91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
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/*
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zip_source_read.c -- read data from zip_source
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Copyright (C) 2009-2017 Dieter Baron and Thomas Klausner
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This file is part of libzip, a library to manipulate ZIP archives.
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The authors can be contacted at <libzip@nih.at>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. The names of the authors may not be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "zipint.h"
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zip_int64_t
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zip_source_read(zip_source_t *src, void *data, zip_uint64_t len) {
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zip_uint64_t bytes_read;
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zip_int64_t n;
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if (src->source_closed) {
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return -1;
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}
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if (!ZIP_SOURCE_IS_OPEN_READING(src) || len > ZIP_INT64_MAX || (len > 0 && data == NULL)) {
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zip_error_set(&src->error, ZIP_ER_INVAL, 0);
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return -1;
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}
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if (src->had_read_error) {
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return -1;
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}
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if (_zip_source_eof(src)) {
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return 0;
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}
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if (len == 0) {
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return 0;
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}
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bytes_read = 0;
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while (bytes_read < len) {
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if ((n = _zip_source_call(src, (zip_uint8_t *)data + bytes_read, len - bytes_read, ZIP_SOURCE_READ)) < 0) {
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src->had_read_error = true;
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if (bytes_read == 0) {
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return -1;
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}
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else {
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return (zip_int64_t)bytes_read;
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}
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}
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if (n == 0) {
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src->eof = 1;
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break;
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}
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bytes_read += (zip_uint64_t)n;
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}
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return (zip_int64_t)bytes_read;
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}
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bool
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_zip_source_eof(zip_source_t *src) {
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return src->eof;
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}
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