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Fr4nz D13trich 2025-11-22 13:58:55 +01:00
parent 4af19165ec
commit 68073add76
12458 changed files with 12350765 additions and 2 deletions
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75
3party/bsdiff-courgette/bsdiff/bsdiff_common.h Normal file
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#ifndef COURGETTE_THIRD_PARTY_BSDIFF_BSDIFF_HEADER_H_
#define COURGETTE_THIRD_PARTY_BSDIFF_BSDIFF_HEADER_H_
#include "coding/reader.hpp"
#include "coding/varint.hpp"
#include <string>
namespace bsdiff {
// The following declarations are common to the patch-creation and
// patch-application code.
int constexpr kNumStreams = 6;
enum BSDiffStatus {
OK = 0,
MEM_ERROR = 1,
CRC_ERROR = 2,
READ_ERROR = 3,
UNEXPECTED_ERROR = 4,
WRITE_ERROR = 5,
CANCELLED = 6,
};
// The patch stream starts with a MBSPatchHeader.
typedef struct MBSPatchHeader_ {
char tag[8]; // Contains MBS_PATCH_HEADER_TAG.
uint32_t slen; // Length of the file to be patched.
uint32_t scrc32; // CRC32 of the file to be patched.
uint32_t dlen; // Length of the result file.
} MBSPatchHeader;
// This is the value for the tag field. Must match length exactly, not counting
// null at end of string.
#define MBS_PATCH_HEADER_TAG "GBSDIF42"
template <typename Sink>
void WriteHeader(Sink & sink, MBSPatchHeader* header) {
sink.Write(header->tag, sizeof(header->tag));
WriteVarUint(sink, header->slen);
WriteVarUint(sink, header->scrc32);
WriteVarUint(sink, header->dlen);
}
template <typename Source>
BSDiffStatus MBS_ReadHeader(Source & src, MBSPatchHeader* header) {
src.Read(header->tag, sizeof(header->tag));
header->slen = ReadVarUint<uint32_t>(src);
header->scrc32 = ReadVarUint<uint32_t>(src);
header->dlen = ReadVarUint<uint32_t>(src);
// The string will have a NUL terminator that we don't use, hence '-1'.
static_assert(sizeof(MBS_PATCH_HEADER_TAG) - 1 == sizeof(header->tag),
"MBS_PATCH_HEADER_TAG must match header field size");
if (memcmp(header->tag, MBS_PATCH_HEADER_TAG, 8) != 0)
return UNEXPECTED_ERROR;
return OK;
}
inline std::string DebugPrint(BSDiffStatus status) {
switch (status) {
case OK: return "OK";
case MEM_ERROR: return "MEM_ERROR";
case CRC_ERROR: return "CRC_ERROR";
case READ_ERROR: return "READ_ERROR";
case UNEXPECTED_ERROR: return "UNEXPECTED_ERROR";
case WRITE_ERROR: return "WRITE_ERROR";
case CANCELLED: return "CANCELLED";
}
return "Unknown status";
}
} // namespace bsdiff
#endif // COURGETTE_THIRD_PARTY_BSDIFF_BSDIFF_HEADER_H_