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/*
zip_source_file_stdio.c -- read-only stdio file source implementation
Copyright (C) 2020 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <info@libzip.org>
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 "zipint.h"
#include "zip_source_file.h"
#include "zip_source_file_stdio.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#ifdef _WIN32
#ifndef S_IWUSR
#define S_IWUSR _S_IWRITE
#endif
#endif
/* clang-format off */
static zip_source_file_operations_t ops_stdio_read = {
_zip_stdio_op_close,
NULL,
NULL,
NULL,
NULL,
_zip_stdio_op_read,
NULL,
NULL,
_zip_stdio_op_seek,
_zip_stdio_op_stat,
NULL,
_zip_stdio_op_tell,
NULL
};
/* clang-format on */
ZIP_EXTERN zip_source_t *
zip_source_filep(zip_t *za, FILE *file, zip_uint64_t start, zip_int64_t len) {
if (za == NULL) {
return NULL;
}
return zip_source_filep_create(file, start, len, &za->error);
}
ZIP_EXTERN zip_source_t *
zip_source_filep_create(FILE *file, zip_uint64_t start, zip_int64_t length, zip_error_t *error) {
if (file == NULL || length < ZIP_LENGTH_UNCHECKED) {
zip_error_set(error, ZIP_ER_INVAL, 0);
return NULL;
}
return zip_source_file_common_new(NULL, file, start, length, NULL, &ops_stdio_read, NULL, error);
}
void
_zip_stdio_op_close(zip_source_file_context_t *ctx) {
fclose((FILE *)ctx->f);
}
zip_int64_t
_zip_stdio_op_read(zip_source_file_context_t *ctx, void *buf, zip_uint64_t len) {
size_t i;
if (len > SIZE_MAX) {
len = SIZE_MAX;
}
if ((i = fread(buf, 1, (size_t)len, ctx->f)) == 0) {
if (ferror((FILE *)ctx->f)) {
zip_error_set(&ctx->error, ZIP_ER_READ, errno);
return -1;
}
}
return (zip_int64_t)i;
}
bool
_zip_stdio_op_seek(zip_source_file_context_t *ctx, void *f, zip_int64_t offset, int whence) {
#if ZIP_FSEEK_MAX > ZIP_INT64_MAX
if (offset > ZIP_FSEEK_MAX || offset < ZIP_FSEEK_MIN) {
zip_error_set(&ctx->error, ZIP_ER_SEEK, EOVERFLOW);
return false;
}
#endif
if (fseeko((FILE *)f, (off_t)offset, whence) < 0) {
zip_error_set(&ctx->error, ZIP_ER_SEEK, errno);
return false;
}
return true;
}
bool
_zip_stdio_op_stat(zip_source_file_context_t *ctx, zip_source_file_stat_t *st) {
struct stat sb;
int ret;
if (ctx->fname) {
ret = stat(ctx->fname, &sb);
}
else {
ret = fstat(fileno((FILE *)ctx->f), &sb);
}
if (ret < 0) {
if (errno == ENOENT) {
st->exists = false;
return true;
}
zip_error_set(&ctx->error, ZIP_ER_READ, errno);
return false;
}
st->size = (zip_uint64_t)sb.st_size;
st->mtime = sb.st_mtime;
st->regular_file = S_ISREG(sb.st_mode);
st->exists = true;
/* We're using UNIX file API, even on Windows; thus, we supply external file attributes with Unix values. */
/* TODO: This could be improved on Windows by providing Windows-specific file attributes */
ctx->attributes.valid = ZIP_FILE_ATTRIBUTES_HOST_SYSTEM | ZIP_FILE_ATTRIBUTES_EXTERNAL_FILE_ATTRIBUTES;
ctx->attributes.host_system = ZIP_OPSYS_UNIX;
ctx->attributes.external_file_attributes = (((zip_uint32_t)sb.st_mode) << 16) | ((sb.st_mode & S_IWUSR) ? 0 : 1);
return true;
}
zip_int64_t
_zip_stdio_op_tell(zip_source_file_context_t *ctx, void *f) {
off_t offset = ftello((FILE *)f);
if (offset < 0) {
zip_error_set(&ctx->error, ZIP_ER_SEEK, errno);
}
return offset;
}
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