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bspatch: convert all err() and errx() calls to returns. am: b552c79a0d am: 27910bec29

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am: 59ac7b2e8e

Change-Id: I9939918d974bfa8ad211307688cf539fd4566d17
This commit is contained in:
Sen Jiang authored and android-build-merger committed 2017-02-16 21:26:45 +00:00
2 parents e4916dff22 59ac7b2e8e
commit fa5b9458c6
1 file changed
+141 -72
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bspatch.cc
+141 -72
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@@ -31,7 +31,6 @@ __FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:
#include "bspatch.h"
#include <bzlib.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
@@ -95,20 +94,24 @@ bool ReadBZ2(bz_stream* stream, uint8_t* data, size_t size) {
return true;
}
bool ReadBZ2AndWriteAll(const std::unique_ptr<bsdiff::FileInterface>& file,
bz_stream* stream,
size_t size,
uint8_t* buf,
size_t buf_size) {
int ReadBZ2AndWriteAll(const std::unique_ptr<bsdiff::FileInterface>& file,
bz_stream* stream,
size_t size,
uint8_t* buf,
size_t buf_size) {
while (size > 0) {
size_t bytes_to_read = std::min(size, buf_size);
if (!ReadBZ2(stream, buf, bytes_to_read))
return false;
if (!WriteAll(file, buf, bytes_to_read))
return false;
if (!ReadBZ2(stream, buf, bytes_to_read)) {
fprintf(stderr, "Failed to read bzip stream.\n");
return 2;
}
if (!WriteAll(file, buf, bytes_to_read)) {
perror("WriteAll() failed");
return 1;
}
size -= bytes_to_read;
}
return true;
return 0;
}
} // namespace
@@ -147,10 +150,15 @@ bool IsOverlapping(const char* old_filename,
if (stat(new_filename, &new_stat) == -1) {
if (errno == ENOENT)
return false;
err(1, "Error stat the new filename %s", new_filename);
fprintf(stderr, "Error stat the new file %s: %s\n", new_filename,
strerror(errno));
return true;
}
if (stat(old_filename, &old_stat) == -1) {
fprintf(stderr, "Error stat the old file %s: %s\n", old_filename,
strerror(errno));
return true;
}
if (stat(old_filename, &old_stat) == -1)
err(1, "Error stat the old filename %s", old_filename);
if (old_stat.st_dev != new_stat.st_dev || old_stat.st_ino != new_stat.st_ino)
return false;
@@ -167,45 +175,66 @@ bool IsOverlapping(const char* old_filename,
return false;
}
int bspatch(
const char* old_filename, const char* new_filename,
const char* patch_filename,
const char* old_extents, const char* new_extents) {
// Patch |old_filename| with |patch_filename| and save it to |new_filename|.
// |old_extents| and |new_extents| are comma-separated lists of "offset:length"
// extents of |old_filename| and |new_filename|.
// Returns 0 on success, 1 on I/O error and 2 on data error.
int bspatch(const char* old_filename,
const char* new_filename,
const char* patch_filename,
const char* old_extents,
const char* new_extents) {
std::unique_ptr<FileInterface> patch_file =
File::FOpen(patch_filename, O_RDONLY);
if (!patch_file)
err(1, "Error opening the patch filename %s", patch_filename);
if (!patch_file) {
fprintf(stderr, "Error opening the patch file %s: %s\n", patch_filename,
strerror(errno));
return 1;
}
uint64_t patch_size;
patch_file->GetSize(&patch_size);
std::vector<uint8_t> patch(patch_size);
if (!ReadAll(patch_file, patch.data(), patch_size))
errx(1, "Corrupt patch\n");
if (!ReadAll(patch_file, patch.data(), patch_size)) {
fprintf(stderr, "Error reading the patch file %s: %s\n", patch_filename,
strerror(errno));
return 1;
}
patch_file.reset();
int using_extents = (old_extents != NULL || new_extents != NULL);
// Open input file for reading.
std::unique_ptr<FileInterface> old_file = File::FOpen(old_filename, O_RDONLY);
if (!old_file)
err(1, "Error opening the old filename %s", old_filename);
if (!old_file) {
fprintf(stderr, "Error opening the old file %s: %s\n", old_filename,
strerror(errno));
return 1;
}
std::vector<ex_t> parsed_old_extents;
if (using_extents) {
if (!ParseExtentStr(old_extents, &parsed_old_extents))
errx(1, "Error parsing the old extents");
if (!ParseExtentStr(old_extents, &parsed_old_extents)) {
fprintf(stderr, "Error parsing the old extents\n");
return 2;
}
old_file.reset(new ExtentsFile(std::move(old_file), parsed_old_extents));
}
// Open output file for writing.
std::unique_ptr<FileInterface> new_file =
File::FOpen(new_filename, O_CREAT | O_WRONLY);
if (!new_file)
err(1, "Error opening the new filename %s", new_filename);
if (!new_file) {
fprintf(stderr, "Error opening the new file %s: %s\n", new_filename,
strerror(errno));
return 1;
}
std::vector<ex_t> parsed_new_extents;
if (using_extents) {
if (!ParseExtentStr(new_extents, &parsed_new_extents))
errx(1, "Error parsing the new extents");
if (!ParseExtentStr(new_extents, &parsed_new_extents)) {
fprintf(stderr, "Error parsing the new extents\n");
return 2;
}
new_file.reset(new ExtentsFile(std::move(new_file), parsed_new_extents));
}
@@ -220,6 +249,8 @@ int bspatch(
return bspatch(old_file, new_file, patch.data(), patch_size);
}
// Patch |old_data| with |patch_data| and save it by calling sink function.
// Returns 0 on success, 1 on I/O error and 2 on data error.
int bspatch(const uint8_t* old_data,
size_t old_size,
const uint8_t* patch_data,
@@ -231,6 +262,8 @@ int bspatch(const uint8_t* old_data,
return bspatch(old_file, new_file, patch_data, patch_size);
}
// Patch |old_file| with |patch_data| and save it to |new_file|.
// Returns 0 on success, 1 on I/O error and 2 on data error.
int bspatch(const std::unique_ptr<FileInterface>& old_file,
const std::unique_ptr<FileInterface>& new_file,
const uint8_t* patch_data,
@@ -252,8 +285,10 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
// extra block; seek forwards in oldfile by z bytes".
// Check for appropriate magic.
if (memcmp(patch_data, "BSDIFF40", 8) != 0)
errx(1, "Corrupt patch\n");
if (memcmp(patch_data, "BSDIFF40", 8) != 0) {
fprintf(stderr, "Not a bsdiff patch.\n");
return 2;
}
// Read lengths from header.
uint64_t oldsize, newsize;
@@ -262,8 +297,10 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
int64_t signed_newsize = ParseInt64(patch_data + 24);
newsize = signed_newsize;
if ((ctrl_len < 0) || (data_len < 0) || (signed_newsize < 0) ||
(32 + ctrl_len + data_len > static_cast<int64_t>(patch_size)))
errx(1, "Corrupt patch\n");
(32 + ctrl_len + data_len > static_cast<int64_t>(patch_size))) {
fprintf(stderr, "Corrupt patch.\n");
return 2;
}
bz_stream cstream;
cstream.next_in = (char*)patch_data + 32;
@@ -271,8 +308,10 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
cstream.bzalloc = nullptr;
cstream.bzfree = nullptr;
cstream.opaque = nullptr;
if ((bz2err = BZ2_bzDecompressInit(&cstream, 0, 0)) != BZ_OK)
errx(1, "failed to bzinit control stream (%d)\n", bz2err);
if ((bz2err = BZ2_bzDecompressInit(&cstream, 0, 0)) != BZ_OK) {
fprintf(stderr, "Failed to bzinit control stream (%d)\n", bz2err);
return 2;
}
bz_stream dstream;
dstream.next_in = (char*)patch_data + 32 + ctrl_len;
@@ -280,8 +319,10 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
dstream.bzalloc = nullptr;
dstream.bzfree = nullptr;
dstream.opaque = nullptr;
if ((bz2err = BZ2_bzDecompressInit(&dstream, 0, 0)) != BZ_OK)
errx(1, "failed to bzinit diff stream (%d)\n", bz2err);
if ((bz2err = BZ2_bzDecompressInit(&dstream, 0, 0)) != BZ_OK) {
fprintf(stderr, "Failed to bzinit diff stream (%d)\n", bz2err);
return 2;
}
bz_stream estream;
estream.next_in = (char*)patch_data + 32 + ctrl_len + data_len;
@@ -289,13 +330,17 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
estream.bzalloc = nullptr;
estream.bzfree = nullptr;
estream.opaque = nullptr;
if ((bz2err = BZ2_bzDecompressInit(&estream, 0, 0)) != BZ_OK)
errx(1, "failed to bzinit extra stream (%d)\n", bz2err);
if ((bz2err = BZ2_bzDecompressInit(&estream, 0, 0)) != BZ_OK) {
fprintf(stderr, "Failed to bzinit extra stream (%d)\n", bz2err);
return 2;
}
uint64_t old_file_pos = 0;
if (!old_file->GetSize(&oldsize))
err(1, "cannot obtain the size of old file");
if (!old_file->GetSize(&oldsize)) {
fprintf(stderr, "Cannot obtain the size of old file.\n");
return 1;
}
// The oldpos can be negative, but the new pos is only incremented linearly.
int64_t oldpos = 0;
@@ -305,34 +350,44 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
int64_t i;
// Read control data.
for (i = 0; i <= 2; i++) {
if (!ReadBZ2(&cstream, buf, 8))
errx(1, "Corrupt patch\n");
if (!ReadBZ2(&cstream, buf, 8)) {
fprintf(stderr, "Failed to read control stream.\n");
return 2;
}
ctrl[i] = ParseInt64(buf);
}
// Sanity-check.
if (ctrl[0] < 0 || ctrl[1] < 0)
errx(1, "Corrupt patch\n");
if (ctrl[0] < 0 || ctrl[1] < 0) {
fprintf(stderr, "Corrupt patch.\n");
return 2;
}
// Sanity-check.
if (newpos + ctrl[0] > newsize)
errx(1, "Corrupt patch\n");
if (newpos + ctrl[0] > newsize) {
fprintf(stderr, "Corrupt patch.\n");
return 2;
}
int ret = 0;
// Add old data to diff string. It is enough to fseek once, at
// the beginning of the sequence, to avoid unnecessary overhead.
if ((i = oldpos) < 0) {
// Write diff block directly to new file without adding old data,
// because we will skip part where |oldpos| < 0.
if (!ReadBZ2AndWriteAll(new_file, &dstream, -i, new_buf.data(),
new_buf.size()))
errx(1, "Error during ReadBZ2AndWriteAll()");
ret = ReadBZ2AndWriteAll(new_file, &dstream, -i, new_buf.data(),
new_buf.size());
if (ret)
return ret;
i = 0;
}
// We just checked that |i| is not negative.
if (static_cast<uint64_t>(i) != old_file_pos && !old_file->Seek(i))
err(1, "error seeking input file to offset %" PRId64, i);
if (static_cast<uint64_t>(i) != old_file_pos && !old_file->Seek(i)) {
fprintf(stderr, "Error seeking input file to offset %" PRId64 ": %s\n", i,
strerror(errno));
return 1;
}
if ((old_file_pos = oldpos + ctrl[0]) > oldsize)
old_file_pos = oldsize;
@@ -340,18 +395,26 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
while (chunk_size > 0) {
size_t read_bytes;
size_t bytes_to_read = std::min(chunk_size, old_buf.size());
if (!old_file->Read(old_buf.data(), bytes_to_read, &read_bytes))
err(1, "error reading from input file");
if (!read_bytes)
errx(1, "EOF reached while reading from input file");
if (!old_file->Read(old_buf.data(), bytes_to_read, &read_bytes)) {
perror("Error reading from input file");
return 1;
}
if (!read_bytes) {
fprintf(stderr, "EOF reached while reading from input file.\n");
return 2;
}
// Read same amount of bytes from diff block
if (!ReadBZ2(&dstream, new_buf.data(), read_bytes))
errx(1, "Corrupt patch\n");
if (!ReadBZ2(&dstream, new_buf.data(), read_bytes)) {
fprintf(stderr, "Failed to read diff stream.\n");
return 2;
}
// new_buf already has data from diff block, adds old data to it.
for (size_t k = 0; k < read_bytes; k++)
new_buf[k] += old_buf[k];
if (!WriteAll(new_file, new_buf.data(), read_bytes))
err(1, "Error writing new file.");
if (!WriteAll(new_file, new_buf.data(), read_bytes)) {
perror("Error writing to new file");
return 1;
}
chunk_size -= read_bytes;
}
@@ -362,19 +425,23 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
if (oldpos > static_cast<int64_t>(oldsize)) {
// Write diff block directly to new file without adding old data,
// because we skipped part where |oldpos| > oldsize.
if (!ReadBZ2AndWriteAll(new_file, &dstream, oldpos - oldsize,
new_buf.data(), new_buf.size()))
errx(1, "Error during ReadBZ2AndWriteAll()");
ret = ReadBZ2AndWriteAll(new_file, &dstream, oldpos - oldsize,
new_buf.data(), new_buf.size());
if (ret)
return ret;
}
// Sanity-check.
if (newpos + ctrl[1] > newsize)
errx(1, "Corrupt patch\n");
if (newpos + ctrl[1] > newsize) {
fprintf(stderr, "Corrupt patch.\n");
return 2;
}
// Read extra block.
if (!ReadBZ2AndWriteAll(new_file, &estream, ctrl[1], new_buf.data(),
new_buf.size()))
errx(1, "Error during ReadBZ2AndWriteAll()");
ret = ReadBZ2AndWriteAll(new_file, &estream, ctrl[1], new_buf.data(),
new_buf.size());
if (ret)
return ret;
// Adjust pointers.
newpos += ctrl[1];
@@ -389,8 +456,10 @@ int bspatch(const std::unique_ptr<FileInterface>& old_file,
BZ2_bzDecompressEnd(&dstream);
BZ2_bzDecompressEnd(&estream);
if (!new_file->Close())
err(1, "Error closing new file");
if (!new_file->Close()) {
perror("Error closing new file");
return 1;
}
return 0;
}