blob: bd31a05259162c9b1723c97568cb2ad59ff36d51 [file] [log] [blame]
/*
zip_source_file_common.c -- create data source from file
Copyright (C) 1999-2019 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "zipint.h"
#include "zip_source_file.h"
static zip_int64_t read_file(void *state, void *data, zip_uint64_t len, zip_source_cmd_t cmd);
static void
zip_source_file_stat_init(zip_source_file_stat_t *st) {
st->size = 0;
st->mtime = time(NULL);
st->exists = false;
st->regular_file = false;
}
zip_source_t *
zip_source_file_common_new(const char *fname, void *file, zip_uint64_t start, zip_int64_t len, const zip_stat_t *st, zip_source_file_operations_t *ops, void *ops_userdata, zip_error_t *error) {
zip_source_file_context_t *ctx;
zip_source_t *zs;
zip_source_file_stat_t sb;
if (ops == NULL) {
zip_error_set(error, ZIP_ER_INVAL, 0);
return NULL;
}
if (ops->close == NULL || ops->read == NULL || ops->seek == NULL || ops->stat == NULL) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
return NULL;
}
if (ops->write != NULL && (ops->commit_write == NULL || ops->create_temp_output == NULL || ops->remove == NULL || ops->rollback_write == NULL || ops->tell == NULL)) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
return NULL;
}
if (fname != NULL) {
if (ops->open == NULL || ops->string_duplicate == NULL) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
return NULL;
}
}
else if (file == NULL) {
zip_error_set(error, ZIP_ER_INVAL, 0);
return NULL;
}
if (len < 0) {
len = 0;
}
if (start > ZIP_INT64_MAX || start + (zip_uint64_t)len < start) {
zip_error_set(error, ZIP_ER_INVAL, 0);
return NULL;
}
if ((ctx = (zip_source_file_context_t *)malloc(sizeof(zip_source_file_context_t))) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
ctx->ops = ops;
ctx->ops_userdata = ops_userdata;
ctx->fname = NULL;
if (fname) {
if ((ctx->fname = ops->string_duplicate(ctx, fname)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
free(ctx);
return NULL;
}
}
ctx->f = file;
ctx->start = start;
ctx->len = (zip_uint64_t)len;
if (st) {
memcpy(&ctx->st, st, sizeof(ctx->st));
ctx->st.name = NULL;
ctx->st.valid &= ~ZIP_STAT_NAME;
}
else {
zip_stat_init(&ctx->st);
}
if (ctx->len > 0) {
ctx->st.size = ctx->len;
ctx->st.valid |= ZIP_STAT_SIZE;
}
zip_error_init(&ctx->stat_error);
ctx->tmpname = NULL;
ctx->fout = NULL;
zip_error_init(&ctx->error);
zip_file_attributes_init(&ctx->attributes);
ctx->supports = ZIP_SOURCE_SUPPORTS_READABLE | zip_source_make_command_bitmap(ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, -1);
zip_source_file_stat_init(&sb);
if (!ops->stat(ctx, &sb)) {
_zip_error_copy(error, &ctx->error);
free(ctx->fname);
free(ctx);
return NULL;
}
if (!sb.exists) {
if (ctx->fname && ctx->start == 0 && ctx->len == 0 && ops->write != NULL) {
ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
/* zip_open_from_source checks for this to detect non-existing files */
zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
}
else {
zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
free(ctx->fname);
free(ctx);
return NULL;
}
}
else {
if ((ctx->st.valid & ZIP_STAT_MTIME) == 0) {
ctx->st.mtime = sb.mtime;
ctx->st.valid |= ZIP_STAT_MTIME;
}
if (sb.regular_file) {
ctx->supports = ZIP_SOURCE_SUPPORTS_SEEKABLE;
if (ctx->start + ctx->len > sb.size) {
zip_error_set(error, ZIP_ER_INVAL, 0);
free(ctx->fname);
free(ctx);
return NULL;
}
if (ctx->len == 0) {
ctx->len = sb.size - ctx->start;
ctx->st.size = ctx->len;
ctx->st.valid |= ZIP_STAT_SIZE;
/* when using a partial file, don't allow writing */
if (ctx->fname && start == 0 && ops->write != NULL) {
ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
}
}
}
ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_GET_FILE_ATTRIBUTES);
}
ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_ACCEPT_EMPTY);
if (ops->create_temp_output_cloning != NULL) {
if (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE)) {
ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE_CLONING);
}
}
if ((zs = zip_source_function_create(read_file, ctx, error)) == NULL) {
free(ctx->fname);
free(ctx);
return NULL;
}
return zs;
}
static zip_int64_t
read_file(void *state, void *data, zip_uint64_t len, zip_source_cmd_t cmd) {
zip_source_file_context_t *ctx;
char *buf;
ctx = (zip_source_file_context_t *)state;
buf = (char *)data;
switch (cmd) {
case ZIP_SOURCE_ACCEPT_EMPTY:
return 0;
case ZIP_SOURCE_BEGIN_WRITE:
/* write support should not be set if fname is NULL */
if (ctx->fname == NULL) {
zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
return -1;
}
return ctx->ops->create_temp_output(ctx);
case ZIP_SOURCE_BEGIN_WRITE_CLONING:
/* write support should not be set if fname is NULL */
if (ctx->fname == NULL) {
zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
return -1;
}
return ctx->ops->create_temp_output_cloning(ctx, len);
case ZIP_SOURCE_CLOSE:
if (ctx->fname) {
ctx->ops->close(ctx);
ctx->f = NULL;
}
return 0;
case ZIP_SOURCE_COMMIT_WRITE: {
zip_int64_t ret = ctx->ops->commit_write(ctx);
ctx->fout = NULL;
if (ret == 0) {
free(ctx->tmpname);
ctx->tmpname = NULL;
}
return ret;
}
case ZIP_SOURCE_ERROR:
return zip_error_to_data(&ctx->error, data, len);
case ZIP_SOURCE_FREE:
free(ctx->fname);
free(ctx->tmpname);
if (ctx->f) {
ctx->ops->close(ctx);
}
free(ctx);
return 0;
case ZIP_SOURCE_GET_FILE_ATTRIBUTES:
if (len < sizeof(ctx->attributes)) {
zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
return -1;
}
memcpy(data, &ctx->attributes, sizeof(ctx->attributes));
return sizeof(ctx->attributes);
case ZIP_SOURCE_OPEN:
if (ctx->fname) {
if (ctx->ops->open(ctx) == false) {
return -1;
}
}
if (ctx->start > 0) { // TODO: rewind on re-open
if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)ctx->start, SEEK_SET) == false) {
/* TODO: skip by reading */
return -1;
}
}
ctx->offset = 0;
return 0;
case ZIP_SOURCE_READ: {
zip_int64_t i;
zip_uint64_t n;
if (ctx->len > 0) {
n = ZIP_MIN(ctx->len - ctx->offset, len);
}
else {
n = len;
}
if ((i = ctx->ops->read(ctx, buf, n)) < 0) {
zip_error_set(&ctx->error, ZIP_ER_READ, errno);
return -1;
}
ctx->offset += (zip_uint64_t)i;
return i;
}
case ZIP_SOURCE_REMOVE:
return ctx->ops->remove(ctx);
case ZIP_SOURCE_ROLLBACK_WRITE:
ctx->ops->rollback_write(ctx);
ctx->fout = NULL;
free(ctx->tmpname);
ctx->tmpname = NULL;
return 0;
case ZIP_SOURCE_SEEK: {
zip_int64_t new_offset = zip_source_seek_compute_offset(ctx->offset, ctx->len, data, len, &ctx->error);
if (new_offset < 0) {
return -1;
}
/* The actual offset inside the file must be representable as zip_int64_t. */
if (new_offset > ZIP_INT64_MAX - (zip_int64_t)ctx->start) {
zip_error_set(&ctx->error, ZIP_ER_SEEK, EOVERFLOW);
return -1;
}
ctx->offset = (zip_uint64_t)new_offset;
if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)(ctx->offset + ctx->start), SEEK_SET) == false) {
return -1;
}
return 0;
}
case ZIP_SOURCE_SEEK_WRITE: {
zip_source_args_seek_t *args;
args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
if (args == NULL) {
return -1;
}
if (ctx->ops->seek(ctx, ctx->fout, args->offset, args->whence) == false) {
return -1;
}
return 0;
}
case ZIP_SOURCE_STAT: {
if (len < sizeof(ctx->st))
return -1;
if (zip_error_code_zip(&ctx->stat_error) != 0) {
zip_error_set(&ctx->error, zip_error_code_zip(&ctx->stat_error), zip_error_code_system(&ctx->stat_error));
return -1;
}
memcpy(data, &ctx->st, sizeof(ctx->st));
return sizeof(ctx->st);
}
case ZIP_SOURCE_SUPPORTS:
return ctx->supports;
case ZIP_SOURCE_TELL:
return (zip_int64_t)ctx->offset;
case ZIP_SOURCE_TELL_WRITE:
return ctx->ops->tell(ctx, ctx->fout);
case ZIP_SOURCE_WRITE:
return ctx->ops->write(ctx, data, len);
default:
zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0);
return -1;
}
}