xar-additions/xar-additions.c

   1 #include <xar/xar.h>
   2
   3 extern int32_t xar_arcmod_extract(xar_t x, xar_file_t f, const char *file, char *buffer, size_t len);
   4
   5 /* xar_extract_tobuffer
   6 * x: archive to extract from
   7 * buffer: buffer to extract to
   8 * size: On return, this will contain the size of the memory pointed to by buffer
   9 * Returns 0 on success, -1 on failure.
  10 * Summary: This is the entry point for extraction to a buffer.
  11 * On success, a buffer is allocated with the contents of the file
  12 * specified.  The caller is responsible for freeing the returend buffer.
  13 * Example: xar_extract_tobuffer(x, "foo/bar/blah",&buffer)
  14 */
  15 int32_t xar_extract_tobuffersz(xar_t x, xar_file_t f, char **buffer, size_t *size) {
  16         const char *sizestring = NULL;
  17         int32_t ret;
  18
  19         if(0 != xar_prop_get(f,"data/size",&sizestring)){
  20                 if(0 != xar_prop_get(f, "type", &sizestring))
  21                         return -1;
  22                 if(strcmp(sizestring, "file") == 0) {
  23                         *size = 0;
  24                         return 0;
  25                 }
  26                 return -1;
  27         }
  28
  29         *size = strtoull(sizestring, (char **)NULL, 10);
  30         *buffer = malloc(*size);
  31
  32         if(!(*buffer)){
  33                 return -1;
  34         }
  35
  36         ret = xar_arcmod_extract(x,f,NULL,*buffer,*size);
  37         if( ret ) {
  38                 *size = 0;
  39                 free(*buffer);
  40                 *buffer = NULL;
  41         }
  42
  43         return ret;
  44 }