diff options
Diffstat (limited to 'source/unzip/mztools.c')
| -rw-r--r-- | source/unzip/mztools.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/source/unzip/mztools.c b/source/unzip/mztools.c new file mode 100644 index 0000000..bc5c798 --- /dev/null +++ b/source/unzip/mztools.c @@ -0,0 +1,281 @@ +/*
+ Additional tools for Minizip
+ Code: Xavier Roche '2004
+ License: Same as ZLIB (www.gzip.org)
+*/
+
+/* Code */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "zlib.h"
+#include "unzip.h"
+
+#define READ_8(adr) ((unsigned char)*(adr))
+#define READ_16(adr) ( READ_8(adr) | (READ_8(adr+1) << 8) )
+#define READ_32(adr) ( READ_16(adr) | (READ_16((adr)+2) << 16) )
+
+#define WRITE_8(buff, n) do { \
+ *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \
+} while(0)
+#define WRITE_16(buff, n) do { \
+ WRITE_8((unsigned char*)(buff), n); \
+ WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \
+} while(0)
+#define WRITE_32(buff, n) do { \
+ WRITE_16((unsigned char*)(buff), (n) & 0xffff); \
+ WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \
+} while(0)
+
+extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)
+const char* file;
+const char* fileOut;
+const char* fileOutTmp;
+uLong* nRecovered;
+uLong* bytesRecovered;
+{
+ int err = Z_OK;
+ FILE* fpZip = fopen(file, "rb");
+ FILE* fpOut = fopen(fileOut, "wb");
+ FILE* fpOutCD = fopen(fileOutTmp, "wb");
+ if (fpZip != NULL && fpOut != NULL) {
+ int entries = 0;
+ uLong totalBytes = 0;
+ char header[30];
+ char filename[256];
+ char extra[1024];
+ int offset = 0;
+ int offsetCD = 0;
+ while ( fread(header, 1, 30, fpZip) == 30 ) {
+ int currentOffset = offset;
+
+ /* File entry */
+ if (READ_32(header) == 0x04034b50) {
+ unsigned int version = READ_16(header + 4);
+ unsigned int gpflag = READ_16(header + 6);
+ unsigned int method = READ_16(header + 8);
+ unsigned int filetime = READ_16(header + 10);
+ unsigned int filedate = READ_16(header + 12);
+ unsigned int crc = READ_32(header + 14); /* crc */
+ unsigned int cpsize = READ_32(header + 18); /* compressed size */
+ unsigned int uncpsize = READ_32(header + 22); /* uncompressed sz */
+ unsigned int fnsize = READ_16(header + 26); /* file name length */
+ unsigned int extsize = READ_16(header + 28); /* extra field length */
+ filename[0] = extra[0] = '\0';
+
+ /* Header */
+ if (fwrite(header, 1, 30, fpOut) == 30) {
+ offset += 30;
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+
+ /* Filename */
+ if (fnsize > 0) {
+ if (fread(filename, 1, fnsize, fpZip) == fnsize) {
+ if (fwrite(filename, 1, fnsize, fpOut) == fnsize) {
+ offset += fnsize;
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+ } else {
+ err = Z_STREAM_ERROR;
+ break;
+ }
+
+ /* Extra field */
+ if (extsize > 0) {
+ if (fread(extra, 1, extsize, fpZip) == extsize) {
+ if (fwrite(extra, 1, extsize, fpOut) == extsize) {
+ offset += extsize;
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+ }
+
+ /* Data */
+ {
+ int dataSize = cpsize;
+ if (dataSize == 0) {
+ dataSize = uncpsize;
+ }
+ if (dataSize > 0) {
+ char* data = malloc(dataSize);
+ if (data != NULL) {
+ if ((int)fread(data, 1, dataSize, fpZip) == dataSize) {
+ if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) {
+ offset += dataSize;
+ totalBytes += dataSize;
+ } else {
+ err = Z_ERRNO;
+ }
+ } else {
+ err = Z_ERRNO;
+ }
+ free(data);
+ if (err != Z_OK) {
+ break;
+ }
+ } else {
+ err = Z_MEM_ERROR;
+ break;
+ }
+ }
+ }
+
+ /* Central directory entry */
+ {
+ char header[46];
+ char* comment = "";
+ int comsize = (int) strlen(comment);
+ WRITE_32(header, 0x02014b50);
+ WRITE_16(header + 4, version);
+ WRITE_16(header + 6, version);
+ WRITE_16(header + 8, gpflag);
+ WRITE_16(header + 10, method);
+ WRITE_16(header + 12, filetime);
+ WRITE_16(header + 14, filedate);
+ WRITE_32(header + 16, crc);
+ WRITE_32(header + 20, cpsize);
+ WRITE_32(header + 24, uncpsize);
+ WRITE_16(header + 28, fnsize);
+ WRITE_16(header + 30, extsize);
+ WRITE_16(header + 32, comsize);
+ WRITE_16(header + 34, 0); /* disk # */
+ WRITE_16(header + 36, 0); /* int attrb */
+ WRITE_32(header + 38, 0); /* ext attrb */
+ WRITE_32(header + 42, currentOffset);
+ /* Header */
+ if (fwrite(header, 1, 46, fpOutCD) == 46) {
+ offsetCD += 46;
+
+ /* Filename */
+ if (fnsize > 0) {
+ if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) {
+ offsetCD += fnsize;
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+ } else {
+ err = Z_STREAM_ERROR;
+ break;
+ }
+
+ /* Extra field */
+ if (extsize > 0) {
+ if (fwrite(extra, 1, extsize, fpOutCD) == extsize) {
+ offsetCD += extsize;
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+ }
+
+ /* Comment field */
+ if (comsize > 0) {
+ if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) {
+ offsetCD += comsize;
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+ }
+
+
+ } else {
+ err = Z_ERRNO;
+ break;
+ }
+ }
+
+ /* Success */
+ entries++;
+
+ } else {
+ break;
+ }
+ }
+
+ /* Final central directory */
+ {
+ int entriesZip = entries;
+ char header[22];
+ char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools";
+ int comsize = (int) strlen(comment);
+ if (entriesZip > 0xffff) {
+ entriesZip = 0xffff;
+ }
+ WRITE_32(header, 0x06054b50);
+ WRITE_16(header + 4, 0); /* disk # */
+ WRITE_16(header + 6, 0); /* disk # */
+ WRITE_16(header + 8, entriesZip); /* hack */
+ WRITE_16(header + 10, entriesZip); /* hack */
+ WRITE_32(header + 12, offsetCD); /* size of CD */
+ WRITE_32(header + 16, offset); /* offset to CD */
+ WRITE_16(header + 20, comsize); /* comment */
+
+ /* Header */
+ if (fwrite(header, 1, 22, fpOutCD) == 22) {
+
+ /* Comment field */
+ if (comsize > 0) {
+ if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) {
+ err = Z_ERRNO;
+ }
+ }
+
+ } else {
+ err = Z_ERRNO;
+ }
+ }
+
+ /* Final merge (file + central directory) */
+ fclose(fpOutCD);
+ if (err == Z_OK) {
+ fpOutCD = fopen(fileOutTmp, "rb");
+ if (fpOutCD != NULL) {
+ int nRead;
+ char buffer[8192];
+ while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
+ if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) {
+ err = Z_ERRNO;
+ break;
+ }
+ }
+ fclose(fpOutCD);
+ }
+ }
+
+ /* Close */
+ fclose(fpZip);
+ fclose(fpOut);
+
+ /* Wipe temporary file */
+ (void)remove(fileOutTmp);
+
+ /* Number of recovered entries */
+ if (err == Z_OK) {
+ if (nRecovered != NULL) {
+ *nRecovered = entries;
+ }
+ if (bytesRecovered != NULL) {
+ *bytesRecovered = totalBytes;
+ }
+ }
+ } else {
+ err = Z_STREAM_ERROR;
+ }
+ return err;
+}
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