and `--enable-foreign'.

(http://gcc.gnu.org/ml/gcc/2000-12/msg00294.html)

Revision 1.1  2000/12/09 03:08:23  apbianco

2000-12-08  Alexandre Petit-Bianco  <apbianco@cygnus.com>

        * fastjar: Imported.

Revision 1.8  2000/09/13 14:02:02  cory

Reformatted some of the code to more closly match the layout of the orriginal

fastjar utility.

Revision 1.7  2000/09/12 22:29:36  cory

Jargrep now seems to do what I want it to do.  Performs properly on Linux x86,

will test some other platforms later.

*/

#include "config.h"

#include <stdio.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <ctype.h>

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#include "xregex.h"

#include "jargrep.h"

#include "jartool.h"

#include "pushback.h"

#include "zipfile.h"

#include "zlib.h"

#include "compress.h"

#include <getopt.h>

void version(void);

void help(const char *name);

#define Usage "Usage: %s [-bcinsVw] [--version|--help] <-e PATTERN | PATTERN> FILE ...\n"

/*

Function name: opt_valid

arg:    options Bitfield flag that contains the command line options of grepjar.

purpose:        To guard agains the occurance of certain incompatible flags being used

together.

returns: TRUE if options are valid, FALSE otherwise.

*/

static int opt_valid(int options) {

        int retflag;

        if((options & JG_PRINT_COUNT) &&

                (options & (JG_PRINT_BYTEOFFSET | JG_PRINT_LINE_NUMBER)))

        {

                retflag = FALSE;

        }

        else retflag = TRUE;

        return retflag;

}

/*

Function name: create_regexp

args:   regstr  String containing the uncompiled regular expression.  This may be the

                                expression as is passed in through argv.

                options This is the flag containing the commandline options that have been

                                parsed by getopt.

purpose: Handle the exception handling involved with setting upt a new regular

expression.

returns: Newly allocated compile regular expression ready to be used in an regexec call.

*/

static regex_t *create_regexp(const char *regstr, int options) {

        regex_t *exp;

        int errcode;

        int msgsize;

        char *errmsg;

        if((exp = (regex_t *) malloc(sizeof(regex_t))))

        {

                if((errcode = regcomp(exp, regstr, (options & JG_IGNORE_CASE) ? REG_ICASE : 0))) {

                        fprintf(stderr, "regcomp of regex failed,\n");

                        if((errmsg = (char *) malloc(msgsize = regerror(errcode, exp, NULL, 0) + 1))) {

                                regerror(errcode, exp, errmsg, msgsize);

                                fprintf(stderr, "Error: %s\n", errmsg);

                                free(exp);

                                free(errmsg);

                                exit(1);

                        }

                        else {

                                fprintf(stderr, "Malloc of errmsg failed.\n");

                                fprintf(stderr, "Error: %s\n", strerror(errno));

                                free(exp);

                                exit(1);

                        }

                }

        }

        else {

                fprintf(stderr, "Malloc of regex failed,\n");

                fprintf(stderr, "Error: %s\n", strerror(errno));

                exit(1);

        }

        return exp;

}

/*

Function name: check_sig

args:   scratch Pointer to array of bytes containing signature.

                pbf             Pointer to push back handle for jar file.

purpose:        Verify that checksum is correct.

returns: 0, 1, or 2.  0 means we are ready to read embedded file information.  1 means

we have read beyound the embedded file list and can exit knowing we have read all the

relevent information.  2 means we still haven't reached embdedded file list and need to

do some more reading.

*/

static int check_sig(ub1 *scratch, pb_file *pbfp) {

        ub4 signature;

        int retflag = 0;

        signature = UNPACK_UB4(scratch, 0);

#ifdef DEBUG    

    printf("signature is %x\n", signature);

#endif

    if(signature == 0x08074b50){

#ifdef DEBUG    

      printf("skipping data descriptor\n");

#endif

      pb_read(pbfp, scratch, 12);

      retflag = 2;

    } else if(signature == 0x02014b50){

#ifdef DEBUG    

      printf("Central header reached.. we're all done!\n");

#endif

      retflag = 1;

    }else if(signature != 0x04034b50){

      printf("Ick! %#x\n", signature);

      retflag = 1;

    }

        return retflag;

}

/*

Function name: decd_siz

args    csize           Pointer to embedded file's compressed size.

                usize           Pointer to embedded file's uncmpressed size.

                fnlen           Pointer to embedded file's file name length.

                elfen           Pointer to length of extra fields in jar file.

                flags           Pointer to bitmapped flags.

                method          Pointer to indicator of storage method of embedded file.

                file_header     Pointer to string containing the above values to be unbacked.

Purpose: Unpack the series of values from file_header.

*/

static void decd_siz(ub4 *csize, ub4 *usize, ub2 *fnlen, ub2 *eflen, ub2 *flags, ub2 *method, ub1 *file_header) {

    *csize = UNPACK_UB4(file_header, LOC_CSIZE);

#ifdef DEBUG    

    printf("Compressed size is %u\n", *csize);

#endif

        *usize = UNPACK_UB4(file_header, LOC_USIZE);

#ifdef DEBUG

        printf("Uncompressed size is %u\n", *usize);

#endif

    *fnlen = UNPACK_UB2(file_header, LOC_FNLEN);

#ifdef DEBUG    

    printf("Filename length is %hu\n", *fnlen);

#endif

    *eflen = UNPACK_UB2(file_header, LOC_EFLEN);

#ifdef DEBUG    

    printf("Extra field length is %hu\n", *eflen);

#endif

    *flags = UNPACK_UB2(file_header, LOC_EXTRA);

#ifdef DEBUG    

    printf("Flags are %#hx\n", *flags);

#endif

    *method = UNPACK_UB2(file_header, LOC_COMP);

#ifdef DEBUG

    printf("Compression method is %#hx\n", *method);

#endif

}

/*

Function name: new_filename

args:   pbf             Pointer to push back file handle.  Used for reading input file.

                len             Length of file name to be read.

purpose:        Read in the embedded file name from jar file.

returns: Pointer to newly allocated string containing file name.

*/

static char *new_filename(pb_file *pbf, ub4 len) {

        char *filename;

        if(!(filename = (char *) malloc(len + 1))) {

                fprintf(stderr, "Malloc failed of filename\n");

                fprintf(stderr, "Error: %s\n", strerror(errno));

        }

    pb_read(pbf, filename, len);

    filename[len] = '\0';

#ifdef DEBUG    

    printf("filename is %s\n", filename);

#endif

        return filename;

}

/*

Funtion name: read_string

args:   pbf             Pointer to push back file handle.  Used for reading input file.

                size    Size of embedded file in bytes.

purpose:        Create a string containing the contents of the embedded noncompressed file.

returns: Pointer to newly allocated string containing embedded file contents.

*/

static char *read_string(pb_file *pbf, int size) {

        char *page;

        if((page = (char *) malloc(size + 1))) {

                pb_read(pbf, page, size);

                page[size] = '\0';

        }

        else {

                fprintf(stderr, "Malloc of page buffer failed.\n");

                fprintf(stderr, "Error: %s\n", strerror(errno));

                exit(1);

        }

        return page;

}

/*

Function name: extract_line

args:   stream  String containing the full contents of a file which is to be substringed

                                in order to provide line representing our grep output.

                begin   Index into stream which regular expression first matches.

                end             Index into stream which end of match to the regular expression.

                b               Pointer to the index of what will be the beginning of the line when

                                string is returned.  Used for -b option.

purpose:        Create a string that can be printed by jargrep from the long string stream.

The matching line that is printed out by jargrep is generated by this function.

returns: Pointer to newly allocated string containing matched expression.

*/

static char *extract_line(const char *stream, regoff_t begin, regoff_t end, int *b) {

        int e;

        int length;

        char *retstr;

        for(*b = begin; *b >= 0 && !iscntrl((unsigned char)stream[*b]); (*b)--);

        (*b)++;

        for(e = end; stream[e] == '\t' || !iscntrl((unsigned char)stream[e]); e++);

        length = e - *b;

        if((retstr = (char *) malloc(length + 1))) {

                sprintf(retstr, "%d:", *b);

                strncpy(retstr, &(stream[*b]), length);

                retstr[length] = '\0';

        }

        else {

                fprintf(stderr, "Malloc failed of output string.\n");

                fprintf(stderr, "Error: %s\n", strerror(errno));

                exit(1);

        }

        return retstr;

}

/*

Function name: chk_wrd

args:   exp             Pointer to compiled POSIX style regular expression of search target.

                str             String known to contain at least one match of exp.

purpose: Verify that the occurance of the regular expression in str occurs as a whole

word and not a substring of another word.

returns: TRUE if it is a word, FALSE of it is a substring.

*/

static int chk_wrd(regex_t *exp, const char *str) {

        int wrd_fnd = FALSE;

        int frnt_ok;

        int bck_ok;

        const char *str2;

        regmatch_t match;

        str2 = str;

        frnt_ok = bck_ok = FALSE;

        while(!wrd_fnd && !regexec(exp, str2, 1, &match, 0)) {

                if(!match.rm_so && (str2 == str)) frnt_ok = TRUE;

                else if(!isalnum((unsigned char)str2[match.rm_so - 1])

                        && str2[match.rm_so - 1] != '_')

                        frnt_ok = TRUE;

                else frnt_ok = FALSE;

                if(frnt_ok) {

                        if(str2[match.rm_eo] == '\0') bck_ok = TRUE;

                        else if(!isalnum((unsigned char)str2[match.rm_eo])

                                && str2[match.rm_eo] != '_')

                                bck_ok = TRUE;

                        else bck_ok = FALSE;

                }

                wrd_fnd = frnt_ok && bck_ok;

                str2 = &(str2[match.rm_eo]);

        }

        return wrd_fnd;

}

/*

Function name: prnt_mtchs

args:   exp                     Pointer to compiled POSIX style regular expression of search target.

                filename        String containing the name of the embedded file which matches have

                                        been found in.

                stream          String containing the processed contents of the embedded jar file

                                        represended with filename.

                pmatch          Array of regmatch_t matches into stream.

                nl_offset       Array of offsets of '\n' characters in stream.  May be NULL if -n is

                                        not set on command line.

                num                     Number of matches in pmatch array.

                lines           Number of lines in file.  Not set if -n is not set on command line.

                options         Bitwise flag containing flags set to represent the command line

                                        options.

purpose:        Control output of jargrep.  Output is controlled by which options have been

set at the command line.

*/

static void prnt_mtchs(regex_t *exp, const char *filename, const char *stream, regmatch_t *pmatch, regmatch_t *nl_offset, int num, int lines, int options) {

        int i;

        int j = 0;

        int ln_cnt;

        int begin;

        int o_begin;

        char *str;

        o_begin = -1;

        ln_cnt = 0;

        for(i = 0; i < num; i++) {

                str = extract_line(stream, pmatch[i].rm_so, pmatch[i].rm_eo, &begin);

                if(begin > o_begin) {

                        if(!(options & JG_WORD_EXPRESSIONS) || chk_wrd(exp, str)) {

                                ln_cnt++;

                                if(!(options & JG_PRINT_COUNT)) {

                                        printf("%s:", filename);

                                        if(options & JG_PRINT_LINE_NUMBER) {

                                                for(; j < lines && nl_offset[j].rm_so < begin; j++);

                                                printf("%d:", j + 1);

                                        }

                                        if(options & JG_PRINT_BYTEOFFSET) printf("%d:", begin);

                                        printf("%s\n", str);

                                }

                        }

                }

                o_begin = begin;

                free(str);

        }

        if(options & JG_PRINT_COUNT) printf("%s:%d\n", filename, ln_cnt);

}

/*

Function name: check_crc

args:   pbf             Pointer to pushback file pointer for jar file.

                stream  String containing the non modified contents fo the extraced file entry.

                usize   Size of file in bytes.

purpose:        Verify the CRC matches that as what is stored in the jar file.

*/

static void check_crc(pb_file *pbf, const char *stream, ub4 usize) {

        ub4 crc=0;

        ub4 lcrc;

        ub1 scratch[16];

        crc = crc32(crc, NULL, 0);

        crc = crc32(crc, (const unsigned char *)stream, usize);

        if(pb_read(pbf, scratch, 16) != 16) {

                perror("read");

        exit(1);

        }

        if(UNPACK_UB4(scratch, 0) != 0x08074b50) {

                fprintf(stderr, "Error! Missing data descriptor!\n");

                exit(1);

        }

        lcrc = UNPACK_UB4(scratch, 4);

        if(crc != lcrc){

        fprintf(stderr, "Error! CRCs do not match! Got %x, expected %x\n",

              crc, lcrc);

        exit(1);

    }

}

/*

Function name mk_ascii

args:   stream  String that contains the contents of the extraced file entry.

                usize   String size.

purpose:        Make certain that the contents of the file are ASCII, not binary.  This

permits grepping of binary files as well by converting non ASCII and control characters

into '\n'.

*/

static void mk_ascii(char *stream, size_t usize) {

        size_t i;

        for(i = 0; i < usize; i++)

                if(stream[i] != '\t'

                   && (iscntrl((unsigned char)stream[i])

                       || (unsigned char) stream[i] >= 128))

                        stream[i] = '\n';

}

/*

Funtion name: fnd_match

args:   exp                     Pointer to compiled POSIX style regular expression of search target.

                str_stream      String that contains the contents of the extracted file entry.

                i                       Pointer to counter and index of matches.

purpose:        Search str_stream for occurances of the regular expression exp and create

an array of matches.

returns:  Pointer to newly allocated array of regmatch_t which gives indexes to start

and end of matches.  NULL is returned upon no matches found.

*/

static regmatch_t *fnd_match(regex_t *exp, const char *str_stream, int *i) {

        int regflag;

        regmatch_t match;

        regmatch_t *match_array;

        regmatch_t *tmp;

        match_array = NULL;

        for(*i = 0, regflag = regexec(exp, str_stream, 1, &match, 0); !regflag;

                regflag = regexec(exp, &(str_stream[match.rm_eo]), 1, &match, 0), (*i)++)

        {

                if((tmp = (regmatch_t *)

                    realloc(match_array, sizeof(regmatch_t) * ((*i) + 1))))

                {

                        match_array = tmp;

                        if(*i) {

                                match.rm_so += match_array[(*i) - 1].rm_eo;

                                match.rm_eo += match_array[(*i) - 1].rm_eo;

                        }

                        match_array[*i] = match;

                }

                else {

                        fprintf(stderr, "Realloc of match_array failed.\n");

                        fprintf(stderr, "Error: %s\n", strerror(errno));

                        exit(1);

                }

        }

        return match_array;

}

/*

Function name: cont_grep

args:   exp             Pointer to compiled POSIX style regular expression of search target.

                nl_exp  Pointer to compiled POSIX style regular expression of newlines.  This

                                argument is NULL unless the -n option is used on the command line.

                fd              File descriptor of the jar file being grepped.

                pbf             Pointer to pushback file style file stream.  This is for use with

                                the pushback.c file io funtions.

                options Bitwise flag containing flags set to represent the command line options.

purpose:        This function handles single entries in an open jar file.  The header is

read and then the embeded file is extracted and grepped.

returns: FALSE upon failure, TRUE otherwise.

*/

static int cont_grep(regex_t *exp, regex_t *nl_exp, int fd, pb_file *pbf, int options) {

        int retflag = TRUE;

        int i;

        int j;

        ub4 csize;

        ub4 usize;

        ub2 fnlen;

        ub2 eflen;

        ub2 flags;

        ub2 method;

        ub1 file_header[30];

        char *filename;

        char *str_stream;

        regmatch_t *match_array;

        regmatch_t *nl_offsets=0;

        if(pb_read(pbf, (file_header + 4), 26) != 26) {

                perror("read");

                retflag = FALSE;

        }

        else {

                decd_siz(&csize, &usize, &fnlen, &eflen, &flags, &method, file_header);

                filename = new_filename(pbf, fnlen);

                lseek(fd, eflen, SEEK_CUR);

                if(filename[fnlen - 1] != '/') {

                        str_stream = (method == 8 || (flags & 0x0008)) ?

                                (char *) inflate_string(pbf, &csize, &usize) :

                                        read_string(pbf, csize);

                        if(flags & 0x008) check_crc(pbf, str_stream, usize);

                        mk_ascii(str_stream, usize);

                        match_array = fnd_match(exp, str_stream, &i);

                        if((options & JG_PRINT_LINE_NUMBER) && i)

                                nl_offsets = fnd_match(nl_exp, str_stream, &j);

                        prnt_mtchs(exp, filename, str_stream, match_array, nl_offsets, i, j, options);

                        if(match_array) free(match_array);

                        free(str_stream);

                }

                free(filename);

                retflag = TRUE;

        }

        return retflag;

}

/*

Funtion name: jargrep

args:   exp             Pointer to compiled POSIX style regular expression of search target.

                nl_exp  Pointer to compiled regular expression for newlines or NULL.  Only set

                                if -n option is present at command line.

                jarfile Filename of jar file to be searched.

                options Bitwise flag containing flags set to represent the command line options.

purpose:        Open jar file.  Check signatures.  When right signature is found go to deeper

grep routine.

*/

static void jargrep(regex_t *exp, regex_t *nl_exp, const char *jarfile, int options){

        int fd;

        int floop = TRUE;

        pb_file pbf;

        ub1 scratch[16];

        if((fd = open(jarfile, O_RDONLY)) == -1) {

                if(!(options & JG_SUPRESS_ERROR))

                        fprintf(stderr, "Error reading file '%s': %s\n", jarfile, strerror(errno));

        }

        else {

                pb_init(&pbf, fd);

                do {

                        if(pb_read(&pbf, scratch, 4) != 4) {

                                perror("read");

                                floop = FALSE;

                        }

                        else {

                                switch (check_sig(scratch, &pbf)) {

                                case 0:

                                        floop = cont_grep(exp, nl_exp, fd, &pbf, options);

                                        break;

                                case 1:

                                        floop = FALSE;

                                        break;

                                case 2:

                                        /* fall through continue */

                                        ;

                                }

                        }

                } while(floop);

        }

}

/* This is used to mark options with no short value.  */

#define LONG_OPT(Num)  ((Num) + 128)

#define OPT_HELP     LONG_OPT (0)

static const struct option option_vec[] =

{

  { "help", no_argument, NULL, OPT_HELP },

  { "version", no_argument, NULL, 'V' },

  { NULL, no_argument, NULL, 0 }

};

/*

Funtion Name: main

args:   argc    number of in coming args.

                argv    array of strings.

purpose: Entry point of the program.  Parse command line arguments and set options.

Set up regular expressions.  Call grep routines for each file as input.

returns: 1 on error 0 on success.

*/

int main(int argc, char **argv) {

        int c;

        int retval = 0;

        int fileindex;

        int options = 0;

        regex_t *regexp;

        regex_t *nl_exp = NULL;

        char *regexpstr = NULL;

        while((c = getopt_long(argc, argv, "bce:insVw",

                               option_vec, NULL)) != -1) {

                switch(c) {

                        case 'b':

                                options |= JG_PRINT_BYTEOFFSET;