/* simple-object-common.h -- common structs for object file manipulation.
  Copyright (C) 2010-2024 Free Software Foundation, Inc.

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If not,
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA.  */

/* Forward reference.  */
struct simple_object_functions;

/* An object file opened for reading.  */

struct simple_object_read_struct
{
 /* The file descriptor.  */
 int descriptor;
 /* The offset within the file.  */
 off_t offset;
 /* The functions which do the actual work.  */
 const struct simple_object_functions *functions;
 /* Private data for the object file format.  */
 void *data;
};

/* Object file attributes.  */

struct simple_object_attributes_struct
{
 /* The functions which do the actual work.  */
 const struct simple_object_functions *functions;
 /* Private data for the object file format.  */
 void *data;
};

/* An object file being created.  */

struct simple_object_write_struct
{
 /* The functions which do the actual work.  */
 const struct simple_object_functions *functions;
 /* The segment_name argument from the user.  */
 char *segment_name;
 /* The start of the list of sections.  */
 simple_object_write_section *sections;
 /* The last entry in the list of sections.  */
 simple_object_write_section *last_section;
 /* Private data for the object file format.  */
 void *data;
};

/* A section in an object file being created.  */

struct simple_object_write_section_struct
{
 /* Next in the list of sections attached to an
    simple_object_write.  */
 simple_object_write_section *next;
 /* The name of this section.  */
 char *name;
 /* The required alignment.  */
 unsigned int align;
 /* The first data attached to this section.  */
 struct simple_object_write_section_buffer *buffers;
 /* The last data attached to this section.  */
 struct simple_object_write_section_buffer *last_buffer;
};

/* Data attached to a section.  */

struct simple_object_write_section_buffer
{
 /* The next data for this section.  */
 struct simple_object_write_section_buffer *next;
 /* The size of the buffer.  */
 size_t size;
 /* The actual bytes.  */
 const void *buffer;
 /* A buffer to free, or NULL.  */
 void *free_buffer;
};

/* The number of bytes we read from the start of the file to pass to
  the match function.  */
#define SIMPLE_OBJECT_MATCH_HEADER_LEN (16)

/* Format-specific object file functions.  */

struct simple_object_functions
{
 /* If this file matches these functions, return a new value for the
    private data for an simple_object_read.  HEADER is the first 16
    bytes of the file.  DESCRIPTOR, OFFSET, SEGMENT_NAME, ERRMSG, and
    ERR are as for simple_object_open_read.  If this file does not
    match, this function should return NULL with *ERRMSG set to
    NULL.  */
 void *(*match) (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
                 int descriptor, off_t offset, const char *segment_name,
                 const char **errmsg, int *err);

 /* Implement simple_object_find_sections.  */
 const char *(*find_sections) (simple_object_read *,
                               int (*pfn) (void *, const char *,
                                           off_t offset, off_t length),
                               void *data,
                               int *err);

 /* Return the private data for the attributes for SOBJ.  */
 void *(*fetch_attributes) (simple_object_read *sobj, const char **errmsg,
                            int *err);

 /* Release the private data for an simple_object_read.  */
 void (*release_read) (void *);

 /* Merge the private data for the attributes of two files.  If they
    could be linked together, return NULL.  Otherwise return an error
    message.  */
 const char *(*attributes_merge) (void *, void *, int *err);

 /* Release the private data for an simple_object_attributes.  */
 void (*release_attributes) (void *);

 /* Start creating an object file.  */
 void *(*start_write) (void *attributes_data, const char **errmsg,
                       int *err);

 /* Write the complete object file.  */
 const char *(*write_to_file) (simple_object_write *sobj, int descriptor,
                               int *err);

 /* Release the private data for an simple_object_write.  */
 void (*release_write) (void *);

 /* Copy LTO debug sections.  */
 const char *(*copy_lto_debug_sections) (simple_object_read *sobj,
                                         simple_object_write *dobj,
                                         char *(*pfn) (const char *),
                                         int *err);
};

/* The known object file formats.  */

extern const struct simple_object_functions simple_object_coff_functions;
extern const struct simple_object_functions simple_object_elf_functions;
extern const struct simple_object_functions simple_object_mach_o_functions;
extern const struct simple_object_functions simple_object_xcoff_functions;

/* Read SIZE bytes from DESCRIPTOR at file offset OFFSET into BUFFER.
  Return non-zero on success.  On failure return 0 and set *ERRMSG
  and *ERR.  */

extern int
simple_object_internal_read (int descriptor, off_t offset,
                            unsigned char *buffer, size_t size,
                            const char **errmsg, int *err);

/* Write SIZE bytes from BUFFER to DESCRIPTOR at file offset OFFSET.
  Return non-zero on success.  On failure return 0 and set *ERRMSG
  and *ERR.  */

extern int
simple_object_internal_write (int descriptor, off_t offset,
                             const unsigned char *buffer, size_t size,
                             const char **errmsg, int *err);

/* Define ulong_type as an unsigned 64-bit type if available.
  Otherwise just make it unsigned long.  */

#ifdef UNSIGNED_64BIT_TYPE
__extension__ typedef UNSIGNED_64BIT_TYPE ulong_type;
#else
typedef unsigned long ulong_type;
#endif

/* Fetch a big-endian 16-bit value.  */

static inline unsigned short
simple_object_fetch_big_16 (const unsigned char *buf)
{
 return ((unsigned short) buf[0] << 8) | (unsigned short) buf[1];
}

/* Fetch a little-endian 16-bit value.  */

static inline unsigned short
simple_object_fetch_little_16 (const unsigned char *buf)
{
 return ((unsigned short) buf[1] << 8) | (unsigned short) buf[0];
}

/* Fetch a big-endian 32-bit value.  */

static inline unsigned int
simple_object_fetch_big_32 (const unsigned char *buf)
{
 return (((unsigned int) buf[0] << 24)
         | ((unsigned int) buf[1] << 16)
         | ((unsigned int) buf[2] << 8)
         | (unsigned int) buf[3]);
}

/* Fetch a little-endian 32-bit value.  */

static inline unsigned int
simple_object_fetch_little_32 (const unsigned char *buf)
{
 return (((unsigned int) buf[3] << 24)
         | ((unsigned int) buf[2] << 16)
         | ((unsigned int) buf[1] << 8)
         | (unsigned int) buf[0]);
}

/* Fetch a big-endian 32-bit value as a ulong_type.  */

static inline ulong_type
simple_object_fetch_big_32_ulong (const unsigned char *buf)
{
 return (ulong_type) simple_object_fetch_big_32 (buf);
}

/* Fetch a little-endian 32-bit value as a ulong_type.  */

static inline ulong_type
simple_object_fetch_little_32_ulong (const unsigned char *buf)
{
 return (ulong_type) simple_object_fetch_little_32 (buf);
}

#ifdef UNSIGNED_64BIT_TYPE

/* Fetch a big-endian 64-bit value.  */

static inline ulong_type
simple_object_fetch_big_64 (const unsigned char *buf)
{
 return (((ulong_type) buf[0] << 56)
         | ((ulong_type) buf[1] << 48)
         | ((ulong_type) buf[2] << 40)
         | ((ulong_type) buf[3] << 32)
         | ((ulong_type) buf[4] << 24)
         | ((ulong_type) buf[5] << 16)
         | ((ulong_type) buf[6] << 8)
         | (ulong_type) buf[7]);
}

/* Fetch a little-endian 64-bit value.  */

static inline ulong_type
simple_object_fetch_little_64 (const unsigned char *buf)
{
 return (((ulong_type) buf[7] << 56)
         | ((ulong_type) buf[6] << 48)
         | ((ulong_type) buf[5] << 40)
         | ((ulong_type) buf[4] << 32)
         | ((ulong_type) buf[3] << 24)
         | ((ulong_type) buf[2] << 16)
         | ((ulong_type) buf[1] << 8)
         | (ulong_type) buf[0]);
}

#endif

/* Store a big-endian 16-bit value.  */

static inline void
simple_object_set_big_16 (unsigned char *buf, unsigned short val)
{
 buf[0] = (val >> 8) & 0xff;
 buf[1] = val & 0xff;
}

/* Store a little-endian 16-bit value.  */

static inline void
simple_object_set_little_16 (unsigned char *buf, unsigned short val)
{
 buf[1] = (val >> 8) & 0xff;
 buf[0] = val & 0xff;
}

/* Store a big-endian 32-bit value.  */

static inline void
simple_object_set_big_32 (unsigned char *buf, unsigned int val)
{
 buf[0] = (val >> 24) & 0xff;
 buf[1] = (val >> 16) & 0xff;
 buf[2] = (val >> 8) & 0xff;
 buf[3] = val & 0xff;
}

/* Store a little-endian 32-bit value.  */

static inline void
simple_object_set_little_32 (unsigned char *buf, unsigned int val)
{
 buf[3] = (val >> 24) & 0xff;
 buf[2] = (val >> 16) & 0xff;
 buf[1] = (val >> 8) & 0xff;
 buf[0] = val & 0xff;
}

/* Store a big-endian 32-bit value coming in as a ulong_type.  */

static inline void
simple_object_set_big_32_ulong (unsigned char *buf, ulong_type val)
{
 simple_object_set_big_32 (buf, val);
}

/* Store a little-endian 32-bit value coming in as a ulong_type.  */

static inline void
simple_object_set_little_32_ulong (unsigned char *buf, ulong_type val)
{
 simple_object_set_little_32 (buf, val);
}

#ifdef UNSIGNED_64BIT_TYPE

/* Store a big-endian 64-bit value.  */

static inline void
simple_object_set_big_64 (unsigned char *buf, ulong_type val)
{
 buf[0] = (val >> 56) & 0xff;
 buf[1] = (val >> 48) & 0xff;
 buf[2] = (val >> 40) & 0xff;
 buf[3] = (val >> 32) & 0xff;
 buf[4] = (val >> 24) & 0xff;
 buf[5] = (val >> 16) & 0xff;
 buf[6] = (val >> 8) & 0xff;
 buf[7] = val & 0xff;
}

/* Store a little-endian 64-bit value.  */

static inline void
simple_object_set_little_64 (unsigned char *buf, ulong_type val)
{
 buf[7] = (val >> 56) & 0xff;
 buf[6] = (val >> 48) & 0xff;
 buf[5] = (val >> 40) & 0xff;
 buf[4] = (val >> 32) & 0xff;
 buf[3] = (val >> 24) & 0xff;
 buf[2] = (val >> 16) & 0xff;
 buf[1] = (val >> 8) & 0xff;
 buf[0] = val & 0xff;
}

#endif

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