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depot/third_party/nixpkgs/pkgs/applications/audio/audacity/0001-Use-a-different-approach-to-estimate-the-disk-space-.patch
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GitOrigin-RevId: 395879c28386e1abf20c7ecacd45880759548391
2021-12-18 20:06:50 -05:00

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From deeb435829d73524df851f6f4c2d4be552c99230 Mon Sep 17 00:00:00 2001
From: Dmitry Vedenko <dmitry@crsib.me>
Date: Fri, 1 Oct 2021 16:21:22 +0300
Subject: [PATCH] Use a different approach to estimate the disk space usage
New a approach is a bit less precise, but removes the requirement for the "private" SQLite3 table and allows Audacity to be built against system SQLite3.
---
cmake-proxies/sqlite/CMakeLists.txt | 5 -
src/DBConnection.h | 4 +-
src/ProjectFileIO.cpp | 269 +++++-----------------------
3 files changed, 44 insertions(+), 234 deletions(-)
diff --git a/cmake-proxies/sqlite/CMakeLists.txt b/cmake-proxies/sqlite/CMakeLists.txt
index 63d70637c..d7b9b95ef 100644
--- a/cmake-proxies/sqlite/CMakeLists.txt
+++ b/cmake-proxies/sqlite/CMakeLists.txt
@@ -19,11 +19,6 @@ list( APPEND INCLUDES
list( APPEND DEFINES
PRIVATE
- #
- # We need the dbpage table for space calculations.
- #
- SQLITE_ENABLE_DBPAGE_VTAB=1
-
# Can't be set after a WAL mode database is initialized, so change
# the default here to ensure all project files get the same page
# size.
diff --git a/src/DBConnection.h b/src/DBConnection.h
index 16a7fc9d4..07d3af95e 100644
--- a/src/DBConnection.h
+++ b/src/DBConnection.h
@@ -75,8 +75,8 @@ public:
LoadSampleBlock,
InsertSampleBlock,
DeleteSampleBlock,
- GetRootPage,
- GetDBPage
+ GetSampleBlockSize,
+ GetAllSampleBlocksSize
};
sqlite3_stmt *Prepare(enum StatementID id, const char *sql);
diff --git a/src/ProjectFileIO.cpp b/src/ProjectFileIO.cpp
index 3b3e2e1fd..c9bc45af4 100644
--- a/src/ProjectFileIO.cpp
+++ b/src/ProjectFileIO.cpp
@@ -35,6 +35,7 @@ Paul Licameli split from AudacityProject.cpp
#include "widgets/ProgressDialog.h"
#include "wxFileNameWrapper.h"
#include "xml/XMLFileReader.h"
+#include "MemoryX.h"`
#undef NO_SHM
#if !defined(__WXMSW__)
@@ -2357,255 +2358,69 @@ int64_t ProjectFileIO::GetTotalUsage()
}
//
-// Returns the amount of disk space used by the specified sample blockid or all
-// of the sample blocks if the blockid is 0. It does this by using the raw SQLite
-// pages available from the "sqlite_dbpage" virtual table to traverse the SQLite
-// table b-tree described here: https://www.sqlite.org/fileformat.html
+// Returns the estimation of disk space used by the specified sample blockid or all
+// of the sample blocks if the blockid is 0. This does not include small overhead
+// of the internal SQLite structures, only the size used by the data
//
int64_t ProjectFileIO::GetDiskUsage(DBConnection &conn, SampleBlockID blockid /* = 0 */)
{
- // Information we need to track our travels through the b-tree
- typedef struct
- {
- int64_t pgno;
- int currentCell;
- int numCells;
- unsigned char data[65536];
- } page;
- std::vector<page> stack;
-
- int64_t total = 0;
- int64_t found = 0;
- int64_t right = 0;
- int rc;
+ sqlite3_stmt* stmt = nullptr;
- // Get the rootpage for the sampleblocks table.
- sqlite3_stmt *stmt =
- conn.Prepare(DBConnection::GetRootPage,
- "SELECT rootpage FROM sqlite_master WHERE tbl_name = 'sampleblocks';");
- if (stmt == nullptr || sqlite3_step(stmt) != SQLITE_ROW)
+ if (blockid == 0)
{
- return 0;
- }
-
- // And store it in our first stack frame
- stack.push_back({sqlite3_column_int64(stmt, 0)});
+ static const char* statement =
+R"(SELECT
+ sum(length(blockid) + length(sampleformat) +
+ length(summin) + length(summax) + length(sumrms) +
+ length(summary256) + length(summary64k) +
+ length(samples))
+FROM sampleblocks;)";
- // All done with the statement
- sqlite3_clear_bindings(stmt);
- sqlite3_reset(stmt);
-
- // Prepare/retrieve statement to read raw database page
- stmt = conn.Prepare(DBConnection::GetDBPage,
- "SELECT data FROM sqlite_dbpage WHERE pgno = ?1;");
- if (stmt == nullptr)
- {
- return 0;
+ stmt = conn.Prepare(DBConnection::GetAllSampleBlocksSize, statement);
}
-
- // Traverse the b-tree until we've visited all of the leaf pages or until
- // we find the one corresponding to the passed in sample blockid. Because we
- // use an integer primary key for the sampleblocks table, the traversal will
- // be in ascending blockid sequence.
- do
+ else
{
- // Acces the top stack frame
- page &pg = stack.back();
+ static const char* statement =
+R"(SELECT
+ length(blockid) + length(sampleformat) +
+ length(summin) + length(summax) + length(sumrms) +
+ length(summary256) + length(summary64k) +
+ length(samples)
+FROM sampleblocks WHERE blockid = ?1;)";
- // Read the page from the sqlite_dbpage table if it hasn't yet been loaded
- if (pg.numCells == 0)
- {
- // Bind the page number
- sqlite3_bind_int64(stmt, 1, pg.pgno);
+ stmt = conn.Prepare(DBConnection::GetSampleBlockSize, statement);
+ }
- // And retrieve the page
- if (sqlite3_step(stmt) != SQLITE_ROW)
+ auto cleanup = finally(
+ [stmt]() {
+ // Clear statement bindings and rewind statement
+ if (stmt != nullptr)
{
- // REVIEW: Likely harmless failure - says size is zero on
- // this error.
- // LLL: Yea, but not much else we can do.
- return 0;
+ sqlite3_clear_bindings(stmt);
+ sqlite3_reset(stmt);
}
+ });
- // Copy the page content to the stack frame
- memcpy(&pg.data,
- sqlite3_column_blob(stmt, 0),
- sqlite3_column_bytes(stmt, 0));
-
- // And retrieve the total number of cells within it
- pg.numCells = get2(&pg.data[3]);
-
- // Reset statement for next usage
- sqlite3_clear_bindings(stmt);
- sqlite3_reset(stmt);
- }
-
- //wxLogDebug("%*.*spgno %lld currentCell %d numCells %d", (stack.size() - 1) * 2, (stack.size() - 1) * 2, "", pg.pgno, pg.currentCell, pg.numCells);
-
- // Process an interior table b-tree page
- if (pg.data[0] == 0x05)
- {
- // Process the next cell if we haven't examined all of them yet
- if (pg.currentCell < pg.numCells)
- {
- // Remember the right-most leaf page number.
- right = get4(&pg.data[8]);
-
- // Iterate over the cells.
- //
- // If we're not looking for a specific blockid, then we always push the
- // target page onto the stack and leave the loop after a single iteration.
- //
- // Otherwise, we match the blockid against the highest integer key contained
- // within the cell and if the blockid falls within the cell, we stack the
- // page and stop the iteration.
- //
- // In theory, we could do a binary search for a specific blockid here, but
- // because our sample blocks are always large, we will get very few cells
- // per page...usually 6 or less.
- //
- // In both cases, the stacked page can be either an internal or leaf page.
- bool stacked = false;
- while (pg.currentCell < pg.numCells)
- {
- // Get the offset to this cell using the offset in the cell pointer
- // array.
- //
- // The cell pointer array starts immediately after the page header
- // at offset 12 and the retrieved offset is from the beginning of
- // the page.
- int celloff = get2(&pg.data[12 + (pg.currentCell * 2)]);
-
- // Bump to the next cell for the next iteration.
- pg.currentCell++;
-
- // Get the page number this cell describes
- int pagenum = get4(&pg.data[celloff]);
-
- // And the highest integer key, which starts at offset 4 within the cell.
- int64_t intkey = 0;
- get_varint(&pg.data[celloff + 4], &intkey);
-
- //wxLogDebug("%*.*sinternal - right %lld celloff %d pagenum %d intkey %lld", (stack.size() - 1) * 2, (stack.size() - 1) * 2, " ", right, celloff, pagenum, intkey);
-
- // Stack the described page if we're not looking for a specific blockid
- // or if this page contains the given blockid.
- if (!blockid || blockid <= intkey)
- {
- stack.push_back({pagenum, 0, 0});
- stacked = true;
- break;
- }
- }
-
- // If we pushed a new page onto the stack, we need to jump back up
- // to read the page
- if (stacked)
- {
- continue;
- }
- }
+ if (blockid != 0)
+ {
+ int rc = sqlite3_bind_int64(stmt, 1, blockid);
- // We've exhausted all the cells with this page, so we stack the right-most
- // leaf page. Ensure we only process it once.
- if (right)
- {
- stack.push_back({right, 0, 0});
- right = 0;
- continue;
- }
- }
- // Process a leaf table b-tree page
- else if (pg.data[0] == 0x0d)
+ if (rc != SQLITE_OK)
{
- // Iterate over the cells
- //
- // If we're not looking for a specific blockid, then just accumulate the
- // payload sizes. We will be reading every leaf page in the sampleblocks
- // table.
- //
- // Otherwise we break out when we find the matching blockid. In this case,
- // we only ever look at 1 leaf page.
- bool stop = false;
- for (int i = 0; i < pg.numCells; i++)
- {
- // Get the offset to this cell using the offset in the cell pointer
- // array.
- //
- // The cell pointer array starts immediately after the page header
- // at offset 8 and the retrieved offset is from the beginning of
- // the page.
- int celloff = get2(&pg.data[8 + (i * 2)]);
-
- // Get the total payload size in bytes of the described row.
- int64_t payload = 0;
- int digits = get_varint(&pg.data[celloff], &payload);
-
- // Get the integer key for this row.
- int64_t intkey = 0;
- get_varint(&pg.data[celloff + digits], &intkey);
-
- //wxLogDebug("%*.*sleaf - celloff %4d intkey %lld payload %lld", (stack.size() - 1) * 2, (stack.size() - 1) * 2, " ", celloff, intkey, payload);
-
- // Add this payload size to the total if we're not looking for a specific
- // blockid
- if (!blockid)
- {
- total += payload;
- }
- // Otherwise, return the payload size for a matching row
- else if (blockid == intkey)
- {
- return payload;
- }
- }
+ conn.ThrowException(false);
}
+ }
- // Done with the current branch, so pop back up to the previous one (if any)
- stack.pop_back();
- } while (!stack.empty());
-
- // Return the total used for all sample blocks
- return total;
-}
-
-// Retrieves a 2-byte big-endian integer from the page data
-unsigned int ProjectFileIO::get2(const unsigned char *ptr)
-{
- return (ptr[0] << 8) | ptr[1];
-}
-
-// Retrieves a 4-byte big-endian integer from the page data
-unsigned int ProjectFileIO::get4(const unsigned char *ptr)
-{
- return ((unsigned int) ptr[0] << 24) |
- ((unsigned int) ptr[1] << 16) |
- ((unsigned int) ptr[2] << 8) |
- ((unsigned int) ptr[3]);
-}
-
-// Retrieves a variable length integer from the page data. Returns the
-// number of digits used to encode the integer and the stores the
-// value at the given location.
-int ProjectFileIO::get_varint(const unsigned char *ptr, int64_t *out)
-{
- int64_t val = 0;
- int i;
+ int rc = sqlite3_step(stmt);
- for (i = 0; i < 8; ++i)
+ if (rc != SQLITE_ROW)
{
- val = (val << 7) + (ptr[i] & 0x7f);
- if ((ptr[i] & 0x80) == 0)
- {
- *out = val;
- return i + 1;
- }
+ conn.ThrowException(false);
}
- val = (val << 8) + (ptr[i] & 0xff);
- *out = val;
+ const int64_t size = sqlite3_column_int64(stmt, 0);
- return 9;
+ return size;
}
InvisibleTemporaryProject::InvisibleTemporaryProject()
--
2.33.1
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