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Parse sce_lbn more leniently, like the PSP does.

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Unknown W. Brackets 2013-06-23 16:15:23 -07:00
parent d467eac6a6
commit 010bd689f6
1 changed files with 18 additions and 15 deletions
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33
Core/FileSystems/ISOFileSystem.cpp
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@ -28,29 +28,32 @@ const int sectorSize = 2048;
static bool parseLBN(std::string filename, u32 *sectorStart, u32 *readSize)
{
// Looks like: /sce_lbn0x10_size0x100 or /sce_lbn10_size100 (always hex.)
// The format of this is: "/sce_lbn" "0x"? HEX* ANY* "_size" "0x"? HEX* ANY*
// That means that "/sce_lbn/_size1/" is perfectly valid.
// Most commonly, it looks like /sce_lbn0x10_size0x100 or /sce_lbn10_size100 (always hex.)
// If it doesn't starts with /sce_lbn or doesn't have _size, look for a file instead.
if (filename.compare(0, sizeof("/sce_lbn") - 1, "/sce_lbn") != 0)
return false;
size_t size_pos = filename.find("_size");
if (size_pos == filename.npos)
return false;
// TODO: Return SCE_KERNEL_ERROR_ERRNO_INVALID_ARGUMENT when >= 32 long but passes above checks.
if (filename.size() >= 32)
return false;
size_t pos = sizeof("/sce_lbn") - 1;
const char *filename_c = filename.c_str();
size_t pos = strlen("/sce_lbn");
int offset = 0;
if (sscanf(filename_c + pos, "%x%n", sectorStart, &offset) != 1)
WARN_LOG_REPORT(FILESYS, "Invalid LBN reference: %s", filename_c);
pos += offset;
if (sscanf(filename_c + pos, "%x", sectorStart) != 1)
*sectorStart = 0;
if (filename.compare(pos, sizeof("_size") - 1, "_size") != 0)
WARN_LOG_REPORT(FILESYS, "Invalid LBN reference: %s", filename_c);
pos += sizeof("_size") - 1;
pos = size_pos + strlen("_size");
offset = 0;
if (sscanf(filename_c + pos, "%x%n", readSize, &offset) != 1)
WARN_LOG_REPORT(FILESYS, "Invalid LBN reference: %s", filename_c);
pos += offset;
if (sscanf(filename_c + pos, "%x", readSize) != 1)
*readSize = 0;
if (filename.size() > pos)
WARN_LOG_REPORT(FILESYS, "Incomplete LBN reference: %s", filename_c);
return true;
}