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-rw-r--r--src/Common/libzip/zip_source_window.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_source_window.c b/src/Common/libzip/zip_source_window.c
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+++ b/src/Common/libzip/zip_source_window.c
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+/*
+ zip_source_window.c -- return part of lower source
+ Copyright (C) 2012-2014 Dieter Baron and Thomas Klausner
+
+ This file is part of libzip, a library to manipulate ZIP archives.
+ The authors can be contacted at <libzip@nih.at>
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ 3. The names of the authors may not be used to endorse or promote
+ products derived from this software without specific prior
+ written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+ OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "zipint.h"
+
+struct window {
+ zip_uint64_t start;
+ zip_uint64_t end;
+ zip_uint64_t offset;
+ zip_stat_t stat;
+ zip_error_t error;
+ zip_int64_t supports;
+ bool needs_seek;
+};
+
+static zip_int64_t window_read(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t);
+
+
+zip_source_t *
+zip_source_window(zip_t *za, zip_source_t *src, zip_uint64_t start, zip_uint64_t len)
+{
+ return _zip_source_window_new(src, start, len, NULL, &za->error);
+}
+
+
+zip_source_t *
+_zip_source_window_new(zip_source_t *src, zip_uint64_t start, zip_uint64_t length, zip_stat_t *st, zip_error_t *error)
+{
+ struct window *ctx;
+
+ if (src == NULL || start + length < start) {
+ zip_error_set(error, ZIP_ER_INVAL, 0);
+ return NULL;
+ }
+
+ if ((ctx=(struct window *)malloc(sizeof(*ctx))) == NULL) {
+ zip_error_set(error, ZIP_ER_MEMORY, 0);
+ return NULL;
+ }
+
+ ctx->start = start;
+ ctx->end = start + length;
+ zip_stat_init(&ctx->stat);
+ zip_error_init(&ctx->error);
+ ctx->supports = (zip_source_supports(src) & ZIP_SOURCE_SUPPORTS_SEEKABLE) | (zip_source_make_command_bitmap(ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, -1));
+ ctx->needs_seek = (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_SEEK)) ? true : false;
+
+ if (st) {
+ if (_zip_stat_merge(&ctx->stat, st, error) < 0) {
+ free(ctx);
+ return NULL;
+ }
+ }
+
+ return zip_source_layered_create(src, window_read, ctx, error);
+}
+
+
+int
+_zip_source_set_source_archive(zip_source_t *src, zip_t *za)
+{
+ src->source_archive = za;
+ return _zip_register_source(za, src);
+}
+
+
+/* called by zip_discard to avoid operating on file from closed archive */
+void
+_zip_source_invalidate(zip_source_t *src)
+{
+ src->source_closed = 1;
+
+ if (zip_error_code_zip(&src->error) == ZIP_ER_OK) {
+ zip_error_set(&src->error, ZIP_ER_ZIPCLOSED, 0);
+ }
+}
+
+
+static zip_int64_t
+window_read(zip_source_t *src, void *_ctx, void *data, zip_uint64_t len, zip_source_cmd_t cmd)
+{
+ struct window *ctx;
+ zip_int64_t ret;
+ zip_uint64_t n, i;
+ char b[8192];
+
+ ctx = (struct window *)_ctx;
+
+ switch (cmd) {
+ case ZIP_SOURCE_CLOSE:
+ return 0;
+
+ case ZIP_SOURCE_ERROR:
+ return zip_error_to_data(&ctx->error, data, len);
+
+ case ZIP_SOURCE_FREE:
+ free(ctx);
+ return 0;
+
+ case ZIP_SOURCE_OPEN:
+ if (!ctx->needs_seek) {
+ for (n=0; n<ctx->start; n+=(zip_uint64_t)ret) {
+ i = (ctx->start-n > sizeof(b) ? sizeof(b) : ctx->start-n);
+ if ((ret=zip_source_read(src, b, i)) < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ return -1;
+ }
+ if (ret==0) {
+ zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
+ return -1;
+ }
+ }
+
+ }
+ ctx->offset = ctx->start;
+ return 0;
+
+ case ZIP_SOURCE_READ:
+ if (len > ctx->end - ctx->offset)
+ len = ctx->end - ctx->offset;
+
+ if (len == 0)
+ return 0;
+
+ if (ctx->needs_seek) {
+ if (zip_source_seek(src, (zip_int64_t)ctx->offset, SEEK_SET) < 0) {
+ _zip_error_set_from_source(&ctx->error, src);
+ return -1;
+ }
+ }
+
+ if ((ret=zip_source_read(src, data, len)) < 0) {
+ zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
+ return -1;
+ }
+
+ ctx->offset += (zip_uint64_t)ret;
+
+ if (ret == 0) {
+ if (ctx->offset < ctx->end) {
+ zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
+ return -1;
+ }
+ }
+ return ret;
+
+ case ZIP_SOURCE_SEEK:
+ {
+ zip_int64_t new_offset = zip_source_seek_compute_offset(ctx->offset - ctx->start, ctx->end - ctx->start, data, len, &ctx->error);
+
+ if (new_offset < 0) {
+ return -1;
+ }
+
+ ctx->offset = (zip_uint64_t)new_offset + ctx->start;
+ return 0;
+ }
+
+ case ZIP_SOURCE_STAT:
+ {
+ zip_stat_t *st;
+
+ st = (zip_stat_t *)data;
+
+ if (_zip_stat_merge(st, &ctx->stat, &ctx->error) < 0) {
+ return -1;
+ }
+ return 0;
+ }
+
+ case ZIP_SOURCE_SUPPORTS:
+ return ctx->supports;
+
+ case ZIP_SOURCE_TELL:
+ return (zip_int64_t)(ctx->offset - ctx->start);
+
+ default:
+ zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0);
+ return -1;
+ }
+}
+
+
+void
+_zip_deregister_source(zip_t *za, zip_source_t *src)
+{
+ unsigned int i;
+
+ for (i=0; i<za->nopen_source; i++) {
+ if (za->open_source[i] == src) {
+ za->open_source[i] = za->open_source[za->nopen_source-1];
+ za->nopen_source--;
+ break;
+ }
+ }
+}
+
+
+int
+_zip_register_source(zip_t *za, zip_source_t *src)
+{
+ zip_source_t **open_source;
+
+ if (za->nopen_source+1 >= za->nopen_source_alloc) {
+ unsigned int n;
+ n = za->nopen_source_alloc + 10;
+ open_source = (zip_source_t **)realloc(za->open_source, n*sizeof(zip_source_t *));
+ if (open_source == NULL) {
+ zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
+ return -1;
+ }
+ za->nopen_source_alloc = n;
+ za->open_source = open_source;
+ }
+
+ za->open_source[za->nopen_source++] = src;
+
+ return 0;
+}