junzip.h

/**
 * JUnzip library by Joonas Pihlajamaa (firstname.lastname@iki.fi).
 * Released into public domain. https://github.com/jokkebk/JUnzip
 */

#ifndef __JUNZIP_H
#define __JUNZIP_H

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include <stdint.h>

// Enable compiling without Zlib as well
// (no compression support, only "store")
#ifdef HAVE_ZLIB
#include <zlib.h>
#else
#define Z_OK 0
#define Z_ERRNO -1
#endif

#ifdef HAVE_PUFF
#include "puff.h"
#endif

// If you don't have stdint.h, the following two lines should work for most 32/64 bit systems
// typedef unsigned int uint32_t;
// typedef unsigned short uint16_t;

#define JZHOUR(t) ((t)>>11)
#define JZMINUTE(t) (((t)>>5) & 63)
#define JZSECOND(t) (((t) & 31) * 2)
#define JZTIME(h,m,s) (((h)<<11) + ((m)<<5) + (s)/2)

#define JZYEAR(t) (((t)>>9) + 1980)
#define JZMONTH(t) (((t)>>5) & 15)
#define JZDAY(t) ((t) & 31)
#define JZDATE(y,m,d) ((((y)-1980)<<9) + ((m)<<5) + (d))

typedef struct JZFile JZFile;

struct JZFile {
    size_t (*read)(JZFile *file, void *buf, size_t size);
    size_t (*tell)(JZFile *file);
    int (*seek)(JZFile *file, size_t offset, int whence);
    int (*error)(JZFile *file);
    void (*close)(JZFile *file);
};

JZFile *
jzfile_from_stdio_file(FILE *fp);

typedef struct __attribute__ ((__packed__)) {
    uint32_t signature; // 0x04034B50
    uint16_t versionNeededToExtract; // unsupported
    uint16_t generalPurposeBitFlag; // unsupported
    uint16_t compressionMethod;
    uint16_t lastModFileTime;
    uint16_t lastModFileDate;
    uint32_t crc32;
    uint32_t compressedSize;
    uint32_t uncompressedSize;
    uint16_t fileNameLength;
    uint16_t extraFieldLength; // unsupported
} JZLocalFileHeader;

typedef struct __attribute__ ((__packed__)) {
    uint32_t signature; // 0x02014B50
    uint16_t versionMadeBy; // unsupported
    uint16_t versionNeededToExtract; // unsupported
    uint16_t generalPurposeBitFlag; // unsupported
    uint16_t compressionMethod;
    uint16_t lastModFileTime;
    uint16_t lastModFileDate;
    uint32_t crc32;
    uint32_t compressedSize;
    uint32_t uncompressedSize;
    uint16_t fileNameLength;
    uint16_t extraFieldLength; // unsupported
    uint16_t fileCommentLength; // unsupported
    uint16_t diskNumberStart; // unsupported
    uint16_t internalFileAttributes; // unsupported
    uint32_t externalFileAttributes; // unsupported
    uint32_t relativeOffsetOflocalHeader;
} JZGlobalFileHeader;

typedef struct __attribute__ ((__packed__)) {
    uint16_t compressionMethod;
    uint16_t lastModFileTime;
    uint16_t lastModFileDate;
    uint32_t crc32;
    uint32_t compressedSize;
    uint32_t uncompressedSize;
    uint32_t offset;
} JZFileHeader;

typedef struct __attribute__ ((__packed__)) {
    uint32_t signature; // 0x06054b50
    uint16_t diskNumber; // unsupported
    uint16_t centralDirectoryDiskNumber; // unsupported
    uint16_t numEntriesThisDisk; // unsupported
    uint16_t numEntries;
    uint32_t centralDirectorySize;
    uint32_t centralDirectoryOffset;
    uint16_t zipCommentLength;
    // Followed by .ZIP file comment (variable size)
} JZEndRecord;

// Callback prototype for central and local file record reading functions
typedef int (*JZRecordCallback)(JZFile *zip, int index, JZFileHeader *header,
        char *filename, void *user_data);

#define JZ_BUFFER_SIZE 65536

// Read ZIP file end record. Will move within file.
int jzReadEndRecord(JZFile *zip, JZEndRecord *endRecord);

// Read ZIP file global directory. Will move within file.
// Callback is called for each record, until callback returns zero
int jzReadCentralDirectory(JZFile *zip, JZEndRecord *endRecord,
        JZRecordCallback callback, void *user_data);

// Read local ZIP file header. Silent on errors so optimistic reading possible.
int jzReadLocalFileHeader(JZFile *zip, JZFileHeader *header,
        char *filename, int len);

// Same as above but returns the full raw header
int jzReadLocalFileHeaderRaw(JZFile *zip, JZLocalFileHeader *header,
        char *filename, int len);

// Read data from file stream, described by header, to preallocated buffer
// Return value is zlib coded, e.g. Z_OK, or error code
int jzReadData(JZFile *zip, JZFileHeader *header, void *buffer);

#ifdef __cplusplus
};
#endif /* __cplusplus */

#endif