zip_file_get_offset.c File Reference

#include <stdio.h>
#include <string.h>
#include "zipint.h"

Go to the source code of this file.

Functions
zip_uint64_t	_zip_file_get_offset (const zip_t *za, zip_uint64_t idx, zip_error_t *error)
zip_uint64_t	_zip_file_get_end (const zip_t *za, zip_uint64_t index, zip_error_t *error)

Function Documentation

_zip_file_get_end()

zip_uint64_t _zip_file_get_end	(	const zip_t *	za,
		zip_uint64_t	index,
		zip_error_t *	error
	)

Definition at line 77 of file zip_file_get_offset.c.

                                                                           {
    zip_uint64_t offset;
    zip_dirent_t *entry;
 
    if ((offset = _zip_file_get_offset(za, index, error)) == 0) {
        return 0;
    }
 
    entry = za->entry[index].orig;
 
    if (offset + entry->comp_size < offset || offset + entry->comp_size > ZIP_INT64_MAX) {
        zip_error_set(error, ZIP_ER_SEEK, EFBIG);
        return 0;
    }
    offset += entry->comp_size;
 
    if (entry->bitflags & ZIP_GPBF_DATA_DESCRIPTOR) {
        zip_uint8_t buf[4];
        if (zip_source_seek(za->src, (zip_int64_t)offset, SEEK_SET) < 0) {
            _zip_error_set_from_source(error, za->src);
            return 0;
        }
        if (zip_source_read(za->src, buf, 4) != 4) {
            _zip_error_set_from_source(error, za->src);
            return 0;
        }
        if (memcmp(buf, DATADES_MAGIC, 4) == 0) {
            offset += 4;
        }
        offset += 12;
        if (_zip_dirent_needs_zip64(entry, 0)) {
            offset += 8;
        }
        if (offset > ZIP_INT64_MAX) {
            zip_error_set(error, ZIP_ER_SEEK, EFBIG);
            return 0;
        }
    }
 
    return offset;
}

References _zip_dirent_needs_zip64(), _zip_error_set_from_source(), _zip_file_get_offset(), DATADES_MAGIC, EFBIG, zip::entry, error(), zip_entry::orig, SEEK_SET, zip::src, za, ZIP_ER_SEEK, zip_error_set(), ZIP_GPBF_DATA_DESCRIPTOR, ZIP_INT64_MAX, zip_source_read(), and zip_source_seek().

Referenced by zip_close().

_zip_file_get_offset()

zip_uint64_t _zip_file_get_offset	(	const zip_t *	za,
		zip_uint64_t	idx,
		zip_error_t *	error
	)

Definition at line 48 of file zip_file_get_offset.c.

                                                                            {
    zip_uint64_t offset;
    zip_int32_t size;
 
    if (za->entry[idx].orig == NULL) {
        zip_error_set(error, ZIP_ER_INTERNAL, 0);
        return 0;
    }
 
    offset = za->entry[idx].orig->offset;
 
    if (zip_source_seek(za->src, (zip_int64_t)offset, SEEK_SET) < 0) {
        _zip_error_set_from_source(error, za->src);
        return 0;
    }
 
    /* TODO: cache? */
    if ((size = _zip_dirent_size(za->src, ZIP_EF_LOCAL, error)) < 0)
        return 0;
 
    if (offset + (zip_uint32_t)size > ZIP_INT64_MAX) {
        zip_error_set(error, ZIP_ER_SEEK, EFBIG);
        return 0;
    }
 
    return offset + (zip_uint32_t)size;
}

References _zip_dirent_size(), _zip_error_set_from_source(), EFBIG, zip::entry, error(), setup::idx, NULL, zip_dirent::offset, zip_entry::orig, SEEK_SET, zip::src, za, ZIP_EF_LOCAL, ZIP_ER_INTERNAL, ZIP_ER_SEEK, zip_error_set(), ZIP_INT64_MAX, and zip_source_seek().

Referenced by _zip_file_get_end(), window_read(), and zip_close().