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98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
#include "pixz.h"
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#include <archive.h>
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#include <archive_entry.h>
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#include <sys/errno.h>
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#define CHUNKSIZE 4096
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#define INDEXFILE "index.xz"
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typedef struct {
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FILE *file;
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uint8_t buf[CHUNKSIZE];
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} pixz_tar;
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static int pixz_tar_open(struct archive *a, void *refp);
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static int pixz_tar_close(struct archive *a, void *refp);
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static ssize_t pixz_tar_read(struct archive *a, void *refp, const void **buf);
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#include <string.h>
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int main(void) {
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pixz_index *index = pixz_index_new();
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struct archive *a = archive_read_new();
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archive_read_support_compression_none(a);
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archive_read_support_format_tar(a);
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FILE *infile = stdin;
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pixz_tar input = { .file = infile };
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if (archive_read_open(a, &input, pixz_tar_open, pixz_tar_read,
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pixz_tar_close) != ARCHIVE_OK)
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pixz_die("Can't open archive\n");
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while (1) {
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struct archive_entry *entry;
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int aerr = archive_read_next_header(a, &entry);
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if (aerr == ARCHIVE_EOF) {
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pixz_index_finish(index, ftello(stdin));
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break;
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} else if (aerr != ARCHIVE_OK && aerr != ARCHIVE_WARN) {
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// libarchive warns for silly things like failure to convert
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// names into multibyte strings
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pixz_die("Error reading header: %s\n", archive_error_string(a));
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}
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const char *name = archive_entry_pathname(entry);
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size_t offset = archive_read_header_position(a);
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pixz_index_add(index, offset, name);
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if (archive_read_data_skip(a) != ARCHIVE_OK)
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pixz_die("Error skipping data\n");
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}
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if (archive_read_finish(a) != ARCHIVE_OK)
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pixz_die("Error finishing read\n");
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FILE *ifile = fopen(INDEXFILE, "w+");
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if (!ifile)
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pixz_die("Can't open index file\n");
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pixz_encode_options *opts = pixz_encode_options_new();
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pixz_encode_options_default(opts);
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pixz_index_write(index, ifile, opts);
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pixz_index_free(index);
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lzma_check check = opts->check;
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pixz_encode_options_free(opts);
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fseek(ifile, 0, SEEK_SET);
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pixz_index *i2;
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pixz_index_read_in_place(&i2, ifile, check);
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fclose(ifile);
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pixz_index_dump(i2, stdout);
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pixz_index_free(i2);
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return 0;
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}
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static int pixz_tar_open(struct archive *a, void *refp) {
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return ARCHIVE_OK;
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}
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static int pixz_tar_close(struct archive *a, void *refp) {
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fclose(((pixz_tar*)refp)->file);
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return ARCHIVE_OK;
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}
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static ssize_t pixz_tar_read(struct archive *a, void *refp, const void **buf) {
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pixz_tar *input = (pixz_tar*)refp;
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size_t rd = fread(input->buf, 1, CHUNKSIZE, input->file);
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if (ferror(input->file)) {
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archive_set_error(a, errno, "Read error");
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return -1;
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}
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*buf = input->buf;
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return rd;
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}
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