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pfs: change name table padding handling

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Updates pfsAddEntryInformationToImageContext() to handle name table padding and alignment on its own. As a result, the logic from pfsWriteImageContextHeaderToMemoryBuffer() has been heavily simplified.
This commit is contained in:
Pablo Curiel 2024-08-26 10:06:17 +02:00
parent 9d792279d3
commit 4b57609860
2 changed files with 49 additions and 36 deletions
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2
include/core/pfs.h
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@ -97,6 +97,8 @@ bool pfsGenerateEntryPatch(PartitionFileSystemContext *ctx, PartitionFileSystemE
bool pfsAddEntryInformationToImageContext(PartitionFileSystemImageContext *ctx, const char *entry_name, u64 entry_size, u32 *out_entry_idx);
/// Updates the name from a Partition FS entry in an existing PartitionFileSystemImageContext, using an entry index and the new entry name.
/// The new name length must not exceed the previous name length.
/// Furthermore, if the new name is shorter than the previous name, the rest of the previous name will be preserved.
bool pfsUpdateEntryNameFromImageContext(PartitionFileSystemImageContext *ctx, u32 entry_idx, const char *new_entry_name);
/// Generates a full Partition FS header from an existing PartitionFileSystemImageContext and writes it to the provided memory buffer.

83
source/core/pfs.c
View file

@ -246,24 +246,22 @@ bool pfsGenerateEntryPatch(PartitionFileSystemContext *ctx, PartitionFileSystemE
bool pfsAddEntryInformationToImageContext(PartitionFileSystemImageContext *ctx, const char *entry_name, u64 entry_size, u32 *out_entry_idx)
{
if (!ctx || !entry_name || !*entry_name)
size_t entry_name_len = 0;
if (!ctx || !entry_name || !(entry_name_len = strlen(entry_name)))
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
PartitionFileSystemHeader *header = &(ctx->header);
PartitionFileSystemEntry *tmp_pfs_entries = NULL, *cur_pfs_entry = NULL, *prev_pfs_entry = NULL;
u64 tmp_pfs_entries_size = ((header->entry_count + 1) * sizeof(PartitionFileSystemEntry));
char *tmp_name_table = NULL;
u32 tmp_name_table_size = (header->name_table_size + strlen(entry_name) + 1);
u32 unpadded_name_table_size = 0;
/* Reallocate Partition FS entries. */
if (!(tmp_pfs_entries = realloc(ctx->entries, tmp_pfs_entries_size)))
if (!(tmp_pfs_entries = realloc(ctx->entries, (header->entry_count + 1) * sizeof(PartitionFileSystemEntry))))
{
LOG_MSG_ERROR("Failed to reallocate Partition FS entries!");
LOG_MSG_ERROR("Failed to reallocate Partition FS entries! (%u).", header->entry_count + 1);
return false;
}
@ -278,26 +276,46 @@ bool pfsAddEntryInformationToImageContext(PartitionFileSystemImageContext *ctx,
cur_pfs_entry->offset = (prev_pfs_entry ? (prev_pfs_entry->offset + prev_pfs_entry->size) : 0);
cur_pfs_entry->size = entry_size;
cur_pfs_entry->name_offset = header->name_table_size;
cur_pfs_entry->name_offset = (prev_pfs_entry ? (prev_pfs_entry->name_offset + strlen(ctx->name_table + prev_pfs_entry->name_offset) + 1) : 0);
/* Reallocate Partition FS name table. */
if (!(tmp_name_table = realloc(ctx->name_table, tmp_name_table_size)))
/* Calculate unpadded name table size. Reserve space for a NULL terminator. */
unpadded_name_table_size = (cur_pfs_entry->name_offset + (u32)entry_name_len + 1);
/* Check if the name for this new entry exceeds our current name table size. */
if (unpadded_name_table_size >= header->name_table_size)
{
LOG_MSG_ERROR("Failed to reallocate Partition FS name table!");
return false;
/* Calculate padded name table size. */
char *tmp_name_table = NULL;
u32 nameless_header_size = (u32)(sizeof(PartitionFileSystemHeader) + ((header->entry_count + 1) * sizeof(PartitionFileSystemEntry)));
u32 padded_name_table_size = (ALIGN_UP(nameless_header_size + unpadded_name_table_size, PFS_HEADER_PADDING_ALIGNMENT) - nameless_header_size);
/* Add manual padding if the full Partition FS header would already be properly aligned. */
if (padded_name_table_size == unpadded_name_table_size) padded_name_table_size += PFS_HEADER_PADDING_ALIGNMENT;
/* Reallocate Partition FS name table. */
if (!(tmp_name_table = realloc(ctx->name_table, padded_name_table_size)))
{
LOG_MSG_ERROR("Failed to reallocate Partition FS name table! (0x%X).", padded_name_table_size);
return false;
}
ctx->name_table = tmp_name_table;
tmp_name_table = NULL;
/* Clear new allocated area. */
memset(ctx->name_table + cur_pfs_entry->name_offset, 0, padded_name_table_size - cur_pfs_entry->name_offset);
/* Update Partition FS name table size. */
header->name_table_size = padded_name_table_size;
}
ctx->name_table = tmp_name_table;
tmp_name_table = NULL;
/* Update Partition FS name table. */
sprintf(ctx->name_table + header->name_table_size, "%s", entry_name);
header->name_table_size = tmp_name_table_size;
/* Append new entry name to the Partition FS name table. */
memcpy(ctx->name_table + cur_pfs_entry->name_offset, entry_name, entry_name_len);
/* Update output entry index. */
if (out_entry_idx) *out_entry_idx = header->entry_count;
/* Update Partition FS entry count, name table size and data size. */
/* Update Partition FS entry count and data size. */
header->entry_count++;
ctx->fs_size += entry_size;
@ -306,7 +324,10 @@ bool pfsAddEntryInformationToImageContext(PartitionFileSystemImageContext *ctx,
bool pfsUpdateEntryNameFromImageContext(PartitionFileSystemImageContext *ctx, u32 entry_idx, const char *new_entry_name)
{
if (!ctx || !ctx->header.entry_count || !ctx->header.name_table_size || !ctx->entries || !ctx->name_table || entry_idx >= ctx->header.entry_count || !new_entry_name || !*new_entry_name)
size_t new_entry_name_len = 0;
if (!ctx || !ctx->header.entry_count || !ctx->header.name_table_size || !ctx->entries || !ctx->name_table || entry_idx >= ctx->header.entry_count || \
!new_entry_name || !(new_entry_name_len = strlen(new_entry_name)))
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
@ -315,7 +336,6 @@ bool pfsUpdateEntryNameFromImageContext(PartitionFileSystemImageContext *ctx, u3
PartitionFileSystemEntry *pfs_entry = &(ctx->entries[entry_idx]);
char *name_table_entry = (ctx->name_table + pfs_entry->name_offset);
size_t new_entry_name_len = strlen(new_entry_name);
size_t cur_entry_name_len = strlen(name_table_entry);
if (new_entry_name_len > cur_entry_name_len)
@ -324,6 +344,7 @@ bool pfsUpdateEntryNameFromImageContext(PartitionFileSystemImageContext *ctx, u3
return false;
}
//if (new_entry_name_len < cur_entry_name_len) memset(name_table_entry + new_entry_name_len, 0, cur_entry_name_len - new_entry_name_len);
memcpy(name_table_entry, new_entry_name, new_entry_name_len);
return true;
@ -339,29 +360,22 @@ bool pfsWriteImageContextHeaderToMemoryBuffer(PartitionFileSystemImageContext *c
PartitionFileSystemHeader *header = &(ctx->header);
u8 *buf_u8 = (u8*)buf;
u64 header_size = 0, padded_header_size = 0, block_offset = 0, block_size = 0;
u32 padding_size = 0;
u64 header_size = 0, block_offset = 0, block_size = 0;
/* Calculate header size. */
header_size = (sizeof(PartitionFileSystemHeader) + (header->entry_count * sizeof(PartitionFileSystemEntry)) + header->name_table_size);
/* Calculate padded header size and padding size. */
padded_header_size = (IS_ALIGNED(header_size, PFS_HEADER_PADDING_ALIGNMENT) ? (header_size + PFS_HEADER_PADDING_ALIGNMENT) : ALIGN_UP(header_size, PFS_HEADER_PADDING_ALIGNMENT));
padding_size = (u32)(padded_header_size - header_size);
/* Check buffer size. */
if (buf_size < padded_header_size)
if (buf_size < header_size)
{
LOG_MSG_ERROR("Not enough space available in input buffer to write full Partition FS header! (got 0x%lX, need 0x%lX).", buf_size, padded_header_size);
LOG_MSG_ERROR("Not enough space available in input buffer to write full Partition FS header! (got 0x%lX, need 0x%lX).", buf_size, header_size);
return false;
}
/* Write full header. */
header->name_table_size += padding_size;
block_size = sizeof(PartitionFileSystemHeader);
memcpy(buf_u8 + block_offset, header, block_size);
block_offset += block_size;
header->name_table_size -= padding_size;
block_size = (header->entry_count * sizeof(PartitionFileSystemEntry));
memcpy(buf_u8 + block_offset, ctx->entries, block_size);
@ -369,12 +383,9 @@ bool pfsWriteImageContextHeaderToMemoryBuffer(PartitionFileSystemImageContext *c
block_size = header->name_table_size;
memcpy(buf_u8 + block_offset, ctx->name_table, block_size);
block_offset += block_size;
memset(buf_u8 + block_offset, 0, padding_size);
/* Update output header size. */
*out_header_size = padded_header_size;
*out_header_size = header_size;
return true;
}