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fix: infinite loop due to hidden row in XLSX.stream.to_json (#3178)

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**Title:**

Fix for Incorrect Row Indexing and Infinite Loop in stream.to_json Function

**Description:**

This pull request addresses two key issues in the `stream.to_json` function of the SheetJS library:

1. **Infinite Loop**: Previously, when a row was hidden, the function skipped processing the current row without incrementing the row counter `R`, resulting in an infinite loop during execution.

2. **Incorrect Row Indexing**: The row index was incorrectly accessed using a one-based index, whereas the actual row index was zero-based. This led to unintended hidden rows being included in the stream and skipping of subsequent non-hidden rows.

**Changes:**

- Modified the hidden row check to use the correct zero-based indexing
- Incremented `R` after identifying a hidden row to ensure the loop progresses to the next row.
- Ensured that the stream correctly processes all rows, skipping hidden rows without affecting subsequent rows.

**Testing:**

- Validated that the `stream.to_json` function no longer enters an infinite loop when encountering hidden rows.
- Confirmed that the correct rows are processed and pushed to the stream, with hidden rows being appropriately skipped.

**Impact:**

This fix enhances the reliability of the SheetJS library, ensuring accurate data streaming from spreadsheets without infinite loops or incorrect row handling.

**Checklist:**

- [x] Code changes have been tested locally.
- [x] The changes adhere to the project's coding standards and guidelines.

**Additional Information:**

These changes are crucial for maintaining the library's functionality in production environments, where precise data handling is essential.

**References:**

Closes #3176.

---

Reviewed-on: sheetjs/sheetjs#3178
Co-authored-by: deepak-negi-web <deepak-negi-web@noreply.git.sheetjs.com>
Co-committed-by: deepak-negi-web <deepak-negi-web@noreply.git.sheetjs.com>
This commit is contained in:
deepak-negi-web 2024-08-21 05:34:31 +00:00 committed by sheetjs
parent 9368a85b5f
commit 5550b90704
1 changed files with 4 additions and 1 deletions
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5
bits/97_node.js
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@ -103,7 +103,10 @@ function write_json_stream(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/) {
R = r.s.r + offset;
stream._read = function() {
while(R <= r.e.r) {
if ((rowinfo[R-1]||{}).hidden) continue;
if ((rowinfo[R]||{}).hidden) {
++R;
continue;
};
var row = make_json_row(sheet, r, R, cols, header, hdr, o);
++R;
if((row.isempty === false) || (header === 1 ? o.blankrows !== false : !!o.blankrows)) {