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-rw-r--r--applypatch/imgdiff.cpp194
1 files changed, 96 insertions, 98 deletions
diff --git a/applypatch/imgdiff.cpp b/applypatch/imgdiff.cpp
index f22502e38..395150614 100644
--- a/applypatch/imgdiff.cpp
+++ b/applypatch/imgdiff.cpp
@@ -121,17 +121,23 @@
* information that is stored on the system partition.
*/
+#include "applypatch/imgdiff.h"
+
#include <errno.h>
-#include <inttypes.h>
+#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
-#include <unistd.h>
#include <sys/types.h>
+#include <unistd.h>
+
+#include <android-base/file.h>
+#include <android-base/unique_fd.h>
+
+#include <bsdiff.h>
+#include <zlib.h>
-#include "zlib.h"
-#include "imgdiff.h"
#include "utils.h"
typedef struct {
@@ -144,8 +150,6 @@ typedef struct {
size_t source_start;
size_t source_len;
- off_t* I; // used by bsdiff
-
// --- for CHUNK_DEFLATE chunks only: ---
// original (compressed) deflate data
@@ -179,10 +183,6 @@ static int fileentry_compare(const void* a, const void* b) {
}
}
-// from bsdiff.c
-int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* newdata, off_t newsize,
- const char* patch_filename);
-
unsigned char* ReadZip(const char* filename,
int* num_chunks, ImageChunk** chunks,
int include_pseudo_chunk) {
@@ -193,7 +193,7 @@ unsigned char* ReadZip(const char* filename,
}
size_t sz = static_cast<size_t>(st.st_size);
- unsigned char* img = reinterpret_cast<unsigned char*>(malloc(sz));
+ unsigned char* img = static_cast<unsigned char*>(malloc(sz));
FILE* f = fopen(filename, "rb");
if (fread(img, 1, sz, f) != sz) {
printf("failed to read \"%s\" %s\n", filename, strerror(errno));
@@ -220,7 +220,7 @@ unsigned char* ReadZip(const char* filename,
int cdcount = Read2(img+i+8);
int cdoffset = Read4(img+i+16);
- ZipFileEntry* temp_entries = reinterpret_cast<ZipFileEntry*>(malloc(
+ ZipFileEntry* temp_entries = static_cast<ZipFileEntry*>(malloc(
cdcount * sizeof(ZipFileEntry)));
int entrycount = 0;
@@ -228,6 +228,7 @@ unsigned char* ReadZip(const char* filename,
for (i = 0; i < cdcount; ++i) {
if (!(cd[0] == 0x50 && cd[1] == 0x4b && cd[2] == 0x01 && cd[3] == 0x02)) {
printf("bad central directory entry %d\n", i);
+ free(temp_entries);
return NULL;
}
@@ -238,7 +239,7 @@ unsigned char* ReadZip(const char* filename,
int mlen = Read2(cd+32); // file comment len
int hoffset = Read4(cd+42); // local header offset
- char* filename = reinterpret_cast<char*>(malloc(nlen+1));
+ char* filename = static_cast<char*>(malloc(nlen+1));
memcpy(filename, cd+46, nlen);
filename[nlen] = '\0';
@@ -287,7 +288,7 @@ unsigned char* ReadZip(const char* filename,
#endif
*num_chunks = 0;
- *chunks = reinterpret_cast<ImageChunk*>(malloc((entrycount*2+2) * sizeof(ImageChunk)));
+ *chunks = static_cast<ImageChunk*>(malloc((entrycount*2+2) * sizeof(ImageChunk)));
ImageChunk* curr = *chunks;
if (include_pseudo_chunk) {
@@ -296,7 +297,6 @@ unsigned char* ReadZip(const char* filename,
curr->len = st.st_size;
curr->data = img;
curr->filename = NULL;
- curr->I = NULL;
++curr;
++*num_chunks;
}
@@ -311,10 +311,9 @@ unsigned char* ReadZip(const char* filename,
curr->deflate_len = temp_entries[nextentry].deflate_len;
curr->deflate_data = img + pos;
curr->filename = temp_entries[nextentry].filename;
- curr->I = NULL;
curr->len = temp_entries[nextentry].uncomp_len;
- curr->data = reinterpret_cast<unsigned char*>(malloc(curr->len));
+ curr->data = static_cast<unsigned char*>(malloc(curr->len));
z_stream strm;
strm.zalloc = Z_NULL;
@@ -326,6 +325,10 @@ unsigned char* ReadZip(const char* filename,
// -15 means we are decoding a 'raw' deflate stream; zlib will
// not expect zlib headers.
int ret = inflateInit2(&strm, -15);
+ if (ret < 0) {
+ printf("failed to initialize inflate: %d\n", ret);
+ return NULL;
+ }
strm.avail_out = curr->len;
strm.next_out = curr->data;
@@ -356,7 +359,6 @@ unsigned char* ReadZip(const char* filename,
}
curr->data = img + pos;
curr->filename = NULL;
- curr->I = NULL;
pos += curr->len;
++*num_chunks;
@@ -376,8 +378,7 @@ unsigned char* ReadZip(const char* filename,
* return value when done with all the chunks. Returns NULL on
* failure.
*/
-unsigned char* ReadImage(const char* filename,
- int* num_chunks, ImageChunk** chunks) {
+unsigned char* ReadImage(const char* filename, int* num_chunks, ImageChunk** chunks) {
struct stat st;
if (stat(filename, &st) != 0) {
printf("failed to stat \"%s\": %s\n", filename, strerror(errno));
@@ -385,19 +386,12 @@ unsigned char* ReadImage(const char* filename,
}
size_t sz = static_cast<size_t>(st.st_size);
- unsigned char* img = reinterpret_cast<unsigned char*>(malloc(sz + 4));
- FILE* f = fopen(filename, "rb");
- if (fread(img, 1, sz, f) != sz) {
+ unsigned char* img = static_cast<unsigned char*>(malloc(sz));
+ android::base::unique_fd fd(open(filename, O_RDONLY));
+ if (!android::base::ReadFully(fd, img, sz)) {
printf("failed to read \"%s\" %s\n", filename, strerror(errno));
- fclose(f);
- return NULL;
+ return nullptr;
}
- fclose(f);
-
- // append 4 zero bytes to the data so we can always search for the
- // four-byte string 1f8b0800 starting at any point in the actual
- // file data, without special-casing the end of the data.
- memset(img+sz, 0, 4);
size_t pos = 0;
@@ -405,9 +399,8 @@ unsigned char* ReadImage(const char* filename,
*chunks = NULL;
while (pos < sz) {
- unsigned char* p = img+pos;
+ unsigned char* p = img + pos;
- bool processed_deflate = false;
if (sz - pos >= 4 &&
p[0] == 0x1f && p[1] == 0x8b &&
p[2] == 0x08 && // deflate compression
@@ -416,8 +409,7 @@ unsigned char* ReadImage(const char* filename,
size_t chunk_offset = pos;
*num_chunks += 3;
- *chunks = reinterpret_cast<ImageChunk*>(realloc(*chunks,
- *num_chunks * sizeof(ImageChunk)));
+ *chunks = static_cast<ImageChunk*>(realloc(*chunks, *num_chunks * sizeof(ImageChunk)));
ImageChunk* curr = *chunks + (*num_chunks-3);
// create a normal chunk for the header.
@@ -425,7 +417,6 @@ unsigned char* ReadImage(const char* filename,
curr->type = CHUNK_NORMAL;
curr->len = GZIP_HEADER_LEN;
curr->data = p;
- curr->I = NULL;
pos += curr->len;
p += curr->len;
@@ -433,7 +424,6 @@ unsigned char* ReadImage(const char* filename,
curr->type = CHUNK_DEFLATE;
curr->filename = NULL;
- curr->I = NULL;
// We must decompress this chunk in order to discover where it
// ends, and so we can put the uncompressed data and its length
@@ -441,7 +431,7 @@ unsigned char* ReadImage(const char* filename,
size_t allocated = 32768;
curr->len = 0;
- curr->data = reinterpret_cast<unsigned char*>(malloc(allocated));
+ curr->data = static_cast<unsigned char*>(malloc(allocated));
curr->start = pos;
curr->deflate_data = p;
@@ -455,34 +445,37 @@ unsigned char* ReadImage(const char* filename,
// -15 means we are decoding a 'raw' deflate stream; zlib will
// not expect zlib headers.
int ret = inflateInit2(&strm, -15);
+ if (ret < 0) {
+ printf("failed to initialize inflate: %d\n", ret);
+ return NULL;
+ }
do {
strm.avail_out = allocated - curr->len;
strm.next_out = curr->data + curr->len;
ret = inflate(&strm, Z_NO_FLUSH);
if (ret < 0) {
- if (!processed_deflate) {
- // This is the first chunk, assume that it's just a spurious
- // gzip header instead of a real one.
- break;
- }
- printf("Error: inflate failed [%s] at file offset [%zu]\n"
- "imgdiff only supports gzip kernel compression,"
- " did you try CONFIG_KERNEL_LZO?\n",
+ printf("Warning: inflate failed [%s] at offset [%zu],"
+ " treating as a normal chunk\n",
strm.msg, chunk_offset);
- free(img);
- return NULL;
+ break;
}
curr->len = allocated - strm.avail_out;
if (strm.avail_out == 0) {
allocated *= 2;
- curr->data = reinterpret_cast<unsigned char*>(realloc(curr->data, allocated));
+ curr->data = static_cast<unsigned char*>(realloc(curr->data, allocated));
}
- processed_deflate = true;
} while (ret != Z_STREAM_END);
curr->deflate_len = sz - strm.avail_in - pos;
inflateEnd(&strm);
+
+ if (ret < 0) {
+ free(curr->data);
+ *num_chunks -= 2;
+ continue;
+ }
+
pos += curr->deflate_len;
p += curr->deflate_len;
++curr;
@@ -493,7 +486,6 @@ unsigned char* ReadImage(const char* filename,
curr->start = pos;
curr->len = GZIP_FOOTER_LEN;
curr->data = img+pos;
- curr->I = NULL;
pos += curr->len;
p += curr->len;
@@ -505,8 +497,7 @@ unsigned char* ReadImage(const char* filename,
// the decompression.
size_t footer_size = Read4(p-4);
if (footer_size != curr[-2].len) {
- printf("Error: footer size %zu != decompressed size %zu\n",
- footer_size, curr[-2].len);
+ printf("Error: footer size %zu != decompressed size %zu\n", footer_size, curr[-2].len);
free(img);
return NULL;
}
@@ -514,10 +505,9 @@ unsigned char* ReadImage(const char* filename,
// Reallocate the list for every chunk; we expect the number of
// chunks to be small (5 for typical boot and recovery images).
++*num_chunks;
- *chunks = reinterpret_cast<ImageChunk*>(realloc(*chunks, *num_chunks * sizeof(ImageChunk)));
+ *chunks = static_cast<ImageChunk*>(realloc(*chunks, *num_chunks * sizeof(ImageChunk)));
ImageChunk* curr = *chunks + (*num_chunks-1);
curr->start = pos;
- curr->I = NULL;
// 'pos' is not the offset of the start of a gzip chunk, so scan
// forward until we find a gzip header.
@@ -525,10 +515,8 @@ unsigned char* ReadImage(const char* filename,
curr->data = p;
for (curr->len = 0; curr->len < (sz - pos); ++curr->len) {
- if (p[curr->len] == 0x1f &&
- p[curr->len+1] == 0x8b &&
- p[curr->len+2] == 0x08 &&
- p[curr->len+3] == 0x00) {
+ if (sz - pos >= 4 && p[curr->len] == 0x1f && p[curr->len + 1] == 0x8b &&
+ p[curr->len + 2] == 0x08 && p[curr->len + 3] == 0x00) {
break;
}
}
@@ -565,10 +553,18 @@ int TryReconstruction(ImageChunk* chunk, unsigned char* out) {
int ret;
ret = deflateInit2(&strm, chunk->level, chunk->method, chunk->windowBits,
chunk->memLevel, chunk->strategy);
+ if (ret < 0) {
+ printf("failed to initialize deflate: %d\n", ret);
+ return -1;
+ }
do {
strm.avail_out = BUFFER_SIZE;
strm.next_out = out;
ret = deflate(&strm, Z_FINISH);
+ if (ret < 0) {
+ printf("failed to deflate: %d\n", ret);
+ return -1;
+ }
size_t have = BUFFER_SIZE - strm.avail_out;
if (memcmp(out, chunk->deflate_data+p, have) != 0) {
@@ -598,8 +594,7 @@ int ReconstructDeflateChunk(ImageChunk* chunk) {
return -1;
}
- size_t p = 0;
- unsigned char* out = reinterpret_cast<unsigned char*>(malloc(BUFFER_SIZE));
+ unsigned char* out = static_cast<unsigned char*>(malloc(BUFFER_SIZE));
// We only check two combinations of encoder parameters: level 6
// (the default) and level 9 (the maximum).
@@ -620,12 +615,12 @@ int ReconstructDeflateChunk(ImageChunk* chunk) {
}
/*
- * Given source and target chunks, compute a bsdiff patch between them
- * by running bsdiff in a subprocess. Return the patch data, placing
- * its length in *size. Return NULL on failure. We expect the bsdiff
- * program to be in the path.
+ * Given source and target chunks, compute a bsdiff patch between them.
+ * Return the patch data, placing its length in *size. Return NULL on failure.
+ * |bsdiff_cache| can be used to cache the suffix array if the same |src| chunk
+ * is used repeatedly, pass nullptr if not needed.
*/
-unsigned char* MakePatch(ImageChunk* src, ImageChunk* tgt, size_t* size) {
+unsigned char* MakePatch(ImageChunk* src, ImageChunk* tgt, size_t* size, saidx_t** bsdiff_cache) {
if (tgt->type == CHUNK_NORMAL) {
if (tgt->len <= 160) {
tgt->type = CHUNK_RAW;
@@ -634,7 +629,11 @@ unsigned char* MakePatch(ImageChunk* src, ImageChunk* tgt, size_t* size) {
}
}
+#if defined(__ANDROID__)
+ char ptemp[] = "/data/local/tmp/imgdiff-patch-XXXXXX";
+#else
char ptemp[] = "/tmp/imgdiff-patch-XXXXXX";
+#endif
int fd = mkstemp(ptemp);
if (fd == -1) {
@@ -645,7 +644,7 @@ unsigned char* MakePatch(ImageChunk* src, ImageChunk* tgt, size_t* size) {
close(fd); // temporary file is created and we don't need its file
// descriptor
- int r = bsdiff(src->data, src->len, &(src->I), tgt->data, tgt->len, ptemp);
+ int r = bsdiff::bsdiff(src->data, src->len, tgt->data, tgt->len, ptemp, bsdiff_cache);
if (r != 0) {
printf("bsdiff() failed: %d\n", r);
return NULL;
@@ -660,7 +659,7 @@ unsigned char* MakePatch(ImageChunk* src, ImageChunk* tgt, size_t* size) {
size_t sz = static_cast<size_t>(st.st_size);
// TODO: Memory leak on error return.
- unsigned char* data = reinterpret_cast<unsigned char*>(malloc(sz));
+ unsigned char* data = static_cast<unsigned char*>(malloc(sz));
if (tgt->type == CHUNK_NORMAL && tgt->len <= sz) {
unlink(ptemp);
@@ -790,10 +789,8 @@ void MergeAdjacentNormalChunks(ImageChunk* chunks, int* num_chunks) {
*num_chunks = out;
}
-ImageChunk* FindChunkByName(const char* name,
- ImageChunk* chunks, int num_chunks) {
- int i;
- for (i = 0; i < num_chunks; ++i) {
+ImageChunk* FindChunkByName(const char* name, ImageChunk* chunks, int num_chunks) {
+ for (int i = 0; i < num_chunks; ++i) {
if (chunks[i].type == CHUNK_DEFLATE && chunks[i].filename &&
strcmp(name, chunks[i].filename) == 0) {
return chunks+i;
@@ -809,11 +806,11 @@ void DumpChunks(ImageChunk* chunks, int num_chunks) {
}
}
-int main(int argc, char** argv) {
- int zip_mode = 0;
+int imgdiff(int argc, const char** argv) {
+ bool zip_mode = false;
if (argc >= 2 && strcmp(argv[1], "-z") == 0) {
- zip_mode = 1;
+ zip_mode = true;
--argc;
++argv;
}
@@ -827,7 +824,7 @@ int main(int argc, char** argv) {
return 1;
}
bonus_size = st.st_size;
- bonus_data = reinterpret_cast<unsigned char*>(malloc(bonus_size));
+ bonus_data = static_cast<unsigned char*>(malloc(bonus_size));
FILE* f = fopen(argv[2], "rb");
if (f == NULL) {
printf("failed to open bonus file %s: %s\n", argv[2], strerror(errno));
@@ -844,7 +841,6 @@ int main(int argc, char** argv) {
}
if (argc != 4) {
- usage:
printf("usage: %s [-z] [-b <bonus-file>] <src-img> <tgt-img> <patch-file>\n",
argv[0]);
return 2;
@@ -878,12 +874,10 @@ int main(int argc, char** argv) {
// Verify that the source and target images have the same chunk
// structure (ie, the same sequence of deflate and normal chunks).
- if (!zip_mode) {
- // Merge the gzip header and footer in with any adjacent
- // normal chunks.
- MergeAdjacentNormalChunks(tgt_chunks, &num_tgt_chunks);
- MergeAdjacentNormalChunks(src_chunks, &num_src_chunks);
- }
+ // Merge the gzip header and footer in with any adjacent
+ // normal chunks.
+ MergeAdjacentNormalChunks(tgt_chunks, &num_tgt_chunks);
+ MergeAdjacentNormalChunks(src_chunks, &num_src_chunks);
if (num_src_chunks != num_tgt_chunks) {
printf("source and target don't have same number of chunks!\n");
@@ -895,8 +889,7 @@ int main(int argc, char** argv) {
}
for (i = 0; i < num_src_chunks; ++i) {
if (src_chunks[i].type != tgt_chunks[i].type) {
- printf("source and target don't have same chunk "
- "structure! (chunk %d)\n", i);
+ printf("source and target don't have same chunk structure! (chunk %d)\n", i);
printf("source chunks:\n");
DumpChunks(src_chunks, num_src_chunks);
printf("target chunks:\n");
@@ -974,33 +967,34 @@ int main(int argc, char** argv) {
DumpChunks(src_chunks, num_src_chunks);
printf("Construct patches for %d chunks...\n", num_tgt_chunks);
- unsigned char** patch_data = reinterpret_cast<unsigned char**>(malloc(
+ unsigned char** patch_data = static_cast<unsigned char**>(malloc(
num_tgt_chunks * sizeof(unsigned char*)));
- size_t* patch_size = reinterpret_cast<size_t*>(malloc(num_tgt_chunks * sizeof(size_t)));
+ size_t* patch_size = static_cast<size_t*>(malloc(num_tgt_chunks * sizeof(size_t)));
+ saidx_t* bsdiff_cache = nullptr;
for (i = 0; i < num_tgt_chunks; ++i) {
if (zip_mode) {
ImageChunk* src;
if (tgt_chunks[i].type == CHUNK_DEFLATE &&
- (src = FindChunkByName(tgt_chunks[i].filename, src_chunks,
- num_src_chunks))) {
- patch_data[i] = MakePatch(src, tgt_chunks+i, patch_size+i);
+ (src = FindChunkByName(tgt_chunks[i].filename, src_chunks, num_src_chunks))) {
+ patch_data[i] = MakePatch(src, tgt_chunks + i, patch_size + i, nullptr);
} else {
- patch_data[i] = MakePatch(src_chunks, tgt_chunks+i, patch_size+i);
+ patch_data[i] = MakePatch(src_chunks, tgt_chunks + i, patch_size + i, &bsdiff_cache);
}
} else {
if (i == 1 && bonus_data) {
printf(" using %zu bytes of bonus data for chunk %d\n", bonus_size, i);
- src_chunks[i].data = reinterpret_cast<unsigned char*>(realloc(src_chunks[i].data,
- src_chunks[i].len + bonus_size));
- memcpy(src_chunks[i].data+src_chunks[i].len, bonus_data, bonus_size);
+ src_chunks[i].data =
+ static_cast<unsigned char*>(realloc(src_chunks[i].data, src_chunks[i].len + bonus_size));
+ memcpy(src_chunks[i].data + src_chunks[i].len, bonus_data, bonus_size);
src_chunks[i].len += bonus_size;
- }
+ }
- patch_data[i] = MakePatch(src_chunks+i, tgt_chunks+i, patch_size+i);
+ patch_data[i] = MakePatch(src_chunks + i, tgt_chunks + i, patch_size + i, nullptr);
}
- printf("patch %3d is %zu bytes (of %zu)\n",
- i, patch_size[i], tgt_chunks[i].source_len);
+ printf("patch %3d is %zu bytes (of %zu)\n", i, patch_size[i], tgt_chunks[i].source_len);
}
+ free(bsdiff_cache);
+ free(src_chunks);
// Figure out how big the imgdiff file header is going to be, so
// that we can correctly compute the offset of each bsdiff patch
@@ -1077,6 +1071,10 @@ int main(int argc, char** argv) {
}
}
+ free(tgt_chunks);
+ free(patch_data);
+ free(patch_size);
+
fclose(f);
return 0;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 11:42:07 +0100