Annotation of embedaddon/php/ext/zip/lib/zip_source_zip.c, revision 1.1
1.1 ! misho 1: /*
! 2: zip_source_zip.c -- create data source from zip file
! 3: Copyright (C) 1999-2007 Dieter Baron and Thomas Klausner
! 4:
! 5: This file is part of libzip, a library to manipulate ZIP archives.
! 6: The authors can be contacted at <libzip@nih.at>
! 7:
! 8: Redistribution and use in source and binary forms, with or without
! 9: modification, are permitted provided that the following conditions
! 10: are met:
! 11: 1. Redistributions of source code must retain the above copyright
! 12: notice, this list of conditions and the following disclaimer.
! 13: 2. Redistributions in binary form must reproduce the above copyright
! 14: notice, this list of conditions and the following disclaimer in
! 15: the documentation and/or other materials provided with the
! 16: distribution.
! 17: 3. The names of the authors may not be used to endorse or promote
! 18: products derived from this software without specific prior
! 19: written permission.
! 20:
! 21: THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
! 22: OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
! 23: WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 24: ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
! 25: DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 26: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
! 27: GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 28: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
! 29: IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
! 30: OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
! 31: IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 32: */
! 33:
! 34:
! 35:
! 36: #include <stdlib.h>
! 37: #include <string.h>
! 38:
! 39: #include "zipint.h"
! 40:
! 41: struct read_zip {
! 42: struct zip_file *zf;
! 43: struct zip_stat st;
! 44: off_t off, len;
! 45: };
! 46:
! 47: static ssize_t read_zip(void *st, void *data, size_t len,
! 48: enum zip_source_cmd cmd);
! 49:
! 50:
! 51:
! 52: ZIP_EXTERN(struct zip_source *)
! 53: zip_source_zip(struct zip *za, struct zip *srcza, int srcidx, int flags,
! 54: off_t start, off_t len)
! 55: {
! 56: struct zip_error error;
! 57: struct zip_source *zs;
! 58: struct read_zip *p;
! 59:
! 60: /* XXX: ZIP_FL_RECOMPRESS */
! 61:
! 62: if (za == NULL)
! 63: return NULL;
! 64:
! 65: if (srcza == NULL || start < 0 || len < -1 || srcidx < 0 || srcidx >= srcza->nentry) {
! 66: _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
! 67: return NULL;
! 68: }
! 69:
! 70: if ((flags & ZIP_FL_UNCHANGED) == 0
! 71: && ZIP_ENTRY_DATA_CHANGED(srcza->entry+srcidx)) {
! 72: _zip_error_set(&za->error, ZIP_ER_CHANGED, 0);
! 73: return NULL;
! 74: }
! 75:
! 76: if (len == 0)
! 77: len = -1;
! 78:
! 79: if (start == 0 && len == -1 && (flags & ZIP_FL_RECOMPRESS) == 0)
! 80: flags |= ZIP_FL_COMPRESSED;
! 81: else
! 82: flags &= ~ZIP_FL_COMPRESSED;
! 83:
! 84: if ((p=(struct read_zip *)malloc(sizeof(*p))) == NULL) {
! 85: _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
! 86: return NULL;
! 87: }
! 88:
! 89: _zip_error_copy(&error, &srcza->error);
! 90:
! 91: if (zip_stat_index(srcza, srcidx, flags, &p->st) < 0
! 92: || (p->zf=zip_fopen_index(srcza, srcidx, flags)) == NULL) {
! 93: free(p);
! 94: _zip_error_copy(&za->error, &srcza->error);
! 95: _zip_error_copy(&srcza->error, &error);
! 96:
! 97: return NULL;
! 98: }
! 99: p->off = start;
! 100: p->len = len;
! 101:
! 102: if ((flags & ZIP_FL_COMPRESSED) == 0) {
! 103: p->st.size = p->st.comp_size = len;
! 104: p->st.comp_method = ZIP_CM_STORE;
! 105: p->st.crc = 0;
! 106: }
! 107:
! 108: if ((zs=zip_source_function(za, read_zip, p)) == NULL) {
! 109: free(p);
! 110: return NULL;
! 111: }
! 112:
! 113: return zs;
! 114: }
! 115:
! 116:
! 117:
! 118: static ssize_t
! 119: read_zip(void *state, void *data, size_t len, enum zip_source_cmd cmd)
! 120: {
! 121: struct read_zip *z;
! 122: char b[8192], *buf;
! 123: int i, n;
! 124:
! 125: z = (struct read_zip *)state;
! 126: buf = (char *)data;
! 127:
! 128: switch (cmd) {
! 129: case ZIP_SOURCE_OPEN:
! 130: for (n=0; n<z->off; n+= i) {
! 131: i = (z->off-n > sizeof(b) ? sizeof(b) : z->off-n);
! 132: if ((i=zip_fread(z->zf, b, i)) < 0) {
! 133: zip_fclose(z->zf);
! 134: z->zf = NULL;
! 135: return -1;
! 136: }
! 137: }
! 138: return 0;
! 139:
! 140: case ZIP_SOURCE_READ:
! 141: if (z->len != -1)
! 142: n = len > z->len ? z->len : len;
! 143: else
! 144: n = len;
! 145:
! 146:
! 147: if ((i=zip_fread(z->zf, buf, n)) < 0)
! 148: return -1;
! 149:
! 150: if (z->len != -1)
! 151: z->len -= i;
! 152:
! 153: return i;
! 154:
! 155: case ZIP_SOURCE_CLOSE:
! 156: return 0;
! 157:
! 158: case ZIP_SOURCE_STAT:
! 159: if (len < sizeof(z->st))
! 160: return -1;
! 161: len = sizeof(z->st);
! 162:
! 163: memcpy(data, &z->st, len);
! 164: return len;
! 165:
! 166: case ZIP_SOURCE_ERROR:
! 167: {
! 168: int *e;
! 169:
! 170: if (len < sizeof(int)*2)
! 171: return -1;
! 172:
! 173: e = (int *)data;
! 174: zip_file_error_get(z->zf, e, e+1);
! 175: }
! 176: return sizeof(int)*2;
! 177:
! 178: case ZIP_SOURCE_FREE:
! 179: zip_fclose(z->zf);
! 180: free(z);
! 181: return 0;
! 182:
! 183: default:
! 184: ;
! 185: }
! 186:
! 187: return -1;
! 188: }
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