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Pillow/src/libImaging/TgaRleDecode.c
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| /* | |
| * The Python Imaging Library. | |
| * $Id$ | |
| * | |
| * decoder for Targa RLE data. | |
| * | |
| * history: | |
| * 97-01-04 fl created | |
| * 98-09-11 fl don't one byte per pixel; take orientation into account | |
| * | |
| * Copyright (c) Fredrik Lundh 1997. | |
| * Copyright (c) Secret Labs AB 1997-98. | |
| * | |
| * See the README file for information on usage and redistribution. | |
| */ | |
| #include "Imaging.h" | |
| int | |
| ImagingTgaRleDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t bytes) { | |
| int n, depth; | |
| UINT8 *ptr; | |
| int extra_bytes = 0; | |
| ptr = buf; | |
| if (state->state == 0) { | |
| /* check image orientation */ | |
| if (state->ystep < 0) { | |
| state->y = state->ysize - 1; | |
| state->ystep = -1; | |
| } else { | |
| state->ystep = 1; | |
| } | |
| state->state = 1; | |
| } | |
| depth = state->count; | |
| for (;;) { | |
| if (bytes < 1) { | |
| return ptr - buf; | |
| } | |
| n = depth * ((ptr[0] & 0x7f) + 1); | |
| if (ptr[0] & 0x80) { | |
| /* Run (1 + pixelsize bytes) */ | |
| if (bytes < 1 + depth) { | |
| break; | |
| } | |
| if (state->x + n > state->bytes) { | |
| state->errcode = IMAGING_CODEC_OVERRUN; | |
| return -1; | |
| } | |
| if (depth == 1) { | |
| memset(state->buffer + state->x, ptr[1], n); | |
| } else { | |
| int i; | |
| for (i = 0; i < n; i += depth) { | |
| memcpy(state->buffer + state->x + i, ptr + 1, depth); | |
| } | |
| } | |
| ptr += 1 + depth; | |
| bytes -= 1 + depth; | |
| } else { | |
| /* Literal (1+n+1 bytes block) */ | |
| if (bytes < 1 + n) { | |
| break; | |
| } | |
| if (state->x + n > state->bytes) { | |
| extra_bytes = n; /* full value */ | |
| n = state->bytes - state->x; | |
| extra_bytes -= n; | |
| } | |
| memcpy(state->buffer + state->x, ptr + 1, n); | |
| ptr += 1 + n; | |
| bytes -= 1 + n; | |
| } | |
| for (;;) { | |
| state->x += n; | |
| if (state->x >= state->bytes) { | |
| /* Got a full line, unpack it */ | |
| state->shuffle( | |
| (UINT8 *)im->image[state->y + state->yoff] + | |
| state->xoff * im->pixelsize, | |
| state->buffer, | |
| state->xsize); | |
| state->x = 0; | |
| state->y += state->ystep; | |
| if (state->y < 0 || state->y >= state->ysize) { | |
| /* End of file (errcode = 0) */ | |
| return -1; | |
| } | |
| } | |
| if (extra_bytes == 0) { | |
| break; | |
| } | |
| if (state->x > 0) { | |
| break; // assert | |
| } | |
| if (extra_bytes >= state->bytes) { | |
| n = state->bytes; | |
| } else { | |
| n = extra_bytes; | |
| } | |
| memcpy(state->buffer + state->x, ptr, n); | |
| ptr += n; | |
| bytes -= n; | |
| extra_bytes -= n; | |
| } | |
| } | |
| return ptr - buf; | |
| } |