diff options
Diffstat (limited to 'tools/applypatch/xdelta3.c')
-rw-r--r-- | tools/applypatch/xdelta3.c | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/tools/applypatch/xdelta3.c b/tools/applypatch/xdelta3.c deleted file mode 100644 index c9a0f73..0000000 --- a/tools/applypatch/xdelta3.c +++ /dev/null @@ -1,121 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -#include <stdio.h> -#include <errno.h> -#include <unistd.h> - -#include "xdelta3.h" -#include "mincrypt/sha.h" - -int ApplyXDelta3Patch(const unsigned char* old_data, ssize_t old_size, - const char* patch_filename, - FILE* output, SHA_CTX* ctx) { -#define WINDOW_SIZE 32768 - - int ret; - xd3_stream stream; - xd3_config config; - - xd3_init_config(&config, 0); - config.winsize = WINDOW_SIZE; - ret = xd3_config_stream(&stream, &config); - if (ret != 0) { - fprintf(stderr, "xd3_config_stream error: %s\n", xd3_strerror(ret)); - return 1; - } - - // In xdelta3 terms, the "input" is the patch file: it contains a - // sequence of instruction codes and data that will be executed to - // produce the output file. The "source" is the original data file; - // it is a blob of data to which instructions in the input may refer - // (eg, an instruction may say "copy such-and-such range of bytes - // from the source to the output"). - - // For simplicity, we provide the entire source to xdelta as a - // single block. This means it should never have to ask us to load - // blocks of the source file. - xd3_source source; - source.name = "old name"; - source.size = old_size; - source.ioh = NULL; - source.blksize = old_size; - source.curblkno = 0; - source.curblk = old_data; - source.onblk = old_size; - - ret = xd3_set_source(&stream, &source); - if (ret != 0) { - fprintf(stderr, "xd3_set_source error: %s\n", xd3_strerror(ret)); - return 1; - } - - unsigned char buffer[WINDOW_SIZE]; - FILE* input = fopen(patch_filename, "rb"); - if (input == NULL) { - fprintf(stderr, "failed to open patch file %s: %d (%s)\n", - patch_filename, errno, strerror(errno)); - return 1; - } - - size_t bytes_read; - - do { - bytes_read = fread(buffer, 1, WINDOW_SIZE, input); - if (feof(input)) { - xd3_set_flags(&stream, XD3_FLUSH); - } - xd3_avail_input(&stream, buffer, bytes_read); - process: - ret = xd3_decode_input(&stream); - switch (ret) { - case XD3_INPUT: - continue; - case XD3_OUTPUT: - SHA_update(ctx, stream.next_out, stream.avail_out); - if (fwrite(stream.next_out, 1, stream.avail_out, output) != - stream.avail_out) { - fprintf(stderr, "short write of output file: %d (%s)\n", - errno, strerror(errno)); - return 1; - } - xd3_consume_output(&stream); - goto process; - case XD3_GETSRCBLK: - // We provided the entire source file already; it should never - // have to ask us for a block. - fprintf(stderr, "xd3_decode_input: unexpected GETSRCBLK\n"); - return 1; - case XD3_GOTHEADER: - case XD3_WINSTART: - case XD3_WINFINISH: - // These are informational events we don't care about. - goto process; - default: - fprintf(stderr, "xd3_decode_input: unknown error %s (%s)\n", - xd3_strerror(ret), stream.msg); - return 1; - } - } while (!feof(input)); - - fclose(input); - return 0; - -#undef WINDOW_SIZE -} |