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#include <stdio.h>
#include <stdlib.h>
#include <archive.h>
#include <archive_entry.h>
#include <fcntl.h>
#include <linux/limits.h>
#include "common.h"
#include "tar.h"
static inline int copy_data(struct archive* ar, struct archive* aw)
{
int r;
const void *buff;
size_t size;
la_int64_t offset;
for (;;)
{
r = archive_read_data_block(ar, &buff, &size, &offset);
if (r == ARCHIVE_EOF) return (ARCHIVE_OK);
if (r < ARCHIVE_OK) return (r);
// why does read return an int but write not?
r = (int)archive_write_data_block(aw, buff, size, offset);
if (r < ARCHIVE_OK)
{
printf("%s\n", archive_error_string(aw));
return (r);
}
}
}
void extract(const struct MemoryStruct* tar, const char* outputdir)
{
char cwd[PATH_MAX];
void* err = getcwd(cwd, sizeof(cwd));
if (chdir(outputdir) < 0)
{
printf("Cannot change to %s\n", outputdir);
return;
}
struct archive* a;
struct archive* ext;
struct archive_entry* entry;
int flags, r;
/* Select which attributes we want to restore. */
flags = ARCHIVE_EXTRACT_TIME;
flags |= ARCHIVE_EXTRACT_PERM;
flags |= ARCHIVE_EXTRACT_ACL;
flags |= ARCHIVE_EXTRACT_FFLAGS;
a = archive_read_new();
archive_read_support_format_all(a);
archive_read_support_filter_all(a);
ext = archive_write_disk_new();
archive_write_disk_set_options(ext, flags);
archive_write_disk_set_standard_lookup(ext);
if (archive_read_open_memory(a, tar->memory, tar->size)) return;
for (;;)
{
r = archive_read_next_header(a, &entry);
if (r == ARCHIVE_EOF)
{
break;
}
if (r < ARCHIVE_OK)
{
printf("%s\n", archive_error_string(a));
}
if (r < ARCHIVE_WARN)
{
return;
}
r = archive_write_header(ext, entry);
if (r < ARCHIVE_OK)
{
printf("%s\n", archive_error_string(ext));
}
else if (archive_entry_size(entry) > 0)
{
r = copy_data(a, ext);
if (r < ARCHIVE_OK)
printf("%s\n", archive_error_string(ext));
if (r < ARCHIVE_WARN)
return;
}
r = archive_write_finish_entry(ext);
if (r < ARCHIVE_OK)
printf("%s\n", archive_error_string(ext));
if (r < ARCHIVE_WARN)
return;
}
archive_read_close(a);
archive_read_free(a);
archive_write_close(ext);
archive_write_free(ext);
if (err) chdir(cwd);
}
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