Annotation of embedaddon/php/ext/zip/lib/zip_source_crc.c, revision 1.1
1.1 ! misho 1: /*
! 2: zip_source_crc.c -- pass-through source that calculates CRC32 and size
! 3: Copyright (C) 2009 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 crc {
! 42: int eof;
! 43: int validate;
! 44: int e[2];
! 45: zip_uint64_t size;
! 46: zip_uint32_t crc;
! 47: };
! 48:
! 49: static zip_int64_t crc_read(struct zip_source *, void *, void *
! 50: , zip_uint64_t, enum zip_source_cmd);
! 51:
! 52:
! 53:
! 54: ZIP_EXTERN(struct zip_source *)
! 55: zip_source_crc(struct zip *za, struct zip_source *src, int validate)
! 56: {
! 57: struct crc *ctx;
! 58:
! 59: if (src == NULL) {
! 60: _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
! 61: return NULL;
! 62: }
! 63:
! 64: if ((ctx=(struct crc *)malloc(sizeof(*ctx))) == NULL) {
! 65: _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
! 66: return NULL;
! 67: }
! 68:
! 69: ctx->validate = validate;
! 70:
! 71: return zip_source_layered(za, src, crc_read, ctx);
! 72: }
! 73:
! 74:
! 75:
! 76: static zip_int64_t
! 77: crc_read(struct zip_source *src, void *_ctx, void *data,
! 78: zip_uint64_t len, enum zip_source_cmd cmd)
! 79: {
! 80: struct crc *ctx;
! 81: zip_int64_t n;
! 82:
! 83: ctx = (struct crc *)_ctx;
! 84:
! 85: switch (cmd) {
! 86: case ZIP_SOURCE_OPEN:
! 87: ctx->eof = 0;
! 88: ctx->crc = crc32(0, NULL, 0);
! 89: ctx->size = 0;
! 90:
! 91: return 0;
! 92:
! 93: case ZIP_SOURCE_READ:
! 94: if (ctx->eof || len == 0)
! 95: return 0;
! 96:
! 97: if ((n=zip_source_read(src, data, len)) < 0)
! 98: return ZIP_SOURCE_ERR_LOWER;
! 99:
! 100: if (n == 0) {
! 101: ctx->eof = 1;
! 102: if (ctx->validate) {
! 103: struct zip_stat st;
! 104:
! 105: if (zip_source_stat(src, &st) < 0)
! 106: return ZIP_SOURCE_ERR_LOWER;
! 107:
! 108: if ((st.valid & ZIP_STAT_CRC) && st.crc != ctx->crc) {
! 109: ctx->e[0] = ZIP_ER_CRC;
! 110: ctx->e[1] = 0;
! 111:
! 112: return -1;
! 113: }
! 114: if ((st.valid & ZIP_STAT_SIZE) && st.size != ctx->size) {
! 115: ctx->e[0] = ZIP_ER_INCONS;
! 116: ctx->e[1] = 0;
! 117:
! 118: return -1;
! 119: }
! 120: }
! 121: }
! 122: else {
! 123: ctx->size += n;
! 124: ctx->crc = crc32(ctx->crc, data, n);
! 125: }
! 126: return n;
! 127:
! 128: case ZIP_SOURCE_CLOSE:
! 129: return 0;
! 130:
! 131: case ZIP_SOURCE_STAT:
! 132: {
! 133: struct zip_stat *st;
! 134:
! 135: st = (struct zip_stat *)data;
! 136:
! 137: if (ctx->eof) {
! 138: /* XXX: Set comp_size, comp_method, encryption_method?
! 139: After all, this only works for uncompressed data. */
! 140: st->size = ctx->size;
! 141: st->crc = ctx->crc;
! 142: st->valid |= ZIP_STAT_SIZE|ZIP_STAT_CRC;
! 143: }
! 144: }
! 145: return 0;
! 146:
! 147: case ZIP_SOURCE_ERROR:
! 148: memcpy(data, ctx->e, sizeof(ctx->e));
! 149: return 0;
! 150:
! 151: case ZIP_SOURCE_FREE:
! 152: free(ctx);
! 153: return 0;
! 154:
! 155: default:
! 156: return -1;
! 157: }
! 158:
! 159: }
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