/* * PatchAPI PA19 file handlers * * Copyright 2019 Conor McCarthy * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA * * TODO * - Normalization of 32-bit PE executable files and reversal of special * processing of these executables is not implemented. * Without normalization, old files cannot be validated for patching. The * function NormalizeFileForPatchSignature() in Windows could be used to work * out exactly how normalization works. * Most/all of the special processing seems to be relocation of targets for * some jump/call instructions to match more of the old file and improve * compression. Patching of 64-bit exes works because mspatchc.dll does not * implement special processing of them. In 32-bit patches, the variable * named here 'unknown_count' seems to indicate presence of data related to * reversing the processing. The changes that must be reversed occur at some, * but not all, of the positions listed in the PE .reloc table. */ #include #include #include "windef.h" #include "wine/heap.h" #include "wine/debug.h" #include "patchapi.h" #include "pa19.h" #include "lzxd_dec.h" WINE_DEFAULT_DEBUG_CHANNEL(mspatcha); #define PA19_FILE_MAGIC 0x39314150 #define PATCH_OPTION_EXTRA_FLAGS 0x80000000 #define my_max(a, b) ((a) > (b) ? (a) : (b)) #define my_min(a, b) ((a) < (b) ? (a) : (b)) /* The CRC32 code is copyright (C) 1986 Gary S. Brown and was placed in the * public domain. * CRC polynomial 0xedb88320 */ static const UINT32 CRC_table[256] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; static UINT32 compute_crc32(UINT32 crc, const BYTE *pData, INT_PTR iLen) { crc ^= 0xFFFFFFFF; while (iLen > 0) { crc = CRC_table[(crc ^ *pData) & 0xFF] ^ (crc >> 8); pData++; iLen--; } return crc ^ 0xFFFFFFFF; } static UINT32 compute_zero_crc32(UINT32 crc, INT_PTR iLen) { crc ^= 0xFFFFFFFF; while (iLen > 0) { crc = CRC_table[crc & 0xFF] ^ (crc >> 8); iLen--; } return crc ^ 0xFFFFFFFF; } /*********************************************************************************** * PatchAPI PA19 file header * * BYTE magic[4]; * UINT32 options; * UINT32 options_2; (present if PATCH_OPTION_EXTRA_FLAGS set) * UINT32 timestamp; (if PATCH_OPTION_NO_TIMESTAMP is SET in options) * UVLI rebase; (present if PATCH_OPTION_NO_REBASE is not set; used on 32-bit executables) * UVLI unpatched_size; * UINT32 crc32_patched; * BYTE input_file_count; * * For each source file: * SVLI (patched_size - unpatched_size); * UINT32 crc32_unpatched; * BYTE ignore_range_count; * For each ignore range: * SVLI OffsetInOldFile; * UVLI LengthInBytes; * BYTE retain_range_count; * For each retain range: * SVLI (OffsetInOldFile - (prevOffsetInOldFile + prevLengthInBytes)); * SVLI (OffsetInNewFile - OffsetInOldFile); * UVLI LengthInBytes; * UVLI unknown_count; (a count of pairs of values related to the reversal of special * processing done to improve compression of 32-bit executables) * UVLI interleave_count; (present only if PATCH_OPTION_INTERLEAVE_FILES is set in options) * UVLI interleave_values[interleave_count * 3 - 1]; * UVLI lzxd_input_size; * * For each source file: * UINT16 lzxd_block[lzxd_input_size / 2]; (NOT always 16-bit aligned) * * UINT32 crc_hack; (rounds out the entire file crc32 to 0) */ #define MAX_RANGES 255 struct input_file_info { size_t input_size; DWORD crc32; BYTE ignore_range_count; BYTE retain_range_count; PATCH_IGNORE_RANGE ignore_table[MAX_RANGES]; PATCH_RETAIN_RANGE retain_table[MAX_RANGES]; size_t unknown_count; size_t stream_size; const BYTE *stream_start; int next_i; int next_r; }; struct patch_file_header { DWORD flags; DWORD timestamp; size_t patched_size; DWORD patched_crc32; unsigned input_file_count; struct input_file_info *file_table; const BYTE *src; const BYTE *end; DWORD err; }; /* Currently supported options. Some such as PATCH_OPTION_FAIL_IF_BIGGER don't * affect decoding but can get recorded in the patch file anyway */ #define PATCH_OPTION_SUPPORTED_FLAGS ( \ PATCH_OPTION_USE_LZX_A \ | PATCH_OPTION_USE_LZX_B \ | PATCH_OPTION_USE_LZX_LARGE \ | PATCH_OPTION_NO_BINDFIX \ | PATCH_OPTION_NO_LOCKFIX \ | PATCH_OPTION_NO_REBASE \ | PATCH_OPTION_FAIL_IF_SAME_FILE \ | PATCH_OPTION_FAIL_IF_BIGGER \ | PATCH_OPTION_NO_CHECKSUM \ | PATCH_OPTION_NO_RESTIMEFIX \ | PATCH_OPTION_NO_TIMESTAMP \ | PATCH_OPTION_EXTRA_FLAGS) /* read a byte-aligned little-endian UINT32 from input and set error if eof */ static inline UINT32 read_raw_uint32(struct patch_file_header *ph) { const BYTE *src = ph->src; ph->src += 4; if (ph->src > ph->end) { ph->err = ERROR_PATCH_CORRUPT; return 0; } return src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24); } /* Read a variable-length integer from a sequence of bytes terminated by * a value with bit 7 set. Set error if invalid or eof */ static UINT64 read_uvli(struct patch_file_header *ph) { const BYTE *vli = ph->src; UINT64 n; ptrdiff_t i; ptrdiff_t limit = my_min(ph->end - vli, 9); if (ph->src >= ph->end) { ph->err = ERROR_PATCH_CORRUPT; return 0; } n = vli[0] & 0x7F; for (i = 1; i < limit && vli[i - 1] < 0x80; ++i) n += (UINT64)(vli[i] & 0x7F) << (7 * i); if (vli[i - 1] < 0x80) { TRACE("exceeded maximum vli size\n"); ph->err = ERROR_PATCH_CORRUPT; return 0; } ph->src += i; return n; } /* Signed variant of the above. First byte sign flag is 0x40. */ static INT64 read_svli(struct patch_file_header *ph) { const BYTE *vli = ph->src; INT64 n; ptrdiff_t i; ptrdiff_t limit = my_min(ph->end - vli, 9); if (ph->src >= ph->end) { ph->err = ERROR_PATCH_CORRUPT; return 0; } n = vli[0] & 0x3F; for (i = 1; i < limit && vli[i - 1] < 0x80; ++i) n += (INT64)(vli[i] & 0x7F) << (7 * i - 1); if (vli[i - 1] < 0x80) { TRACE("exceeded maximum vli size\n"); ph->err = ERROR_PATCH_CORRUPT; return 0; } if (vli[0] & 0x40) n = -n; ph->src += i; return n; } static int __cdecl compare_ignored_range(const void *a, const void *b) { LONG delta = ((PATCH_IGNORE_RANGE*)a)->OffsetInOldFile - ((PATCH_IGNORE_RANGE*)b)->OffsetInOldFile; if (delta > 0) return 1; if (delta < 0) return -1; return 0; } static int __cdecl compare_retained_range_old(const void *a, const void *b) { LONG delta = ((PATCH_RETAIN_RANGE*)a)->OffsetInOldFile - ((PATCH_RETAIN_RANGE*)b)->OffsetInOldFile; if (delta > 0) return 1; if (delta < 0) return -1; return 0; } static int __cdecl compare_retained_range_new(const void *a, const void *b) { LONG delta = ((PATCH_RETAIN_RANGE*)a)->OffsetInNewFile - ((PATCH_RETAIN_RANGE*)b)->OffsetInNewFile; if (delta > 0) return 1; if (delta < 0) return -1; return 0; } static int read_header(struct patch_file_header *ph, const BYTE *buf, size_t size) { unsigned fileno; ph->src = buf; ph->end = buf + size; ph->file_table = NULL; ph->err = ERROR_SUCCESS; if (read_raw_uint32(ph) != PA19_FILE_MAGIC) { TRACE("no PA19 signature\n"); ph->err = ERROR_PATCH_CORRUPT; return -1; } ph->flags = read_raw_uint32(ph); if ((ph->flags & PATCH_OPTION_SUPPORTED_FLAGS) != ph->flags) { FIXME("unsupported option flag(s): 0x%08x\n", ph->flags & ~PATCH_OPTION_SUPPORTED_FLAGS); ph->err = ERROR_PATCH_PACKAGE_UNSUPPORTED; return -1; } /* additional 32-bit flag field */ if (ph->flags & PATCH_OPTION_EXTRA_FLAGS) { TRACE("skipping extra flag field\n"); (void)read_raw_uint32(ph); } /* the meaning of PATCH_OPTION_NO_TIMESTAMP is inverted for decoding */ if(ph->flags & PATCH_OPTION_NO_TIMESTAMP) ph->timestamp = read_raw_uint32(ph); /* not sure what this value is for, but its absence seems to mean only that timestamps * in the decompressed 32-bit exe are not modified */ if (!(ph->flags & PATCH_OPTION_NO_REBASE)) { TRACE("skipping rebase field\n"); (void)read_uvli(ph); } ph->patched_size = (size_t)read_uvli(ph); TRACE("patched file size will be %u\n", (unsigned)ph->patched_size); ph->patched_crc32 = read_raw_uint32(ph); ph->input_file_count = *ph->src; ++ph->src; TRACE("patch supports %u old file(s)\n", ph->input_file_count); /* if no old file used, input_file_count is still 1 */ if (ph->input_file_count == 0) { ph->err = ERROR_PATCH_CORRUPT; return -1; } if (ph->err != ERROR_SUCCESS) return -1; ph->file_table = heap_calloc(ph->input_file_count, sizeof(struct input_file_info)); if (ph->file_table == NULL) { ph->err = ERROR_OUTOFMEMORY; return -1; } for (fileno = 0; fileno < ph->input_file_count; ++fileno) { struct input_file_info *fi = ph->file_table + fileno; ptrdiff_t delta; unsigned i; delta = (ptrdiff_t)read_svli(ph); fi->input_size = ph->patched_size + delta; fi->crc32 = read_raw_uint32(ph); fi->ignore_range_count = *ph->src; ++ph->src; TRACE("found %u range(s) to ignore\n", fi->ignore_range_count); for (i = 0; i < fi->ignore_range_count; ++i) { PATCH_IGNORE_RANGE *ir = fi->ignore_table + i; ir->OffsetInOldFile = (LONG)read_svli(ph); ir->LengthInBytes = (ULONG)read_uvli(ph); if (i != 0) { ir->OffsetInOldFile += fi->ignore_table[i - 1].OffsetInOldFile + fi->ignore_table[i - 1].LengthInBytes; } if (ir->OffsetInOldFile > fi->input_size || ir->OffsetInOldFile + ir->LengthInBytes > fi->input_size || ir->LengthInBytes > fi->input_size) { ph->err = ERROR_PATCH_CORRUPT; return -1; } } fi->retain_range_count = *ph->src; ++ph->src; TRACE("found %u range(s) to retain\n", fi->retain_range_count); for (i = 0; i < fi->retain_range_count; ++i) { PATCH_RETAIN_RANGE *rr = fi->retain_table + i; rr->OffsetInOldFile = (LONG)read_svli(ph); if (i != 0) rr->OffsetInOldFile += fi->retain_table[i - 1].OffsetInOldFile + fi->retain_table[i - 1].LengthInBytes; rr->OffsetInNewFile = rr->OffsetInOldFile + (LONG)read_svli(ph); rr->LengthInBytes = (ULONG)read_uvli(ph); if (rr->OffsetInOldFile > fi->input_size || rr->OffsetInOldFile + rr->LengthInBytes > fi->input_size || rr->OffsetInNewFile > ph->patched_size || rr->OffsetInNewFile + rr->LengthInBytes > ph->patched_size || rr->LengthInBytes > ph->patched_size) { ph->err = ERROR_PATCH_CORRUPT; return -1; } /* ranges in new file must be equal and in the same order for all source files */ if (fileno != 0) { PATCH_RETAIN_RANGE *rr_0 = ph->file_table[0].retain_table + i; if (rr->OffsetInNewFile != rr_0->OffsetInNewFile || rr->LengthInBytes != rr_0->LengthInBytes) { ph->err = ERROR_PATCH_CORRUPT; return -1; } } } fi->unknown_count = (size_t)read_uvli(ph); if (fi->unknown_count) { FIXME("special processing of 32-bit executables not implemented.\n"); ph->err = ERROR_PATCH_PACKAGE_UNSUPPORTED; return -1; } fi->stream_size = (size_t)read_uvli(ph); } for (fileno = 0; fileno < ph->input_file_count; ++fileno) { struct input_file_info *fi = ph->file_table + fileno; qsort(fi->ignore_table, fi->ignore_range_count, sizeof(fi->ignore_table[0]), compare_ignored_range); qsort(fi->retain_table, fi->retain_range_count, sizeof(fi->retain_table[0]), compare_retained_range_old); fi->stream_start = ph->src; ph->src += fi->stream_size; } /* skip the crc adjustment field */ ph->src = my_min(ph->src + 4, ph->end); { UINT32 crc = compute_crc32(0, buf, ph->src - buf) ^ 0xFFFFFFFF; if (crc != 0) { TRACE("patch file crc32 failed\n"); if (ph->src < ph->end) FIXME("probable header parsing error\n"); ph->err = ERROR_PATCH_CORRUPT; } } return (ph->err == ERROR_SUCCESS) ? 0 : -1; } static void free_header(struct patch_file_header *ph) { heap_free(ph->file_table); } #define TICKS_PER_SEC 10000000 #define SEC_TO_UNIX_EPOCH ((369 * 365 + 89) * (ULONGLONG)86400) static void posix_time_to_file_time(ULONG timestamp, FILETIME *ft) { UINT64 ticks = ((UINT64)timestamp + SEC_TO_UNIX_EPOCH) * TICKS_PER_SEC; ft->dwLowDateTime = (DWORD)ticks; ft->dwHighDateTime = (DWORD)(ticks >> 32); } /* Get the next range to ignore in the old file. * fi->next_i must be initialized before use */ static ULONG next_ignored_range(const struct input_file_info *fi, size_t index, ULONG old_file_size, ULONG *end) { ULONG start = old_file_size; *end = old_file_size; /* if patching is unnecessary, the ignored ranges are skipped during crc calc */ if (fi->next_i < fi->ignore_range_count && fi->stream_size != 0) { start = fi->ignore_table[fi->next_i].OffsetInOldFile; *end = my_max(start + fi->ignore_table[fi->next_i].LengthInBytes, index); start = my_max(start, index); } return start; } /* Get the next range to retain from the old file. * fi->next_r must be initialized before use */ static ULONG next_retained_range_old(const struct input_file_info *fi, size_t index, ULONG old_file_size, ULONG *end) { ULONG start = old_file_size; *end = old_file_size; if (fi->next_r < fi->retain_range_count) { start = fi->retain_table[fi->next_r].OffsetInOldFile; *end = my_max(start + fi->retain_table[fi->next_r].LengthInBytes, index); start = my_max(start, index); } return start; } /* Get the next range to retain in the new file. * fi->next_r must be initialized before use */ static ULONG next_retained_range_new(const struct input_file_info *fi, size_t index, ULONG new_file_size, ULONG *end) { ULONG start = new_file_size; *end = new_file_size; if (fi->next_r < fi->retain_range_count) { start = fi->retain_table[fi->next_r].OffsetInNewFile; *end = my_max(start + fi->retain_table[fi->next_r].LengthInBytes, index); start = my_max(start, index); } return start; } /* Find the next range in the old file which must be assumed zero-filled during crc32 calc */ static ULONG next_zeroed_range(struct input_file_info *fi, size_t index, ULONG old_file_size, ULONG *end) { ULONG start = old_file_size; ULONG end_i; ULONG start_i; ULONG end_r; ULONG start_r; *end = old_file_size; start_i = next_ignored_range(fi, index, old_file_size, &end_i); start_r = next_retained_range_old(fi, index, old_file_size, &end_r); if (start_i < start_r) { start = start_i; *end = end_i; ++fi->next_i; } else { start = start_r; *end = end_r; ++fi->next_r; } return start; } /* Use the crc32 of the input file to match the file with an entry in the patch file table */ struct input_file_info *find_matching_old_file(const struct patch_file_header *ph, const BYTE *old_file_view, ULONG old_file_size) { unsigned i; for (i = 0; i < ph->input_file_count; ++i) { DWORD crc32 = 0; ULONG index; if (ph->file_table[i].input_size != old_file_size) continue; ph->file_table[i].next_i = 0; for (index = 0; index < old_file_size; ) { ULONG end; ULONG start = next_zeroed_range(ph->file_table + i, index, old_file_size, &end); crc32 = compute_crc32(crc32, old_file_view + index, start - index); crc32 = compute_zero_crc32(crc32, end - start); index = end; } if (ph->file_table[i].crc32 == crc32) return ph->file_table + i; } return NULL; } /* Zero-fill ignored ranges in the old file data for decoder matching */ static void zero_fill_ignored_ranges(BYTE *old_file_buf, const struct input_file_info *fi) { size_t i; for (i = 0; i < fi->ignore_range_count; ++i) { memset(old_file_buf + fi->ignore_table[i].OffsetInOldFile, 0, fi->ignore_table[i].LengthInBytes); } } /* Zero-fill retained ranges in the old file data for decoder matching */ static void zero_fill_retained_ranges(BYTE *old_file_buf, BYTE *new_file_buf, const struct input_file_info *fi) { size_t i; for (i = 0; i < fi->retain_range_count; ++i) { memset(old_file_buf + fi->retain_table[i].OffsetInOldFile, 0, fi->retain_table[i].LengthInBytes); } } /* Copy the retained ranges to the new file buffer */ static void apply_retained_ranges(const BYTE *old_file_buf, BYTE *new_file_buf, const struct input_file_info *fi) { size_t i; if (old_file_buf == NULL) return; for (i = 0; i < fi->retain_range_count; ++i) { memcpy(new_file_buf + fi->retain_table[i].OffsetInNewFile, old_file_buf + fi->retain_table[i].OffsetInOldFile, fi->retain_table[i].LengthInBytes); } } /* Compute the crc32 for the new file, assuming zero for the retained ranges */ static DWORD compute_target_crc32(struct input_file_info *fi, const BYTE *new_file_buf, ULONG new_file_size) { DWORD crc32 = 0; ULONG index; qsort(fi->retain_table, fi->retain_range_count, sizeof(fi->retain_table[0]), compare_retained_range_new); fi->next_r = 0; for (index = 0; index < new_file_size; ) { ULONG end; ULONG start = next_retained_range_new(fi, index, new_file_size, &end); ++fi->next_r; crc32 = compute_crc32(crc32, new_file_buf + index, start - index); crc32 = compute_zero_crc32(crc32, end - start); index = end; } return crc32; } DWORD apply_patch_to_file_by_buffers(const BYTE *patch_file_view, const ULONG patch_file_size, const BYTE *old_file_view, ULONG old_file_size, BYTE **pnew_file_buf, const ULONG new_file_buf_size, ULONG *new_file_size, FILETIME *new_file_time, const ULONG apply_option_flags, PATCH_PROGRESS_CALLBACK *progress_fn, void *progress_ctx, const BOOL test_header_only) { DWORD err = ERROR_SUCCESS; struct input_file_info *file_info; struct patch_file_header ph; size_t buf_size; BYTE *new_file_buf = NULL; BYTE *decode_buf = NULL; if (pnew_file_buf == NULL) { if (!test_header_only && !(apply_option_flags & APPLY_OPTION_TEST_ONLY)) return ERROR_INVALID_PARAMETER; } else { new_file_buf = *pnew_file_buf; } if (old_file_view == NULL) old_file_size = 0; if (read_header(&ph, patch_file_view, patch_file_size)) { err = ph.err; goto free_patch_header; } if (new_file_size != NULL) *new_file_size = (ULONG)ph.patched_size; if (new_file_buf != NULL && new_file_buf_size < ph.patched_size) { err = ERROR_INSUFFICIENT_BUFFER; goto free_patch_header; } file_info = find_matching_old_file(&ph, old_file_view, old_file_size); if (file_info == NULL) { err = ERROR_PATCH_WRONG_FILE; goto free_patch_header; } if (file_info->input_size != old_file_size) { err = ERROR_PATCH_CORRUPT; goto free_patch_header; } if (file_info->stream_size == 0 && (apply_option_flags & APPLY_OPTION_FAIL_IF_EXACT)) { err = ERROR_PATCH_NOT_NECESSARY; goto free_patch_header; } if (file_info->stream_size != 0 && file_info->input_size > ((ph.flags & PATCH_OPTION_USE_LZX_LARGE) ? MAX_LARGE_WINDOW : MAX_NORMAL_WINDOW)) { /* interleaved by default but not the same as PATCH_OPTION_INTERLEAVE_FILES */ FIXME("interleaved LZXD decompression is not supported.\n"); err = ERROR_PATCH_PACKAGE_UNSUPPORTED; goto free_patch_header; } if (test_header_only) goto free_patch_header; /* missing lzxd stream means it's a header test extract */ if (file_info->stream_start + file_info->stream_size > ph.end) { err = ERROR_PATCH_NOT_AVAILABLE; goto free_patch_header; } buf_size = old_file_size + ph.patched_size; decode_buf = new_file_buf; if (new_file_buf == NULL || new_file_buf_size < buf_size) { /* decode_buf must have room for both files, so allocate a new buffer if * necessary. This will be returned to the caller if new_file_buf == NULL */ decode_buf = VirtualAlloc(NULL, buf_size, MEM_COMMIT, PAGE_READWRITE); if (decode_buf == NULL) { err = GetLastError(); goto free_patch_header; } } if (old_file_view != NULL) memcpy(decode_buf, old_file_view, file_info->input_size); zero_fill_ignored_ranges(decode_buf, file_info); zero_fill_retained_ranges(decode_buf, decode_buf + file_info->input_size, file_info); if (file_info->stream_size != 0) { err = decode_lzxd_stream(file_info->stream_start, file_info->stream_size, decode_buf, ph.patched_size, file_info->input_size, ph.flags & PATCH_OPTION_USE_LZX_LARGE, progress_fn, progress_ctx); } else if (file_info->input_size == ph.patched_size) { /* files are identical so copy old to new. copying is avoidable but rare */ memcpy(decode_buf + file_info->input_size, decode_buf, ph.patched_size); } else { err = ERROR_PATCH_CORRUPT; goto free_decode_buf; } if(err != ERROR_SUCCESS) { if (err == ERROR_PATCH_DECODE_FAILURE) FIXME("decode failure: data corruption or bug.\n"); goto free_decode_buf; } apply_retained_ranges(old_file_view, decode_buf + file_info->input_size, file_info); if (ph.patched_crc32 != compute_target_crc32(file_info, decode_buf + file_info->input_size, ph.patched_size)) { err = ERROR_PATCH_CORRUPT; goto free_decode_buf; } /* retained ranges must be ignored for this test */ if ((apply_option_flags & APPLY_OPTION_FAIL_IF_EXACT) && file_info->input_size == ph.patched_size && memcmp(decode_buf, decode_buf + file_info->input_size, ph.patched_size) == 0) { err = ERROR_PATCH_NOT_NECESSARY; goto free_decode_buf; } if (!(apply_option_flags & APPLY_OPTION_TEST_ONLY)) { if (new_file_buf == NULL) { /* caller will VirtualFree the buffer */ new_file_buf = decode_buf; *pnew_file_buf = new_file_buf; } memmove(new_file_buf, decode_buf + old_file_size, ph.patched_size); } if (new_file_time != NULL) { new_file_time->dwLowDateTime = 0; new_file_time->dwHighDateTime = 0; /* the meaning of PATCH_OPTION_NO_TIMESTAMP is inverted for decoding */ if (ph.flags & PATCH_OPTION_NO_TIMESTAMP) posix_time_to_file_time(ph.timestamp, new_file_time); } free_decode_buf: if(decode_buf != NULL && decode_buf != new_file_buf) VirtualFree(decode_buf, 0, MEM_RELEASE); free_patch_header: free_header(&ph); return err; } BOOL apply_patch_to_file_by_handles(HANDLE patch_file_hndl, HANDLE old_file_hndl, HANDLE new_file_hndl, const ULONG apply_option_flags, PATCH_PROGRESS_CALLBACK *progress_fn, void *progress_ctx, const BOOL test_header_only) { LARGE_INTEGER patch_size; LARGE_INTEGER old_size; HANDLE patch_map; HANDLE old_map = NULL; BYTE *patch_buf; const BYTE *old_buf = NULL; BYTE *new_buf = NULL; ULONG new_size; FILETIME new_time; BOOL res = FALSE; DWORD err = ERROR_SUCCESS; /* truncate the output file if required, or set the handle to invalid */ if (test_header_only || (apply_option_flags & APPLY_OPTION_TEST_ONLY)) { new_file_hndl = INVALID_HANDLE_VALUE; } else if (SetFilePointer(new_file_hndl, 0, NULL, FILE_BEGIN) == INVALID_SET_FILE_POINTER || !SetEndOfFile(new_file_hndl)) { err = GetLastError(); return FALSE; } if (patch_file_hndl == INVALID_HANDLE_VALUE) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } old_size.QuadPart = 0; if (!GetFileSizeEx(patch_file_hndl, &patch_size) || (old_file_hndl != INVALID_HANDLE_VALUE && !GetFileSizeEx(old_file_hndl, &old_size))) { /* Last error set by API */ return FALSE; } patch_map = CreateFileMappingW(patch_file_hndl, NULL, PAGE_READONLY, 0, 0, NULL); if (patch_map == NULL) { /* Last error set by API */ return FALSE; } if (old_file_hndl != INVALID_HANDLE_VALUE) { old_map = CreateFileMappingW(old_file_hndl, NULL, PAGE_READONLY, 0, 0, NULL); if (old_map == NULL) { err = GetLastError(); goto close_patch_map; } } patch_buf = MapViewOfFile(patch_map, FILE_MAP_READ, 0, 0, (SIZE_T)patch_size.QuadPart); if (patch_buf == NULL) { err = GetLastError(); goto close_old_map; } if (old_size.QuadPart) { old_buf = MapViewOfFile(old_map, FILE_MAP_READ, 0, 0, (SIZE_T)old_size.QuadPart); if (old_buf == NULL) { err = GetLastError(); goto unmap_patch_buf; } } err = apply_patch_to_file_by_buffers(patch_buf, (ULONG)patch_size.QuadPart, old_buf, (ULONG)old_size.QuadPart, &new_buf, 0, &new_size, &new_time, apply_option_flags, progress_fn, progress_ctx, test_header_only); if(err) goto free_new_buf; res = TRUE; if(new_file_hndl != INVALID_HANDLE_VALUE) { DWORD Written = 0; res = WriteFile(new_file_hndl, new_buf, new_size, &Written, NULL); if (!res) err = GetLastError(); else if (new_time.dwLowDateTime || new_time.dwHighDateTime) SetFileTime(new_file_hndl, &new_time, NULL, &new_time); } free_new_buf: if (new_buf != NULL) VirtualFree(new_buf, 0, MEM_RELEASE); if (old_buf != NULL) UnmapViewOfFile(old_buf); unmap_patch_buf: UnmapViewOfFile(patch_buf); close_old_map: if (old_map != NULL) CloseHandle(old_map); close_patch_map: CloseHandle(patch_map); SetLastError(err); return res; } BOOL apply_patch_to_file(LPCWSTR patch_file_name, LPCWSTR old_file_name, LPCWSTR new_file_name, const ULONG apply_option_flags, PATCH_PROGRESS_CALLBACK *progress_fn, void *progress_ctx, const BOOL test_header_only) { HANDLE patch_hndl; HANDLE old_hndl = INVALID_HANDLE_VALUE; HANDLE new_hndl = INVALID_HANDLE_VALUE; BOOL res = FALSE; DWORD err = ERROR_SUCCESS; patch_hndl = CreateFileW(patch_file_name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); if (patch_hndl == INVALID_HANDLE_VALUE) { /* last error set by CreateFileW */ return FALSE; } if (old_file_name != NULL) { old_hndl = CreateFileW(old_file_name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); if (old_hndl == INVALID_HANDLE_VALUE) { err = GetLastError(); goto close_patch_file; } } if (!test_header_only && !(apply_option_flags & APPLY_OPTION_TEST_ONLY)) { new_hndl = CreateFileW(new_file_name, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL); if (new_hndl == INVALID_HANDLE_VALUE) { err = GetLastError(); goto close_old_file; } } res = apply_patch_to_file_by_handles(patch_hndl, old_hndl, new_hndl, apply_option_flags, progress_fn, progress_ctx, test_header_only); if(!res) err = GetLastError(); if (new_hndl != INVALID_HANDLE_VALUE) { CloseHandle(new_hndl); if (!res) DeleteFileW(new_file_name); } close_old_file: if (old_hndl != INVALID_HANDLE_VALUE) CloseHandle(old_hndl); close_patch_file: CloseHandle(patch_hndl); /* set last error even on success as per windows */ SetLastError(err); return res; }