Change the internal representation in RangeSet.
This CL makes the following changes to RangeSet:
- Uses std::pair<size_t, size_t> to represent a Range;
- Uses std::vector<Range> to represent a RangeSet;
- Provides const iterators (forward and reverse);
- Provides const accessor;
- 'blocks()' returns the number of blocks (formerly 'size');
- 'size()' returns the number of Range's (formerly 'count').
Test: recovery_unit_test
Test: Apply an incremental update with the new updater.
Change-Id: Ia1fbb343370a152e1f7aa050cf914c2da09b1396
diff --git a/tests/unit/rangeset_test.cpp b/tests/unit/rangeset_test.cpp
index e66da20..3c6d77e 100644
--- a/tests/unit/rangeset_test.cpp
+++ b/tests/unit/rangeset_test.cpp
@@ -25,14 +25,15 @@
TEST(RangeSetTest, Parse_smoke) {
RangeSet rs = RangeSet::Parse("2,1,10");
- ASSERT_EQ(static_cast<size_t>(1), rs.count);
- ASSERT_EQ((std::vector<size_t>{ 1, 10 }), rs.pos);
- ASSERT_EQ(static_cast<size_t>(9), rs.size);
+ ASSERT_EQ(static_cast<size_t>(1), rs.size());
+ ASSERT_EQ((Range{ 1, 10 }), rs[0]);
+ ASSERT_EQ(static_cast<size_t>(9), rs.blocks());
RangeSet rs2 = RangeSet::Parse("4,15,20,1,10");
- ASSERT_EQ(static_cast<size_t>(2), rs2.count);
- ASSERT_EQ((std::vector<size_t>{ 15, 20, 1, 10 }), rs2.pos);
- ASSERT_EQ(static_cast<size_t>(14), rs2.size);
+ ASSERT_EQ(static_cast<size_t>(2), rs2.size());
+ ASSERT_EQ((Range{ 15, 20 }), rs2[0]);
+ ASSERT_EQ((Range{ 1, 10 }), rs2[1]);
+ ASSERT_EQ(static_cast<size_t>(14), rs2.blocks());
// Leading zeros are fine. But android::base::ParseUint() doesn't like trailing zeros like "10 ".
ASSERT_EQ(rs, RangeSet::Parse(" 2, 1, 10"));
@@ -82,3 +83,30 @@
// Out of bound.
ASSERT_EXIT(rs.GetBlockNumber(9), ::testing::KilledBySignal(SIGABRT), "");
}
+
+TEST(RangeSetTest, equality) {
+ ASSERT_EQ(RangeSet::Parse("2,1,6"), RangeSet::Parse("2,1,6"));
+
+ ASSERT_NE(RangeSet::Parse("2,1,6"), RangeSet::Parse("2,1,7"));
+ ASSERT_NE(RangeSet::Parse("2,1,6"), RangeSet::Parse("2,2,7"));
+
+ // The orders of Range's matter. "4,1,5,8,10" != "4,8,10,1,5".
+ ASSERT_NE(RangeSet::Parse("4,1,5,8,10"), RangeSet::Parse("4,8,10,1,5"));
+}
+
+TEST(RangeSetTest, iterators) {
+ RangeSet rs = RangeSet::Parse("4,1,5,8,10");
+ std::vector<Range> ranges;
+ for (const auto& range : rs) {
+ ranges.push_back(range);
+ }
+ ASSERT_EQ((std::vector<Range>{ Range{ 1, 5 }, Range{ 8, 10 } }), ranges);
+
+ ranges.clear();
+
+ // Reverse iterators.
+ for (auto it = rs.crbegin(); it != rs.crend(); it++) {
+ ranges.push_back(*it);
+ }
+ ASSERT_EQ((std::vector<Range>{ Range{ 8, 10 }, Range{ 1, 5 } }), ranges);
+}
diff --git a/updater/blockimg.cpp b/updater/blockimg.cpp
index 8199447..0f08d17 100644
--- a/updater/blockimg.cpp
+++ b/updater/blockimg.cpp
@@ -112,18 +112,17 @@
}
static bool discard_blocks(int fd, off64_t offset, uint64_t size) {
- // Don't discard blocks unless the update is a retry run.
- if (!is_retry) {
- return true;
- }
-
- uint64_t args[2] = {static_cast<uint64_t>(offset), size};
- int status = ioctl(fd, BLKDISCARD, &args);
- if (status == -1) {
- PLOG(ERROR) << "BLKDISCARD ioctl failed";
- return false;
- }
+ // Don't discard blocks unless the update is a retry run.
+ if (!is_retry) {
return true;
+ }
+
+ uint64_t args[2] = { static_cast<uint64_t>(offset), size };
+ if (ioctl(fd, BLKDISCARD, &args) == -1) {
+ PLOG(ERROR) << "BLKDISCARD ioctl failed";
+ return false;
+ }
+ return true;
}
static bool check_lseek(int fd, off64_t offset, int whence) {
@@ -151,11 +150,11 @@
public:
RangeSinkWriter(int fd, const RangeSet& tgt)
: fd_(fd), tgt_(tgt), next_range_(0), current_range_left_(0) {
- CHECK_NE(tgt.count, static_cast<size_t>(0));
+ CHECK_NE(tgt.size(), static_cast<size_t>(0));
};
bool Finished() const {
- return next_range_ == tgt_.count && current_range_left_ == 0;
+ return next_range_ == tgt_.size() && current_range_left_ == 0;
}
size_t Write(const uint8_t* data, size_t size) {
@@ -168,10 +167,10 @@
while (size > 0) {
// Move to the next range as needed.
if (current_range_left_ == 0) {
- if (next_range_ < tgt_.count) {
- off64_t offset = static_cast<off64_t>(tgt_.pos[next_range_ * 2]) * BLOCKSIZE;
- current_range_left_ =
- (tgt_.pos[next_range_ * 2 + 1] - tgt_.pos[next_range_ * 2]) * BLOCKSIZE;
+ if (next_range_ < tgt_.size()) {
+ const Range& range = tgt_[next_range_];
+ off64_t offset = static_cast<off64_t>(range.first) * BLOCKSIZE;
+ current_range_left_ = (range.second - range.first) * BLOCKSIZE;
next_range_++;
if (!discard_blocks(fd_, offset, current_range_left_)) {
break;
@@ -281,31 +280,28 @@
}
static int ReadBlocks(const RangeSet& src, std::vector<uint8_t>& buffer, int fd) {
- size_t p = 0;
- uint8_t* data = buffer.data();
-
- for (size_t i = 0; i < src.count; ++i) {
- if (!check_lseek(fd, (off64_t) src.pos[i * 2] * BLOCKSIZE, SEEK_SET)) {
- return -1;
- }
-
- size_t size = (src.pos[i * 2 + 1] - src.pos[i * 2]) * BLOCKSIZE;
-
- if (read_all(fd, data + p, size) == -1) {
- return -1;
- }
-
- p += size;
+ size_t p = 0;
+ for (const auto& range : src) {
+ if (!check_lseek(fd, static_cast<off64_t>(range.first) * BLOCKSIZE, SEEK_SET)) {
+ return -1;
}
- return 0;
+ size_t size = (range.second - range.first) * BLOCKSIZE;
+ if (read_all(fd, buffer.data() + p, size) == -1) {
+ return -1;
+ }
+
+ p += size;
+ }
+
+ return 0;
}
static int WriteBlocks(const RangeSet& tgt, const std::vector<uint8_t>& buffer, int fd) {
size_t written = 0;
- for (size_t i = 0; i < tgt.count; ++i) {
- off64_t offset = static_cast<off64_t>(tgt.pos[i * 2]) * BLOCKSIZE;
- size_t size = (tgt.pos[i * 2 + 1] - tgt.pos[i * 2]) * BLOCKSIZE;
+ for (const auto& range : tgt) {
+ off64_t offset = static_cast<off64_t>(range.first) * BLOCKSIZE;
+ size_t size = (range.second - range.first) * BLOCKSIZE;
if (!discard_blocks(fd, offset, size)) {
return -1;
}
@@ -386,21 +382,18 @@
// If there's no stashed blocks, content in the buffer is consecutive and has the same
// order as the source blocks.
if (pos == params.tokens.size()) {
- locs.count = 1;
- locs.size = src.size;
- locs.pos = { 0, src.size };
+ locs = RangeSet(std::vector<Range>{ Range{ 0, src.blocks() } });
} else {
// Otherwise, the next token is the offset of the source blocks in the target range.
// Example: for the tokens <4,63946,63947,63948,63979> <4,6,7,8,39> <stashed_blocks>;
// We want to print SHA-1 for the data in buffer[6], buffer[8], buffer[9] ... buffer[38];
// this corresponds to the 32 src blocks #63946, #63948, #63949 ... #63978.
locs = RangeSet::Parse(params.tokens[pos++]);
- CHECK_EQ(src.size, locs.size);
- CHECK_EQ(locs.pos.size() % 2, static_cast<size_t>(0));
+ CHECK_EQ(src.blocks(), locs.blocks());
}
- LOG(INFO) << "printing hash in hex for " << src.size << " source blocks";
- for (size_t i = 0; i < src.size; i++) {
+ LOG(INFO) << "printing hash in hex for " << src.blocks() << " source blocks";
+ for (size_t i = 0; i < src.blocks(); i++) {
size_t block_num = src.GetBlockNumber(i);
size_t buffer_index = locs.GetBlockNumber(i);
CHECK_LE((buffer_index + 1) * BLOCKSIZE, buffer.size());
@@ -418,9 +411,9 @@
const std::vector<uint8_t>& buffer,
const RangeSet& src) {
LOG(INFO) << "printing hash in hex for stash_id: " << id;
- CHECK_EQ(src.size * BLOCKSIZE, buffer.size());
+ CHECK_EQ(src.blocks() * BLOCKSIZE, buffer.size());
- for (size_t i = 0; i < src.size; i++) {
+ for (size_t i = 0; i < src.blocks(); i++) {
size_t block_num = src.GetBlockNumber(i);
uint8_t digest[SHA_DIGEST_LENGTH];
@@ -440,7 +433,7 @@
LOG(INFO) << "print hash in hex for source blocks in missing stash: " << id;
const RangeSet& src = stash_map[id];
- std::vector<uint8_t> buffer(src.size * BLOCKSIZE);
+ std::vector<uint8_t> buffer(src.blocks() * BLOCKSIZE);
if (ReadBlocks(src, buffer, fd) == -1) {
LOG(ERROR) << "failed to read source blocks for stash: " << id;
return;
@@ -532,81 +525,77 @@
static int LoadStash(CommandParameters& params, const std::string& id, bool verify, size_t* blocks,
std::vector<uint8_t>& buffer, bool printnoent) {
- // In verify mode, if source range_set was saved for the given hash,
- // check contents in the source blocks first. If the check fails,
- // search for the stashed files on /cache as usual.
- if (!params.canwrite) {
- if (stash_map.find(id) != stash_map.end()) {
- const RangeSet& src = stash_map[id];
- allocate(src.size * BLOCKSIZE, buffer);
+ // In verify mode, if source range_set was saved for the given hash, check contents in the source
+ // blocks first. If the check fails, search for the stashed files on /cache as usual.
+ if (!params.canwrite) {
+ if (stash_map.find(id) != stash_map.end()) {
+ const RangeSet& src = stash_map[id];
+ allocate(src.blocks() * BLOCKSIZE, buffer);
- if (ReadBlocks(src, buffer, params.fd) == -1) {
- LOG(ERROR) << "failed to read source blocks in stash map.";
- return -1;
- }
- if (VerifyBlocks(id, buffer, src.size, true) != 0) {
- LOG(ERROR) << "failed to verify loaded source blocks in stash map.";
- PrintHashForCorruptedStashedBlocks(id, buffer, src);
- return -1;
- }
- return 0;
- }
- }
-
- size_t blockcount = 0;
-
- if (!blocks) {
- blocks = &blockcount;
- }
-
- std::string fn = GetStashFileName(params.stashbase, id, "");
-
- struct stat sb;
- int res = stat(fn.c_str(), &sb);
-
- if (res == -1) {
- if (errno != ENOENT || printnoent) {
- PLOG(ERROR) << "stat \"" << fn << "\" failed";
- PrintHashForMissingStashedBlocks(id, params.fd);
- }
+ if (ReadBlocks(src, buffer, params.fd) == -1) {
+ LOG(ERROR) << "failed to read source blocks in stash map.";
return -1;
- }
-
- LOG(INFO) << " loading " << fn;
-
- if ((sb.st_size % BLOCKSIZE) != 0) {
- LOG(ERROR) << fn << " size " << sb.st_size << " not multiple of block size " << BLOCKSIZE;
+ }
+ if (VerifyBlocks(id, buffer, src.blocks(), true) != 0) {
+ LOG(ERROR) << "failed to verify loaded source blocks in stash map.";
+ PrintHashForCorruptedStashedBlocks(id, buffer, src);
return -1;
+ }
+ return 0;
}
+ }
- android::base::unique_fd fd(TEMP_FAILURE_RETRY(ota_open(fn.c_str(), O_RDONLY)));
- if (fd == -1) {
- PLOG(ERROR) << "open \"" << fn << "\" failed";
- return -1;
+ size_t blockcount = 0;
+ if (!blocks) {
+ blocks = &blockcount;
+ }
+
+ std::string fn = GetStashFileName(params.stashbase, id, "");
+
+ struct stat sb;
+ if (stat(fn.c_str(), &sb) == -1) {
+ if (errno != ENOENT || printnoent) {
+ PLOG(ERROR) << "stat \"" << fn << "\" failed";
+ PrintHashForMissingStashedBlocks(id, params.fd);
}
+ return -1;
+ }
- allocate(sb.st_size, buffer);
+ LOG(INFO) << " loading " << fn;
- if (read_all(fd, buffer, sb.st_size) == -1) {
- return -1;
+ if ((sb.st_size % BLOCKSIZE) != 0) {
+ LOG(ERROR) << fn << " size " << sb.st_size << " not multiple of block size " << BLOCKSIZE;
+ return -1;
+ }
+
+ android::base::unique_fd fd(TEMP_FAILURE_RETRY(ota_open(fn.c_str(), O_RDONLY)));
+ if (fd == -1) {
+ PLOG(ERROR) << "open \"" << fn << "\" failed";
+ return -1;
+ }
+
+ allocate(sb.st_size, buffer);
+
+ if (read_all(fd, buffer, sb.st_size) == -1) {
+ return -1;
+ }
+
+ *blocks = sb.st_size / BLOCKSIZE;
+
+ if (verify && VerifyBlocks(id, buffer, *blocks, true) != 0) {
+ LOG(ERROR) << "unexpected contents in " << fn;
+ if (stash_map.find(id) == stash_map.end()) {
+ LOG(ERROR) << "failed to find source blocks number for stash " << id
+ << " when executing command: " << params.cmdname;
+ } else {
+ const RangeSet& src = stash_map[id];
+ PrintHashForCorruptedStashedBlocks(id, buffer, src);
}
+ DeleteFile(fn);
+ return -1;
+ }
- *blocks = sb.st_size / BLOCKSIZE;
-
- if (verify && VerifyBlocks(id, buffer, *blocks, true) != 0) {
- LOG(ERROR) << "unexpected contents in " << fn;
- if (stash_map.find(id) == stash_map.end()) {
- LOG(ERROR) << "failed to find source blocks number for stash " << id
- << " when executing command: " << params.cmdname;
- } else {
- const RangeSet& src = stash_map[id];
- PrintHashForCorruptedStashedBlocks(id, buffer, src);
- }
- DeleteFile(fn);
- return -1;
- }
-
- return 0;
+ return 0;
}
static int WriteStash(const std::string& base, const std::string& id, int blocks,
@@ -780,21 +769,19 @@
return 0;
}
+// Source contains packed data, which we want to move to the locations given in locs in the dest
+// buffer. source and dest may be the same buffer.
static void MoveRange(std::vector<uint8_t>& dest, const RangeSet& locs,
- const std::vector<uint8_t>& source) {
- // source contains packed data, which we want to move to the
- // locations given in locs in the dest buffer. source and dest
- // may be the same buffer.
-
- const uint8_t* from = source.data();
- uint8_t* to = dest.data();
- size_t start = locs.size;
- for (int i = locs.count-1; i >= 0; --i) {
- size_t blocks = locs.pos[i*2+1] - locs.pos[i*2];
- start -= blocks;
- memmove(to + (locs.pos[i*2] * BLOCKSIZE), from + (start * BLOCKSIZE),
- blocks * BLOCKSIZE);
- }
+ const std::vector<uint8_t>& source) {
+ const uint8_t* from = source.data();
+ uint8_t* to = dest.data();
+ size_t start = locs.blocks();
+ // Must do the movement backward.
+ for (auto it = locs.crbegin(); it != locs.crend(); it++) {
+ size_t blocks = it->second - it->first;
+ start -= blocks;
+ memmove(to + (it->first * BLOCKSIZE), from + (start * BLOCKSIZE), blocks * BLOCKSIZE);
+ }
}
/**
@@ -933,13 +920,13 @@
// <tgt_range>
tgt = RangeSet::Parse(params.tokens[params.cpos++]);
- std::vector<uint8_t> tgtbuffer(tgt.size * BLOCKSIZE);
+ std::vector<uint8_t> tgtbuffer(tgt.blocks() * BLOCKSIZE);
if (ReadBlocks(tgt, tgtbuffer, params.fd) == -1) {
return -1;
}
// Return now if target blocks already have expected content.
- if (VerifyBlocks(tgthash, tgtbuffer, tgt.size, false) == 0) {
+ if (VerifyBlocks(tgthash, tgtbuffer, tgt.blocks(), false) == 0) {
return 1;
}
@@ -1023,7 +1010,7 @@
params.freestash.clear();
}
- params.written += tgt.size;
+ params.written += tgt.blocks();
return 0;
}
@@ -1045,11 +1032,11 @@
RangeSet src = RangeSet::Parse(params.tokens[params.cpos++]);
- allocate(src.size * BLOCKSIZE, params.buffer);
+ allocate(src.blocks() * BLOCKSIZE, params.buffer);
if (ReadBlocks(src, params.buffer, params.fd) == -1) {
return -1;
}
- blocks = src.size;
+ blocks = src.blocks();
stash_map[id] = src;
if (VerifyBlocks(id, params.buffer, blocks, true) != 0) {
@@ -1088,46 +1075,45 @@
}
static int PerformCommandZero(CommandParameters& params) {
+ if (params.cpos >= params.tokens.size()) {
+ LOG(ERROR) << "missing target blocks for zero";
+ return -1;
+ }
- if (params.cpos >= params.tokens.size()) {
- LOG(ERROR) << "missing target blocks for zero";
+ RangeSet tgt = RangeSet::Parse(params.tokens[params.cpos++]);
+
+ LOG(INFO) << " zeroing " << tgt.blocks() << " blocks";
+
+ allocate(BLOCKSIZE, params.buffer);
+ memset(params.buffer.data(), 0, BLOCKSIZE);
+
+ if (params.canwrite) {
+ for (const auto& range : tgt) {
+ off64_t offset = static_cast<off64_t>(range.first) * BLOCKSIZE;
+ size_t size = (range.second - range.first) * BLOCKSIZE;
+ if (!discard_blocks(params.fd, offset, size)) {
return -1;
- }
+ }
- RangeSet tgt = RangeSet::Parse(params.tokens[params.cpos++]);
+ if (!check_lseek(params.fd, offset, SEEK_SET)) {
+ return -1;
+ }
- LOG(INFO) << " zeroing " << tgt.size << " blocks";
-
- allocate(BLOCKSIZE, params.buffer);
- memset(params.buffer.data(), 0, BLOCKSIZE);
-
- if (params.canwrite) {
- for (size_t i = 0; i < tgt.count; ++i) {
- off64_t offset = static_cast<off64_t>(tgt.pos[i * 2]) * BLOCKSIZE;
- size_t size = (tgt.pos[i * 2 + 1] - tgt.pos[i * 2]) * BLOCKSIZE;
- if (!discard_blocks(params.fd, offset, size)) {
- return -1;
- }
-
- if (!check_lseek(params.fd, offset, SEEK_SET)) {
- return -1;
- }
-
- for (size_t j = tgt.pos[i * 2]; j < tgt.pos[i * 2 + 1]; ++j) {
- if (write_all(params.fd, params.buffer, BLOCKSIZE) == -1) {
- return -1;
- }
- }
+ for (size_t j = range.first; j < range.second; ++j) {
+ if (write_all(params.fd, params.buffer, BLOCKSIZE) == -1) {
+ return -1;
}
+ }
}
+ }
- if (params.cmdname[0] == 'z') {
- // Update only for the zero command, as the erase command will call
- // this if DEBUG_ERASE is defined.
- params.written += tgt.size;
- }
+ if (params.cmdname[0] == 'z') {
+ // Update only for the zero command, as the erase command will call
+ // this if DEBUG_ERASE is defined.
+ params.written += tgt.blocks();
+ }
- return 0;
+ return 0;
}
static int PerformCommandNew(CommandParameters& params) {
@@ -1139,7 +1125,7 @@
RangeSet tgt = RangeSet::Parse(params.tokens[params.cpos++]);
if (params.canwrite) {
- LOG(INFO) << " writing " << tgt.size << " blocks of new data";
+ LOG(INFO) << " writing " << tgt.blocks() << " blocks of new data";
RangeSinkWriter writer(params.fd, tgt);
pthread_mutex_lock(¶ms.nti.mu);
@@ -1153,7 +1139,7 @@
pthread_mutex_unlock(¶ms.nti.mu);
}
- params.written += tgt.size;
+ params.written += tgt.blocks();
return 0;
}
@@ -1195,7 +1181,7 @@
if (params.canwrite) {
if (status == 0) {
- LOG(INFO) << "patching " << blocks << " blocks to " << tgt.size;
+ LOG(INFO) << "patching " << blocks << " blocks to " << tgt.blocks();
Value patch_value(
VAL_BLOB, std::string(reinterpret_cast<const char*>(params.patch_start + offset), len));
@@ -1223,7 +1209,7 @@
LOG(ERROR) << "range sink underrun?";
}
} else {
- LOG(INFO) << "skipping " << blocks << " blocks already patched to " << tgt.size << " ["
+ LOG(INFO) << "skipping " << blocks << " blocks already patched to " << tgt.blocks() << " ["
<< params.cmdline << "]";
}
}
@@ -1233,52 +1219,52 @@
params.freestash.clear();
}
- params.written += tgt.size;
+ params.written += tgt.blocks();
return 0;
}
static int PerformCommandErase(CommandParameters& params) {
- if (DEBUG_ERASE) {
- return PerformCommandZero(params);
- }
+ if (DEBUG_ERASE) {
+ return PerformCommandZero(params);
+ }
- struct stat sb;
- if (fstat(params.fd, &sb) == -1) {
- PLOG(ERROR) << "failed to fstat device to erase";
+ struct stat sb;
+ if (fstat(params.fd, &sb) == -1) {
+ PLOG(ERROR) << "failed to fstat device to erase";
+ return -1;
+ }
+
+ if (!S_ISBLK(sb.st_mode)) {
+ LOG(ERROR) << "not a block device; skipping erase";
+ return -1;
+ }
+
+ if (params.cpos >= params.tokens.size()) {
+ LOG(ERROR) << "missing target blocks for erase";
+ return -1;
+ }
+
+ RangeSet tgt = RangeSet::Parse(params.tokens[params.cpos++]);
+
+ if (params.canwrite) {
+ LOG(INFO) << " erasing " << tgt.blocks() << " blocks";
+
+ for (const auto& range : tgt) {
+ uint64_t blocks[2];
+ // offset in bytes
+ blocks[0] = range.first * static_cast<uint64_t>(BLOCKSIZE);
+ // length in bytes
+ blocks[1] = (range.second - range.first) * static_cast<uint64_t>(BLOCKSIZE);
+
+ if (ioctl(params.fd, BLKDISCARD, &blocks) == -1) {
+ PLOG(ERROR) << "BLKDISCARD ioctl failed";
return -1;
+ }
}
+ }
- if (!S_ISBLK(sb.st_mode)) {
- LOG(ERROR) << "not a block device; skipping erase";
- return -1;
- }
-
- if (params.cpos >= params.tokens.size()) {
- LOG(ERROR) << "missing target blocks for erase";
- return -1;
- }
-
- RangeSet tgt = RangeSet::Parse(params.tokens[params.cpos++]);
-
- if (params.canwrite) {
- LOG(INFO) << " erasing " << tgt.size << " blocks";
-
- for (size_t i = 0; i < tgt.count; ++i) {
- uint64_t blocks[2];
- // offset in bytes
- blocks[0] = tgt.pos[i * 2] * (uint64_t) BLOCKSIZE;
- // length in bytes
- blocks[1] = (tgt.pos[i * 2 + 1] - tgt.pos[i * 2]) * (uint64_t) BLOCKSIZE;
-
- if (ioctl(params.fd, BLKDISCARD, &blocks) == -1) {
- PLOG(ERROR) << "BLKDISCARD ioctl failed";
- return -1;
- }
- }
- }
-
- return 0;
+ return 0;
}
// Definitions for transfer list command functions
@@ -1645,14 +1631,14 @@
SHA1_Init(&ctx);
std::vector<uint8_t> buffer(BLOCKSIZE);
- for (size_t i = 0; i < rs.count; ++i) {
- if (!check_lseek(fd, (off64_t)rs.pos[i * 2] * BLOCKSIZE, SEEK_SET)) {
+ for (const auto& range : rs) {
+ if (!check_lseek(fd, static_cast<off64_t>(range.first) * BLOCKSIZE, SEEK_SET)) {
ErrorAbort(state, kLseekFailure, "failed to seek %s: %s", blockdev_filename->data.c_str(),
strerror(errno));
return StringValue("");
}
- for (size_t j = rs.pos[i * 2]; j < rs.pos[i * 2 + 1]; ++j) {
+ for (size_t j = range.first; j < range.second; ++j) {
if (read_all(fd, buffer, BLOCKSIZE) == -1) {
ErrorAbort(state, kFreadFailure, "failed to read %s: %s", blockdev_filename->data.c_str(),
strerror(errno));
@@ -1700,7 +1686,7 @@
return StringValue("");
}
- RangeSet blk0{ 1 /*count*/, 1 /*size*/, std::vector<size_t>{ 0, 1 } /*position*/ };
+ RangeSet blk0(std::vector<Range>{ Range{ 0, 1 } });
std::vector<uint8_t> block0_buffer(BLOCKSIZE);
if (ReadBlocks(blk0, block0_buffer, fd) == -1) {
@@ -1770,24 +1756,20 @@
}
fec_status status;
-
if (!fh.get_status(status)) {
ErrorAbort(state, kLibfecFailure, "failed to read FEC status");
return StringValue("");
}
- RangeSet rs = RangeSet::Parse(ranges->data);
-
uint8_t buffer[BLOCKSIZE];
-
- for (size_t i = 0; i < rs.count; ++i) {
- for (size_t j = rs.pos[i * 2]; j < rs.pos[i * 2 + 1]; ++j) {
+ for (const auto& range : RangeSet::Parse(ranges->data)) {
+ for (size_t j = range.first; j < range.second; ++j) {
// Stay within the data area, libfec validates and corrects metadata
- if (status.data_size <= (uint64_t)j * BLOCKSIZE) {
+ if (status.data_size <= static_cast<uint64_t>(j) * BLOCKSIZE) {
continue;
}
- if (fh.pread(buffer, BLOCKSIZE, (off64_t)j * BLOCKSIZE) != BLOCKSIZE) {
+ if (fh.pread(buffer, BLOCKSIZE, static_cast<off64_t>(j) * BLOCKSIZE) != BLOCKSIZE) {
ErrorAbort(state, kLibfecFailure, "failed to recover %s (block %zu): %s",
filename->data.c_str(), j, strerror(errno));
return StringValue("");
diff --git a/updater/include/updater/rangeset.h b/updater/include/updater/rangeset.h
index afaa82d..fad0380 100644
--- a/updater/include/updater/rangeset.h
+++ b/updater/include/updater/rangeset.h
@@ -19,16 +19,35 @@
#include <stddef.h>
#include <string>
+#include <utility>
#include <vector>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>
-struct RangeSet {
- size_t count; // Limit is INT_MAX.
- size_t size; // The number of blocks in the RangeSet.
- std::vector<size_t> pos; // Actual limit is INT_MAX.
+using Range = std::pair<size_t, size_t>;
+
+class RangeSet {
+ public:
+ RangeSet() : blocks_(0) {}
+
+ explicit RangeSet(std::vector<Range>&& pairs) {
+ CHECK_NE(pairs.size(), static_cast<size_t>(0)) << "Invalid number of tokens";
+
+ // Sanity check the input.
+ size_t result = 0;
+ for (const auto& range : pairs) {
+ CHECK_LT(range.first, range.second)
+ << "Empty or negative range: " << range.first << ", " << range.second;
+ size_t sz = range.second - range.first;
+ CHECK_LE(result, SIZE_MAX - sz) << "RangeSet size overflow";
+ result += sz;
+ }
+
+ ranges_ = pairs;
+ blocks_ = result;
+ }
static RangeSet Parse(const std::string& range_text) {
std::vector<std::string> pieces = android::base::Split(range_text, ",");
@@ -42,44 +61,43 @@
CHECK_EQ(num % 2, static_cast<size_t>(0)) << "Number of tokens must be even: " << range_text;
CHECK_EQ(num, pieces.size() - 1) << "Mismatching number of tokens: " << range_text;
- std::vector<size_t> pairs(num);
- size_t size = 0;
+ std::vector<Range> pairs;
for (size_t i = 0; i < num; i += 2) {
- CHECK(android::base::ParseUint(pieces[i + 1], &pairs[i], static_cast<size_t>(INT_MAX)));
- CHECK(android::base::ParseUint(pieces[i + 2], &pairs[i + 1], static_cast<size_t>(INT_MAX)));
- CHECK_LT(pairs[i], pairs[i + 1])
- << "Empty or negative range: " << pairs[i] << ", " << pairs[i + 1];
+ size_t first;
+ CHECK(android::base::ParseUint(pieces[i + 1], &first, static_cast<size_t>(INT_MAX)));
+ size_t second;
+ CHECK(android::base::ParseUint(pieces[i + 2], &second, static_cast<size_t>(INT_MAX)));
- size_t sz = pairs[i + 1] - pairs[i];
- CHECK_LE(size, SIZE_MAX - sz) << "RangeSet size overflow";
- size += sz;
+ pairs.emplace_back(first, second);
}
- return RangeSet{ num / 2, size, std::move(pairs) };
+ return RangeSet(std::move(pairs));
}
// Get the block number for the i-th (starting from 0) block in the RangeSet.
size_t GetBlockNumber(size_t idx) const {
- CHECK_LT(idx, size) << "Index " << idx << " is greater than RangeSet size " << size;
- for (size_t i = 0; i < pos.size(); i += 2) {
- if (idx < pos[i + 1] - pos[i]) {
- return pos[i] + idx;
+ CHECK_LT(idx, blocks_) << "Out of bound index " << idx << " (total blocks: " << blocks_ << ")";
+
+ for (const auto& range : ranges_) {
+ if (idx < range.second - range.first) {
+ return range.first + idx;
}
- idx -= (pos[i + 1] - pos[i]);
+ idx -= (range.second - range.first);
}
- CHECK(false);
+
+ CHECK(false) << "Failed to find block number for index " << idx;
return 0; // Unreachable, but to make compiler happy.
}
// RangeSet has half-closed half-open bounds. For example, "3,5" contains blocks 3 and 4. So "3,5"
// and "5,7" are not overlapped.
bool Overlaps(const RangeSet& other) const {
- for (size_t i = 0; i < count; ++i) {
- size_t start = pos[i * 2];
- size_t end = pos[i * 2 + 1];
- for (size_t j = 0; j < other.count; ++j) {
- size_t other_start = other.pos[j * 2];
- size_t other_end = other.pos[j * 2 + 1];
+ for (const auto& range : ranges_) {
+ size_t start = range.first;
+ size_t end = range.second;
+ for (const auto& other_range : other.ranges_) {
+ size_t other_start = other_range.first;
+ size_t other_end = other_range.second;
// [start, end) vs [other_start, other_end)
if (!(other_start >= end || start >= other_end)) {
return true;
@@ -89,7 +107,58 @@
return false;
}
- bool operator==(const RangeSet& other) const {
- return (count == other.count && size == other.size && pos == other.pos);
+ // size() gives the number of Range's in this RangeSet.
+ size_t size() const {
+ return ranges_.size();
}
+
+ // blocks() gives the number of all blocks in this RangeSet.
+ size_t blocks() const {
+ return blocks_;
+ }
+
+ // We provide const iterators only.
+ std::vector<Range>::const_iterator cbegin() const {
+ return ranges_.cbegin();
+ }
+
+ std::vector<Range>::const_iterator cend() const {
+ return ranges_.cend();
+ }
+
+ // Need to provide begin()/end() since range-based loop expects begin()/end().
+ std::vector<Range>::const_iterator begin() const {
+ return ranges_.cbegin();
+ }
+
+ std::vector<Range>::const_iterator end() const {
+ return ranges_.cend();
+ }
+
+ // Reverse const iterators for MoveRange().
+ std::vector<Range>::const_reverse_iterator crbegin() const {
+ return ranges_.crbegin();
+ }
+
+ std::vector<Range>::const_reverse_iterator crend() const {
+ return ranges_.crend();
+ }
+
+ const Range& operator[](size_t i) const {
+ return ranges_[i];
+ }
+
+ bool operator==(const RangeSet& other) const {
+ // The orders of Range's matter. "4,1,5,8,10" != "4,8,10,1,5".
+ return (ranges_ == other.ranges_);
+ }
+
+ bool operator!=(const RangeSet& other) const {
+ return ranges_ != other.ranges_;
+ }
+
+ private:
+ // Actual limit for each value and the total number are both INT_MAX.
+ std::vector<Range> ranges_;
+ size_t blocks_;
};
