root/ext/zip/lib/zip_source_filep.c

DEFINITIONS

1. zip_source_filep
2. _zip_source_file_or_p
3. read_file

   1 /*
   2   zip_source_filep.c -- create data source from FILE *
   3   Copyright (C) 1999-2009 Dieter Baron and Thomas Klausner
   4 
   5   This file is part of libzip, a library to manipulate ZIP archives.
   6   The authors can be contacted at <libzip@nih.at>
   7 
   8   Redistribution and use in source and binary forms, with or without
   9   modification, are permitted provided that the following conditions
  10   are met:
  11   1. Redistributions of source code must retain the above copyright
  12      notice, this list of conditions and the following disclaimer.
  13   2. Redistributions in binary form must reproduce the above copyright
  14      notice, this list of conditions and the following disclaimer in
  15      the documentation and/or other materials provided with the
  16      distribution.
  17   3. The names of the authors may not be used to endorse or promote
  18      products derived from this software without specific prior
  19      written permission.
  20  
  21   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  22   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  25   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  29   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  30   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  31   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32 */
  33 
  34 
  35 
  36 #include <sys/stat.h>
  37 #include <errno.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 
  42 #include "zipint.h"
  43 
  44 struct read_file {
  45     char *fname;        /* name of file to copy from */
  46     FILE *f;            /* file to copy from */
  47     int closep;         /* close f */
  48     struct zip_stat st; /* stat information passed in */
  49 
  50     zip_uint64_t off;   /* start offset of */
  51     zip_int64_t len;    /* length of data to copy */
  52     zip_int64_t remain; /* bytes remaining to be copied */
  53     int e[2];           /* error codes */
  54 };
  55 
  56 static zip_int64_t read_file(void *state, void *data, zip_uint64_t len,
  57                      enum zip_source_cmd cmd);
  58 
  59 
  60 
  61 ZIP_EXTERN struct zip_source *
  62 zip_source_filep(struct zip *za, FILE *file, zip_uint64_t start,
  63                  zip_int64_t len)
  64 {
  65     if (za == NULL)
  66         return NULL;
  67 
  68     if (file == NULL || len < -1) {
  69         _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
  70         return NULL;
  71     }
  72 
  73     return _zip_source_file_or_p(za, NULL, file, start, len, 1, NULL);
  74 }
  75 
  76 
  77 
  78 struct zip_source *
  79 _zip_source_file_or_p(struct zip *za, const char *fname, FILE *file,
  80                       zip_uint64_t start, zip_int64_t len, int closep,
  81                       const struct zip_stat *st)
  82 {
  83     struct read_file *f;
  84     struct zip_source *zs;
  85 
  86     if (file == NULL && fname == NULL) {
  87         _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
  88         return NULL;
  89     }
  90 
  91     if ((f=(struct read_file *)malloc(sizeof(struct read_file))) == NULL) {
  92         _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
  93         return NULL;
  94     }
  95 
  96     f->fname = NULL;
  97     if (fname) {
  98         if ((f->fname=strdup(fname)) == NULL) {
  99             _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
 100             free(f);
 101             return NULL;
 102         }
 103     }
 104     f->f = file;
 105     f->off = start;
 106     f->len = (len ? len : -1);
 107     f->closep = f->fname ? 1 : closep;
 108     if (st)
 109         memcpy(&f->st, st, sizeof(f->st));
 110     else
 111         zip_stat_init(&f->st);
 112 
 113     if ((zs=zip_source_function(za, read_file, f)) == NULL) {
 114         free(f);
 115         return NULL;
 116     }
 117 
 118     return zs;
 119 }
 120 
 121 
 122 
 123 static zip_int64_t
 124 read_file(void *state, void *data, zip_uint64_t len, enum zip_source_cmd cmd)
 125 {
 126     struct read_file *z;
 127     char *buf;
 128     zip_uint64_t n;
 129     size_t i;
 130 
 131     z = (struct read_file *)state;
 132     buf = (char *)data;
 133 
 134     switch (cmd) {
 135     case ZIP_SOURCE_OPEN:
 136         if (z->fname) {
 137             if ((z->f=fopen(z->fname, "rb")) == NULL) {
 138                 z->e[0] = ZIP_ER_OPEN;
 139                 z->e[1] = errno;
 140                 return -1;
 141             }
 142         }
 143 
 144         if (z->closep && z->off > 0) {
 145             if (fseeko(z->f, (off_t)z->off, SEEK_SET) < 0) {
 146                 z->e[0] = ZIP_ER_SEEK;
 147                 z->e[1] = errno;
 148                 return -1;
 149             }
 150         }
 151         z->remain = z->len;
 152         return 0;
 153         
 154     case ZIP_SOURCE_READ:
 155         if (z->remain != -1)
 156             n = len > (zip_uint64_t)z->remain ? (zip_uint64_t)z->remain : len;
 157         else
 158             n = len;
 159             
 160         if (n > SIZE_MAX)
 161             n = SIZE_MAX;
 162 
 163         if (!z->closep) {
 164             /* we might share this file with others, so let's be safe */
 165             if (fseeko(z->f, (off_t)(z->off + (zip_uint64_t)(z->len-z->remain)), SEEK_SET) < 0) {
 166                 z->e[0] = ZIP_ER_SEEK;
 167                 z->e[1] = errno;
 168                 return -1;
 169             }
 170         }
 171 
 172         if ((i=fread(buf, 1, (size_t)n, z->f)) == 0) {
 173             if (ferror(z->f)) {
 174                 z->e[0] = ZIP_ER_READ;
 175                 z->e[1] = errno;
 176                 return -1;
 177             }
 178         }
 179 
 180         if (z->remain != -1)
 181             z->remain -= i;
 182 
 183         return (zip_int64_t)i;
 184         
 185     case ZIP_SOURCE_CLOSE:
 186         if (z->fname) {
 187             fclose(z->f);
 188             z->f = NULL;
 189         }
 190         return 0;
 191 
 192     case ZIP_SOURCE_STAT:
 193         {
 194             if (len < sizeof(z->st))
 195                 return -1;
 196 
 197             if (z->st.valid != 0)
 198                 memcpy(data, &z->st, sizeof(z->st));
 199             else {
 200                 struct zip_stat *st;
 201                 struct stat fst;
 202                 int err;
 203             
 204                 if (z->f)
 205                     err = fstat(fileno(z->f), &fst);
 206                 else
 207                     err = stat(z->fname, &fst);
 208 
 209                 if (err != 0) {
 210                     z->e[0] = ZIP_ER_READ; /* best match */
 211                     z->e[1] = errno;
 212                     return -1;
 213                 }
 214 
 215                 st = (struct zip_stat *)data;
 216                 
 217                 zip_stat_init(st);
 218                 st->mtime = fst.st_mtime;
 219                 st->valid |= ZIP_STAT_MTIME;
 220                 if (z->len != -1) {
 221                     st->size = (zip_uint64_t)z->len;
 222                     st->valid |= ZIP_STAT_SIZE;
 223                 }
 224                 else if ((fst.st_mode&S_IFMT) == S_IFREG) {
 225                     st->size = (zip_uint64_t)fst.st_size;
 226                     st->valid |= ZIP_STAT_SIZE;
 227                 }
 228             }
 229             return sizeof(z->st);
 230         }
 231 
 232     case ZIP_SOURCE_ERROR:
 233         if (len < sizeof(int)*2)
 234             return -1;
 235 
 236         memcpy(data, z->e, sizeof(int)*2);
 237         return sizeof(int)*2;
 238 
 239     case ZIP_SOURCE_FREE:
 240         free(z->fname);
 241         if (z->closep && z->f)
 242             fclose(z->f);
 243         free(z);
 244         return 0;
 245 
 246     default:
 247         ;
 248     }
 249 
 250     return -1;
 251 }