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POFread on Lion does not read when length > 2G
 

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  1. POFread on Lion does not read when length > 2G
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    <p>Since Macosx Lion fread does not read file with length > 2G (int size, 2'147'483'648 bytes). It worked for years with macosx snow leopard.</p> <p>I wrote a program to test it :</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string.h&gt; int main(int argc, char *argv[]) { FILE *fin = NULL, *fout = NULL; char *ptr = NULL; size_t len; fpos_t flen; if (!(fin = fopen(argv[1], "rb"))) { printf("The input file: %s could not be opened\n", argv[1]); return -1; } if ((fout = fopen(argv[2], "rb"))) { printf("The output file %s already exist\n", argv[2]); fclose(fin); return -1; } if (!(fout = fopen(argv[2],"wb"))) { printf("Cannot write on output file %s\n", argv[2]); fclose(fin); return -1; } fseek(fin, 0, SEEK_END); fgetpos(fin, &amp;flen); len = flen; printf("Input file length : %zd\n", len); fseek(fin, 0, SEEK_SET); if (!(ptr = malloc(len))) { printf("Canot allocate %zd bytes\n", len); fclose(fin); fclose(fout); return -1; } if (fread(ptr, sizeof(char), len, fin) != len) { printf("Cannot read file\n"); fclose(fin); fclose(fout); free(ptr); return -1; } fclose(fin); if (fwrite(ptr, sizeof(char), len, fout) != len) { printf("Cannot write file\n"); fclose(fout); free(ptr); return -1; } free(ptr); fclose(fout); return 1; } </code></pre> <p>just run :</p> <ul> <li>./pgm inputfile outputfile</li> <li>openssl sha inputfile</li> <li>openssl sha outputfile</li> </ul> <p>There is no error. The length of the 2 files are the same. The two fingerprints are not the same. (The pointer is well allocated and write in the outputfile) Its only with fread, not fwrite.</p> <p>i don't understand the problem.</p> <p>I just see this program (i don't know if apple use this one on Lion) and r variable is defined as int. <a href="http://www.opensource.apple.com/source/Libc/Libc-186/stdio.subproj/fread.c" rel="nofollow">http://www.opensource.apple.com/source/Libc/Libc-186/stdio.subproj/fread.c</a></p> <p>Thanks for answers</p>
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    1. COIs OSX 32-bit or 64-bit? If it's 32-bit, there's no reason to expect to be able to read more than 2GB or even to be able to create an object that large in memory.
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