PBZX handling of Yosemite-style Payload archives

// // main.c // pbzx // // Created by PHPdev32 on 6/20/14. // Licensed under GPLv3, full text at http://www.gnu.org/licenses/gpl-3.0.txt //

#include <stdint.h> #include <stdio.h> #include <string.h> #define err(m,e) { fprintf(stderr, m"\n"); return e; } #define fswap64(f,s) fread(&s, 8, 1, f); s = __builtin_bswap64(s) #define BSIZE 8 * 1024

int main(int argc, const char * argv[]) {

// insert code here...
char buffer[BSIZE];
fread(buffer, 4, 1, stdin);
if (strncmp(buffer, "pbzx", 4))
    err("Not a pbzx stream", 1);
uint64_t length = 0, flags = 0, last = 0;
fswap64(stdin, flags);
while (flags & 1 << 24) {
    fswap64(stdin, flags);
    fswap64(stdin, length);
    fread(buffer, 1, 6, stdin);
    if (strncmp(buffer, "\xfd""7zXZ\0", 6))
        err("Header is not <FD>7zXZ<00>", 2);
    length -= fwrite(buffer, 1, 6, stdout);
    while (length)
        length -= last = fwrite(buffer, 1, fread(buffer, 1, BSIZE < length ? BSIZE : length, stdin), stdout);
    if (strncmp(buffer + last - 2, "YZ", 2))
        err("Footer is not YZ", 3);
}
return 0;

}