162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/*
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zip_source_buffer.c -- create zip data source from buffer
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Copyright (C) 1999-2009 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 <stdlib.h>
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#include <string.h>
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#include "zipint.h"
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struct read_data {
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const char *buf, *data, *end;
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time_t mtime;
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int freep;
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};
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static zip_int64_t read_data(void *, void *, zip_uint64_t, enum zip_source_cmd);
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ZIP_EXTERN struct zip_source *
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zip_source_buffer(struct zip *za, const void *data, zip_uint64_t len, int freep)
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{
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struct read_data *f;
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struct zip_source *zs;
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if (za == NULL)
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return NULL;
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if (data == NULL && len > 0) {
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_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
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return NULL;
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}
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if ((f=(struct read_data *)malloc(sizeof(*f))) == NULL) {
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_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
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return NULL;
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}
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f->data = (const char *)data;
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f->end = ((const char *)data)+len;
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f->freep = freep;
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f->mtime = time(NULL);
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if ((zs=zip_source_function(za, read_data, f)) == NULL) {
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free(f);
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return NULL;
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}
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return zs;
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}
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static zip_int64_t
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read_data(void *state, void *data, zip_uint64_t len, enum zip_source_cmd cmd)
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{
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struct read_data *z;
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char *buf;
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zip_uint64_t n;
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z = (struct read_data *)state;
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buf = (char *)data;
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switch (cmd) {
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case ZIP_SOURCE_OPEN:
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z->buf = z->data;
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return 0;
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case ZIP_SOURCE_READ:
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n = (zip_uint64_t)(z->end - z->buf);
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if (n > len)
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n = len;
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if (n) {
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memcpy(buf, z->buf, n);
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z->buf += n;
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}
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return (zip_int64_t)n;
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case ZIP_SOURCE_CLOSE:
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return 0;
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case ZIP_SOURCE_STAT:
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{
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struct zip_stat *st;
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if (len < sizeof(*st))
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return -1;
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st = (struct zip_stat *)data;
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zip_stat_init(st);
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st->mtime = z->mtime;
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st->size = (zip_uint64_t)(z->end - z->data);
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st->comp_size = st->size;
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st->comp_method = ZIP_CM_STORE;
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st->encryption_method = ZIP_EM_NONE;
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st->valid = ZIP_STAT_MTIME|ZIP_STAT_SIZE|ZIP_STAT_COMP_SIZE
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|ZIP_STAT_COMP_METHOD|ZIP_STAT_ENCRYPTION_METHOD;
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return sizeof(*st);
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}
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case ZIP_SOURCE_ERROR:
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{
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int *e;
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if (len < sizeof(int)*2)
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return -1;
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e = (int *)data;
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e[0] = e[1] = 0;
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}
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return sizeof(int)*2;
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case ZIP_SOURCE_FREE:
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if (z->freep) {
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free((void *)z->data);
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z->data = NULL;
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}
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free(z);
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return 0;
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default:
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;
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}
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return -1;
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}
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