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wine/dlls/mspatcha/pa19.c
Zebediah Figura 31cbdfa49e mspatcha: Use the standard max() and min() macros. 
Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
2019-08-02 10:52:03 +02:00

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/*
* 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 <stdarg.h>
#include <stdlib.h>
#include "windef.h"
#include "winternl.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
static UINT32 compute_zero_crc32(UINT32 crc, INT_PTR len)
{
static const BYTE zero_buffer[1024];
while (len)
{
crc = RtlComputeCrc32(crc, zero_buffer, min(len, sizeof(zero_buffer)));
len -= min(len, sizeof(zero_buffer));
}
return crc;
}
/***********************************************************************************
* 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 = 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 = 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 = min(ph->src + 4, ph->end);
{
UINT32 crc = RtlComputeCrc32(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 = max(start + fi->ignore_table[fi->next_i].LengthInBytes, index);
start = 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 = max(start + fi->retain_table[fi->next_r].LengthInBytes, index);
start = 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 = max(start + fi->retain_table[fi->next_r].LengthInBytes, index);
start = 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 = RtlComputeCrc32(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 = RtlComputeCrc32(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;
}
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