SherpackUtilities.cc

Go to the documentation of this file.

#include "GeneratorInterface/SherpaInterface/interface/SherpackUtilities.h"
#include <unistd.h>
namespace spu {
    
// functions for inflating (and deflating)

//~ /* Compress from file source to file dest until EOF on source.
   //~ def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
   //~ allocated for processing, Z_STREAM_ERROR if an invalid compression
   //~ level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
   //~ version of the library linked do not match, or Z_ERRNO if there is
   //~ an error reading or writing the files. */
int def(FILE *source, FILE *dest, int level)
{
    int ret, flush;
    unsigned have;
    z_stream strm;
    unsigned char in[CHUNK];
    unsigned char out[CHUNK];

    /* allocate deflate state */
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    ret = deflateInit(&strm, level);
    if (ret != Z_OK)
        return ret;

    /* compress until end of file */
    do {
        strm.avail_in = fread(in, 1, CHUNK, source);
        if (ferror(source)) {
            (void)deflateEnd(&strm);
            return Z_ERRNO;
        }
        flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
        strm.next_in = in;

        /* run deflate() on input until output buffer not full, finish
           compression if all of source has been read in */
        do {
            strm.avail_out = CHUNK;
            strm.next_out = out;
            ret = deflate(&strm, flush);    /* no bad return value */
            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
            have = CHUNK - strm.avail_out;
            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
                (void)deflateEnd(&strm);
                return Z_ERRNO;
            }
        } while (strm.avail_out == 0);
        assert(strm.avail_in == 0);     /* all input will be used */

        /* done when last data in file processed */
    } while (flush != Z_FINISH);
    assert(ret == Z_STREAM_END);        /* stream will be complete */

    /* clean up and return */
    (void)deflateEnd(&strm);
    return Z_OK;
}

/* Decompress from file source to file dest until stream ends or EOF.
   inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
   allocated for processing, Z_DATA_ERROR if the deflate data is
   invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
   the version of the library linked do not match, or Z_ERRNO if there
   is an error reading or writing the files. */
int inf(FILE *source, FILE *dest)
{
    int ret;
    unsigned have;
    z_stream strm;
    unsigned char in[CHUNK];
    unsigned char out[CHUNK];

    /* allocate inflate state */
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    strm.avail_in = 0;
    strm.next_in = Z_NULL;
    //~ ret = inflateInit(&strm,15);
    ret = inflateInit2(&strm, (16+MAX_WBITS));
    if (ret != Z_OK)
        return ret;

    /* decompress until deflate stream ends or end of file */
    do {
        strm.avail_in = fread(in, 1, CHUNK, source);
        if (ferror(source)) {
            (void)inflateEnd(&strm);
            return Z_ERRNO;
        }
        if (strm.avail_in == 0)
            break;
        strm.next_in = in;

        /* run inflate() on input until output buffer not full */
        do {
            strm.avail_out = CHUNK;
            strm.next_out = out;
            ret = inflate(&strm, Z_NO_FLUSH);
            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
            switch (ret) {
            case Z_NEED_DICT:
                ret = Z_DATA_ERROR;     /* and fall through */
            case Z_DATA_ERROR:
            case Z_MEM_ERROR:
                (void)inflateEnd(&strm);
                return ret;
            }
            have = CHUNK - strm.avail_out;
            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
                (void)inflateEnd(&strm);
                return Z_ERRNO;
            }
        } while (strm.avail_out == 0);

        /* done when inflate() says it's done */
    } while (ret != Z_STREAM_END);

    /* clean up and return */
    (void)inflateEnd(&strm);
    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}

/* report a zlib or i/o error */
void zerr(int ret)
{
    fputs("zpipe: ", stderr);
    switch (ret) {
    case Z_ERRNO:
        if (ferror(stdin))
            fputs("error reading stdin\n", stderr);
        if (ferror(stdout))
            fputs("error writing stdout\n", stderr);
        break;
    case Z_STREAM_ERROR:
        fputs("invalid compression level\n", stderr);
        break;
    case Z_DATA_ERROR:
        fputs("invalid or incomplete deflate data\n", stderr);
        break;
    case Z_MEM_ERROR:
        fputs("out of memory\n", stderr);
        break;
    case Z_VERSION_ERROR:
        fputs("zlib version mismatch!\n", stderr);
    }
}

/* compress or decompress from stdin to stdout */
int Unzip(std::string infile, std::string outfile)
{
    int ret;
    FILE *in = fopen(infile.c_str(),"r");
    if (!in) return -1;
    FILE *out = fopen(outfile.c_str(),"w");
    if (!out) return -2;
    /* avoid end-of-line conversions */
    SET_BINARY_MODE(in);
    SET_BINARY_MODE(out);

    ret = inf(in, out);
    if (ret != Z_OK)
        zerr(ret);
    
    fclose(in);
    fclose(out);
    return ret;
}



// functions for untaring Sherpacks
/* Parse an octal number, ignoring leading and trailing nonsense. */
int parseoct(const char *p, size_t n) {
    int i = 0;

    while (*p < '0' || *p > '7') {
        ++p;
        --n;
    }
    while (*p >= '0' && *p <= '7' && n > 0) {
        i *= 8;
        i += *p - '0';
        ++p;
        --n;
    }
    return (i);
}

/* Returns true if this is 512 zero bytes. */
int is_end_of_archive(const char *p) {
    int n;
    for (n = 511; n >= 0; --n)
        if (p[n] != '\0')
            return (0);
    return (1);
}

/* Create a directory, including parent directories as necessary. */
void create_dir(char *pathname, int mode) {
    char *p;
    int r;

    /* Strip trailing '/' */
    if (pathname[strlen(pathname) - 1] == '/')
        pathname[strlen(pathname) - 1] = '\0';

    /* Try creating the directory. */
    r = mkdir(pathname, mode);

    if (r != 0) {
        /* On failure, try creating parent directory. */
        p = strrchr(pathname, '/');
        if (p != NULL) {
            *p = '\0';
            create_dir(pathname, 0755);
            *p = '/';
            r = mkdir(pathname, mode);
        }
    }
    if (r != 0)
        fprintf(stderr, "Could not create directory %s\n", pathname);
}

/* Create a file, including parent directory as necessary. */
FILE* create_file(char *pathname, int mode) {
    FILE *f;
    f = fopen(pathname, "w+");
    if (f == NULL) {
        /* Try creating parent dir and then creating file. */
        char *p = strrchr(pathname, '/');
        if (p != NULL) {
            *p = '\0';
            create_dir(pathname, 0755);
            *p = '/';
            f = fopen(pathname, "w+");
        }
    }
    return (f);
}

/* Verify the tar checksum. */
int verify_checksum(const char *p) {
    int n, u = 0;
    for (n = 0; n < 512; ++n) {
        if (n < 148 || n > 155)
            /* Standard tar checksum adds unsigned bytes. */
            u += ((unsigned char *)p)[n];
        else
            u += 0x20;

    }
    return (u == parseoct(p + 148, 8));
}

/* Extract a tar archive. */
void Untar(FILE *a, const char *path) {
    bool longpathname=false;
    bool longlinkname=false;
    char newlongpathname[512];
    char newlonglinkname[512];
    char buff[512];
    FILE *f = NULL;
    size_t bytes_read;
    int filesize;

    printf("Extracting from %s\n", path);
    for (;;) {
        
        bytes_read = fread(buff, 1, 512, a);
        if (bytes_read < 512) {
            fprintf(stderr,
                "Short read on %s: expected 512, got %d\n",path, (int)bytes_read);
            return;
        }
        if (is_end_of_archive(buff)) {
            printf("End of %s\n", path);
            return;
        }
        if (!verify_checksum(buff)) {
            fprintf(stderr, "Checksum failure\n");
            return;
        }
        filesize = parseoct(buff + 124, 12);
//      printf("%c %d\n",buff[156],filesize);
        switch (buff[156]) {
        case '1':
            printf(" Ignoring hardlink %s\n", buff);
            break;
        case '2':
            if (longpathname && longlinkname){
                    longlinkname=false;
                    longpathname=false;
                    printf(" Extracting symlink %s\n", newlongpathname);
                    symlink(newlonglinkname,newlongpathname);                       
            } else if (longpathname) {
                    longpathname=false;
                    printf(" Extracting symlink %s\n", newlongpathname);
                    symlink(buff+157,newlongpathname);
            } else if (longlinkname) {
                    longlinkname=false;
                    printf(" Extracting symlink %s\n", buff);
                    symlink(newlonglinkname,buff);
            } else {
                    printf(" Extracting symlink %s\n", buff);
                    symlink(buff+157,buff);
            }
            break;
        case '3':
            printf(" Ignoring character device %s\n", buff);
                break;
        case '4':
            printf(" Ignoring block device %s\n", buff);
            break;
        case '5':
            if (!longpathname){
                int endposition=-1;
                for (int k=99; k>=0; k--){
                    if (buff[k]=='\0') endposition=k;
                }   
                if (endposition==-1) {
                    //~ printf("OLDNAME : %s\n",buff);
                    longpathname=true;
                    for (int k=0; k<100; k++){
                        newlongpathname[k]=buff[k];
                    }
                    newlongpathname[100]='\0';
                    //~ printf("NEWNAME : %s\n",newlongpathname);
                }
            }
        
            if (longpathname) {
                printf(" Extracting dir %s\n", newlongpathname);
                create_dir(newlongpathname, parseoct(buff + 100, 8));
                longpathname=false;
            } else {
            
                printf(" Extracting dir %s\n", buff);
                create_dir(buff, parseoct(buff + 100, 8));
            }
            //~ printf(" Extracting dir %s\n", buff);
            //~ create_dir(buff, parseoct(buff + 100, 8));
            filesize = 0;
            break;
        case '6':
            printf(" Ignoring FIFO %s\n", buff);
            break;
        case 'L':
            longpathname=true;
            //~ printf(" Long Filename found 0 %s\n", buff);
            //~ printf(" Long Filename found 100 %s\n", buff+100);
            //~ printf(" Long Filename found 108 %s\n", buff+108);
            //~ printf(" Long Filename found 116 %s\n", buff+116);
            //~ printf(" Long Filename found 124 %s\n", buff+124);
            //~ printf(" Long Filename found 136 %s\n", buff+136);
            //~ printf(" Long Filename found 148 %s\n", buff+148);
            //~ printf(" Long Filename found 156 %s\n", buff+156);
            //~ printf(" Long Filename found 157 %s\n", buff+157);
            //~ printf(" Long Filename found 158 %s\n", buff+158);
            //~ printf(" Long Filename found 159 %s\n", buff+159);
            //~ printf(" Long Filename found 257 %s\n", buff+257);
            //~ printf(" Long Filename found 263 %s\n", buff+263);
            //~ printf(" Long Filename found 265 %s\n", buff+265);
            //~ printf(" Long Filename found 297 %s\n", buff+297);
            //~ printf(" Long Filename found 329 %s\n", buff+329);
            //~ printf(" Long Filename found 337 %s\n", buff+337);
            //~ printf(" Long Filename found 345 %s\n", buff+345);
            //~ printf(" Long Filename found 346 %s\n", buff+346);
            //~ printf(" Long Filename found 347 %s\n", buff+347);
            break;  
        
        case 'K':
            longlinkname=true;
            break;

        default:
            if (!longpathname){
                int endposition=-1;
                for (int k=99; k>=0; k--){
                    if (buff[k]=='\0') endposition=k;
                }   
                if (endposition==-1) {
                    //~ printf("OLDNAME : %s\n",buff);
                    longpathname=true;
                    for (int k=0; k<100; k++){
                        newlongpathname[k]=buff[k];
                    }
                    newlongpathname[100]='\0';
                    //~ printf("NEWNAME : %s\n",newlongpathname);
                }
            }       
            if (longpathname) {
                printf(" Extracting file %s\n", newlongpathname);
                f = create_file(newlongpathname, parseoct(buff + 100, 8));
                longpathname=false;
            } else {
            
                printf(" Extracting file %s\n", buff);
                f = create_file(buff, parseoct(buff + 100, 8));
            }
            break;
        }
        
        if (longlinkname || longpathname) {
            if (buff[156]=='K'){
                
                for (int ll=0; ll<512; ll++){ printf("%c",buff[ll]);} printf("\n");
                bytes_read = fread(buff, 1, 512, a);
                for (int ll=0; ll<512; ll++){ printf("%c",buff[ll]);} printf("\n");
                for (int k=0; k<filesize; k++){
                    newlonglinkname[k]=buff[k];
                }
                newlonglinkname[filesize]='\0';
                for (int k=filesize+1; k<512; k++){
                    newlonglinkname[k]='0';
                }
                //~ printf("NEW LinkNAME: %s\n",newlonglinkname);   
            } else if (buff[156]=='L'){
                bytes_read = fread(buff, 1, 512, a);
                for (int k=0; k<filesize; k++){
                    newlongpathname[k]=buff[k];
                }
                newlongpathname[filesize]='\0';
                for (int k=filesize+1; k<512; k++){
                    newlongpathname[k]='0';
                }
            //~ printf("NEW FILENAME: %s\n",newlongpathname);   
            }
        }   
        
        //~ 
        //~ if (longpathname) {
            //~ bytes_read = fread(buff, 1, 512, a);
            //~ for (int k=0; k<filesize; k++){
                //~ newlongpathname[k]=buff[k];
            //~ }
            //~ newlongpathname[filesize]='\0';
            //~ for (int k=filesize+1; k<512; k++){
                //~ newlongpathname[k]='0';
            //~ }
            //~ printf("NEW FILENAME: %s\n",newlongpathname);   
            //~ 
        //~ }
        //~ else if (!longpathname && !longlinkname) { 
        if (!longpathname && !longlinkname) { 
            while (filesize > 0) {
                bytes_read = fread(buff, 1, 512, a);
                if (bytes_read < 512) {
                    fprintf(stderr,
                        "Short read on %s: Expected 512, got %d\n",   path, (int)bytes_read);
                    return;
                }
                if (filesize < 512)
                    bytes_read = filesize;
                if (f != NULL) {
                    if (fwrite(buff, 1, bytes_read, f)
                        != bytes_read)
                    {
                        fprintf(stderr, "Failed write\n");
                        fclose(f);
                        f = NULL;
                    }
                }
                filesize -= bytes_read;
            }
            if (f != NULL) {
                fclose(f);
                f = NULL;
            }
        }
    }
}



// function for calculating the MD5 checksum of a file
void md5_File(std::string filename, char* result ) {
      char buffer[4096];
      MD5_CTX md5;       
      MD5_Init(&md5);

      //Open File
      int fd = open(filename.c_str(), O_RDONLY);
      int nb_read;
      while ((nb_read = read(fd, buffer, 4096 - 1)))
        {
          MD5_Update(&md5, buffer, nb_read);
          memset(buffer, 0, 4096);
        }
      unsigned char tmp[MD5_DIGEST_LENGTH];
      MD5_Final(tmp, &md5);

      //Convert the result
      for (int k = 0; k < MD5_DIGEST_LENGTH; ++k) {
        sprintf(result + k * 2, "%02x", tmp[k]);
      }  
}


} // End namespace spu