// make buffer with 32/64 bit Data Descriptor chunk, this follows files with incomplete headers
ngx_chain_t*
ngx_http_zip_data_descriptor_chain_link(ngx_http_request_t *r, ngx_http_zip_piece_t *piece, ngx_http_zip_range_t *range)
{
ngx_chain_t *link;
ngx_buf_t *b;
ngx_http_zip_file_t *file = piece->file;
size_t struct_size = file->need_zip64? sizeof(ngx_zip_data_descriptor_zip64_t) : sizeof(ngx_zip_data_descriptor_t);
union {
ngx_zip_data_descriptor_t descriptor;
ngx_zip_data_descriptor_zip64_t descriptor64;
} data;
if ((link = ngx_alloc_chain_link(r->pool)) == NULL || (b = ngx_calloc_buf(r->pool)) == NULL
|| (b->pos = ngx_palloc(r->pool, struct_size)) == NULL)
return NULL;
b->memory = 1;
b->last = b->pos + struct_size;
if (!file->need_zip64) {
data.descriptor = ngx_zip_data_descriptor_template;
data.descriptor.signature = htole32(data.descriptor.signature);
data.descriptor.crc32 = htole32(file->crc32);
data.descriptor.compressed_size = data.descriptor.uncompressed_size = htole32(file->size);
} else {
data.descriptor64 = ngx_zip_data_descriptor_zip64_template;
data.descriptor64.signature = htole32(data.descriptor64.signature);
data.descriptor64.crc32 = htole32(file->crc32);
data.descriptor64.compressed_size = data.descriptor64.uncompressed_size = htole64(file->size);
}
ngx_memcpy(b->pos, &data, struct_size);
ngx_http_zip_truncate_buffer(b, &piece->range, range);
link->buf = b;
link->next = NULL;
return link;
}
//make archive footer: Central Directory, Zip64 Central Directory End, Zip64 locator and Central Directory end chunks
ngx_chain_t *
ngx_http_zip_central_directory_chain_link(ngx_http_request_t *r, ngx_http_zip_ctx_t *ctx, ngx_http_zip_piece_t *piece, ngx_http_zip_range_t *range)
{
//nb: this is to be called only after 'generate pieces'
ngx_chain_t *trailer;
ngx_buf_t *trailer_buf;
u_char *p;
off_t cd_size;
ngx_uint_t i;
ngx_array_t *files;
ngx_zip_end_of_central_directory_record_t eocdr;
ngx_zip_zip64_end_of_central_directory_record_t eocdr64;
ngx_zip_zip64_end_of_central_directory_locator_t locator64;
if (!ctx || !ctx->cd_size || (trailer = ngx_alloc_chain_link(r->pool)) == NULL
|| (trailer_buf = ngx_calloc_buf(r->pool)) == NULL
|| (p = ngx_palloc(r->pool, ctx->cd_size)) == NULL)
return NULL;
files = &ctx->files;
trailer->buf = trailer_buf;
trailer->next = NULL;
trailer_buf->pos = p;
trailer_buf->last = p + ctx->cd_size;
trailer_buf->last_buf = 1;
trailer_buf->sync = 1;
trailer_buf->memory = 1;
for (i = 0; i < files->nelts; i++)
p = ngx_http_zip_write_central_directory_entry(p, &((ngx_http_zip_file_t *)files->elts)[i], ctx);
eocdr = ngx_zip_end_of_central_directory_record_template;
eocdr.signature = htole32(eocdr.signature);
if (files->nelts < NGX_MAX_UINT16_VALUE) {
eocdr.disk_entries_n = htole16(files->nelts);
eocdr.entries_n = htole16(files->nelts);
}
cd_size = ctx->cd_size - sizeof(ngx_zip_end_of_central_directory_record_t)
- (!!ctx->zip64_used)*(sizeof(ngx_zip_zip64_end_of_central_directory_record_t)
+ sizeof(ngx_zip_zip64_end_of_central_directory_locator_t));
if (cd_size < (off_t) NGX_MAX_UINT32_VALUE)
eocdr.size = htole32(cd_size);
if (piece->range.start < (off_t) NGX_MAX_UINT32_VALUE)
eocdr.offset = htole32(piece->range.start);
if (ctx->zip64_used) {
eocdr64 = ngx_zip_zip64_end_of_central_directory_record_template;
eocdr64.signature = htole32(eocdr64.signature);
eocdr64.size = htole64(eocdr64.size);
eocdr64.version_made_by = htole16(eocdr64.version_made_by);
eocdr64.version_needed = htole16(eocdr64.version_made_by);
eocdr64.cd_n_entries_on_this_disk = eocdr64.cd_n_entries_total = htole64(files->nelts);
eocdr64.cd_size = htole64(cd_size);
eocdr64.cd_offset = htole64(piece->range.start);
ngx_memcpy(p, &eocdr64, sizeof(ngx_zip_zip64_end_of_central_directory_record_t));
p += sizeof(ngx_zip_zip64_end_of_central_directory_record_t);
locator64 = ngx_zip_zip64_end_of_central_directory_locator_template;
locator64.signature = htole32(locator64.signature);
locator64.disks_total_n = htole32(locator64.disks_total_n);
locator64.cd_relative_offset = htole64(piece->range.start + cd_size);
ngx_memcpy(p, &locator64, sizeof(ngx_zip_zip64_end_of_central_directory_locator_t));
p += sizeof(ngx_zip_zip64_end_of_central_directory_locator_t);
}
ngx_memcpy(p, &eocdr, sizeof(ngx_zip_end_of_central_directory_record_t));
ngx_http_zip_truncate_buffer(trailer->buf, &piece->range, range);
return trailer;
}
// make Local File Header chunk with extra fields
ngx_chain_t*
ngx_http_zip_file_header_chain_link(ngx_http_request_t *r, ngx_http_zip_ctx_t *ctx,
ngx_http_zip_piece_t *piece, ngx_http_zip_range_t *range)
{
ngx_chain_t *link;
ngx_buf_t *b;
ngx_http_zip_file_t *file = piece->file;
ngx_zip_extra_field_local_t extra_field_local;
ngx_zip_extra_field_zip64_sizes_only_t extra_field_zip64;
ngx_zip_local_file_header_t local_file_header;
ngx_zip_extra_field_unicode_path_t extra_field_unicode_path;
size_t len = sizeof(ngx_zip_local_file_header_t) + file->filename.len
+ sizeof(ngx_zip_extra_field_local_t) + (file->need_zip64? sizeof(ngx_zip_extra_field_zip64_sizes_only_t):0
+ (ctx->unicode_path && file->filename_utf8.len ? (sizeof(ngx_zip_extra_field_unicode_path_t) + file->filename_utf8.len): 0));
if ((link = ngx_alloc_chain_link(r->pool)) == NULL || (b = ngx_calloc_buf(r->pool)) == NULL
|| (b->pos = ngx_pcalloc(r->pool, len)) == NULL)
return NULL;
b->memory = 1;
b->last = b->pos + len;
/* A note about the ZIP format: in order to appease all ZIP software I
* could find, the local file header contains the file sizes but not the
* CRC-32, even though setting the third bit of the general purpose bit
* flag would indicate that all three fields should be zeroed out.
*/
local_file_header = ngx_zip_local_file_header_template;
local_file_header.signature = htole32(local_file_header.signature);
local_file_header.version = htole16(local_file_header.version);
local_file_header.flags = htole16(local_file_header.flags);
local_file_header.mtime = htole32(file->dos_time);
local_file_header.filename_len = htole16(file->filename.len);
if (ctx->native_charset) {
local_file_header.flags &= htole16(~zip_utf8_flag);
}
extra_field_zip64 = ngx_zip_extra_field_zip64_sizes_only_template;
extra_field_zip64.tag = htole16(extra_field_zip64.tag);
extra_field_zip64.size = htole16(extra_field_zip64.size);
if (file->need_zip64) {
local_file_header.version = htole16(zip_version_zip64);
local_file_header.extra_field_len = sizeof(ngx_zip_extra_field_zip64_sizes_only_t) + sizeof(ngx_zip_extra_field_local_t);
extra_field_zip64.uncompressed_size = extra_field_zip64.compressed_size = htole64(file->size);
} else {
local_file_header.compressed_size = htole32(file->size);
local_file_header.uncompressed_size = htole32(file->size);
}
extra_field_unicode_path = ngx_zip_extra_field_unicode_path_template;
extra_field_unicode_path.tag = htole16(extra_field_unicode_path.tag);
if (ctx->unicode_path && file->filename_utf8.len) {
extra_field_unicode_path.crc32 = htole32(file->filename_utf8_crc32);
extra_field_unicode_path.size = htole16(sizeof(ngx_zip_extra_field_unicode_path_t) + file->filename_utf8.len);
local_file_header.extra_field_len += sizeof(ngx_zip_extra_field_unicode_path_t) + file->filename_utf8.len;
}
local_file_header.extra_field_len = htole16(local_file_header.extra_field_len);
if (!file->missing_crc32) {
local_file_header.flags &= htole16(~zip_missing_crc32_flag);
local_file_header.crc32 = htole32(file->crc32);
}
extra_field_local = ngx_zip_extra_field_local_template;
extra_field_local.tag = htole16(extra_field_local.tag);
extra_field_local.size = htole16(extra_field_local.size);
extra_field_local.mtime = htole32(file->unix_time);
extra_field_local.atime = htole32(file->unix_time);
ngx_memcpy(b->pos, &local_file_header, sizeof(ngx_zip_local_file_header_t));
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t), file->filename.data, file->filename.len);
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t) + file->filename.len,
&extra_field_local, sizeof(ngx_zip_extra_field_local_t));
if (file->need_zip64) {
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t) + file->filename.len + sizeof(ngx_zip_extra_field_local_t),
&extra_field_zip64, sizeof(ngx_zip_extra_field_zip64_sizes_only_t));
if (ctx->unicode_path && file->filename_utf8.len) {
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t) + file->filename.len + sizeof(ngx_zip_extra_field_local_t) + sizeof(ngx_zip_extra_field_zip64_sizes_only_t), &extra_field_unicode_path, sizeof(ngx_zip_extra_field_unicode_path_t));
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t) + file->filename.len + sizeof(ngx_zip_extra_field_local_t) + sizeof(ngx_zip_extra_field_zip64_sizes_only_t) + sizeof(ngx_zip_extra_field_unicode_path_t), file->filename_utf8.data, file->filename_utf8.len);
}
} else if (ctx->unicode_path && file->filename_utf8.len) {
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t) + file->filename.len + sizeof(ngx_zip_extra_field_local_t), &extra_field_unicode_path, sizeof(ngx_zip_extra_field_unicode_path_t));
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t) + file->filename.len + sizeof(ngx_zip_extra_field_local_t) + sizeof(ngx_zip_extra_field_unicode_path_t), file->filename_utf8.data, file->filename_utf8.len);
}
ngx_http_zip_truncate_buffer(b, &piece->range, range);
link->buf = b;
link->next = NULL;
return link;
}
// make Local File Header chunk with extra fields
ngx_chain_t*
ngx_http_zip_file_header_chain_link(ngx_http_request_t *r, ngx_http_zip_ctx_t *ctx,
ngx_http_zip_piece_t *piece, ngx_http_zip_range_t *range)
{
ngx_chain_t *link;
ngx_buf_t *b;
ngx_http_zip_file_t *file = piece->file;
ngx_zip_extra_field_local_t extra_field_local;
ngx_zip_extra_field_zip64_sizes_only_t extra_field_zip64;
ngx_zip_local_file_header_t local_file_header;
size_t len = sizeof(ngx_zip_local_file_header_t) + file->filename.len
+ sizeof(ngx_zip_extra_field_local_t) + (file->need_zip64? sizeof(ngx_zip_extra_field_zip64_sizes_only_t):0);
if ((link = ngx_alloc_chain_link(r->pool)) == NULL || (b = ngx_calloc_buf(r->pool)) == NULL
|| (b->pos = ngx_pcalloc(r->pool, len)) == NULL)
return NULL;
b->memory = 1;
b->last = b->pos + len;
file->unix_time = time(NULL);
file->dos_time = ngx_dos_time(file->unix_time);
/* A note about the ZIP format: in order to appease all ZIP software I
* could find, the local file header contains the file sizes but not the
* CRC-32, even though setting the third bit of the general purpose bit
* flag would indicate that all three fields should be zeroed out.
*/
local_file_header = ngx_zip_local_file_header_template;
local_file_header.mtime = file->dos_time;
local_file_header.filename_len = file->filename.len;
if (file->need_zip64) {
local_file_header.version = zip_version_zip64;
local_file_header.extra_field_len = sizeof(ngx_zip_extra_field_zip64_sizes_only_t) + sizeof(ngx_zip_extra_field_local_t);
extra_field_zip64 = ngx_zip_extra_field_zip64_sizes_only_template;
extra_field_zip64.uncompressed_size = extra_field_zip64.compressed_size = file->size;
} else {
local_file_header.compressed_size = file->size;
local_file_header.uncompressed_size = file->size;
}
if (!file->missing_crc32) {
local_file_header.flags &= ~zip_missing_crc32_flag;
local_file_header.crc32 = file->crc32;
}
extra_field_local = ngx_zip_extra_field_local_template;
extra_field_local.mtime = file->unix_time;
extra_field_local.atime = file->unix_time;
ngx_memcpy(b->pos, &local_file_header, sizeof(ngx_zip_local_file_header_t));
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t), file->filename.data, file->filename.len);
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t) + file->filename.len,
&extra_field_local, sizeof(ngx_zip_extra_field_local_t));
if (file->need_zip64)
ngx_memcpy(b->pos + sizeof(ngx_zip_local_file_header_t) + file->filename.len + sizeof(ngx_zip_extra_field_local_t),
&extra_field_zip64, sizeof(ngx_zip_extra_field_zip64_sizes_only_t));
ngx_http_zip_truncate_buffer(b, &piece->range, range);
link->buf = b;
link->next = NULL;
return link;
}
