diff options
Diffstat (limited to 'ext/zip/lib/zip_source_crc.c')
| -rw-r--r-- | ext/zip/lib/zip_source_crc.c | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/ext/zip/lib/zip_source_crc.c b/ext/zip/lib/zip_source_crc.c deleted file mode 100644 index 2ace747905..0000000000 --- a/ext/zip/lib/zip_source_crc.c +++ /dev/null @@ -1,202 +0,0 @@ -/* - zip_source_crc.c -- pass-through source that calculates CRC32 and size - Copyright (c) 2009-2017 Dieter Baron and Thomas Klausner - - This file is part of libzip, a library to manipulate ZIP archives. - The authors can be contacted at <libzip@nih.at> - - 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 <stdlib.h> -#include <string.h> -#include <limits.h> - -#include "zipint.h" - -struct crc_context { - int validate; /* whether to check CRC on EOF and return error on mismatch */ - int crc_complete; /* whether CRC was computed for complete file */ - zip_error_t error; - zip_uint64_t size; - zip_uint64_t position; /* current reading position */ - zip_uint64_t crc_position; /* how far we've computed the CRC */ - zip_uint32_t crc; -}; - -static zip_int64_t crc_read(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t); - - -zip_source_t * -zip_source_crc(zip_t *za, zip_source_t *src, int validate) -{ - struct crc_context *ctx; - - if (src == NULL) { - zip_error_set(&za->error, ZIP_ER_INVAL, 0); - return NULL; - } - - if ((ctx=(struct crc_context *)malloc(sizeof(*ctx))) == NULL) { - zip_error_set(&za->error, ZIP_ER_MEMORY, 0); - return NULL; - } - - zip_error_init(&ctx->error); - ctx->validate = validate; - ctx->crc_complete = 0; - ctx->crc_position = 0; - ctx->crc = (zip_uint32_t)crc32(0, NULL, 0); - ctx->size = 0; - - return zip_source_layered(za, src, crc_read, ctx); -} - - -static zip_int64_t -crc_read(zip_source_t *src, void *_ctx, void *data, zip_uint64_t len, zip_source_cmd_t cmd) -{ - struct crc_context *ctx; - zip_int64_t n; - - ctx = (struct crc_context *)_ctx; - - switch (cmd) { - case ZIP_SOURCE_OPEN: - ctx->position = 0; - return 0; - - case ZIP_SOURCE_READ: - if ((n = zip_source_read(src, data, len)) < 0) { - _zip_error_set_from_source(&ctx->error, src); - return -1; - } - - if (n == 0) { - if (ctx->crc_position == ctx->position) { - ctx->crc_complete = 1; - ctx->size = ctx->position; - - if (ctx->validate) { - struct zip_stat st; - - if (zip_source_stat(src, &st) < 0) { - _zip_error_set_from_source(&ctx->error, src); - return -1; - } - - if ((st.valid & ZIP_STAT_CRC) && st.crc != ctx->crc) { - zip_error_set(&ctx->error, ZIP_ER_CRC, 0); - return -1; - } - if ((st.valid & ZIP_STAT_SIZE) && st.size != ctx->size) { - zip_error_set(&ctx->error, ZIP_ER_INCONS, 0); - return -1; - } - } - } - } - else if (!ctx->crc_complete && ctx->position <= ctx->crc_position) { - zip_uint64_t i, nn; - - for (i = ctx->crc_position - ctx->position; i < (zip_uint64_t)n; i += nn) { - nn = ZIP_MIN(UINT_MAX, (zip_uint64_t)n-i); - - ctx->crc = (zip_uint32_t)crc32(ctx->crc, (const Bytef *)data+i, (uInt)nn); - ctx->crc_position += nn; - } - } - ctx->position += (zip_uint64_t)n; - return n; - - case ZIP_SOURCE_CLOSE: - return 0; - - case ZIP_SOURCE_STAT: - { - zip_stat_t *st; - - st = (zip_stat_t *)data; - - if (ctx->crc_complete) { - /* TODO: Set comp_size, comp_method, encryption_method? - After all, this only works for uncompressed data. */ - st->size = ctx->size; - st->crc = ctx->crc; - st->comp_size = ctx->size; - st->comp_method = ZIP_CM_STORE; - st->encryption_method = ZIP_EM_NONE; - st->valid |= ZIP_STAT_SIZE|ZIP_STAT_CRC|ZIP_STAT_COMP_SIZE|ZIP_STAT_COMP_METHOD|ZIP_STAT_ENCRYPTION_METHOD; - } - return 0; - } - - case ZIP_SOURCE_ERROR: - return zip_error_to_data(&ctx->error, data, len); - - case ZIP_SOURCE_FREE: - free(ctx); - return 0; - - case ZIP_SOURCE_SUPPORTS: - { - zip_int64_t mask = zip_source_supports(src); - - if (mask < 0) { - _zip_error_set_from_source(&ctx->error, src); - return -1; - } - - return mask & ~zip_source_make_command_bitmap(ZIP_SOURCE_BEGIN_WRITE, ZIP_SOURCE_COMMIT_WRITE, ZIP_SOURCE_ROLLBACK_WRITE, ZIP_SOURCE_SEEK_WRITE, ZIP_SOURCE_TELL_WRITE, ZIP_SOURCE_REMOVE, -1); - } - - case ZIP_SOURCE_SEEK: - { - zip_int64_t new_position; - zip_source_args_seek_t *args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error); - - if (args == NULL) { - return -1; - } - if (zip_source_seek(src, args->offset, args->whence) < 0 || (new_position = zip_source_tell(src)) < 0) { - _zip_error_set_from_source(&ctx->error, src); - return -1; - } - - ctx->position = (zip_uint64_t)new_position; - - return 0; - } - - case ZIP_SOURCE_TELL: - return (zip_int64_t)ctx->position; - - default: - zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0); - return -1; - } -} |