junzip.h

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#ifndef __JUNZIP_H
#define __JUNZIP_H

#define Z_ERRNO 1
#define Z_OK 0


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

#include "deflate_tinfl.h"
#include <stdint.h>

    typedef struct
    {
        char *file;
        unsigned char *data;
        int size;
    } userdata_t;

    // 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;

    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);
#pragma pack(push)
#pragma pack(1)
    typedef struct {
        uint32_t signature;
        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 {
        uint32_t signature;
        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 {
        uint16_t compressionMethod;
        uint16_t lastModFileTime;
        uint16_t lastModFileDate;
        uint32_t crc32;
        uint32_t compressedSize;
        uint32_t uncompressedSize;
        uint32_t offset;
    } JZFileHeader;

    typedef struct {
        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;
#pragma pack(pop)

    // 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);

    // 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